JP6444258B2 - Radio broadcast receiver - Google Patents

Description

  The present invention relates to a technique for switching a sound to be output from a broadcast that is outputting received sound to a received sound of another broadcast that is broadcasting the same content as the broadcast in a radio broadcast receiving apparatus.

  In a radio broadcast receiving device, from a broadcast that is outputting received sound to a received sound of another broadcast that is broadcasting the same content as the broadcast (a broadcast that has a relationship between a broadcast that is outputting received sound and a simulcast) As a technique for switching the sound to be output, in a radio broadcast receiving apparatus that receives FM broadcast and IP radio broadcast that is related to FM broadcast and simulcast, sound received by IP radio broadcast from sound received by FM broadcast In addition, when switching the sound to be output, the delay time of the sound received by the IP radio broadcast with respect to the sound received by the FM broadcast is calculated, and the sound received by the FM broadcast is expanded by time stretching that expands the sound in the time axis direction. After delaying the calculated delay time, the output sound is seamlessly changed from the sound received by FM broadcasting to the sound received by IP radio broadcasting. Ri replacing technique is known (e.g., Patent Document 1).

  In the radio broadcast receiving apparatus, as a technique for switching the output sound from the broadcast that is outputting the received sound to the received sound of the other broadcast that is broadcasting the same content as the broadcast, the digital radio broadcast, In a radio broadcast receiving apparatus that receives the digital radio broadcast and the analog radio broadcast that is related to the simulcast, the reception radio frequency of the analog radio broadcast delayed by the delay time of the digital radio broadcast with respect to the analog radio broadcast, and the digital radio There is known a technique for outputting analog radio broadcast reception sound that is not delayed during a period in which the emergency broadcast is being performed by analog radio broadcast while switching the sound to be output with the broadcast reception sound ( For example, Patent Document 2).

JP 2013-201469 A JP 2012-85207 A

  The audio received by FM broadcasting is delayed by the time of the delay time of the audio received by IP radio broadcasting with respect to the audio received by FM broadcasting by time stretching that expands the audio in the time axis direction, and the audio to be output is Patent Document 2 that outputs the received sound of the emergency broadcast without delay when the emergency broadcast is performed in the technology described in Patent Document 1 that seamlessly switches from the sound received by FM broadcast to the sound received by IP radio broadcast When this technology is applied, the following problems occur.

  That is, when an audio broadcast received by FM broadcasting is output by time-stretching, if an emergency broadcast is performed by FM broadcast, the received audio of the emergency broadcast is output without delay. When returning to the output of the audio received by the stretched FM broadcast, the audio received by the time-stretched FM broadcast is output with a delay, so that the emergency broadcast reception audio that has already been output after the return is output again. Sometimes. Such repeated output of the same emergency broadcast audio is redundant and cumbersome for the user.

  Therefore, when the radio broadcast being received cannot be received, the present invention changes the sound received from the radio broadcast to the sound received from another broadcast that is broadcasting the same content as the radio broadcast. In a radio broadcast receiving apparatus that performs seamless switching of sound output to a user, while receiving an output without delay of sound that is received by radio broadcast and should be preferentially notified to a user such as an emergency broadcast It is an object to suppress the repetition of the output of the sound.

  In order to achieve the above object, the present invention provides a radio broadcast receiving apparatus capable of receiving a radio broadcast and a parallel broadcast that is a broadcast that transmits audio having the same content as the radio broadcast with a delay relative to the radio broadcast. A radio receiver that outputs the received audio, a parallel broadcast receiver that receives the parallel broadcast and outputs the received audio, and a delay that outputs the audio output by the radio receiver with a delay The user can select one of a delay means having a variable time, a sound output from the radio receiver, a sound output from the parallel broadcast receiver, and a sound output from the delay means to the user. An output selection unit for outputting and a control unit are provided. Here, the delay unit is configured to delay time of the sound output from the radio reception unit until the delay time of the sound output from the delay unit with respect to the sound output from the radio reception unit coincides with a set delay target time. Performs a time stretch output operation that outputs a time stretch that expands the voice in the axial direction. In addition, the control unit switches the audio output to the user from the audio received by the radio broadcast receiving unit output by the delay unit to the audio received by the parallel broadcast receiving unit. The delay time of the sound output from the parallel broadcast receiver with respect to the sound output from the receiver is calculated, the calculated delay time is set as the delay target time in the delay means, and the time stretch output operation is performed in the delay means. When the time stretch output operation is completed, the output selection unit switches the sound output to the user from the sound output from the delay unit to the sound output from the parallel broadcast receiving unit. In the period during which the delay means is performing the time stretch output operation, the sound is a voice for notifying a predetermined type of information in the radio broadcast. When the notification voice is received, during the period of reception of the notification voice, the output selection unit is caused to select the voice output by the radio reception unit as the voice to be output to the user, and the reception period of the notification voice ends. Sometimes, the output selection unit returns the sound output to the user to the sound output by the delay means, and in the time stretch output operation, the notification sound is excluded from the sound output by performing time stretch. Then, the delay means is controlled so that the voice received after the announcement voice is subjected to time stretching after the voice received by the radio reception unit before the announcement voice.

