JP2016213696A - Radio broadcast reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide "a radio broadcast reception system" capable of shortening the reception period of IP radio broadcast, when performing seamless switching between reception voices received by radio broadcast and IP radio broadcast in the relationship of simultaneous broadcasting.SOLUTION: A point where radio broadcast is unreceivable is registered. When the prediction time until arrival at the registered point goes below a predetermined threshold Th, while outputting the reception voice of radio broadcast, mobile communication is started, and reception of IP radio broadcast is started. Delay time of the IP radio broadcast for the radio broadcast is calculated by comparing the reception voice of radio broadcast with the recent reception voice of IP radio broadcast, and after delaying the radio broadcast by the delay time thus calculated, the voice to be outputted is switched from the reception voice of radio broadcast to the recent reception voice of IP radio broadcast.SELECTED DRAWING: Figure 1

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 system.

  In a radio broadcast receiving system, 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 When switching the audio to be output, the delay time of the audio received by IP radio broadcasting relative to the audio received by FM broadcasting is calculated, and the audio received by FM broadcasting is calculated by time stretching that expands the audio in the time axis direction After delaying the delay time, the output sound is seamlessly switched from the sound received by FM broadcasting to the sound received by IP radio broadcasting. That technique is known (e.g., Patent Document 1).

  Here, in this technique, the voice received by the FM broadcast having a large correlation with the part of the voice recently received by the IP radio broadcast is compared between the voice received by the IP radio broadcast and the voice received by the FM broadcast. The difference in the reception time between the audio part recently received in the IP radio broadcast and the calculated audio part in the audio received in the FM broadcast was received in the IP radio broadcast for the audio received in the FM broadcast. It is calculated as the audio delay time.

  In addition, the audio that is output from the broadcast that is outputting the received audio to the received audio of another broadcast that is broadcasting the same content as the broadcast (the broadcast that is receiving the received audio and the simulcast) As a technology for switching between radio broadcasts and radio broadcast receivers that receive radio broadcasts and broadcasts distributed via mobile communication networks, which are related to radio broadcasts and simulcasts, Technology that starts receiving broadcasts distributed via a mobile communication network and switches output audio to broadcast audio distributed via a mobile communication network when reception quality deteriorates below a predetermined reference value Is also known (for example, Patent Document 2).

JP 2013-201469 A JP 2003-169380 A

  When switching the sound to be output from the sound received by the FM broadcast to the sound received by the IP radio broadcast, the delay time of the sound received by the IP radio broadcast relative to the sound received by the FM broadcast is calculated and received by the FM broadcast. In the technology for seamlessly switching the output sound from the sound received by FM broadcast to the sound received by IP radio broadcast after delaying the delay time calculated by time stretch that expands the sound in the time axis direction When switching the output sound from the sound received by broadcast to the sound received by IP radio broadcast when the reception quality of the FM broadcast being received is deteriorated from a predetermined reference value, there are the following problems.

  That is, in this case, as the reference value of the reception quality of the FM broadcast being received that is to be switched, the FM broadcast sound to be output before the switching of the output sound is incapable of receiving the FM broadcast reception quality. It is necessary to set a value that guarantees that the signal cannot be received due to a drop to a certain level and seamless switching is not possible. When the reference value of the FM broadcast reception quality is set in this way, the period for receiving the IP radio broadcast is more prominent than the period for delivering the same audio as the voice that cannot be received from the FM broadcast. May be prolonged.

  In addition, after reception quality has deteriorated, the reception quality does not decrease to an unreceivable level and the reception quality returns to good reception quality, that is, the sound received by IP radio broadcasting from the sound received by FM broadcasting. Even when there is no need to switch the audio to be output to the IP radio broadcast reception period occurs.

As a result, when the IP radio broadcast reception is accompanied by a cost burden, the user is forced to bear an unnecessary cost burden.
Therefore, the present invention changes the sound received from the radio broadcast to the sound received from the IP radio broadcast that has the same content as the radio broadcast when the radio broadcast being received cannot be received. An object of the present invention is to shorten an IP radio broadcast reception period in a radio broadcast reception system that performs seamless switching of audio output to a user.

