JP4966737B2 - Broadcast signal selection conversion system - Google Patents

Description

The present invention relates to a broadcast signal selected conversion system to be provided to the receiving apparatus converts the signal format of the broadcast signal.

Conventional broadcast services (digital and analog broadcast services) are transmitted by modulating a broadcast signal by a transmission method set in advance by a transmission device installed in a broadcast station, and modulated by a reception device corresponding to the transmission method. This is done by receiving broadcast signals.
For example, in terrestrial digital broadcasting, a broadcast signal is transmitted by an ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) transmission method using a 6 MHz frequency band out of VHF band and UHF band radio waves. In BS digital broadcasting, broadcast signals are transmitted by an ISDB-S (Integrated Services Digital Broadcasting-Satellite) transmission method using a 27 MHz frequency band out of 12 GHz band radio waves.

There are various techniques for receiving such broadcasting services with different transmission methods and channels by a receiving device.
For example, in a broadcasting system using the ISDB-T or ISDB-S transmission method, a broadcast signal transmitted from a transmission device is transmitted to a frequency band (channel) different from that at the time of transmission without changing the transmission method by a signal format conversion device. There is a technology for converting the data into a receiving device and transmitting it to a receiving device. This technology has been put to practical use as a frequency conversion pass-through method for cable television. As described above, since the transmission method of the broadcast signal is not changed, only the frequency band is changed. Therefore, if the broadcast signal can be received in the frequency band, the reception device can receive the broadcast signal.

Further, in a broadcasting system that uses the ISDB-T or ISDB-S transmission method, there is a technique in which a broadcast signal transmitted from a transmission device is converted into another transmission method by a retransmission device and transmitted to a reception device. . This technology has been put into practical use as a transmodulation system for cable television. As described above, in the method of converting the transmission method, a receiving device corresponding to the transmission method is required. Therefore, a method of converting a broadcast signal into a transmission method that can be received by the receiving device using the signal format conversion device. Has been taken. This signal format conversion device is usually arranged as a set-top box of a receiving device or installed at an entrance of an apartment house or the like to convert a broadcast signal into a transmission format corresponding to the receiving device.
Note that the broadcasting service is also operated by a wireless or wired transmission method other than ISDB-T or ISDB-S (for example, an IP network).

In recent years, there are broadcast systems in which broadcast signals transmitted to a receiving device are not always the same, but are switched in time. For example, the system has been put into practical use by VOD (video on demand) using an IP network (see, for example, Non-Patent Document 1). In a system using a signal format conversion device, broadcast signals input to the signal format conversion device are switched over time.
In such a system, a selective transmission device that transmits only the broadcast signal requested by the reception device among all the broadcast signals to the reception device is used.

Here, with reference to FIG. 5, the signal format conversion apparatus shown in Non-Patent Document 1 that converts the signal format of a broadcast signal that changes with time and outputs the signal format in a certain channel will be described. FIG. 5 is a block diagram showing a configuration of a broadcast signal selection / conversion system including a conventional signal format conversion apparatus.
The broadcast signal selected conversion system S _B, based on the request of the signal format converter 3C (broadcasting signal request), from the total broadcast signal is selected transmission device 2, it is distributed via a communication network, the requested broadcast signals The signal format conversion device 3C converts the signal format of the selected broadcast signal into a signal format that can be viewed by the reception device 4.

Here, the signal format conversion device 3C converts the signal format of a fixed number (here, a maximum of three) of broadcast signals by the MPEG decoder D (D ₁ ,..., D ₃ ), and modulates the modulation means M (M ₁ , ..., the _{M 6),} the receiving apparatus _{4 (4} 1, ..., and outputs a fixed channel by modulating every _{4 6).} At this time, each channel is frequency-multiplexed by the multiplexing unit Mu and output to a local transmission line such as a LAN or a coaxial cable. In the example of FIG. 5, the signal format conversion device 3C outputs a maximum of three types of broadcast signals using a maximum of six channels.
At this time, for example, when two receiving apparatuses 4 (4 ₁ , 4 ₂ ) are connected, the signal format conversion apparatus 3C always outputs a broadcast signal output to the _first receiving apparatus 41 as a fixed channel. It is done with Ch ₁ . Also, the broadcasting signal output to the second unit of the receiving apparatus 4 _2, is always carried out in the channel Ch ₂ fixed.

