JP6904166B2 - Switching method, IP retransmission system, IP retransmission device and control device - Google Patents

Description

The present invention relates to a switching method, an IP retransmission system, an IP retransmission device and a control device.

With the improvement of digital technology in recent years, services that apply digital technology to television broadcasting and the like to provide more programs are provided. High-efficiency compression and multiplexing techniques are used to provide more programs with high image quality and high sound quality using a limited transmission band.

As an example of such a digital broadcasting system, for example, Japanese Patent Application Laid-Open No. 2010-171799 (Patent Document 1) discloses the following configuration. That is, the remultiplexing system receives a digital broadcast wave, demodulates it, and outputs an MPEG-2 TS (Transport Stream), and an MPEG-2 TS is input from the demodulator to output a multi-channel MPEG-2 video. With multiple video transcoders that execute transcoding on each target and output the transcoded video, audio and subtitles in the digital broadcast signal, and PCR (Program Lock Reference) in multiplex in MPEG-2 TS format. A remultiplier that remultiplexes the transcoder output signals of the plurality of video transcoders and the MPEG-2 TS output of the demodulator. The remultiplexing device receives each of the transcoder output signals from the plurality of video transcoders, extracts the TS packet of MPEG-2 TS in the received signal, and writes the TS packet to the signal buffer area of the signal storage means. Receives the MPEG-2 TS output from the transcoder output signal receiving means of the above and the demodulator, extracts the TS packet of the MPEG-2 TS in the received signal, and writes it to the signal buffer area of the signal storage means. The signal receiving means, the PCR in the TS packet of the MPEG-2 TS written in the signal storage means by the plurality of transcoder output signal receiving means, and the MPEG-2 TS written in the signal storage means by the broadcast signal receiving means. Time stamp value for determining the multiple timing of the MPEG-2 TS TS packet received from the video transcoder and the MPEG-2 TS TS packet received from the demodulator based on the PCR in the TS packet of Is obtained for each TS packet, and the time stamp value is written together with each TS packet in the signal storage means. Multiple timing control means and multiplexing determined according to the size of the time stamp value stored in the signal storage means. At the timing, the TS packet in the signal storage means is read out, and the transcoder output signal and the digital broadcast signal are remultiplexed and output.

JP-A-2010-171799

In the station building of a digital broadcasting distributor such as cable TV, a plurality of operational and backup distribution devices are often provided.

Here, when the output of the distribution device is stopped for maintenance and replacement of the distribution device of the operation system and the distribution is switched to the distribution device of the backup system, it is desired to reproduce the content satisfactorily.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is an IP, a switching method capable of realizing stable content reproduction in a playback device in a configuration in which a content transmission device can be switched. It is to provide a retransmission system, an IP retransmission device and a control device.

(1) In order to solve the above problems, the switching method according to a certain aspect of the present invention is a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave in an IP packet. This is a method of switching the retransmission of the content from the IP retransmission device of the operating system to the IP retransmission device of the standby system in the IP retransmission system including the above, and is received by the IP retransmission device of the operating system. The step of matching the frequency of the broadcast wave received by the standby system IP retransmission device to the frequency of the broadcast wave, and the output from each of the operation system IP retransmission device and the standby system IP retransmission device. Switching between the step of matching the original internal state and the internal state in which individual differences occur and the retransmission of the content from the active IP retransmission device to the standby IP retransmission device at a predetermined timing. Including steps.

(4) In order to solve the above problems, the switching method according to a certain aspect of the present invention is a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave in an IP packet. This is a method of switching the retransmission of the content from the IP retransmission device of the operating system to the IP retransmission device of the standby system in the IP retransmission system including the above, and is received by the IP retransmission device of the operating system. Timing related to the step of matching the frequency of the broadcast wave received by the standby system IP retransmission device to the frequency of the broadcast wave, and the processing timing in the content reproduction device generated by the operation system IP retransmission device. A step of giving information to the standby system IP retransmission device, a step of switching the retransmission of the content from the operation system IP retransmission device to the standby system IP retransmission device at a predetermined timing, and a switching destination. The IP retransmission device includes a step of including the processing timing based on the given timing information in the IP packet and transmitting the IP packet.

(6) In order to solve the above problems, the IP retransmission system according to a certain aspect of the present invention receives the same broadcast wave from the distributor, includes the content included in the broadcast wave in the IP packet, and retransmits it. An IP retransmission system including a plurality of IP retransmission devices, in which the IP packets output from each of the IP retransmission devices are relayed by the relay device and transmitted to the network, and the standby system IP retransmission device. Matches the frequency of the received broadcast wave to the frequency of the broadcast wave received by the IP retransmission device of the operating system, and the IP retransmission system further adjusts the IP retransmission device of the operating system and the standby. The IP retransmission device of the operation system is used to switch between the matching unit that matches the internal state that is the source of output from each of the IP retransmission devices of the system and causes individual differences, and the retransmission of the content. Is provided with a switching unit that stops the retransmission of the content at a predetermined timing and causes the standby system IP retransmission device to start the retransmission of the content at a predetermined timing.

(7) In order to solve the above problems, the IP retransmission system according to a certain aspect of the present invention receives the same broadcast wave from the distributor, includes the content included in the broadcast wave in the IP packet, and retransmits it. A plurality of IP retransmission devices and a control device are provided, and the IP packet output from each of the IP retransmission devices is relayed by the relay device and transmitted to the network, and the standby system IP retransmission device is used. The frequency of the broadcast wave to be received is matched with the frequency of the broadcast wave received by the IP retransmission device of the operating system, and the IP retransmission device of the standby system is generated by the IP retransmission device of the operating system. , The timing information regarding the processing timing in the content reproduction device is acquired via the control device, and the control device switches the content retransmission to the operation system IP retransmission device at a predetermined timing. The content retransmission is stopped, the standby IP retransmission device is started to retransmit the content at a predetermined timing, and the switching destination IP retransmission device performs the processing based on the given timing information. The timing is included in the IP packet and transmitted.

(8) In order to solve the above problems, the IP retransmission device according to a certain aspect of the present invention receives a broadcast wave and includes a content included in the broadcast wave in an IP packet and retransmits a plurality of IP retransmissions. The IP retransmission device in an IP retransmission system including a transmission device, which is an internal state that is an internal state that is a source of output from each of the IP retransmission device in the active system and the IP retransmission device in the standby system. It includes a processing unit that performs processing for matching the internal states that cause a difference, and an output unit that outputs the IP packet.

(9) In order to solve the above problems, the IP retransmission device according to a certain aspect of the present invention is an IP retransmission system that receives a broadcast wave and retransmits the content contained in the broadcast wave by including it in an IP packet. The IP retransmission device in the above, the timing information generation unit that generates timing information regarding the processing timing in the content reproduction device, and the timing information generated by the timing information generation unit to the other IP retransmission device. Generates the IP packet including the notification unit for notifying, the acquisition unit for acquiring the timing information notified from the other IP retransmission device, and the processing timing based on the timing information acquired by the acquisition unit. It is provided with a packet processing unit for transmitting.