  In order to achieve the above object, the present invention is capable of receiving a radio broadcast and an IP radio broadcast that has a relationship between the radio broadcast and the simulcast and transmits the same content as the radio broadcast with a delay relative to the radio broadcast. A radio receiver for receiving a radio broadcast, an IP radio player for receiving the IP radio broadcast via mobile communication, a received sound of the radio receiver, and a received sound of the IP radio player An output selection unit that outputs one of the two received voices to be input to the user, and a delay unit that delays the reception voice of the radio reception unit that is input to the output selection unit And the IP radio player receives the IP radio broadcast in a relationship between the radio broadcast received by the radio receiver and the simulcast. Starting reception via mobile communication, delaying the reception voice of the radio reception unit to be input to the output selection unit by the delay means for the delay time of the IP radio broadcast with respect to the radio broadcast, A control unit that performs a switching operation for causing the output selection unit to switch the reception sound output to the user from the reception sound of the radio reception unit to the reception sound of the IP radio player; and the radio reception unit The information acquisition means for acquiring the reception impossible point information where the point where the reception state of the radio broadcast is changed to the reception impossible state is registered, and the current position calculation means for calculating the current position are provided. However, the control unit determines the degree of approach of the current position calculated by the current position calculation unit to the point registered in the reception-disabled point information acquired by the information acquisition unit. It starts when it reaches a predetermined level.

  Here, the radio broadcast receiving system includes an information holding means for holding the reception impossible point information provided corresponding to each radio broadcast in the radio broadcast receiving system, and a radio being received by the radio receiving unit. When the reception state of the broadcast changes to a reception-disabled state, the information holding unit holds the point that the current position calculation unit calculates as the current position, and the radio reception unit is receiving the radio broadcast being received Registration means for registering in the corresponding unreceivable point information, and in the information acquisition unit, the unreceivable point information corresponding to the radio broadcast being received by the radio reception unit is acquired from the information holding unit. You may comprise.

  Alternatively, the radio broadcast receiving system corresponds to each radio broadcast via mobile communication when the reception state of the radio broadcast being received by the radio reception unit is changed to an unreceivable state. The radio receiving unit connected to the information server holding the incapable reception point information provided by the information server and holding the point calculated by the current position calculation means as the current position Is provided with registration means for registering in the information on the reception failure occurrence point corresponding to the radio broadcast being received, connected to the information server via mobile communication in the information acquisition means, and the radio broadcast received by the radio reception unit It may be configured such that the reception-disabled occurrence point information corresponding to is acquired from the information server.

  The radio broadcast receiving system described above corresponds to the radio broadcast being received by the radio receiving unit when the reception state of the radio broadcast being received by the radio receiving unit is changed to an unreceivable state in the registration unit. In the unreceivable point information, the moving direction of the current position is registered together with the point calculated by the current position calculating unit as the current position, and the unacceptable point information acquired by the information acquiring unit in the control unit The degree of approach of the current position to a point that is registered with the point that is expected to pass in the moving direction registered in the unreceivable point information together with the point is the predetermined level. It may be configured to start the switching operation when the time is reached.

  In the radio broadcast receiving system described above, the estimated value of the time required to reach the point registered in the unreceivable point information acquired by the information acquisition unit is within a predetermined time in the control unit. In some cases, it is preferable to determine that the degree of approach of the current position has reached the predetermined level and start the switching operation. In this case, it is preferable that the predetermined time is a time expected as a maximum value of the time required for the switching operation or a time obtained by adding a predetermined margin to the time.

In the above radio broadcast receiving system, the radio broadcast may be at least one or both of a digital radio broadcast and an analog radio broadcast.
Further, the above radio broadcast receiving system may be an in-vehicle radio broadcast receiving system mounted on an automobile.
As described above, according to the radio broadcast receiving system of the present invention, the degree of approach to the point where the reception state of the radio broadcast received by the radio reception unit changes to the unreceivable state becomes a predetermined level. When this happens, reception of the IP radio broadcast is started, and thereafter, the output sound is seamlessly switched from the reception sound of the radio broadcast to the reception sound of the IP radio broadcast.

  Therefore, by appropriately setting the predetermined level, it is impossible to receive radio broadcasts, and it is impossible to seamlessly switch output audio from radio broadcasts to IP radio broadcasts. The radio broadcast receiving system can be configured to start receiving the IP radio broadcast from a time point at which it is necessary to start reception of the radio broadcast at a minimum or a time point near the time before the time point. The reception period of radio broadcasting can be shortened.