Here, when the type of the broadcast signal output to the _first receiving device 41 is switched from A to B, the signal format conversion device 3C stops the output of the broadcast signal A to the selective transmission device 2, and the broadcast signal B A broadcast signal request for starting the output of is transmitted. Then, the signal format converter 3C stops transmission of the broadcast signal A that has been transmitted on the channel Ch _1, starts transmission of the broadcast signal B on channel Ch _1. This broadcast signal request is requested to the signal format conversion device 3C by a dedicated remote control device (not shown), and the request is sent from the signal format conversion device 3C via the communication network or the like. It is done by being sent to.

Thus, first unit of the receiving apparatus 4 _1, be a different type of broadcast signal, always receives a broadcast signal at channel Ch ₁ fixed. At this time, the signal format converter 3C is to transmit the same broadcast signal B in the receiving apparatus _{4 1} and the receiver _{4 2,} to channel Ch _1, the receiving apparatus _{4 2} to the receiving apparatus _{4 1} Te is so that channel Ch _2, and transmits a broadcast signal B respectively different channels.
Hydra (registered trademark) HD IP Video Gateway, [online], search April 23, 2007, Internet <URL: http://www.entone.com/index.php/entone/content/download/216/2028 / file / Hydra datasheet.pdf>

  Since the conventional signal format conversion apparatus described above has a fixed output channel for each connected receiving apparatus, when a plurality of receiving apparatuses receive the same type of broadcast signal, the same broadcast signal is transmitted through a plurality of different channels. Will be sent. As described above, the conventional signal format conversion apparatus uses a plurality of channels even for the same broadcast signal, and thus has a problem that the transmission path utilization efficiency is poor.

  In addition, since the conventional signal format conversion device has a fixed output channel for each connected receiving device, it cannot switch the broadcast signal to be viewed in response to a request from a currently popular receiving device. There's a problem. In addition, when switching broadcast signals, it is necessary to request the selected transmission device to switch broadcast signals. Therefore, the selection transmission device is different from the selection of broadcast signals in currently popular reception devices. It is necessary to prepare a remote control device or the like for selecting a broadcast signal, and there is a problem that the device becomes expensive and the operation becomes complicated.

The present invention has been made in order to solve the above-described problems, and in a system for viewing a broadcast signal received in response to a request from a receiving apparatus by temporally switching, the dedicated broadcasting signal selection for a selected transmitting apparatus is performed. Without using a remote control device or the like, it is possible to view broadcast signals broadcast in different signal formats by selecting a broadcast signal from the receiving device, and there are a plurality of receiving devices, and different receiving devices are the same. and to provide a broadcast signal selected conversion system capable of enhancing a transmission path use efficiency even when receiving the type of broadcast signal.

The present invention was devised to achieve the above object. First, the broadcast signal selection conversion system according to claim 1 is configured to receive a broadcast signal selected by a receiving device from a plurality of received broadcast signals. A selective transmission device that selects and transmits, and a broadcast signal selected by the selective transmission device is converted into a predetermined signal format, and is also modulated into a broadcast signal in a frequency band corresponding to the broadcast signal, and is transmitted to the reception device. A broadcast signal selection / conversion system comprising a signal format conversion device for transmission , wherein the signal format conversion device comprises request signal receiving means and broadcast signal selection means, and the signal format conversion device comprises storage means. And a signal conversion means, a frequency information extraction means, a modulation means, and a multiplexing means.

In such a configuration, the broadcast signal selection conversion system receives a request signal for selecting a broadcast signal from the receiving device by the request signal receiving unit of the selective transmission device . Then, the broadcast signal selection conversion system selects a requested broadcast signal from a plurality of broadcast signals based on the request signal received by the request signal reception means by the broadcast signal selection means of the selective transmission device, and the signal format Output to the converter . Further, the broadcast signal selection conversion system stores identification information for identifying the type of broadcast signal, frequency information indicating a frequency band that is a channel for transmitting the broadcast signal to the reception device, in the storage unit of the signal format conversion device. Are stored in association with each other in advance.