(10) In order to solve the above problems, the control device according to a certain aspect of the present invention is a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave by including it in an IP packet. It is a control device in the IP retransmission system including the above, and the frequency of the broadcast wave received by the IP retransmission device of the standby system is set to the frequency of the broadcast wave received by the IP retransmission device of the operation system. A broadcast wave command unit that notifies an instruction to match with, an acquisition unit that acquires timing information regarding processing timing in the content reproduction device generated by the IP retransmission device of the operation system, and an acquisition unit acquired by the acquisition unit. The information giving unit that gives the timing information to the standby system IP retransmission device and the operation system IP retransmission device stop the retransmission of the content at a predetermined timing, and the standby system IP retransmission device stops the retransmission of the content at a predetermined timing. The IP retransmission device includes a switching command unit for notifying an instruction to start retransmission of the content.

The present invention can be realized not only as an IP retransmission system provided with such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes a part or all of the IP retransmission system.

The present invention can be realized not only as an IP retransmission device provided with such a characteristic processing unit, but also as a method in which such characteristic processing is a step. Further, the present invention can be realized not only as an IP retransmission device provided with such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes a part or all of the IP retransmission device.

The present invention can be realized not only as a control device provided with such a characteristic processing unit, but also as a method in which such characteristic processing is a step. Further, the present invention can be realized not only as a control device provided with such a characteristic processing unit, but also as a semiconductor integrated circuit that realizes a part or all of the control device.

According to the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

FIG. 1 is a diagram showing a configuration of an IP retransmission system according to the first embodiment of the present invention. FIG. 2 is a diagram showing a configuration of an IP retransmission device in the IP retransmission system according to the first embodiment of the present invention. FIG. 3 is a diagram showing a process at the time of switching the IP retransmission device by the IP retransmission system according to the first embodiment of the present invention. FIG. 4 is a diagram showing an example of a sequence of switching processing of the IP retransmission device by the IP retransmission system according to the first embodiment of the present invention. FIG. 5 is a diagram showing a configuration of a control device in the IP retransmission system according to the first embodiment of the present invention. FIG. 6 is a diagram showing a configuration of a modified example of the IP retransmission device in the IP retransmission system according to the first embodiment of the present invention. FIG. 7 is a diagram showing a configuration of an IP retransmission system according to a second embodiment of the present invention. FIG. 8 is a diagram showing an example of packet transmission in the IP retransmission system according to the second embodiment of the present invention. FIG. 9 is a diagram showing the configuration of another example of the IP retransmission device in the IP retransmission system according to the second embodiment of the present invention. FIG. 10 is a diagram showing another example of packet transmission in the IP retransmission system according to the second embodiment of the present invention.

First, the contents of the embodiments of the present invention will be listed and described.

(1) The switching method according to the embodiment of the present invention is in an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave in an IP packet. , A method of switching the retransmission of the content from the IP retransmission device of the operating system to the IP retransmission device of the standby system, in which the frequency of the broadcast wave received by the IP retransmission device of the operating system is used. The step of matching the frequency of the broadcast wave received by the standby system IP retransmission device and the internal state that is the source of output from each of the operation system IP retransmission device and the standby system IP retransmission device. This includes a step of matching the internal states in which individual differences occur, and a step of switching the retransmission of the content from the operating system IP retransmission device to the standby system IP retransmission device at a predetermined timing.

By such a method, individual differences between the active IP retransmission device and the standby IP retransmission device can be absorbed, and the internal state that is the source of the output from each device can be matched. Therefore, for example, reproduction can be performed. In the device, it is possible to stably process the IP packet transmitted from the switching destination IP retransmission device, reproduce the content well, and prevent false detection of abnormalities by other devices due to switching. Become. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(2) Preferably, the reference timing information included in the broadcast wave is acquired by each of the IP retransmission devices, and the IP retransmission device includes the reference timing information in the IP packet and retransmits the information. The internal state is the output timing of the reference timing information from the IP retransmission device.

In this way, by matching the transmission timing of the reference timing as the internal state between the IP retransmission devices, it is possible to prevent erroneous detection of an abnormality by another device due to switching, for example.

(3) Preferably, the IP retransmission device transmits the content including the processing timing in the playback device in the IP packet, and the internal state is a count value of the processing timing.

In this way, by matching the count value of the processing timing in the playback device as the internal state between the IP retransmission devices, the playback device stably processes the IP packet transmitted from the switching destination IP retransmission device. However, the content can be reproduced well.

(4) The switching method according to the embodiment of the present invention is in an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave in an IP packet. , A method of switching the retransmission of the content from the IP retransmission device of the operating system to the IP retransmission device of the standby system, in which the frequency of the broadcast wave received by the IP retransmission device of the operating system is used. The IP of the standby system contains timing information regarding the step of matching the frequency of the broadcast wave received by the IP retransmission device of the standby system and the processing timing of the content reproduction device generated by the IP retransmission device of the operation system. A step of giving to the retransmission device, a step of switching the retransmission of the content from the operating system IP retransmission device to the standby system IP retransmission device at a predetermined timing, and a step of switching the switching destination IP retransmission device. , The step of including the processing timing based on the given timing information in the IP packet and transmitting the IP packet.

By such a method, compared to the case where the output stop timing of the active IP retransmission device and the output start timing of the standby IP retransmission device are simply switched at the same time, the switching destination IP reset in the playback device is performed. It is possible to stably process the IP packet transmitted from the transmitting device and reproduce the content satisfactorily. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(5) Preferably, the reference timing information included in the broadcast wave is acquired in each of the IP retransmission devices, and the timing information is generated in the operational IP retransmission device based on the reference timing. ..

In this way, the time information of the active IP retransmission device and the standby IP retransmission device are calculated by the method of calculating the timing information based on the reference timing included in the broadcast wave and acquired by each IP retransmission device. The time information can be easily adjusted. Further, it is possible to avoid the influence of the transmission delay of the timing information from the active IP retransmission device to the standby IP retransmission device.

(6) The IP retransmission system according to the embodiment of the present invention includes a plurality of IP retransmission devices that receive the same broadcast wave from the distributor and retransmit the content included in the broadcast wave in an IP packet. An IP retransmission system including, the IP packet output from each IP retransmission device is relayed by a relay device and transmitted to a network, and the standby system IP retransmission device receives broadcast waves. The frequency is matched to the frequency of the broadcast wave received by the IP retransmission device of the operating system, and the IP retransmission system further comprises the IP retransmission device of the operating system and the IP retransmission device of the standby system. The content is switched to the matching unit that matches the internal state that is the source of the output from each and causes individual differences, and the content is retransmitted to the operating system IP retransmission device at a predetermined timing. The standby system IP retransmission device is provided with a switching unit for stopping the retransmission of the content and starting the retransmission of the content at a predetermined timing.

With such a configuration, individual differences between the active IP retransmission device and the standby IP retransmission device can be absorbed, and the internal state that is the source of the output from each device can be matched. Therefore, for example, reproduction is possible. In the device, it is possible to stably process the IP packet transmitted from the switching destination IP retransmission device, reproduce the content well, and prevent false detection of abnormalities by other devices due to switching. Become. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(7) The IP retransmission system according to the embodiment of the present invention includes a plurality of IP retransmission devices that receive the same broadcast wave from the distributor and retransmit the content included in the broadcast wave in an IP packet. The IP packet output from each of the IP retransmission devices is relayed by the relay device and transmitted to the network, and the standby system IP retransmission device determines the frequency of the broadcast wave to be received. In accordance with the frequency of the broadcast wave received by the operating system IP retransmission device, the standby system IP retransmission device is generated in the operating system IP retransmission device in the content reproduction device. Timing information regarding the processing timing is acquired via the control device, and the control device causes the IP retransmission device of the operating system to stop the retransmission of the content at a predetermined timing as a switching of the retransmission of the content. , The standby system IP retransmission device is started to retransmit the content at a predetermined timing, and the switching destination IP retransmission device includes the processing timing based on the given timing information in the IP packet. And send.