  As described above, according to the present invention, when a radio broadcast that is being received cannot be received, it is received from an IP radio broadcast that is broadcasting the same content as the radio broadcast from the sound received by the radio broadcast. In the radio broadcast receiving system that seamlessly switches the audio output to the user to the existing audio, the reception period of the IP radio broadcast can be shortened.

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 figure which shows the radio lost point database 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 figure which shows the operation example of the seamless switching process which concerns on embodiment of this invention. It is a figure which shows the operation example of the seamless switching process 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, a radio broadcast receiver 1 and a navigation device 2 are mounted on an automobile, and the radio broadcast receiver 1 and the navigation device 2 are connected.
Here, the navigation device 2 includes a storage unit that stores map data, a GPS receiver, a vehicle speed sensor, an angular velocity sensor, and the like, and uses the map data, the GPS receiver, the vehicle speed sensor, the angular velocity sensor, and the like to Calculation, calculation of the current traveling direction, calculation of the current moving speed, search for a route to the set destination, and the like are performed. The navigation device 2 also displays a current location mark indicating the current position and current traveling direction on the map, and a guide image in which a route graphic representing the route to the destination is arranged on the map.

  Next, the radio broadcast receiver 1 receives from the radio broadcast station 3 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 a WAN 4 such as the Internet via mobile communication and receives an IP radio broadcast from an IP radio server 5 on the WAN 4.

  Here, the IP radio broadcast performed by the IP radio server 5 is an IP radio broadcast having a relationship between a digital radio broadcast, an analog radio broadcast and a simulcast, that is, a broadcast having the same contents as the digital radio broadcast and 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.

Further, the radio broadcast receiver 1 can access a radio lost point server 6 provided on the WAN 4 via mobile communication.
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 5 on the WAN 4 via the mobile communication device 104 that performs mobile communication, receives the audio stream distributed by the IP radio server 5 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 7 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 7. It may be configured to connect to the IP radio server 5 on the WAN 4 and receive, reproduce and output an audio stream distributed by the IP radio server 5 by IP radio broadcast.

The radio broadcast receiver 1 includes an input device 106, a display device 107, a memory 108, and a control unit 109.
Also, the radio broadcast receiver 1 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 110, and the audio data output from the delay unit 110. And the selector 111 that selects and outputs one of the audio data output from the IP radio player 103, the DA converter 112 that converts the audio data output from the selector 111 into an analog audio signal, and the analog audio that is output from the DA converter 112 An amplifier 113 that amplifies the signal and a speaker 114 that is driven by the audio signal amplified by the amplifier 113 and outputs sound are provided.

The radio broadcast receiver 1 also includes a tuner memory 115, a player memory 116, and a comparison unit 117.
Next, a radio lost point database is stored in the memory 108 of the radio broadcast receiver 1.
FIG. 3 shows the configuration of this radio lost point database.
As shown in the figure, the radio lost point database stores a radio lost point table provided corresponding to each radio broadcast of digital radio broadcast and analog radio broadcast.

  Each radio lost point table stores radio broadcast identification information indicating identification of the corresponding radio broadcast and lost point information. The lost point information includes the radio broadcast at the time when the corresponding radio broadcast cannot be normally received due to the deterioration of the reception quality of the radio broadcast during the reception of the corresponding radio broadcast by the radio broadcast receiver 1. For each lost point where the receiver 1 is located, point data corresponding to the point is registered.

  In each point data, a lost point coordinate indicating the coordinates of the lost point, a lost passage direction indicating the direction passing through the lost point, and a lost date indicating the date and time passing through the lost point are registered.

  In such a configuration, when the control unit 109 is instructed to receive a radio broadcast of a specific radio broadcast station 3 from the user via the input device 106, the radio broadcast station 3 instructed to receive the digital radio station 3 If it is a broadcast station, the digital radio tuner 101 is the active tuner, and if the radio broadcast station 3 instructed to receive is an analog radio broadcast station, the analog radio tuner 102 is the active tuner, and reception is received by the active tuner. Reception of the designated radio broadcast station 3 and output of audio data are started. Further, the control unit 109 clears the stored contents of the tuner memory 115 and the player memory 116, sets 0 as the delay target time in the delay unit 110, and directly receives the audio data input from the current tuner in the delay unit 110. The data is output to the selector 111. Then, the control unit 109 causes the selector 111 to output the audio data input from the delay unit 110 to the DA conversion unit 112, so that the audio received from the radio broadcast station 3 instructed to be received from the user by the active tuner is output to the speaker. 114.