  In the broadcast signal selection conversion system, the signal conversion means of the signal format conversion device converts the broadcast signal input from the selection transmission device into a predetermined signal format that can be viewed by the reception device. For example, when the broadcast signal transmitted by the ISDB-T transmission method is viewable by the receiving device, the signal conversion unit converts the input broadcast signal into a broadcast signal of the ISDB-T transmission method.

Also, in the broadcast signal selection / conversion system, the identification information is extracted from the control information included in the broadcast signal by the frequency information extraction means of the signal format conversion device, and the frequency information corresponding to the identification information is read from the storage means. This control information is information for specifying the broadcast service content such as the type of broadcast signal and video / data. For example, in the case of BS digital broadcasting, it is program specific information (PSI). The identification information is information for identifying the type of broadcast signal. For example, in the case of BS digital broadcasting, the ID is a unique ID called TS_id for each type of broadcast signal (MPEG-2 transport stream (TS)). It is .

Then, the broadcast signal selection conversion system modulates the broadcast signal converted by the signal conversion means by the modulation means of the signal format conversion device into a broadcast signal in the frequency band indicated by the frequency information read by the frequency information extraction means. To do.
The broadcast signal selection / conversion system multiplexes a plurality of broadcast signals modulated by the modulation means by the multiplexing means of the signal format conversion device. As a result, a plurality of broadcast signals modulated to a channel specific to the broadcast signal are distributed through the same transmission path.

The broadcast signal selection conversion system according to claim 2 is a selection transmission device that selects and transmits a broadcast signal selected by a reception device from a plurality of received broadcast signals, and is selected by the selection transmission device. A broadcast signal selection conversion system comprising: a signal format conversion device that converts a broadcast signal into a predetermined signal format, modulates the broadcast signal into a broadcast signal in a frequency band corresponding to the broadcast signal, and transmits the signal to the reception device. The signal format conversion device comprises request signal receiving means and broadcast signal selection means, and the signal format conversion device comprises storage means, signal conversion means, frequency information extraction means, and modulation means. It was set as the structure provided.

In such a configuration, the broadcast signal selection conversion system receives a request signal for selecting a broadcast signal from the receiving device by the request signal receiving unit of the selective transmission device. Then, the broadcast signal selection conversion system selects a requested broadcast signal from a plurality of broadcast signals based on the request signal received by the request signal reception means by the broadcast signal selection means of the selective transmission device, and the signal format Output to the converter. The broadcast signal selected conversion system, the memorize means of the signal format converter, the identification information for specifying the type of broadcast signal, the broadcast signal and frequency information indicating a frequency band for transmission corresponded beforehand to Remember.
The broadcast signal selected conversion system, the signal conversion means of the signal format converter converts an input broadcast signal in a predetermined signal format viewable by the receiving device. The broadcast signal selected conversion system, the frequency information extracting means of the signal format converter, and extracts the identification information from the control information included in the broadcast signal, reads out the frequency information corresponding to the identification information from the storage means.
The broadcast signal selected conversion system, the modulation means of the signal format converter, a broadcast signal converted by the signal converting means, a frequency band broadcasting signal indicated by the frequency information read by the frequency information extracting means Modulate.

The present invention has the following excellent effects.
According to the present invention, a broadcast signal selected by the reception apparatus can be converted into viewable signal format at the receiving device.
Further, according to the present invention, as in the past, to the receiving device, without having to transmit the broadcast signal at a unique channel (frequency band), and modulates a broadcast signal for each broadcast signal specific channel Can be sent. As a result, in the case of the same broadcast signal, the broadcast signal is transmitted on the same channel, so that the transmission path utilization efficiency can be improved.

  Furthermore, according to the present invention, since the broadcast signal is transmitted to the receiving device through the same channel as the channel selected by the receiving device (attached remote control device), the broadcasting signal and the channel are associated one-to-one. The remote control operation when selecting a program can be facilitated. Further, since a remote control device for channel selection dedicated to the selective transmission device is not used, the system can be configured at low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Broadcast signal selection conversion system]
First, the configuration of a broadcast signal selection conversion system according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a broadcast signal selection conversion system according to the present invention.