With such a configuration, in the playback device, the switching destination IP resetting is compared with the case where the output stop timing of the active IP retransmission device and the output start timing of the standby IP retransmission device are simply switched. It is possible to stably process the IP packet transmitted from the transmitting device and reproduce the content satisfactorily. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(8) The IP retransmission device according to the embodiment of the present invention includes a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave in an IP packet. The IP retransmission device in the system, which is the internal state that is the source of output from each of the IP retransmission device in the active system and the IP retransmission device in the standby system, and the internal states that cause individual differences are matched. It includes a processing unit that performs processing for causing the IP packet to be generated, and an output unit that outputs the IP packet.

With such a configuration, individual differences between the active IP retransmission device and the standby IP retransmission device can be absorbed, and the internal state that is the source of the output from each device can be matched. Therefore, for example, reproduction is possible. In the device, it is possible to stably process the IP packet transmitted from the switching destination IP retransmission device, reproduce the content well, and prevent false detection of abnormalities by other devices due to switching. Become. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(9) The IP retransmission device according to the embodiment of the present invention is an IP retransmission device in an IP retransmission system that receives a broadcast wave and retransmits the content included in the broadcast wave by including it in an IP packet. A timing information generation unit that generates timing information regarding processing timing in the content playback device, a notification unit that notifies other IP retransmission devices of the timing information generated by the timing information generation unit, and the like. An acquisition unit that acquires the timing information notified from the IP retransmission device, and a packet processing unit that generates and transmits the IP packet including the processing timing based on the timing information acquired by the acquisition unit. To be equipped.

With such a configuration, in the playback device, the switching destination IP resetting is compared with the case where the output stop timing of the active IP retransmission device and the output start timing of the standby IP retransmission device are simply switched. It is possible to stably process the IP packet transmitted from the transmitting device and reproduce the content satisfactorily. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

(10) The control device according to the embodiment of the present invention is an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave by including it in an IP packet. A broadcast that notifies the IP retransmission device of the standby system of a command for adjusting the frequency of the received broadcast wave to the frequency of the broadcast wave received by the IP retransmission device of the operation system, which is a control device. The wave command unit, the acquisition unit that acquires the timing information regarding the processing timing in the content reproduction device generated by the IP retransmission device of the operation system, and the standby system that acquires the timing information acquired by the acquisition unit. The information giving unit given to the IP retransmission device of the above, the IP retransmission device of the operating system stops the retransmission of the content at a predetermined timing, and the IP retransmission device of the standby system stops the retransmission of the content at a predetermined timing. It is provided with a switching command unit for notifying a command to start re-transmission of.

With such a configuration, in the playback device, the switching destination IP resetting is compared with the case where the output stop timing of the active IP retransmission device and the output start timing of the standby IP retransmission device are simply switched. It is possible to stably process the IP packet transmitted from the transmitting device and reproduce the content satisfactorily. Therefore, in a configuration in which the content transmission device can be switched, stable content reproduction in the playback device can be realized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated. In addition, at least a part of the embodiments described below may be arbitrarily combined.

<First Embodiment>
[Constitution]
FIG. 1 is a diagram showing a configuration of an IP retransmission system according to the first embodiment of the present invention.

With reference to FIG. 1, the IP retransmission system 301 is described in, for example, MPEG2-TS (Moving Picture Experts Group 2 Transport Stream) and H.M. It is an IP retransmission system according to the 264 standard, and includes a plurality of IP retransmission devices 101, one or a plurality of control devices 151, a distributor 152, and L2 switches 153, 154, 155. The IP retransmission system 301 may be an IP retransmission system that conforms to other standards.

In FIG. 1, as an example, 15 IP retransmission devices 101 as an operation system, two IP retransmission devices 101 as a backup system, and two control devices 151 as an operation system and a backup system are provided. There is. The L2 switches 153, 154, and 155 are realized by one device or a plurality of devices.

The IP retransmission device 101 receives the broadcast wave, includes the content included in the received broadcast wave in the IP packet, and retransmits the content. More specifically, the distributor 152 distributes the broadcast signal received at the antenna to each IP retransmission device 101.

The IP retransmission device 101 extracts content information from the broadcast signal received from the distributor 152, and for example, divides and includes a plurality of IP packets containing the extracted content information via the L2 switch 155 and the IP network 401 for each IP-. Multicast to STB171. That is, the IP packet output from each IP retransmission device 101 is relayed by the L2 switch 155, which is an example of the relay device, and transmitted to the IP network 401. For example, the IP retransmission device 101 includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of IP packets and retransmits the contents.

The IP-STB171 is an example of a content reproduction device, which extracts content information from an IP packet received from the IP network 401 and reproduces the content information on the television device (TV) 172.

The IP retransmission device 101 transmits the SI information of the corresponding station to the SI (Service Information) server 161 of all stations via the L2 switch 153.

Further, the IP retransmission device 101 extracts emergency information such as an emergency alarm from the broadcast signal received from the distributor 152 and transmits it to the emergency alarm server 162 via the L2 switch 153.

The control device 151 sets and monitors the IP retransmission device 101 by transmitting and receiving information to and from the IP retransmission device 101 via the L2 switch 153.

The control device 151 acquires the key information from the key server 163 via the L2 switch 154 and gives it to each IP retransmission device 101 via the L2 switch 153.

FIG. 2 is a diagram showing a configuration of an IP retransmission device in the IP retransmission system according to the first embodiment of the present invention.

With reference to FIG. 2, the IP retransmission device 101 includes a tuner 11, a descramble unit 12, a transcoding unit 13, a multiplexing unit 14, and a TTS (Time stamped TS) processing unit (packet processing unit) 15. , A scramble unit 16, an IP conversion unit (output unit) 17, a control unit (timing information generation unit, notification unit and acquisition unit) 18, a counter 19, and a switch circuit 20.

The control unit 18 sets and monitors each unit in the IP retransmission device 101, and also transmits and receives various information to and from the control device 151.

The tuner 11 performs predetermined signal processing such as OFDM demodulation processing on the broadcast signal of the frequency specified by the control unit 18 among the broadcast signals received from the distributor 152, and the TS packet including video data and audio data. The multiplexed signal of the above is extracted, and the extracted multiplexed signal is output to the descramble unit 12.

The descramble unit 12 performs descramble processing on the multiplexed signal received from the tuner 11, outputs a TS packet including the processed video data to the transcoding unit 13, and also outputs the processed audio data or other data. The TS packet containing the above is output to the multiplexing unit 14.

The transcoding unit 13 transmits video data according to the MPEG2 standard included in the TS packet received from the descramble unit 12 to H.A. It transcodes to video data according to the 264 standard, and outputs a TS packet containing the transcoded video data to the multiplexing unit 14.

The multiplexing unit 14 multiplexes and outputs each TS packet received from the transcoding unit 13 and the descramble unit 12 in the time axis direction.

The TTS processing unit 15 creates a TTS packet by adding a header including a time stamp to each TS packet received from the multiplexing unit 14, and outputs the TTS packet to the scramble unit 16.