  On the other hand, the audio data output from the current tuner is stored in the tuner memory 115. Here, the storage in the tuner memory 115 is performed so that the latest audio data for a predetermined reproduction time is always stored in the tuner memory 115. The amount of audio data that is always stored in the tuner memory 115 is such that the reproduction time of the audio data stored in the tuner memory 115 is related to the digital / analog radio broadcast and the simulcast for the digital / analog radio broadcast. It is set to be equal to or longer than the time expected as the maximum delay time of IP radio broadcasting.

In such a radio broadcast receiver 1, the control unit 109 performs the following lost point registration process.
That is, in the lost point registration process, the control unit 109 receives a radio broadcast due to deterioration of the reception quality of the radio broadcast while the digital radio tuner 101 or the analog radio tuner 102 is receiving the radio broadcast (digital radio broadcast or analog radio broadcast). If reception becomes impossible, the current position and the current traveling direction are acquired from the navigation device 2. Then, create new point data with the acquired current position as the lost point coordinates, the acquired traveling direction as the passing direction at the time of lost, and the current date and time as the lost date and time, and identify the radio broadcast being received in the radio lost point database. The registered radio broadcast identification information is registered in the radio lost point table. However, the created new point data, the point data that approximates the lost point coordinates and the passing direction at the time of lost, are stored in the radio lost point table in which the radio broadcast identification information indicating the identification of the radio broadcast being received is registered. If already registered, the newly created point data is registered after deleting the already registered point data.

  Further, if the control unit 109 creates new point data as described above, the control unit 109 sends a point data registration request including the created new point data and the radio broadcast identification information of the radio broadcast being received to the mobile communication. To the radio lost point server 6 on the WAN 4. The mobile communication is performed using the mobile communication device 104 when the mobile communication device 104 is provided in the radio broadcast receiver 1, and the mobile communication device 104 is not provided in the radio broadcast receiver 1 and the radio broadcast receiver is used. When the mobile phone 7 is configured to be connectable to 1, the mobile phone 7 is used.

  The radio lost point server 6 includes an integrated radio lost point database having the same configuration as the radio lost point database shown in FIG. 3, and upon receiving a point data registration request from the radio broadcast receiver 1, the point data registration request is received. Is registered in the radio lost point table in which radio broadcast identification information associated with the point data registration request is registered in the integrated radio lost point database. However, the radio lost point server 6 performs radio broadcasting according to the point data registration request in the integrated radio lost point database in accordance with the point data accompanying the point data registration request and the point data in which the lost point coordinates and the passing direction when lost are approximate. If already registered in the radio lost point table in which the identification information is registered, the point data associated with the point data registration request is registered after the already registered point data is deleted.

  Now, in such a radio broadcast receiver 1, if the control unit 109 becomes unable to receive the radio broadcast being received by the current tuner while the radio broadcast sound is being output from the speaker 114. For example, the IP radio player 103 causes the radio tuner 103 to start receiving an IP radio broadcast that is in a relationship between the radio broadcast being received and the simulcast, and the selector 111 outputs the audio data output to the DA converter 112. Is switched to the audio data output from the IP radio player 103 from the IP radio broadcast.

  In addition, the control unit 109 seamlessly between the sound received by the radio broadcast that is receiving the sound to be output to the speaker 114 and the sound received by the IP radio broadcast that has a relationship between the currently received radio broadcast and the simulcast. Perform the switching process.

Hereinafter, a seamless switching process performed by the control unit 109 for such seamless switching will be described.
FIG. 4 shows the procedure of the seamless switching process. The seamless switching process is activated when the user gives an instruction to receive a radio broadcast from a specific radio broadcast station 3.
As shown in the figure, in this process, the radio broadcast receiver 1 waits until the radio broadcast sound is being output from the speaker 114 (step 402), and the radio broadcast sound is output from the speaker 114. If it is in the state, the radio lost point table of the radio broadcast being received by the current tuner is acquired (step 404).