The broadcast signal selection / conversion system S converts the broadcast signal requested by the receiving device into a signal format that can be viewed by the receiving device, and transmits the signal to the receiving device. Here, the broadcast signal selective conversion system S includes a transmission device 1, a selective transmission device 2, a signal format conversion device 3, and a plurality of reception devices 4 (4 ₁ ,..., 4 _N ). Yes.

The transmission device 1 is arranged at a broadcasting station and transmits a broadcast signal. Here, the transmission device 1 transmits a plurality of (for example, about 100 types) broadcast signals to the selective transmission device 2. The broadcast signal transmitted from the transmitter 1 is a signal transmitted by a transmission method used in digital broadcasting such as ISDB-T and ISDB-S .

  The selective transmission device 2 selects a broadcast signal from a plurality of broadcast signals transmitted from the transmission device 1 based on a request (broadcast signal request) requested by the reception device 4. The broadcast signal selected by the selective transmission device 2 is output to the signal format conversion device 3. It is assumed that the request for the selective transmission device 2 is transmitted by being connected to the reception device 4 via a LAN, a dedicated cable, or the like. In addition, when the selective transmission device 2 is located at a place where the selective transmission device 2 can be operated from the remote control device attached to the reception device 4, the selection transmission device 2 requests a signal for selecting a broadcast signal transmitted from the remote control device. It is good also as acquiring as a signal.

  The signal format conversion device 3 receives a broadcast signal selected and output by the selective transmission device 2 and converts it into a predetermined signal format. The broadcast signal whose signal format has been converted is transmitted to the receiving device 4 via a coaxial cable or the like, for example. Note that the number and type of broadcast signals input to the signal format conversion device 3 change over time according to a request from the reception device 4 to the selective transmission device 2. The detailed configuration of the signal format conversion device 3 will be described later.

  The reception device 4 receives the broadcast signal converted by the signal format conversion device 3, and demodulates and decodes the broadcast signal into a display format that can be viewed by the viewer. The receiving device 4 transmits a request (broadcast signal request) for requesting a broadcast signal selected by the viewer to the selective transmission device 2 via a remote control device (not shown), so that the broadcast signal desired by the viewer is obtained. Receive. Then, the receiving device 4 demodulates the broadcast signal in accordance with the channel through which the requested broadcast signal is transmitted.

Here, as an example, the receiving device 4 is a device capable of receiving a broadcast signal corresponding to the ISDB-T transmission system for digital terrestrial broadcasting, and the broadcast signal transmitted from the transmitting device 1 is other than ISDB-T. broadcast signal (e.g., broadcast signals such as ISDB-S transmission method) and it is. Therefore, here, the signal format conversion device 3 will be described as converting a broadcast signal other than ISDB-T into an ISDB-T broadcast signal.
Hereinafter, the configuration and operation of the signal format conversion apparatus according to the present invention will be described in detail.

[Configuration of Signal Format Conversion Device: First Embodiment]
First, the configuration of the signal format conversion apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the signal format conversion apparatus according to the first embodiment of the present invention. The signal format conversion device 3 </ b> A shown in FIG. 2 is arranged at a position adjacent to the reception device 4 and includes one signal format conversion device 3 </ b> A for one reception device 4.

  Further, here, the configuration of the selective transmission device 2 is also described as a reference. The selective transmission device 2 includes request signal reception means 21 and broadcast signal selection means 22.

  The request signal receiving means 21 receives a request signal (broadcast signal request) from a remote control device (not shown) of the receiving device 4. This request signal is a unique signal previously associated with a button or the like when the viewer presses the button or the like of the remote control device.

The broadcast signal selection unit 22 selects a requested broadcast signal from all broadcast signals input to the selective transmission device 2 based on the request signal received by the request signal reception unit 21. The selected broadcast signal is output to the signal format conversion device 3A.
The selective transmission device 2 outputs only the broadcast signal requested from the reception device 4 to the signal format conversion device 3A out of all broadcast signals.