  Here, such a radio broadcast receiving apparatus may be configured such that, in the control unit, the delay means temporarily stops the time stretch output operation during the notification sound receiving period.

In the above radio broadcast receiving apparatus, the notification sound may be, for example, a sound for notifying traffic information, caution information, or disaster information.
Further, the radio broadcast receiving apparatus described above is a time for performing time stretching for selectively expanding the sound in the time axis direction to the sound of the parallel broadcast receiving unit output to the output selecting unit. Stretching means is provided, and when the radio receiving unit receives the announcement sound by radio broadcasting during the period when the delay means performs the time stretch output operation in the control unit, the parallel broadcast receiving unit After the audio received before the same audio as the announcement audio, the audio received by the parallel broadcast receiving unit after receiving the same audio as the announcement audio is the audio that the parallel broadcast outputs to the output selection unit So that the parallel broadcast receiving unit performs time stretching to expand the sound in the time axis direction to the sound received before the same sound as the notification sound. May be configured to control said time stretching means.

  Here, in the radio broadcast receiving apparatus described above, the parallel broadcast may be an IP radio broadcast. In this case, the parallel broadcast reception unit receives the IP radio broadcast and outputs audio data representing received sound. It may be an IP radio player.

In the above radio broadcast receiving apparatus, the radio broadcast may be one or both of a digital radio broadcast and an analog radio broadcast.
Further, the above radio broadcast receiving apparatus may be a vehicle-mounted radio broadcast receiving apparatus mounted on a car.
According to the radio broadcast receiving apparatus as described above, the notification sound received without delay by the radio broadcast during the time stretch output operation of the delay means is output from the target of the time stretch output operation of the delay means thereafter. Since it is excluded, it is not output to the user. Therefore, it is possible to prevent the announcement voice from being output twice.

  As described above, according to the present invention, when a radio broadcast that is being received cannot be received, it is received from another broadcast that is broadcasting the same content as the radio broadcast from the sound received by the radio broadcast. In a radio broadcast receiving apparatus that seamlessly switches the sound output to the user to the sound that is being transmitted, there is no delay in the sound that should be preferentially notified to the user such as an emergency broadcast received by the radio broadcast While outputting, it is possible to suppress repetition of the output of the sound.

It is a block diagram which shows the structure of the radio broadcasting system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the radio broadcast receiver which concerns on embodiment of this invention. It is a flowchart which shows the seamless switching process which concerns on embodiment of this invention. It is a flowchart which shows the notification audio | voice output control process which concerns on embodiment of this invention. It is a figure which shows the example of the seamless switching operation | movement which concerns on embodiment of this invention. It is a figure which shows the example of the seamless switching operation | movement which concerns on embodiment of this invention. It is a figure which shows the example of the seamless switching operation | movement which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 shows the configuration of a radio broadcast system according to this embodiment.
As shown in the figure, the radio broadcast receiver 1 is a radio broadcast receiver 1 whose position varies, such as a radio broadcast receiver mounted on an automobile or a portable radio broadcast receiver.
The radio broadcast receiver 1 receives from the radio broadcast station 2 digital radio broadcasts according to broadcast standards such as DAB and DAB +, and analog radio broadcasts such as FM radio broadcasts. The radio broadcast receiver 1 connects to the WAN 3 such as the Internet via mobile communication and receives the IP radio broadcast from the IP radio server 4 on the WAN 3.

  Here, the IP radio broadcast performed by the IP radio server 4 is an IP radio broadcast having a relationship between a digital radio broadcast or an analog radio broadcast and a simulcast, that is, a broadcast having the same contents as the digital radio broadcast or the analog radio broadcast. IP radio broadcasts are included.

  In this embodiment, audio received from an IP radio broadcast that is in a relationship between a digital radio broadcast or an analog radio broadcast and a simulcast is always a digital radio broadcast or an analog radio in which the IP radio broadcast is in a simulcast relationship. Assume that the audio is delayed from the broadcasted audio.

Next, FIG. 2 shows a configuration of the radio broadcast receiver 1.
As shown in the figure, a radio broadcast receiver 1 receives a digital radio broadcast, reproduces and outputs the received audio data, a digital radio tuner 101, receives an analog radio broadcast, and digitally converts the audio received by the analog radio broadcast, An analog radio tuner 102 that outputs audio data and an IP radio player 103 that receives IP radio broadcast and outputs received audio data are provided.

  Here, the IP radio player 103 is connected to the IP radio server 4 on the WAN 3 via the mobile communication device 104 that performs mobile communication, receives the audio stream distributed by the IP radio server 4 by IP radio broadcast, Play and output audio data. However, the radio broadcast receiver 1 is provided with an external interface 105 for connecting the mobile phone 5 that performs mobile communication instead of including the mobile communication device 104, and the IP radio player 103 performs mobile communication performed by the mobile phone 5 via mobile communication. It may be configured to connect to the IP radio server 4 on the WAN 3 so as to receive, reproduce and output an audio stream distributed by the IP radio server 4 through IP radio broadcasting.