  The radio lost point table of the radio broadcast being received by the current tuner is acquired from the radio lost point database stored in the memory 108 by acquiring the radio lost point table in which the radio broadcast identification information of the radio broadcast being received is registered. To do.

  Alternatively, acquisition of the radio lost point table of the radio broadcast being received by the current tuner is performed by acquiring from the radio lost point server 6. That is, in this case, the control unit 109 issues a radio lost point table request accompanied by radio broadcast identification information of the radio broadcast being received to the radio lost point server 6, and the radio lost point 1 is transmitted from the radio broadcast receiver 1. Upon receiving the table request, the radio lost point server 6 extracts the radio lost point table in which the radio broadcast identification information associated with the radio lost point table request is registered from the integrated radio lost point database, and transmits it to the radio broadcast receiver 1.

  Here, whether the radio lost point table is acquired from the radio lost point database in the memory 108 or from the radio lost point server 6 depends on the setting of the acquisition source of the radio lost point table received from the user in advance.

  However, the radio lost point table may be obtained only from the radio lost point database in the memory 108. In this case, the radio lost point server 6 may not be provided. Alternatively, the radio lost point table may be acquired only by acquisition from the radio lost point server 6. In this case, the radio lost point table may not be provided in the memory 108.

  Next, if the current tuner acquires the radio lost point table of the radio broadcast being received by the tuner in this way, the control unit 109 is expected to pass the vehicle in the traveling direction during the lost time within the threshold value Th. It is checked whether the point data of the lost point is registered in the acquired radio lost point table (step 406).

  Here, the threshold value Th is a time estimated as the maximum value of the time required to execute the processing from step 406 to step 418 described later, or a time obtained by adding a predetermined margin to the time.

  Further, whether the point data of the lost point that is expected to pass in the traveling direction of the automobile within the threshold Th is registered in the acquired radio lost point table is examined as follows.

That is, the control unit 109 hands over the acquired radio lost point table to the navigation device 2 and requests a check of the lost point.
When the route to the destination is set, the navigation device 2 requested to check the lost point uses the lost point coordinates from the radio lost point table as the coordinates on the route between the current position and the destination. If the point data in which the traveling direction of the route in the lost point coordinates (the direction toward the destination) is registered as the traveling direction at the time of lost is searched, and the search fails, the registration unit responds with no registration to the control unit 109. . On the other hand, if the search is successful, out of the point coordinates registered in the searched point data, the required travel time to the point coordinates that pass first when traveling the route is the current travel speed of the car, It is calculated from the distance from the current position to the nearest point coordinates, etc., and the calculated required travel time is returned to the control unit 109.

  On the other hand, when the route to the destination has not been set, the navigation device 2 that has been requested to check the lost point indicates from the radio lost point table the current position on the currently traveling road (route). The travel direction (upward / downward) side coordinates are the lost point coordinates, and the road travel direction at the lost point coordinates (the passing direction of the lost point coordinates when traveling on the road in the current travel direction) proceeds when lost When the point data registered as the direction is searched and the search fails, the control unit 109 is responded with no registration. On the other hand, if the search is successful, of the point coordinates registered in the searched point data, the travel time to the point coordinates that pass first when traveling on the road that is currently running is calculated The travel speed and the distance from the current position to the nearest point coordinates are calculated, and the calculated required travel time is returned to the control unit 109.

  Further, if the navigation device 2 responds to the control unit 109 with the required travel time, the navigation device 2 monitors the passing of the current position of the vehicle at the point coordinates for which the required travel time has been calculated and the change of the planned course of the vehicle. When either the passing of the current position of the car at the coordinate or the change of the planned course of the car occurs, and within the predetermined period after the calculation of the required travel time, the passing of the current position of the car at the point coordinate When none of the scheduled route changes occurs, the controller 109 is notified of the required travel time invalidation notification. Here, the change of the planned route of the car is detected when the current position deviates from the current position when the route is set, and required when the route is not set. It is detected when a deviation of the current position occurs outside the road that was running when the running time was calculated.

  Then, the control unit 109 passes the vehicle in the traveling direction when the vehicle is lost within the threshold value Th when a response is received from the navigation device 2 indicating no registration and when a required traveling time greater than the threshold value is responded. If it is determined that the point data of the lost point that is expected to be registered is not registered in the acquired radio lost point table, and the required travel time less than the threshold is responded, the lost vehicle is within the threshold Th. It is determined that the point data of the lost point that is expected to pass in the forward direction is registered in the acquired radio lost point table.