Here, the time stamp is an example of the processing timing in the content playback device. For example, the IP retransmission device 101 uses the count value of a counter that operates according to the timing of the self-propelled clock as the processing timing. This processing timing is the processing timing of the TS packet in the IP-STB171.

Specifically, the time stamp is the timing at which the TS packet should be input to the decoder in the IP-STB171, and is the count value of the counter 19 that operates according to the timing of the 27 MHz clock in the IP retransmission device 101, for example. The clock is asynchronous between each IP retransmission device 101.

By using the time stamp, the IP-STB171 can absorb fluctuations in the transmission time of each IP packet in the network, process the TS packet at an appropriate timing, and reproduce the content information satisfactorily.

The scramble unit 16 scrambles various information included in each TTS packet received from the TTS processing unit 15 by using the key information acquired from the control device 151 via the control unit 18, and scrambles the scrambled TTS packet. Output to the IP conversion unit 17.

The IP conversion unit 17 includes one or a plurality of TTS packets received from the scramble unit 16 in the IP packet and outputs the TTS packet to the L2 switch 155 via the switch circuit 20.

FIG. 3 is a diagram showing a process at the time of switching the IP retransmission device by the IP retransmission system according to the first embodiment of the present invention.

In the IP retransmission system 301, the matching unit matches the internal states that are the sources of output from each of the active IP retransmission device 101 and the standby IP retransmission device 101 and that cause individual differences. Let me. This matching unit corresponds to, for example, the control unit 18 and the TTS processing unit 15 in the IP retransmission device 101, and the acquisition unit 32 and the information giving unit 33 described later in the control device 151.

Further, the switching unit stops the retransmission of the content at a predetermined timing on the operating system IP retransmission device 101 as switching of the content retransmission, and causes the standby IP retransmission device 101 to stop the retransmission of the content at a predetermined timing. Start retransmission. This switching unit corresponds to, for example, the switching command unit 34 described later in the control device 151.

In the IP retransmission device 101, the processing unit matches the internal states that are the sources of output from each of the active system IP retransmission device 101 and the standby system IP retransmission device 101 and that cause individual differences. Perform the process to make it. This processing unit corresponds to, for example, the control unit 18 and the TTS processing unit 15 in the IP retransmission device 101.

For example, the internal state is a count value of the processing timing in the content reproduction device, specifically, a count value of the processing timing of the TS packet in the IP-STB171.

More specifically, with reference to FIGS. 2 and 3, the broadcast signal includes a PCR (Program Lock Reference) packet. The PCR packet is a TS packet containing PCR, which is an example of reference timing. PCR is a count value that follows the timing of the 27 MHz clock in the broadcast wave transmitter and is used to synchronize the clocks of the IP retransmission device 101 and IP-STB171 with the clock in the broadcast wave transmitter. PCR is acquired at each IP retransmission device 101.

The control unit 18 in the IP retransmission device 101 can generate timing information regarding the processing timing in the IP-STB171 and notify other IP retransmission devices 101. For example, the timing information is generated in the operating system IP retransmission device 101 based on the reference timing. More specifically, the control unit 18 generates timing information indicating the difference between the reference timing and the processing timing in its own IP retransmission device 101.

Specifically, the control unit 18 acquires, for example, PCR as a reference timing and a time stamp as a processing timing from the TTS processing unit 15, and calculates the difference Δt between the two. In this case, the timing information is the difference Δt with respect to the time stamp which is the processing timing.

For example, the control unit 18 has a logic circuit that continuously outputs the difference Δt. The control unit 18 transmits the calculated difference Δt to the control device 151. When the broadcast wave includes a plurality of types of PCR, the control unit 18 calculates the difference Δt for each PCR.

The control device 151 transmits the difference Δt received from the active system IP retransmission device 101 to the standby system IP retransmission device 101.

In the standby system IP retransmission device 101, the control unit 18 acquires the timing information notified from the operation system IP retransmission device 101.

The TTS processing unit 15 generates and transmits an IP packet including processing timing based on the timing information acquired by the control unit 18. For example, the control unit 18 sets the count value of the counter that operates according to the timing of the self-propelled clock as the processing timing, and corrects the processing timing based on the timing information.

More specifically, the control unit 18 corrects the count value of the counter 19, for example, by using the difference Δt received from the control device 151. Specifically, the control unit 18 sets the value obtained by adding the difference Δt to the PCR in the counter 19 as a preset value.

As a result, the TTS processing unit 15 adds the difference Δt notified from the control unit 18 to the count value that counts up according to the timing of the clock having the same speed as the PCR included in the PCR packet received from the multiplexing unit 14. Is used as a time stamp to create a TTS packet. That is, the time stamp value in the active system IP retransmission device 101 and the time stamp value in the standby system IP retransmission device 101 can be matched.

Here, the IP-STB171 includes a buffer for accumulating the received TTS packets, and can absorb fluctuations in the transmission delay of the IP packets in the IP network 401 or the like. Then, since the time stamp counter values of both the active system IP retransmission device 101 and the standby system IP retransmission device 101 change at substantially the same value, the IP-STB171 can be switched from the switching destination IP retransmission device 101. It is possible to stably process the transmitted TTS packet and reproduce the content satisfactorily.

Further, by adding the difference Δt to the PCR included in the broadcast signal distributed by the distributor 152, the difference from the active IP retransmission device 101 via the control device 151 to the standby IP retransmission device 101. The influence of the transmission delay of Δt can be avoided.

[Operation flow]
Next, the flow of the switching operation of the IP retransmission device in the IP retransmission system according to the first embodiment of the present invention will be described.

Each device in the IP retransmission system 301 includes a computer, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step in the following flowchart from a memory (not shown) and executes the program. The programs of these plurality of devices can be installed from the outside. The programs of these plurality of devices are distributed in a state of being stored in a recording medium.

FIG. 4 is a diagram showing an example of a sequence of switching processing of the IP retransmission device by the IP retransmission system according to the first embodiment of the present invention.

With reference to FIG. 4, in a situation where the IP retransmission device 101A and the IP retransmission device 101B, which are the IP retransmission devices 101, are the active system and the standby system, respectively, the control device 151 first determines the IP retransmission device 101A. An error is detected (step S1), and a standby instruction is transmitted to the IP retransmission device 101A (step S2).

The IP retransmission device 101A receives a standby instruction from the control device 151, stops transmitting IP packets, SI information, and an emergency alarm by, for example, turning off the switch circuit 20, and becomes a standby system (step S3).

Next, the control device 151 transmits the operation instruction to the IP retransmission device 101B (step S4).

Next, the IP retransmission device 101B receives an operation instruction from the control device 151, and adjusts the frequency of the received broadcast wave to the frequency of the broadcast wave received by the IP retransmission device 101A. Then, the IP retransmission device 101B starts transmitting IP packets, SI information, and an emergency alarm by turning on, for example, the switch circuit 20, and becomes an operating system (step S5).

Next, when the replacement or repair of the IP retransmission device 101A is completed, the control device 151 receives, for example, a switching instruction operated by an operator (step S6).

Next, the IP retransmission system 301 matches the internal states that are the sources of output from each of the active IP retransmission device 101 and the standby IP retransmission device 101 and that cause individual differences. ..