The radio broadcast receiver 1 includes an input device 106, a display device 107, and a control unit 108.
The radio broadcast receiver 1 also delays the audio data output from the digital radio tuner 101 or the analog radio tuner 102 by a set delay target time and outputs the delayed data 109 from the digital radio tuner 101. A selector 110 that selects and outputs one of data, audio data output from the analog radio tuner 102, audio data output from the delay unit 109, and audio data output from the IP radio player 103, and output from the selector 110 A DA converter 111 that converts audio data into an analog audio signal and outputs it, an amplifier 112 that amplifies the analog audio signal output from the DA converter 111, and a speaker 113 that is driven by the amplified audio signal and outputs audio. To have.

The radio broadcast receiver 1 includes a tuner memory 114, a player memory 115, and a comparison unit 116.
In such a configuration, when the control unit 108 is instructed to receive a radio broadcast of a specific radio broadcast station 2 from the user via the input device 106, the radio broadcast station 2 instructed to receive the digital radio station 2 If it is a broadcast station, the digital radio tuner 101 is the active tuner, and if the radio broadcast station 2 instructed to receive is an analog radio broadcast station, the analog radio tuner 102 is the active tuner and the active tuner receives the signal. Reception of the radio broadcast of the instructed radio broadcast station 2 and output of audio data are started. Further, the control unit 108 clears the stored contents of the tuner memory 114 and the player memory 115, and sets 0 as the delay target time in the delay unit 109, whereby the audio data input from the current tuner is input to the delay unit 109. The selector 110 is output without delay. Then, the control unit 108 causes the selector 110 to output the audio data input from the delay unit 109 to the DA conversion unit 111, so that the audio received from the radio broadcast station 2 instructed to be received from the user by the active tuner is output to the speaker. 113 to output.

  On the other hand, audio data output from the current tuner is stored in the tuner memory 114. Here, the storage in the tuner memory 114 is always performed so that the latest audio data for a predetermined reproduction time is stored in the tuner memory 114. The amount of audio data that is always stored in the tuner memory 114 is such that the playback time of the audio data in the tuner memory 114 is an IP that has a relationship between the digital / analog radio broadcast and the simulcast for the digital / analog radio broadcast. It is set to be longer than the time expected as the maximum delay time of radio broadcasting.

  In addition, the control unit 108 outputs the sound output to the speaker 113 between the sound being received by the current tuner and the sound received by the IP radio broadcast having a relationship between the radio broadcast being received by the current tuner and the simulcast. Performs seamless switching.

Hereinafter, seamless switching processing performed by the control unit 108 for such seamless switching will be described.
FIG. 3 shows the procedure of the seamless switching process. The seamless switching process is started when the user gives an instruction to receive a radio broadcast from a specific radio broadcast station 2.
As shown in the figure, in this process, the state of the radio broadcast receiver 1 waits until the sound received by the active tuner output from the delay unit 109 is output from the speaker 113 (step 302). If the sound output from the unit 109 is being output from the speaker 113, the deterioration of the reception quality of the radio broadcast being received by the active tuner is monitored (step 304). Here, the reception quality of the radio broadcast being received by the current tuner is the reception quality of the radio broadcast being received by the digital radio tuner 101 or the analog tuner that is the current tuner, the received electric field strength of the radio broadcast being received, The control unit 108 obtains the reception quality calculated in the current tuner by calculating from the SN ratio, error rate, and the like.

  Next, if the reception quality of the radio broadcast being received deteriorates, the IP radio player 103 is controlled to start reception of the IP radio broadcast having a relationship between the radio broadcast being received and the simulcast (step 306).

  If reception of the IP radio broadcast by the IP radio player 103 is started (step 308), the delay time of the voice received by the IP radio broadcast is calculated with respect to the voice received by the radio broadcast being received by the current tuner. (Step 310).

Here, the delay time is calculated as follows.
In other words, the control unit 108 stops the audio data storage operation in the tuner memory 114, and controls so that the stored content of the audio data in the tuner memory 114 does not change from that point.

  In addition, the control unit 108 causes the player memory 115 to store audio data for a predetermined reproduction time received first in the IP radio broadcast output from the IP radio player 103.

  The control unit 108 also compares the audio data stored in the tuner memory 114 with the comparison unit 116 and the audio data stored in the tuner memory 114 by comparing the audio data stored in the player memory 115. A search is made for a portion of the data where the audio pattern matches the audio data stored in the player memory 115. Then, the difference between the reception time of the audio data stored in the player memory 115 and the reception time of the portion of the searched audio data stored in the tuner memory 114 is calculated as a delay time. The reception time of the portion of the audio data stored in the searched tuner memory 114 can be obtained from the position of the searched portion of the audio data stored in the tuner memory 114 in the continuum.