  Then, the control unit 109 determines that the point data of the lost point that is expected to pass in the traveling direction of the automobile within the threshold value Th is not registered in the acquired radio lost point table. If so (step 406), the process of step 406 is repeated.

  On the other hand, if it is determined that the point data of the lost point that is expected to pass in the traveling direction of the automobile within the threshold Th is registered in the acquired radio lost point table (step 406), The IP radio player 103 controls the start of reception of the IP radio broadcast that is in the relationship between the radio broadcast being received by the current tuner and the simulcast (step 408).

  On the other hand, the IP radio player 103 controlled to start the reception of the IP radio broadcast causes the mobile communication device 104 or the mobile phone 7 to start the mobile communication, and the radio on the WAN 4 that is being received by the current tuner via the mobile communication. The IP radio server 5 that performs IP radio broadcasting that has a relationship between broadcasting and simulcasting is accessed, and reception of the IP radio broadcasting is started.

  Then, if the reception of the IP radio broadcast by the IP radio player 103 is started (step 410), the control unit 109 sets the delay time of the sound received by the IP radio broadcast with respect to the sound received by the radio broadcast being received. Calculate (step 412).

Here, the delay time is calculated as follows.
In other words, the control unit 109 stops the audio data storage operation in the tuner memory 115, and controls so that the stored content of the audio data in the tuner memory 115 does not change from that point.

  Further, the control unit 109 causes the player memory 116 to store audio data for a predetermined reproduction time received first in the IP radio broadcast output from the IP radio player 103.

  Further, the control unit 109 causes the comparison unit 117 to search for a portion of the audio data stored in the tuner memory 115 that matches the audio data stored in the player memory 116. Then, the difference between the reception time of the audio data stored in the player memory 116 and the reception time of the portion of the audio data stored in the searched tuner memory 115 is calculated as a delay time. The reception time of the portion in the audio data stored in the searched tuner memory 115 can be obtained from the position in the continuum of the audio data stored in the tuner memory 115 of the searched portion.

Next, if the delay time is calculated (step 412), the calculated delay time is set in the delay unit 110 as the delay target time (step 414).
Here, the delay unit 110 set with the delay target time outputs the set delay target time until the delay time for the audio data input to the delay unit 110 of the audio data output from the delay unit 110 matches. Time-stretch audio data to be played. That is, when the set delay target time is larger than the delay time of the audio data output from the delay unit 110 at that time, the delay unit 110 outputs the set delay target time and the delay unit 110. Until the delay times of the audio data match, the input audio data is enlarged and output in the time axis direction while maintaining the audio pitch of the audio data, and the set delay target time is the delay portion at that time. When the delay time is smaller than the delay time of the audio data output from 110, the input audio data is determined as the audio data until the set delay target time matches the delay time of the audio data output from the delay unit 110. The audio pitch is maintained and reduced in the time axis direction for output. 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.

  Then, when the set delay target time and the delay time of the audio data output from the delay unit 110 match, the delay unit 110 stops time stretching and returns to output of audio data at a normal playback speed. At the same time, the control unit 109 reports the coincidence of the delay times.

  On the other hand, if the delay time (target delay time) calculated in step 412 matches the delay time of the audio data output from the delay unit 110, the control unit 109 reports that the delay time coincides with the delay unit 110. (Step 416) When the selector 111 switches the audio data output to the DA converter 112 to the audio data output from the IP radio player 103, the IP radio player 103 receives the audio output from the speaker 114 from the IP radio broadcast. The voice is switched to the current voice (step 418). Here, at this time, the delay unit 110 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 111, the audio data output from the speaker 114 is seamlessly switched from the audio data received by radio broadcasting to the audio data output by the IP radio player 103.

  When the output from the speaker 114 of the audio received by the IP radio player 103 by the IP radio broadcast is started in this way, the control unit 109 receives the above-mentioned required travel time invalidation notification from the navigation device 2. Waiting for reception (step 420).