That is, first, the control device 151 transmits the timing information request to the IP retransmission device 101B. Here, when a plurality of types of PCR are included in the broadcast wave, the control device 151 includes the PID (Packet Identification) corresponding to the target PCR in the timing information request (step S7).

Next, the IP retransmission device 101B receives the timing information request from the control device 151, acquires the timing information, that is, the latest difference Δt, and transmits it to the control device 151 (step S8).

Next, the control device 151 transmits the timing information received from the IP retransmission device 101B to the IP retransmission device 101A. Here, when a plurality of types of PCR are included in the broadcast wave, the control device 151 transmits the PID corresponding to the target PCR to the IP retransmission device 101A together with the timing information (step S9).

Next, the standby system IP retransmission device 101A acquires information regarding the processing timing in the IP-STB 171 generated by the operation system IP retransmission device 101B via the control device 151. More specifically, the IP retransmission device 101A receives timing information from the control device 151, performs adjustment processing based on the received timing information, for example, corrects the count value of the counter 19 as described above (step S10). , ACK is transmitted to the control device 151 (step S11).

Next, the control device 151 switches the content retransmission from the active IP retransmission device 101B to the standby IP retransmission device 101A. That is, the control device 151 receives the ACK from the IP retransmission device 101A and notifies the IP retransmission device 101A and the IP retransmission device 101B of the predetermined switching timing. Specifically, the control device 151 notifies the IP retransmission device 101A and the IP retransmission device 101B of the time stamp value indicating the switching timing. Here, the control device 151 transmits a time stamp value to each IP retransmission device 101 when time adjustment is required between the transmission stop timing of the IP retransmission device 101A and the transmission start timing of the IP retransmission device 101B. May be adjusted to notify different timestamp values. That is, the predetermined timing may be different between the active system IP retransmission device 101 and the standby system IP retransmission device 101 (steps S12 and S14).

Next, when the IP retransmission device 101A and the IP retransmission device 101B receive the notification of the time stamp value from the control device 151, the IP retransmission device 101A and the IP retransmission device 101B transmit ACK to the control device 151 (steps S13 and S15).

Next, at a predetermined timing, that is, at the timing of the time stamp value notified from the control device 151, the IP retransmission device 101B stops transmitting the IP packet, SI information, and the emergency alarm, and becomes a standby system (step S16). ..

Further, at a predetermined timing, that is, at the timing of the time stamp value notified from the control device 151, the IP retransmission device 101A starts transmitting the IP packet, SI information, and the emergency alarm, and becomes an operation system. That is, the IP retransmission device 101A includes the processing timing based on the timing information notified from the control device 151 in the IP packet and transmits the IP packet. More specifically, the IP retransmission device 101A includes the difference Δt notified from the control device 151 and the time stamp based on PCR in the TTS packet and transmits the TTS packet (step S17).

Here, the IP retransmission system 301 is switched from the IP retransmission device 101A to the IP retransmission device 101B, and after the replacement or repair of the IP retransmission device 101A is completed, the IP retransmission of the operation system is performed. An example of performing timing matching processing such as transmission of the difference Δt and adjustment of the time stamp when the transmission device 101B is switched to the standby system IP retransmission device 101A has been shown, but the present invention is not limited to this.

The IP retransmission system 301 may be configured to perform the timing matching process when the active IP retransmission device 101 is switched to the standby IP retransmission device 101 at a predetermined timing. For example, the IP retransmission system 301 may be configured to perform the timing matching process. The timing matching process may be performed when the switching from the active IP retransmission device 101A in which an error is detected to the standby IP retransmission device 101B is performed at a predetermined timing.

Further, the control device 151 is not limited to the configuration in which the switching timing is specified by using the time stamp value, and may be specified by using PCR. However, the control device 151 more reliably grasps the timing in the IP retransmission device 101 and is more stable than the configuration using PCR transmitted by the broadcast wave by the configuration in which the switching timing is specified by using the time stamp. Can be switched.

FIG. 5 is a diagram showing a configuration of a control device in the IP retransmission system according to the first embodiment of the present invention.

With reference to FIG. 5, the control device 151 includes a broadcast wave command unit 31, an acquisition unit 32, an information addition unit 33, and a switching command unit 34.

The broadcast wave command unit 31 gives a command to the standby IP retransmission device 101 to match the frequency of the received broadcast wave with the frequency of the broadcast wave received by the active IP retransmission device 101, for example, the above-mentioned. Notify operation instructions.

The acquisition unit 32, for example, transmits the timing information request described above to generate timing information regarding the processing timing of the content reproduction device, for example, IP-STB171, which is generated by the IP retransmission device 101 of the operation system. To get.

The information giving unit 33 gives the timing information acquired by the acquiring unit 32 to the standby system IP retransmission device 101.

The switching instruction unit 34 is an instruction such that the active IP retransmission device 101 stops the content retransmission at a predetermined timing, and the standby IP retransmission device 101 starts the content retransmission at a predetermined timing, for example. Notify the above-mentioned switching timing. The predetermined timing is, for example, a timing designated by using the processing timing as described above.

FIG. 6 is a diagram showing a configuration of a modified example of the IP retransmission device in the IP retransmission system according to the first embodiment of the present invention.

In the modified example of the IP retransmission device 101, the reference timing included in the broadcast wave, for example, PCR information is included in the IP packet and retransmitted.

More specifically, with reference to FIG. 6, a modification of the IP retransmission device 101 further includes a counter 21 as compared to the IP retransmission device 101 shown in FIG.

The multiplexing unit 14 includes the PCR included in the PCR packet received from the descramble unit 12 in, for example, a TS packet containing video data at a predetermined cycle and outputs the PCR to the TTS processing unit 15. As a result, the amount of packet transmission can be reduced as compared with the configuration in which the PCR packet is output separately.

More specifically, the counter 21 operates according to the timing of a clock of 27 MHz, which is a self-propelled clock in the IP retransmission device 101, like the counter 19, for example. The counter 21 generates a pulse at a predetermined cycle and outputs the pulse to the multiplexing unit 14.

When the multiplexing unit 14 receives a pulse from the counter 21, the multiplexing unit 14 includes the latest PCR in the TS packet and outputs it to the TTS processing unit 15.

The multiplexing unit 14 may include the PCR in, for example, a TS packet containing voice data and output it at a predetermined cycle, or may output the PCR packet itself at a predetermined cycle.

By the way, in a broadcasting system provided with a plurality of distribution devices of an active system and a backup system, the distribution device may include information on timing for processing a packet in the packet and transmit the packet. In a situation where maintenance and replacement of an operational distribution device is performed, for example, when broadcasting is performed for 24 hours, it is difficult to stop the broadcasting output. Therefore, it is necessary to stop the output of the distribution device for maintenance and replacement of the operation system distribution device and switch the distribution to the backup system distribution device, and the above information contained in the packet received by the playback device is disturbed. Then, it becomes difficult to reproduce the content well.

On the other hand, the switching method according to the first embodiment of the present invention is a switching method for switching the content retransmission from the active IP retransmission device 101 to the standby IP retransmission device 101. First, the frequency of the broadcast wave received by the standby IP retransmission device 101 is matched with the frequency of the broadcast wave received by the active IP retransmission device 101. Next, the timing information regarding the processing timing in the content reproduction device, for example, IP-STB171, for example, the difference Δt regarding the time stamp, which is generated in the IP retransmission device 101 of the operation system, is given to the IP retransmission device 101 of the standby system. Next, at a predetermined timing, the content retransmission is switched from the active IP retransmission device 101 to the standby IP retransmission device 101. Next, the switching destination IP retransmission device 101 includes the processing timing based on the given timing information in the IP packet and transmits the IP packet.