Next, the delay time calculated in step 310 is set in the delay unit 109 as the target delay time (step 312).
Here, the delay unit 109 to which the delay target time is set outputs the time stretch until the set delay target time and the delay time for the audio data output from the current tuner of the audio data output from the delay unit 109 match. Perform the action.

  Here, the time stretch output operation means that when the set delay target time is larger than the delay time of the audio data output from the delay unit 109 at that time, the set delay target time and the delay unit 109 Until the delay time of the output audio data matches that of the audio data output by the current tuner, the audio data is expanded and output in the time axis direction while maintaining the pitch, and the set delay target time is When the delay time is smaller than the delay time of the audio data output from the delay unit 109, the set delay target time and the delay time for the audio data output from the current tuner of the audio data output from the delay unit 109 match. Operation to reduce and output audio data in the time axis direction while maintaining the pitch A. Note that the audio data is time stretched so that the length of the audio data in the time axis direction does not change by more than a predetermined length (for example, 20% of the original length) with respect to the original length.

  If the set delay target time and the delay time of the audio data output from the delay unit 109 match, the delay unit 109 ends the time stretch output operation and outputs audio data at a normal playback speed. At the same time, the control unit 108 reports the coincidence of delay times.

  On the other hand, if the delay time (delay target time) calculated in step 310 matches the delay time of the audio data output from the delay unit 109, the control unit 108 reports that the delay time coincides with the delay unit 109. (Step 314) The sound output to the speaker 113 is switched to the sound received by the IP radio player 103 from the IP radio broadcast (step 316). Here, at this time, the delay unit 109 delays and outputs the audio data received by the radio broadcast by the delay time of the audio data received by the IP radio broadcast with respect to the audio data received by the radio broadcast. Therefore, by switching the audio data output from the selector 110, the audio data output from the speaker 113 is seamlessly switched from audio data received by radio broadcasting to audio data output by the IP radio player 103.

  If the output of the audio received by the IP radio player 103 from the IP radio broadcast from the speaker 113 is started in this manner, the reception quality of the radio broadcast being received by the active tuner returns to a good reception quality. (Step 318), and when the reception quality returns to a good reception quality, the audio data output from the selector 110 to the DA conversion unit 111 is switched to the audio data output from the delay unit 109, thereby the speaker. The sound output to 113 is switched to the sound of the radio broadcast being received by the current tuner (step 320). At this time, the delay unit 109 delays and outputs the audio data received by the radio broadcast by the delay time of the audio data received by the IP radio broadcast with respect to the audio data received by the radio broadcast. By switching the audio data output from the selector 110, the audio data output from the speaker 113 is seamlessly switched from the audio data output from the IP radio player 103 to the audio data received by radio broadcasting.

  Then, the storing operation of the audio data in the tuner memory 114 is restarted, and the IP radio player 103 is stopped from receiving the IP radio broadcast (step 322), and the process returns to step 304. Here, the IP radio player 103 disconnects the mobile communication of the mobile communication device 104 or the mobile phone 5 when stopping the reception of the IP radio broadcast.

The seamless switching process performed by the control unit 108 has been described above.
It should be noted that the seamless switching process as described above ends when an instruction to end reception of the radio broadcast is given by the user. Also, the seamless switching process as described above is restarted when the user is instructed to receive a new radio broadcast.

Next, the notification voice output control process performed by the control unit 108 will be described.
Here, in the notification voice output control process, the delay unit 109 performs the time stretch output operation described above, using the voice that notifies a predetermined type of information such as traffic information, caution information, and disaster information as notification voice. When the current tuner receives the notification sound during the period, the received notification sound is output from the speaker 113 without delay, and the output of the notification sound is prevented from being repeatedly output. This is a process performed for this purpose.

FIG. 4 shows the procedure of the notification sound output control process.
As shown in the figure, in this announcement sound output control process, the control unit 108 outputs the sound of the radio broadcast being received by the active tuner output from the delay unit 109 from the speaker 113 (step 402), and the delay. During the period in which the unit 109 is performing the time stretch output operation (step 404), the start of notification voice reception at the active tuner is monitored (step 406).

  Here, if the analog radio broadcast is an audio data multiplex broadcast in which data is multiplexed with audio and broadcasted, the announcement audio is being broadcast by the multiplexed data. For example, in the case of RDS, which is one of audio data multiplex broadcasts, the notification voice is being broadcast by the value of PTY and TA in the broadcast data frame (group). In digital radio broadcasting, the announcement voice is being broadcast based on the broadcast data. For example, in the case of DAB which is one of digital radio broadcasts, the announcement voice is being broadcast by the values of FIC, FIB and FIG. In the broadcast data frame.

  Then, the control unit 108 receives a notification from the active tuner whether or not the announcement voice is being broadcasted in the received radio broadcast, and starts receiving the announcement voice in the active tuner according to the notification. During reception, the end of reception is determined.

  Next, when reception of the announcement voice in the current tuner is started (step 406), the control unit 108 switches the audio data output from the selector 110 to the DA converter 111 to the audio data output from the current tuner. The sound output to the speaker 113 is switched to the sound received by the current tuner and not delayed by the delay unit 109 (step 408).