  Next, the configuration of the signal format conversion device 3A will be described. The signal format conversion device 3A includes a signal list storage unit 31, a frequency information extraction unit 32, a signal conversion unit 33, and a modulation unit 34.

The signal list storage unit (storage unit) 31 stores identification information for identifying the type of broadcast signal and frequency information indicating a frequency band for transmitting the broadcast signal in association with each other. This is a general storage device such as a semiconductor memory.
The signal list storage unit 31, for example, release transmission signal if the digital broadcasting, and is identification information for specifying the type of broadcast signal MPEG-2TS identifier (TS_id), in association with the frequency band Keep it.

  The signal list storage unit 31 may store the identification information and the frequency information in association with each other in advance, or may acquire and store the list information from the outside. For example, list information is separated and extracted from a broadcast signal in which list information in which identification information and frequency information are associated is multiplexed by a list separation and extraction unit (not shown), and stored in the signal list storage unit 31. Moreover, it is good also as acquiring list information via another network different from the acquisition path | route of a broadcast signal.

  The frequency information extraction unit 32 extracts identification information from the control information included in the broadcast signal, and reads the frequency information corresponding to the identification information from the signal list storage unit 31. The frequency information read by the frequency information extraction unit 32 is output to the modulation unit 34.

The control signal included in the broadcast signal is information for specifying the broadcast service content such as the type of broadcast signal and video / data. For example, in the case of BS digital broadcasting, program control information (PSI) is used. is there. The identification information is information for specifying the type of broadcast signal, and is, for example, an ID unique to each broadcast signal called TS_id in the case of BS digital broadcasting .

The signal conversion means 33 converts the input broadcast signal into a predetermined signal format . Converted broadcast signal in this signal conversion means 33 is output to the modulation unit 34.

  When frequency information indicating a frequency band for transmitting the broadcast signal is added to the control signal of the broadcast signal, the frequency information extracting unit 32 may extract the frequency information from the control signal. . For example, when the broadcast signal is a baseband MPEG-2TS to which modulation information is added as defined in ARIB STD-B31, the modulation information is read to read out the modulation information and control information to identify the TS Correspondence with channels (frequency information) for outputting TS can be extracted.

  The modulation means 34 modulates the broadcast signal converted into a predetermined signal format by the signal conversion means 33 into a broadcast signal in the frequency band indicated by the frequency information extracted by the frequency information extraction means 32.

  By configuring the signal format conversion device 3A in this manner, the signal format conversion device 3A converts the broadcast signal requested by the reception device 4 into a signal format that can be viewed by the reception device 4, and supports the broadcast signal. It can be modulated into a channel and output to the receiving device 4. At this time, when a broadcast signal is selected by the remote control device attached to the receiving device 4, the signal format conversion device 3A outputs the broadcast signal to the channel selected by the remote control device.

  The signal format conversion device 3A can be realized by a general computer having a CPU and a memory (not shown). At this time, the signal format conversion device 3A operates by a signal format conversion program that causes the computer to function as each of the above-described means.

[Configuration of Signal Format Conversion Device: Second Embodiment]
Next, the configuration of the signal format conversion apparatus according to the second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of a signal format conversion apparatus according to the second embodiment of the present invention. The signal format conversion device 3B shown in FIG. 3 allows a plurality of receiving devices 4 (4 ₁ , 4 ₂ ,..., 4 _N ) to view a broadcast signal requested by each receiving device 4. It is converted into and transmitted.

  This signal format conversion device 3B is placed, for example, at the entrance of an apartment house, and is connected to N (N ≧ 2) receivers 4 via coaxial cables as on-site transmission paths for broadcast signals. It is used. The configuration of the selective transmission device 2 is the same as that described with reference to FIG.

As shown in FIG. 3, the signal format conversion device 3B includes a signal list storage unit 31, a frequency information extraction unit 32, a plurality of signal conversion units 33 (33 ₁ ,..., 33 _M ), and a plurality of modulation units 34. (34 ₁ ,..., 34 _M ) and multiplexing means 35 are provided.
The signal list storage unit 31 and the frequency information extraction unit 32 have the same configuration as the signal format conversion device 3A described with reference to FIG. Further, the signal conversion means 33 (33 ₁ ,..., 33 _M ) and the modulation means 34 (34 ₁ ,..., 34 _M ) are the same as the signal format conversion apparatus 3A described in FIG. Therefore, the description is omitted.