In IP-STB171, the switching destination is compared with the case where the output stop timing of the active IP retransmission device 101 and the output start timing of the standby IP retransmission device 101 are simply switched by such a method. The TTS packet transmitted from the IP retransmission device 101 of the above can be stably processed, and the content can be reproduced satisfactorily.

Therefore, in the switching method according to the first embodiment of the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

Further, in the switching method according to the first embodiment of the present invention, information on the reference timing, for example, PCR included in the broadcast wave is acquired in each IP retransmission device 101. The difference Δt is generated in the operational IP retransmission device 101 based on PCR.

In this way, the time stamp value of the active IP retransmission device 101 and the time of the standby IP retransmission device 101 are calculated by the method of calculating the difference Δt based on the PCR included in the broadcast signal distributed by the distributor 152. The stamp values can be easily matched. Further, it is possible to avoid the influence of the transmission delay of the difference Δt from the IP retransmission device 101 of the operating system to the IP retransmission device 101 of the standby system via the control device 151.

Further, in the IP retransmission system according to the first embodiment of the present invention, the IP retransmission device 101 receives the same broadcast wave from the distributor 152, includes the content included in the broadcast wave in the IP packet, and retransmits the IP packet. Send. The IP packet output from each IP retransmission device 101 is relayed by a relay device such as the L2 switch 155 and transmitted to the network. The standby system IP retransmission device 101 matches the frequency of the received broadcast wave with the frequency of the broadcast wave received by the active system IP retransmission device 101. The standby system IP retransmission device 101 transmits timing information regarding processing timing in the content reproduction device, for example, IP-STB171, for example, a difference Δt regarding a time stamp, which is generated in the operation system IP retransmission device 101, via the control device 151. get. The control device 151 stops the retransmitting of the content at a predetermined timing on the operating system IP retransmitting device 101 as a switching of the content retransmitting, and retransmits the content on the standby IP retransmitting device 101 at a predetermined timing. Start sending. The switching destination IP retransmission device 101 includes the processing timing based on the given timing information in the IP packet and transmits the IP packet.

That is, in the IP retransmission device according to the first embodiment of the present invention, the control unit 18 generates timing information regarding processing timing in the content reproduction device, for example, IP-STB171, for example, a difference Δt regarding a time stamp. The control unit 18 notifies the other IP retransmission device 101 of the generated timing information. The control unit 18 acquires the timing information notified from the other IP retransmission device 101. The TTS processing unit 15 generates and transmits an IP packet including processing timing based on the timing information acquired by the control unit 18.

With such a configuration, in the IP-STB171, the switching destination is compared with the case where the output stop timing of the active IP retransmission device 101 and the output start timing of the standby IP retransmission device 101 are simply switched. The TTS packet transmitted from the IP retransmission device 101 of the above can be stably processed, and the content can be reproduced satisfactorily.

Therefore, in the IP retransmission system and the IP retransmission device according to the first embodiment of the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

Further, in the control device according to the first embodiment of the present invention, the broadcast wave command unit 31 transmits the frequency of the received broadcast wave to the standby system IP retransmission device 101 to the operation system IP retransmission. Notifies an instruction to match the frequency of the broadcast wave received by the device 101. The acquisition unit 32 acquires the timing information regarding the processing timing in the content reproduction device, for example, the IP-STB171, which is generated by the IP retransmission device 101 of the operation system, for example, the difference Δt regarding the time stamp. The information giving unit 33 gives the timing information acquired by the acquiring unit 32 to the standby system IP retransmission device 101. Then, in the switching instruction unit 34, the active IP retransmission device 101 stops the content retransmission at a predetermined timing, and the standby IP retransmission device 101 starts the content retransmission at a predetermined timing. Notify the order.

With such a configuration, in the IP-STB171, the switching destination is compared with the case where the output stop timing of the active IP retransmission device 101 and the output start timing of the standby IP retransmission device 101 are simply switched. The TTS packet transmitted from the IP retransmission device 101 of the above can be stably processed, and the content can be reproduced satisfactorily.

Therefore, in the control device according to the first embodiment of the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

Further, in the IP retransmission system according to the first embodiment of the present invention, the IP retransmission device 101 receives the same broadcast wave from the distributor 152, includes the content included in the broadcast wave in the IP packet, and retransmits the IP packet. Send. The IP packet output from each IP retransmission device 101 is relayed by a relay device such as the L2 switch 155 and transmitted to the network. The standby system IP retransmission device 101 matches the frequency of the received broadcast wave with the frequency of the broadcast wave received by the active system IP retransmission device 101. The matching unit matches the internal state that is the source of the output from each of the active system IP retransmission device 101 and the standby system IP retransmission device 101 and that causes individual differences. The switching unit stops the retransmission of the content at a predetermined timing on the operating system IP retransmission device 101 and retransmits the content to the standby IP retransmission device 101 at a predetermined timing as switching of the content retransmission. To start.

Further, in the IP retransmission device according to the first embodiment of the present invention, the processing unit is an internal source of output from each of the active system IP retransmission device 101 and the standby system IP retransmission device 101. Processes are performed to match the internal states that are states and cause individual differences. Then, the IP conversion unit 17 outputs the IP packet as an output unit.

With such a configuration, individual differences between the active IP retransmission device 101 and the standby IP retransmission device 101 can be absorbed, and the internal state that is the source of the output from each device can be matched. Therefore, for example. In the IP-STB171, the IP packet transmitted from the switching destination IP retransmission device 101 can be stably processed, and the content can be reproduced satisfactorily.

Therefore, in the IP retransmission system and the IP retransmission device according to the first embodiment of the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

Further, the switching method according to the first embodiment of the present invention is a switching method for switching content retransmission from the active IP retransmission device 101 to the standby IP retransmission device 101. First, the frequency of the broadcast wave received by the standby IP retransmission device 101 is matched with the frequency of the broadcast wave received by the active IP retransmission device 101. Next, the internal states that are the sources of the outputs from each of the active system IP retransmission device 101 and the standby system IP retransmission device 101 and that cause individual differences are matched. Next, at a predetermined timing, the content retransmission is switched from the active IP retransmission device 101 to the standby IP retransmission device 101.

By such a method, individual differences between the active system IP retransmission device 101 and the standby system IP retransmission device 101 can be absorbed, and the internal state that is the source of the output from each device can be matched. Therefore, for example. In the IP-STB171, the IP packet transmitted from the switching destination IP retransmission device 101 can be stably processed, and the content can be reproduced satisfactorily.

Therefore, in the switching method according to the first embodiment of the present invention, stable content reproduction in the reproduction device can be realized in a configuration in which the content transmission device can be switched.

Further, in the IP retransmission system, the IP retransmission device, and the switching method according to the first embodiment of the present invention, the IP retransmission device 101 uses the processing timing in the content reproduction device, for example, the TS packet in the IP-STB171. The time stamp, which is the processing timing, is included in the IP packet and transmitted. The internal state is a time stamp count value.

In this way, by matching the time stamp value between the IP retransmission devices 101 as the internal state, the IP-STB171 stably processes the TS packet transmitted from the switching destination IP retransmission device 101. It is possible to play the content well.