Next, the suspension of the time stretch output operation of the delay unit 109 is controlled (step 410), and the end of reception of the notification voice in the current tuner is awaited (step 412).
Then, when reception of the notification voice in the current tuner is completed (step 412), the restart of the time stretch output operation of the delay unit 109 is controlled (step 414).
Here, the delay unit 109, which is controlled to pause the time stretch output operation, stops the operation to time stretch and output the input audio data until the restart of the time stretch output operation is controlled. If the restart of the operation is controlled, the operation of time-stretching and outputting the audio data subsequent to the already output audio data is started.

Then, the audio data output from the selector 110 to the audio data output from the delay unit 109 is switched to the audio data output from the delay unit 109, so that the audio output to the speaker 113 is received by the current tuner and is converted into the audio delayed by the delay unit 109. Return (step 416)
Further, the period during which the notification voice is received by the active tuner is set in the delay unit 109 as the skip voice period (step 418).

Then, the process returns to step 402.
Here, the delay unit 109 in which the skip voice period is set excludes the audio data received by the current tuner during the skip voice period from the audio data output by time stretching, and the audio received by the current tuner before the skip voice period. If the data time stretch is output, the audio data time stretched received by the current tuner after the skip voice period is output.

The notification voice output control process has been described above.
Hereinafter, an example of the seamless switching operation by the seamless switching process and the notification voice output control process as described above will be described.
FIG. 5 shows a first seamless switching operation example.
Here, the first seamless switching operation example is an operation example in the case where notification voice is not received in the active tuner during the time stretch output operation of the delay unit 109.
Now, in FIG. 5, each square enclosing a number represents a unit time of audio data and sound, with a reproduction time of a predetermined time length as a unit time. In addition, a rectangle surrounding a number without “′” indicates audio data and sound received by the current tuner through radio broadcasting (digital radio broadcasting or analog radio broadcasting), and a rectangle surrounding the number with “′” indicates an IP radio player. Reference numeral 103 denotes audio data and voice received by IP radio radio broadcasting. In addition, squares having the same numerical value in each square (for example, “4” and “4 ′”) represent audio data and voice having the same contents. The tuner memory 114 is assumed to store audio data for five unit times.

  Now, assuming that 0 is set as the delay target time in the delay unit 109 at time T0, the selector during the period in which the current tuner receives radio broadcasts with good reception quality from time T0 to time T1. 110 is set to output the audio data output from the delay unit 109 to the DA conversion unit 111, and the audio data (0-3) received by the current tuner from the radio broadcast is received by the delay unit 109. The signal is output from the speaker 113 via the selector 110, the DA converter 111, and the amplifier 112 without being delayed. Also, the audio data (0-3) sequentially output by the current tuner is sequentially stored in the tuner memory 114, and eventually the tuner memory 114 always stores audio data for five unit time lengths. Become.

  In this state, when the deterioration of the reception quality of the radio broadcast is detected at time T1, the reception operation of the IP radio broadcast having the relationship between the radio broadcast being received by the current tuner and the simulcast is started in the IP radio player 103. . Then, reception of IP radio broadcast audio data is started at time T2 when preparation processing for reception of the IP radio broadcast is completed. On the other hand, the audio data (4-5) received from the radio broadcast by the current tuner from time T1 to time T2 is not delayed by the delay unit 109, but is sent to the selector 110, the DA conversion unit 111, and the amplifier 112. And the audio data (4-5) are sequentially stored in the tuner memory 114.

  When reception of IP radio broadcast audio data is started at time T2, storage of the audio data in the tuner memory 114 is stopped, and the stored contents in the tuner memory 114 are frozen. Also, the audio data (3 ′) received first in the IP radio broadcast is stored in the player memory 115.

  When reception of IP radio broadcast audio data is started at time T2, a search is started in the comparison unit 116, and audio data (1-5 stored in the tuner memory 114 at time T2-T3). ) Is searched for audio data having the same sound pattern as the audio data (3 ′) in the player memory 115, and the audio data (3) stored in the tuner memory 114 of the searched audio data (3) is searched. The delay time of the audio data received by the IP radio broadcast relative to the audio data received by the radio broadcast is calculated from the reception time of the searched audio data (3) obtained from the storage position in the continuum of 1-5). Here, at time T2-T3, the audio data (3 ′) in the player memory 115 matches the audio data (3) in the tuner memory 114, and 3 unit time is calculated as the delay time.

On the other hand, between time T2 and time T3, the audio data (6-7) received from the radio broadcast by the active tuner is not delayed by the delay unit 109 but passes through the selector 110, the DA conversion unit 111, and the amplifier 112. If the delay time is calculated at time T3, the calculated delay time is set in the delay unit 109 as the delay target time. Since the set delay target time is larger than the delay time 0 at this time, the delay unit 109 performs time stretch output operation for expanding and outputting the audio data input from the current tuner in the time axis direction while maintaining the pitch. Start. Then, audio data (8-10) expanded in the time axis direction is sequentially output from the speaker 113 via the selector 110, the DA converter 111, and the amplifier 112.