  The multiplexing means 35 multiplexes a plurality of broadcast signals output from the modulation means 34. The multiplexing means 35 frequency-multiplexes the number of broadcast signals (for example, a maximum of M in FIG. 3) corresponding to the number of the modulation means 34 (for example, broadcast signals of ISDB-T transmission system), and transmits the local transmission line. Output to.

  By configuring the signal format conversion device 3B in this way, the signal format conversion device 3B converts the broadcast signal requested by the reception device 4 into a signal format that can be viewed by the reception device 4, and also supports the broadcast signal. It can be converted into a channel and output to the receiving device 4. At this time, since the signal format conversion device 3B multiplexes the broadcast signal on the channel selected by the reception device 4, it is not necessary to prepare a dedicated remote control device for the selective transmission device 2 separately. Also, since the output channel for each connected receiving device 4 is not fixed, even if a plurality of receiving devices 4 receive the same type of broadcast signal, the broadcast signal is transmitted on the same channel. As a result, the transmission line utilization efficiency can be increased.

  The signal format conversion device 3B can be realized by a general computer having a CPU and a memory (not shown). At this time, the signal format conversion device 3B operates according to a signal format conversion program that causes the computer to function as each of the above-described means.

[Operation of signal format converter]
Next, the operation of the signal format conversion apparatus according to the first embodiment of the present invention will be described with reference to FIG. 4 (refer to FIG. 2 as appropriate). FIG. 4 is a flowchart showing the operation of the signal format conversion apparatus according to the first embodiment of the present invention.

(Initial step)
First, the signal format conversion device 3A stores in advance in the signal list storage unit 31 the identification information for identifying the type of broadcast signal and the frequency information indicating the frequency band for transmitting the broadcast signal in association with each other. (Step S101). For example, MPEG-2TS TS_id, which is identification information for identifying a broadcast signal, and a frequency of a channel (for example, BS-15ch (center frequency 11.996 GHz)) that outputs the broadcast signal are stored in association with each other. .

(Signal conversion step)
When the broadcast signal is input (step S102), the signal format conversion device 3A converts the broadcast signal into a predetermined signal format that can be viewed by the reception device 4 by the signal conversion means 33 (step S103). For example, the signal converter 33 converts the broadcast signal into an ISDB-T broadcast signal.

(Frequency information extraction step)
On the other hand, the signal format conversion device 3A extracts identification information for identifying the type of the broadcast signal from the control information included in the broadcast signal input in step S102 by the frequency information extraction unit 32 (step S104). The frequency information corresponding to the identification information is read from the signal list storage unit 31 (step S105).

(Modulation step)
Then, the signal format conversion device 3A modulates the broadcast signal converted in step S103 into a broadcast signal in the frequency band indicated by the frequency information read in step S105 by the modulation unit 34 (step S106). The data is output to the device 4 (step S107).

  With the above operation, the signal format conversion device 3A converts the broadcast signal requested by the reception device 4 into a signal format that can be viewed by the reception device 4, and converts the signal into a channel corresponding to the broadcast signal. Can be output.

Here, as the initial step (S101), the identification information and frequency information of the broadcast signal are stored in association with each other in advance. However, before step S101, the identification information and frequency are extracted by a list separation and extraction unit (not shown). There may be provided a step of acquiring a broadcast signal in which list information associated with information is multiplexed, separating and extracting the list information from the broadcast signal, and storing it in the signal list storage means 31.
Further, step S103 and step S104 may be performed in advance or in parallel regardless of the order.

  Although the operation of the signal format conversion device 3A has been described here, the operation of the signal format conversion device 3B according to the second embodiment of the present invention shown in FIG. 3 is the same as the operation of the signal format conversion device 3A. Are the same except that the plurality of broadcast signals output from the plurality of modulation means 34 are multiplexed by the multiplexing means 35 after step S106 (multiplexing step). Therefore, description of the operation of the signal format conversion device 3B is omitted here.