Next, other embodiments of the present invention will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and the description thereof will not be repeated.

<Second embodiment>
The present embodiment relates to an IP retransmission system to which a monitoring function is added as compared with the IP retransmission system according to the first embodiment. Except for the contents described below, the same as the IP retransmission system according to the first embodiment.

FIG. 7 is a diagram showing a configuration of an IP retransmission system according to a second embodiment of the present invention.

With reference to FIG. 7, the IP retransmission system 302 further includes a monitoring device 164 as compared to the IP retransmission system according to the first embodiment of the present invention.

The monitoring device 164 monitors the output of the IP retransmission device 101 via the L2 switch 155 and detects an abnormality.

FIG. 8 is a diagram showing an example of packet transmission in the IP retransmission system according to the second embodiment of the present invention.

With reference to FIG. 8, a video packet which is a TS packet containing video data, a voice packet which is a TS packet containing voice data, and a PCR packet are transmitted to each IP retransmission device 101 by a broadcast signal.

Further, a video packet which is a TTS packet containing video data, a voice packet which is a TTS packet containing voice data, and a video PCR packet which is a TTS packet containing video data and PCR are transmitted by an IP packet to an operational IP retransmission device. It is transmitted from 101 to the L2 switch 155.

For example, the transmission cycle of the PCR packet transmitted by the broadcast signal is 100 ms, and the transmission cycle of the video PCR packet from the IP retransmission device 101 is 80 ms.

As described above, in the modified example of the IP retransmission device 101, the video PCR packet is transmitted at a predetermined cycle according to the timing of the counter 21 that operates by the self-propelled clock. Therefore, the transmission cycle of the video PCR packet from each IP retransmission device 101 is constant, but the phase is often different due to a change over time or a difference in the activation timing of the device.

Therefore, as shown in FIG. 8, the transmission cycle of the video PCR packet is disturbed at the timing of switching from the active system IP retransmission device 101B to the standby system IP retransmission device 101A. When the monitoring device 164 monitors the transmission cycle of the video PCR packet from the IP retransmission device 101, for example, the monitoring device 164 may erroneously detect an abnormality.

Therefore, in the IP retransmission system according to the second embodiment of the present invention, such a problem is solved by the following configuration and operation.

That is, in the IP retransmission system 302, the matching unit is an internal state that is a source of output from each of the active IP retransmission device 111 and the standby IP retransmission device 111, and is an internal state in which individual differences occur. To match. This matching unit corresponds to, for example, the control unit 18, the TTS processing unit 15, and the multiplexing unit 14 in the IP retransmission device 111, and the acquisition unit 32 and the information giving unit 33 in the control device 151.

The switching unit stops the retransmission of the content at a predetermined timing on the active IP retransmission device 111 and retransmits the content to the standby IP retransmission device 111 at a predetermined timing as switching of the content retransmission. To start. This processing unit corresponds to, for example, the switching command unit 34 in the control device 151.

In the IP retransmission device 111, the processing unit matches the internal states that are the sources of output from each of the active system IP retransmission device 111 and the standby system IP retransmission device 111 and that cause individual differences. Perform the process to make it. This processing unit corresponds to, for example, the control unit 18, the TTS processing unit 15, and the multiplexing unit 14 in the IP retransmission device 111.

For example, the internal state is a reference timing, for example, an output timing of PCR information from the IP retransmission device 101.

FIG. 9 is a diagram showing the configuration of another example of the IP retransmission device in the IP retransmission system according to the second embodiment of the present invention.

With reference to FIG. 9, the IP retransmission device 111 does not include the counter 21 as compared with the modified example of the IP retransmission device 101 shown in FIG.

The multiplexing unit 14 outputs the video PCR packet to the TTS processing unit 15 at a predetermined cycle by referring to the count value of the counter 19. More specifically, the multiplexing unit 14 outputs a video PCR packet at the count value at regular intervals.

Similar to the IP retransmission device 101, the count value of the counter 19 in the active system IP retransmission device 111 and the count value of the counter 19 in the standby system IP retransmission device 111 change at substantially the same value. Therefore, the transmission timing of the video PCR packet from each IP retransmission device 111 can be matched, and the phase of the transmission cycle of the video PCR packet can be matched.

FIG. 10 is a diagram showing another example of packet transmission in the IP retransmission system according to the second embodiment of the present invention.

With reference to FIG. 10, the multiplexing unit 14 TTS processing the video PCR packet at the timing when the count value of the counter 19 becomes, for example, 0x200,000 (“0x” is hexadecimal notation), 0x400,000, 0x600,000, and 0x800,000. Output to 15. When the counter 19 operates according to the timing of the clock of 27 MHz, the video PCR packet is sent out at a cycle of 77.6 ms.

As a result, as shown in FIG. 10, at the timing of switching from the active system IP retransmission device 111B to the standby system IP retransmission device 111A, the transmission cycle of the video PCR packet is not disturbed, and the monitoring device 164 can display the monitoring device 164. Even before and after the switching timing, it is possible to confirm the state in which the video PCR packets having a predetermined cycle are transmitted.

Since other configurations and operations are the same as those of the IP retransmission system according to the first embodiment, detailed description will not be repeated here.

Further, in the IP retransmission system, the IP retransmission device, and the switching method according to the second embodiment of the present invention, the reference timing, for example, PCR information included in the broadcast wave is acquired in each IP retransmission device 101. The IP retransmission device 101 includes the PCR information in the IP packet and retransmits it. The internal state is the output timing of the PCR information from the IP retransmission device 101.

In this way, by matching the PCR transmission timing between the IP retransmission devices 111 as the internal state, it is possible to prevent erroneous detection of an abnormality by the monitoring device 164 due to switching, for example.

In the IP retransmission system according to the first embodiment and the second embodiment of the present invention, the output is from each of the active IP retransmission device and the standby IP retransmission device. As the internal state, the time stamp value and the PCR output timing are matched between the IP retransmission devices, respectively, but the present invention is not limited to this. The IP retransmission system according to the embodiment of the present invention matches other internal states that cause individual differences between the IP retransmission devices by changing with the passage of time or by the activation timing or the like. It may be a configuration.

It should be considered that the above embodiments are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above description includes the features described below.
[Appendix 1]
A plurality of IP retransmission devices that receive the same broadcast wave from the distributor and retransmit the content included in the broadcast wave by including it in an IP packet.
Equipped with a control device
The IP packet output from each IP retransmission device is relayed by the relay device and transmitted to the network.
The standby system IP retransmission device adjusts the frequency of the received broadcast wave to the frequency of the broadcast wave received by the operation system IP retransmission device.
The standby system IP retransmission device acquires timing information regarding the processing timing of the content playback device generated in the operation system IP retransmission device via the control device.
At a predetermined timing, the control device causes the IP retransmission device of the operating system to stop the retransmission of the content, and causes the IP retransmission device of the standby system to start the retransmission of the content.
The standby system IP retransmission device includes the processing timing based on the given timing information in the IP packet and transmits the IP packet.
The predetermined timing is a timing designated by using the processing timing.
The operating system IP retransmission device uses the count value of a counter that operates according to the timing of the self-propelled clock as the processing timing.
The timing information indicates a difference between the reference timing included in the broadcast wave and the processing timing in the IP retransmission device of the operation system.
The standby system IP retransmission device sets the count value of a counter that operates according to the timing of the self-propelled clock as the processing timing, and corrects the processing timing based on the timing information.
The IP retransmission device includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of the IP packets and retransmits the contents.
The processing timing is an IP retransmission system that is the processing timing of the TS packet in the playback device.