  Then, at time T4 when the output of the audio data (10) expanded in the time axis direction is completed, the delay time of the audio data output from the delay unit 109 with respect to the audio data output from the current tuner is set to the set delay target time. If they match, the audio data output from the selector 110 to the DA converter 111 is switched from the audio data output from the delay unit 109 to the audio data output from the IP radio player 103. As a result, the sound output from the speaker 113 is switched from the sound received by the current tuner through radio broadcasting to the sound received through IP radio broadcasting, and the audio data (11′-14 ′) output from the IP radio player 103 is selected by the selector 110. The signal is output from the speaker 113 via the DA converter 111 and the amplifier 112.

  Here, at time T4, the delay unit 109 receives the audio data received by the current tuner in the radio broadcast for the delay time of the audio data received in the IP radio broadcast relative to the audio data received in the radio broadcast received by the current tuner. Since the data is delayed and output, the sound output from the speaker 113 is changed from the sound of the audio data received by the current tuner through radio broadcasting to the sound of the audio data output by the IP radio player 103. Switch seamlessly.

  In addition, at time T4 when the output of the audio data (10) expanded in the time axis direction is completed, the time stretch output operation of the delay unit 109 ends, and after time T4, the delay unit 109 performs normal playback speed, The audio data (11-14) received by the current tuner from the radio broadcast is output.

  Here, the delay unit 109 includes a FIFO buffer, and when the delay target time is set to 0 or more, the audio data is extracted from the buffer while the input audio data is stored in the buffer. Then, time-stretching is performed as in audio data (8-10) or output without time-stretching as in audio data (11-14). Note that the bold audio data in the buffer in the figure represents the audio data being output by the delay unit 109.

  Although not shown, when the reception quality of the current tuner returns to a good reception quality, the audio data output from the selector 110 to the DA converter 111 is delayed from the audio data output from the IP radio player 103. The audio data is switched to the audio data output from the unit 109, and the audio is delayed by the delay time of the audio data received by the IP radio broadcast relative to the audio data received by the delay unit 109 from the radio broadcast and received by the delay unit 109. Data is output from the speaker 113 via the selector 110, DA converter 111, and amplifier 112. Here, at the time of this switching, the delay unit 109 delays and outputs the audio data received by the radio broadcast by the delay time of the audio data received by the IP radio broadcast with respect to the audio data received by the radio broadcast. Therefore, the audio data output from the speaker 113 is seamlessly switched from the audio data output from the IP radio player 103 to the audio data received by radio broadcasting.

Heretofore, the first seamless switching operation example has been described.
Next, FIG. 6 shows a second seamless switching operation example.
Here, the second seamless switching operation example is an operation example when notification voice is received in the current tuner during the time stretch output operation of the delay unit 109.
As shown in the figure, the operation up to time T3 in the second seamless switching operation example is the same as the operation up to time T3 in which the delay time is calculated in the first seamless switching operation example shown in FIG. In FIG. 6, black squares indicate the audio data and voice of the announcement voice received from the radio broadcast being received by the current tuner.

  When the delay time is calculated at time T3, the calculated delay time is set in the delay unit 109 as the delay target time. Since the set delay target time is larger than the delay time 0 at this time, the delay unit 109 performs time stretch output operation for expanding and outputting the audio data input from the current tuner in the time axis direction while maintaining the pitch. Start. Then, at time T31 when the audio data expanded in the time axis direction is output from the speaker 113 via the selector 110, the DA converter 111, and the amplifier 112, the current tuner starts to receive the notification voice. The audio data output by the 110 to the DA converter 111 is switched to the audio data output by the current tuner, and the audio data (10) of the announcement voice from the current tuner is transmitted without delay to the speaker 113 via the DA converter 111 and the amplifier 112. Is output from.

Further, when the current tuner starts to receive the notification voice at time T31, the time stretch output operation of the delay unit 109 is temporarily stopped.
Then, when reception of the notification voice of the current tuner is completed at time T32, a period during which the current tuner has received the audio data (10) with the notification voice is set in the delay unit 109 as a skip voice period.

  When the reception of the notification voice of the current tuner is completed at time T32, the audio data output from the selector 110 to the DA converter 111 is restored to the audio data output from the delay unit 109, and the time stretch of the delay unit 109 is performed. The output operation is resumed.

  The delay unit 109 that has restarted the time stretch output operation time-stretches the audio data (9) subsequent to the audio data (8) that has already been output, expands it in the time axis direction, and outputs it. Next, since the audio data (10) next to the audio data (9) is the audio data received by the current tuner during the set skip voice period, the audio data (10) is selected from the target of the time stretch output operation. The audio data (10) and the next audio data (11) are time-stretched and expanded in the time axis direction for output.