  If the required travel time invalidation notification is received (step 420), it is monitored that the reception quality of the radio broadcast in the active tuner returns to a good reception quality (step 422). Here, the reception quality of the radio broadcast being received by the current tuner is detected by the reception quality of the radio broadcast being received by the digital radio tuner 101 or the analog radio tuner 102 which is the current tuner. The calculation is performed based on the reception field strength, the SN ratio, the error occurrence rate, and the like, and the control unit 109 acquires the reception quality calculated in the current tuner.

  When the reception quality returns to a good reception quality, the selector 111 delays the audio data output to the DA converter 112 after waiting for the passage of the time set in the delay unit 110 as the delay target time. By switching to the audio data output from unit 110, the sound output to speaker 114 is switched to the sound of the radio broadcast being received by the current tuner (step 424). Here, at this time, the delay unit 110 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 111, the audio data output from the speaker 114 is seamlessly switched from the audio data output from the IP radio player 103 to the audio data received by radio broadcasting.

  Next, the storing operation of the audio data in the tuner memory 115 is restarted, and the IP radio player 103 is stopped from receiving the IP radio broadcast (step 426), and the process returns to step 40R. Here, the IP radio player 103 disconnects the mobile communication with the mobile communication device 104 or the WAN 4 of the mobile phone 7 when the reception of the IP radio broadcast is stopped.

The seamless switching process performed by the control unit 109 has been described above.
The seamless switching process as described above ends when the user instructs the end of reception of the radio broadcast being received. The seamless switching process as described above is restarted when the user instructs to receive a new radio broadcast station 3.

Hereinafter, a processing example of such seamless switching processing will be described.
FIG. 5 shows an example of seamless switching processing.
Now, assuming that the reproduction time of a predetermined time length is a unit time, each square surrounding the number in FIG. 5 represents audio data and voice for the 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 115 stores audio data for five unit times.

  Now, assuming that the delay target time is set to 0 in the delay unit 110 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. 111 is set to output the audio data output from the delay unit 110 to the DA converter 112, and the audio data (0-3) received by the current tuner from the radio broadcast is received by the delay unit 110. The signal is output from the speaker 114 via the selector 111, the DA converter 112, and the amplifier 113 without being delayed. Also, the audio data (0-3) sequentially output by the current tuner is sequentially stored in the tuner memory 115, and eventually the tuner memory 115 always stores audio data for five unit time lengths. Become.

  In this state, if the passing of the point coordinate X of the lost point data registered in the lost point table of the working tuner within the threshold Th in the lost traveling direction is predicted at time T1, the working tuner The IP radio player 103 starts an operation of receiving an IP radio broadcast having a relationship between the radio broadcast being received and the simulcast. 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 110, but is sent to the selector 111, the DA conversion unit 112, and the amplifier 113. And the audio data (4-5) are sequentially stored in the tuner memory 115.

  When reception of IP radio broadcast audio data is started at time T2, storage of the audio data in the tuner memory 115 is stopped and the stored contents in the tuner memory 115 are frozen. Also, the audio data (4 ′) received first in the IP radio broadcast is stored in the player memory 116.

  When reception of IP radio broadcast audio data is started at time T2, a search is started in the comparison unit 117, and audio data (1-5 stored in the tuner memory 115 at time T2-T3). ) Is searched for audio data having the same sound pattern as the audio data (4 ′) in the player memory 116, and the audio data (4) stored in the tuner memory 115 of the searched audio data (4) 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 (4) obtained from the storage position in the continuum of 1-5). Here, at time T2-T3, the audio data (4 ′) in the player memory 116 matches the audio data (4) in the tuner memory 115, and two unit times are calculated as the delay time.

On the other hand, between time T2 and time T3, the audio data (6-7) received by the active tuner from the radio broadcast is not delayed by the delay unit 110 and passes through the selector 111, the DA conversion unit 112, and the amplifier 113. If the delay time is calculated at time T3, the calculated delay time is set in the delay unit 110 as the delay target time. Since the set delay target time is larger than the delay time 0 at this time, the delay unit 110 starts time stretching for expanding and outputting the audio data input from the current tuner in the time axis direction while maintaining the pitch. . The audio data (8-9) expanded in the time axis direction is sequentially output from the speaker 114 via the selector 111, the DA converter 112, and the amplifier 113.