[Appendix 2]
An IP retransmission device in an IP retransmission system that receives a broadcast wave and retransmits the content contained in the broadcast wave by including it in an IP packet.
A timing information generation unit that generates timing information regarding processing timing in the content playback device, and
A notification unit that notifies other IP retransmission devices of the timing information generated by the timing information generation unit, and
An acquisition unit that acquires the timing information notified from the other IP retransmission device, and
A packet processing unit that generates and transmits the IP packet including the processing timing based on the timing information acquired by the acquisition unit is provided.
The predetermined timing is a timing designated by using the processing timing.
The IP retransmission device uses the count value of a counter that operates according to the timing of the self-propelled clock as the processing timing.
The timing information indicates a difference between the reference timing included in the broadcast wave and the processing timing in the IP retransmission device.
The IP retransmission device sets the count value of a counter that operates according to the timing of the self-propelled clock as the processing timing, and corrects the processing timing based on the timing information.
The packet processing unit includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of the IP packets and retransmits the packet.
The processing timing is an IP retransmission device that is a processing timing of the TS packet in the playback device.

[Appendix 3]
A control device in an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave by including it in an IP packet.
A broadcast wave command unit that notifies the standby system IP retransmission device of a command to match the frequency of the received broadcast wave to the frequency of the broadcast wave received by the operation system IP retransmission device.
An acquisition unit that acquires timing information regarding processing timing in the content playback device, which is generated in the operation system IP retransmission device, and
An information giving unit that gives the timing information acquired by the acquisition unit to the standby system IP retransmission device, and
A switching command for notifying an instruction that the IP retransmission device of the operating system stops the retransmission of the content at a predetermined timing and the IP retransmission device of the standby system starts the retransmission of the content at a predetermined timing. With a department,
The predetermined timing is a timing designated by using the processing timing.
The processing timing is a count value of a counter that operates according to the timing of the self-propelled clock in the IP retransmission device of the operation system.
The timing information indicates a difference between the reference timing and the processing timing in the IP retransmission device of the operation system.
The IP retransmission device includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of the IP packets and retransmits the contents.
The processing timing is a control device which is the processing timing of the TS packet in the reproduction device.

[Appendix 4]
An IP retransmission system including a plurality of IP retransmission devices that receive the same broadcast wave from a distributor and retransmit the content included in the broadcast wave by including it in an IP packet.
The IP packet output from each IP retransmission device is relayed by the relay device and transmitted to the network.
The standby system IP retransmission device adjusts the frequency of the received broadcast wave to the frequency of the broadcast wave received by the operation system IP retransmission device.
The IP retransmission system further
A matching unit that matches the internal states that are the sources of output from each of the active IP retransmission device and the standby IP retransmission device and that cause individual differences.
As a switch for retransmitting the content, the IP retransmission device of the operating system stops the retransmission of the content at a predetermined timing, and the IP retransmission device of the standby system retransmits the content at a predetermined timing. Equipped with a switching part to start
The IP retransmission device includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of the IP packets and retransmits the contents.
The IP retransmission system, wherein the internal state is the output timing of the IP packet containing PCR information from the IP retransmission device, or the count value of the time stamp included in the IP packet.

[Appendix 5]
The IP retransmission device in an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content included in the broadcast wave by including it in an IP packet.
A processing unit that performs processing for matching the internal state that is the source of output from each of the IP retransmission device of the active system and the IP retransmission device of the standby system and that causes individual differences.
It is provided with an output unit that outputs the IP packet.
The IP retransmission device includes a plurality of TS packets including information in which the content is divided into a plurality of pieces in one or a plurality of the IP packets and retransmits the contents.
The IP retransmission device, wherein the internal state is an output timing of the IP packet containing PCR information from the IP retransmission device, or a count value of a time stamp included in the IP packet.

11 Tuner 12 Desk rumble part 13 Transcoding part 14 Multiplexing part 15 TTS processing part (packet processing part)
16 Scramble section 17 IP conversion section 18 Control section (timing information generation section, notification section and acquisition section)
19, 21 Counter 20 Switch circuit 31 Broadcast wave command unit 32 Acquisition unit 33 Information addition unit 34 Switching command unit 101,111 IP retransmission device 151 Control device 152 Distributor 153, 154, 155 L2 switch 161 All-station SI server 162 Emergency alarm Server 163 Key server 164 Monitoring device 301 IP retransmission system 401 IP network 171 IP-STB
301, 302 IP retransmission system

Claims (4)

In an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content contained in the broadcast wave in an IP packet, the IP retransmission device of the operation system retransmits the content. This is a switching method for switching from the standby system to the IP retransmission device.
A step of matching the frequency of the broadcast wave received by the IP retransmission device of the operating system to the frequency of the broadcast wave received by the IP retransmission device of the standby system.
A step of matching the internal states that are the sources of output from each of the active IP retransmission device and the standby IP retransmission device and that cause individual differences.
At a predetermined timing, seen including a step of switching the retransmission of IP retransmission said content to a device of the standby system from IP retransmission apparatus of the active system,
Information on the reference timing included in the broadcast wave is acquired by each of the IP retransmission devices.
The IP retransmission device includes the reference timing information in the IP packet and retransmits the information.
The switching method , wherein the internal state is an output timing of the reference timing information from the IP retransmission device. The IP retransmission device includes the processing timing in the content playback device in the IP packet and transmits the IP packet.
The internal state is further a count value of the processing timing, switching method of claim 1. An IP retransmission system including a plurality of IP retransmission devices that receive the same broadcast wave from a distributor and retransmit the content included in the broadcast wave by including it in an IP packet.
The IP packet output from each IP retransmission device is relayed by the relay device and transmitted to the network.
The standby system IP retransmission device adjusts the frequency of the received broadcast wave to the frequency of the broadcast wave received by the operation system IP retransmission device.
The IP retransmission system further
A matching unit that matches the internal states that are the sources of output from each of the active IP retransmission device and the standby IP retransmission device and that cause individual differences.
As a switch for retransmitting the content, the IP retransmission device of the operating system stops the retransmission of the content at a predetermined timing, and the IP retransmission device of the standby system retransmits the content at a predetermined timing. Bei example and a switching unit configured to start,
Information on the reference timing included in the broadcast wave is acquired by each of the IP retransmission devices.
The IP retransmission device includes the reference timing information in the IP packet and retransmits the information.
The IP retransmission system, wherein the internal state is an output timing of the reference timing information from the IP retransmission device . The IP retransmission device in an IP retransmission system including a plurality of IP retransmission devices that receive a broadcast wave and retransmit the content contained in the broadcast wave in an IP packet.
A processing unit that performs processing for matching the internal states that are the sources of output from the IP retransmission device of the active system and the IP retransmission device of the standby system and that cause individual differences,
E Bei and an output unit which outputs the IP packet,
Information on the reference timing included in the broadcast wave is acquired by each of the IP retransmission devices.
The output unit includes the reference timing information in the IP packet and retransmits the information.
The IP retransmission device, wherein the internal state is an output timing of the reference timing information from the IP retransmission device.

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