  Then, at the time T4 when the output of the audio data (11) expanded in the time axis direction is completed, the delay time of the audio data output from the delay unit 109 with respect to the audio data input to the delay unit 109 is the set delay target time The audio data output from the selector 110 to the DA converter 111 is switched from the audio data output from the delay unit 109 to the audio data output from the IP radio player 103. As a result, the sound output from the speaker 113 is switched from the sound received by the active tuner through radio broadcasting to the sound received through IP radio broadcasting, and the audio data (12′-14 ′) output from the IP radio player 103 is selected by the selector 110. The signal is output from the speaker 113 via the DA converter 111 and the amplifier 112.

  Here, at time T4, the delay unit 109 receives the audio data received by the current tuner in the radio broadcast for the delay time of the audio data received in the IP radio broadcast relative to the audio data received in the radio broadcast received by the current tuner. Since the data is delayed and output, audio data output from the speaker 113 is seamlessly switched from audio data received by radio broadcasting to audio data output by the IP radio player 103.

  Also, at time T4 when the output of the audio data (11) expanded in the time axis direction is completed, the time stretch output operation of the delay unit 109 ends, and after time T4, the delay unit 109 performs normal playback speed, The audio data (11-14) received by the current tuner from the radio broadcast is output.

The second seamless switching operation example has been described above.
Here, in the second seamless switching operation example shown in FIG. 6, in the time stretch output operation of the delay unit 109, the audio data (10) received by the current tuner during the skip voice period, that is, the audio of the announcement voice When the data (10) is output without being excluded from the target of the time stretch output operation, the audio data (10) is output from the delay unit 109 instead of the audio data (11). Audio (10) will be output twice.

  On the other hand, according to the present embodiment, as shown in FIG. 6, the audio data (10) received by the current tuner during the skip voice period, that is, the audio data (10) of the announcement voice is the target of the time stretch output operation. Therefore, it is excluded that the audio (10) received with the announcement voice is output twice.

  In the present embodiment, the time shift output operation of the delay unit 109 is temporarily stopped during the period T31-T32 in which the audio data (10) of the announcement voice is output without delay, and the audio data (10) of the announcement voice is temporarily stopped. Since the time shift output operation of the delay unit 109 is restarted from T32 when the reception is completed, the delay time of the audio data output from the delay unit 109 is increased more quickly than when the pause is not performed. As a result, it is possible to complete seamless switching of output audio to audio received via IP radio broadcasting more quickly.

The embodiment of the present invention has been described above.
In the radio broadcast receiver 1 according to the above embodiment, the active tuner outputs the audio data output from the delay unit 109 from the speaker 113, and the delay unit 109 performs the time stretch output operation. For example, the output of the voice received by the current tuner with the announcement voice during the absence period is performed as follows. That is, when 0 is set as the delay target time in the delay unit 109, the output of the audio data output from the delay unit 109 from the speaker 113 is continued as it is. On the other hand, when 0 is not set as the delay target time in the delay unit 109, the audio data to be output is switched to the audio data output by the current tuner during the period in which the notification voice is received, and the notification voice is received. If completed, the audio data to be output is restored to the audio data output by the delay unit 109. Also, the audio data of the announcement voice is set as the skip target audio data in the delay unit 109, and the delay unit 109 excludes the audio data set as the skip target audio data from the output target, and before the skip target audio data. By performing time stretching that expands the audio data in the time axis direction and outputting it, if the output period of the previous audio data is not set as skip target audio data, the skip target audio data is output Expand to the end of the period that was supposed to be. Then, after the output of the previous audio data, the audio data after the skip target audio data is sequentially output without time stretching.

  Further, the radio broadcast receiver 1 according to the above-described embodiment is configured so that the active tuner is operating during the time stretch output operation period of the delay unit 109 prior to the period during which the audio data output from the IP radio player 103 is being output. May be configured so that the audio data is not output from the speaker 113 when the IP radio player 103 receives from the IP radio broadcast the same audio data as the notification voice audio data received and output to the speaker 113.

  That is, in this case, the radio broadcast receiver 1 is subjected to time stretch that expands the audio data output from the IP radio player 103 in the time axis direction, or the stretch that is output to the selector 110 without performing time stretch. The output of the stretch unit is used as the input of the selector 110 instead of the output of the IP radio player 103.

  Then, as shown in FIG. 7 as an example, the control unit 108 receives the audio data (13) of the notification voice during the time stretch output operation period (T3-T4) of the delay unit 109 (T31-T). A period (T41-T42) obtained by delaying T32) by the delay target time (4 unit time) calculated at time T3 and set in the delay unit 109 is set as a skip period in the stretch unit. Then, the stretch unit excludes the audio data (13 ′) output from the IP radio player 103 during the skip period (T41-T42) from the output target to the selector 110, and excludes the audio data (13 ′) from the output target from the IP radio player 103. The audio data (12 ′) output in the previous period of the audio data (13 ′) is output by performing time stretching that expands in the time axis direction, so that the output period of the previous audio data (12 ′) is increased. The image is expanded until the end of the skip period (T42). After the previous audio data is output, the audio data (14 ′...) Output from the IP radio player 103 and excluded from the output target is sequentially output without time stretching. . Note that the stretch unit outputs audio data output from the IP radio player 103 except for a period in which the audio data output before the audio data (13 ′) excluded from the output target is output by (12 ′) time stretching. (2'-11 ', 14' ...) is output without being time-stretched.