The present invention is configured and operated as described above, so that a broadcast signal desired by a viewer can be selected and viewed by a request from a receiving device from a plurality of broadcast signals having different signal formats, It is possible to realize a signal format conversion device that can realize higher utilization efficiency of a transmission path. In addition, a broadcast signal selection / conversion system using this signal format conversion apparatus can use a commonly used reception apparatus as a reception apparatus as it is, and thus can realize a system configuration at low cost.
In the above description, it is assumed that a receiving apparatus compatible with the ISDB-T transmission format is used. However, the present invention can also be applied to a case where a receiving apparatus compatible with other transmission methods is used.

It is a block diagram which shows the structure of the broadcast signal selection conversion system which concerns on this invention. It is a block diagram which shows the structure of the signal format conversion apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the signal format conversion apparatus which concerns on 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the signal format conversion apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the broadcast signal selection conversion system containing the conventional signal format conversion apparatus.

Explanation of symbols

S broadcast signal selection conversion system 1 transmission device 2 selection transmission device 21 request signal reception means 22 broadcast signal selection means 3, 3A, 3B signal format conversion device 31 signal list storage means (storage means)
32 Frequency information extraction means 33 Signal conversion means 34 Modulation means 35 Multiplexing means 4 Receiver

Claims (2)

A selective transmission device that selects and transmits a broadcast signal selected by the reception device from a plurality of received broadcast signals, and converts the broadcast signal selected by the selective transmission device into a predetermined signal format, and the broadcast A broadcast signal selection conversion system comprising a signal format conversion device that modulates a broadcast signal in a frequency band corresponding to a signal and transmits the signal to the reception device,
The selective transmission device is:
Request signal receiving means for receiving a request signal for selecting a broadcast signal from the receiving device;
Broadcast signal selection means for selecting a requested broadcast signal from the plurality of broadcast signals based on the request signal received by the request signal receiving means, and outputting the selected signal to the signal format conversion device,
The signal format conversion device includes:
Storage means for preliminarily associating and storing identification information for identifying the type of broadcast signal and frequency information indicating a frequency band that is a channel for transmitting the broadcast signal to the receiving device ;
A plurality of signal conversion means for converting the broadcast signal input from the selective transmission device into a predetermined signal format that can be viewed on the reception device;
Frequency information extraction means for extracting the identification information from the control information included in the broadcast signal, and reading out frequency information corresponding to the identification information from the storage means;
A plurality of modulation means corresponding to the signal conversion means for modulating the broadcast signal converted by the signal conversion means into a broadcast signal in a frequency band indicated by the frequency information read by the frequency information extraction means;
Multiplexing means for multiplexing a plurality of broadcast signals modulated by the modulation means;
A broadcast signal selection / conversion system comprising: A selective transmission device that selects and transmits a broadcast signal selected by the reception device from a plurality of received broadcast signals, and converts the broadcast signal selected by the selective transmission device into a predetermined signal format, and the broadcast A broadcast signal selection conversion system comprising a signal format conversion device that modulates a broadcast signal in a frequency band corresponding to a signal and transmits the signal to the reception device,
The selective transmission device is:
Request signal receiving means for receiving a request signal for selecting a broadcast signal from the receiving device;
Broadcast signal selection means for selecting a requested broadcast signal from the plurality of broadcast signals based on the request signal received by the request signal receiving means, and outputting the selected signal to the signal format conversion device,
The signal format conversion device includes:
And identification information for identifying the type of the transmission signal release, and storage means for previously associating and storing the frequency information indicating the frequency band is a channel for transmitting the broadcast signal to the receiving device,
A signal conversion means for converting the broadcast signal input from the selective transmission device into a predetermined signal format that can be viewed by the reception device;
Frequency information extraction means for extracting the identification information from the control information included in the broadcast signal, and reading out frequency information corresponding to the identification information from the storage means;
Modulation means for modulating the broadcast signal converted by the signal conversion means into a broadcast signal in a frequency band indicated by the frequency information read by the frequency information extraction means;
A broadcast signal selection / conversion system comprising:

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