  In addition, the radio broadcast receiver 1 according to the above embodiment receives a broadcast of an arbitrary broadcast system or broadcast medium having a relationship between digital radio broadcast, analog radio broadcast and simulcast instead of the IP radio player 103. You may make it provide the receiver to do. In this case, similarly to the audio data output from the IP radio player 103, the audio data output from the receiver provided in place of the IP radio player 103 is processed.

  DESCRIPTION OF SYMBOLS 1 ... Radio broadcast receiver, 2 ... Radio broadcast station, 3 ... WAN, 4 ... IP radio server, 7 ... Mobile phone, 101 ... Digital radio tuner, 102 ... Analog radio tuner, 103 ... IP radio player, 104 ... Mobile communication Device ... 105 ... external interface 106 ... input device 107 ... display device 108 ... control unit 109 ... delay unit 110 ... selector 111 ... DA converter 112 ... amplifier 113 ... speaker 114 ... memory for tuner 115: Memory for player 116: Comparison unit.

Claims (7)

A radio broadcast receiver capable of receiving a radio broadcast and a parallel broadcast that is a broadcast that transmits audio having the same content as the radio broadcast with a delay relative to the radio broadcast,
A radio receiver that receives radio broadcasts and outputs the received audio;
A parallel broadcast receiving unit that receives the parallel broadcast and outputs the received audio;
Delay means with variable delay time for delaying and outputting the sound output by the radio receiver;
An output selection unit that selects one of the audio output from the radio reception unit, the audio output from the parallel broadcast reception unit, and the audio output from the delay unit and outputs the selected audio to the user;
A control unit,
The delay means is arranged in the time axis direction to the sound output by the radio reception section until the delay time of the sound output by the delay means with respect to the sound output by the radio reception section matches a set delay target time. Perform time-stretch output operation to output by applying time stretch to expand the sound,
The control unit switches the sound output to the user from the sound received by the radio receiving unit output by the delay unit to the sound received by the parallel broadcast receiving unit. Calculating the delay time of the sound output by the parallel broadcast receiver for the output sound, setting the calculated delay time as the delay target time in the delay means, causing the delay means to execute the time stretch output operation, When the time stretch output operation is completed, the output selection unit switches the sound output to the user from the sound output by the delay unit to the sound output by the parallel broadcast receiving unit,
During the period when the delay means is performing the time stretch output operation, when receiving a notification voice that is a voice for notifying a predetermined type of information in the radio broadcast, during the reception period of the notification voice, The output selection unit is caused to select the sound output by the radio reception unit as the sound to be output to the user, and at the end of the notification sound reception period, the output selection unit outputs the sound to be output to the user. In addition to returning to the sound output from the delay means, in the time stretch output operation, the notification sound is excluded from the sound output by performing time stretching, and the radio reception unit receives the sound received before the notification sound. Next, the delay means is controlled so that a voice received after the announcement voice is subjected to time stretching and output. Radio broadcast receiver. The radio broadcast receiver according to claim 1,
The radio broadcast receiving apparatus, wherein the control unit causes the delay means to temporarily stop the time stretch output operation during the reception period of the notification voice. The radio broadcast receiver according to claim 1 or 2,
The radio broadcast receiving apparatus according to claim 1, wherein the notification sound is a sound for notifying traffic information, caution information, or disaster information. A radio broadcast receiver according to claim 3,
A time stretch means for performing time stretch to selectively expand the sound in the time axis direction to the sound of the parallel broadcast receiving unit to be output to the output selection unit;
The control unit, when the delay means is performing the time stretch output operation, when the radio reception unit receives the notification sound by radio broadcast, the parallel broadcast reception unit is the same as the notification sound After the voice received before the voice, the voice received by the parallel broadcast receiver after receiving the same voice as the announcement voice is output to the output selector as the voice output by the parallel broadcast. In addition, the radio is characterized in that the time stretch means is controlled so that the parallel broadcast receiving unit performs time stretch to expand the sound in the time axis direction to the sound received before the same sound as the announcement sound. Broadcast receiving device. The radio broadcast receiver according to claim 1, 2, 3 or 4,
The parallel broadcasting is IP radio broadcasting,
The parallel broadcast receiving unit is an IP radio player that receives an IP radio broadcast and outputs the received sound. The radio broadcast receiver according to claim 1, 2, 3, 4 or 5,
The radio broadcast receiving apparatus, wherein the radio broadcast is at least one of a digital radio broadcast and an analog radio broadcast. The radio broadcast receiver according to claim 1, 2, 3, 4, 5 or 6,
The radio broadcast receiving apparatus is an in-vehicle radio broadcast receiving apparatus mounted on an automobile.