  Then, at the time T4 when the output of the audio data (9) expanded in the time axis direction is completed, the delay time of the audio data output from the delay unit 110 with respect to the audio data input to the delay unit 110 is the set delay target time. The audio data output by the selector 111 to the DA converter 112 is switched from the audio data output from the delay unit 110 to the audio data output by the IP radio player 103. As a result, the sound output from the speaker 114 is switched from the sound received by the active tuner from the radio broadcast to the sound received by the IP radio broadcast, and the audio data (10′-15 ′) output by the IP radio player 103 is selected by the selector. 111, the DA converter 112, and the amplifier 113 to be output from the speaker 114.

Here, at time T4, the delay unit 110 delays 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 received by the active tuner. Thus, the audio data output from the speaker 114 is seamlessly switched from audio data received by radio broadcasting to audio data output by the IP radio player 103.
In addition,

  In addition, at time T4 when the output of the audio data (9) expanded in the time axis direction is completed, the time stretch of the delay unit 110 is stopped, and after time T4, the current tuner is operated at a normal playback speed from the delay unit 110. Audio data (10-14) received from the radio broadcast is output.

  Here, the delay unit 110 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 (8-9) or output without time-stretching as in audio data (10-14). Note that the audio data in the rectangular frame of the buffer in the figure represents the audio data being output by the delay unit 110.

  When the passage of the current position of the point coordinate X for which the required travel time has been calculated is detected at time T5, the navigation device 2 issues a required time invalidation notification, and the reception quality of the current tuner is improved. Monitoring of return is started. In addition, radio broadcasts cannot be received by the current tuner. It should be noted that dummy audio data x representing silence is sequentially stored in the FIFO memory buffer of the tuner memory 115 and the delay unit 110 during a period in which the radio broadcast cannot be received.

  Although not shown, when the reception quality of the current tuner returns to a good reception quality, the selector 111 outputs to the DA converter 112 after the time set as the delay target time in the delay unit 110 has elapsed. The audio data is switched from the audio data output from the IP radio player 103 to the audio data output from the delay unit 110, and the IP for the audio data received by the current tuner from the radio broadcast and received by the delay unit 110 through the radio broadcast. The audio data delayed by the delay time of the audio data received by radio broadcasting is output from the speaker 114 via the selector 111, the DA converter 112, and the amplifier 113. At the time of this switching, the delay unit 110 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. The audio data output from 114 is seamlessly switched from the audio data output from the IP radio player 103 to the audio data received by radio broadcasting.

Next, the effect of such seamless switching processing is shown in FIG.
Now, as shown in FIG. 6a, it is assumed that the vehicle passes through point X1, point X2, and point X3 in order, the passing time of the point X1 of the vehicle is Tn, the passing time of the point X2 of the vehicle is T1, and the point X3 of the vehicle Assume that the passage time of T5 is T5. Further, the radio broadcast received by the current tuner is output from the radio broadcast receiver 1, and the car reaches the point X1, and the radio broadcast received by the current tuner at the point X1. The reception quality is lower than a predetermined reference level. Further, the point X3 is a radio lost point at which the radio broadcast being received by the current tuner becomes unreceivable when passing through the point X1 in the direction from X2 to X3 in the past, and the point X2 reaches the point X1. Is the point where the required travel time becomes the threshold value Th.

  In this case, according to the seamless switching process according to the present embodiment, as shown in FIG. 6B, from the time T1 at the time of passing through the point X2, the IP radio broadcast having the relationship between the radio broadcast being received by the current tuner and the simulcast is obtained. Reception start is controlled. After that, at time T2 when the preparation process for reception of the IP radio broadcast is completed, the reception of the IP radio broadcast is started, and the delay time of the IP radio broadcast with respect to the radio broadcast by time stretching to the received sound of the radio broadcast At time T4 when the delay of the minute is completed, the output sound is switched from the radio broadcast reception voice to the IP radio broadcast reception voice. Then, at the time T5 when the point X3, which is a radio lost point, is passed, the current tuner becomes unable to receive radio broadcasts normally.

On the other hand, as shown in FIG. 6c as a comparative example, when the reception quality of the active radio broadcast deteriorates below a predetermined reference level, the seamless switching process of the output sound from the reception sound of the active tuner to the reception sound of the IP radio broadcast Is started, the reception start of the IP radio broadcast having the relationship between the radio broadcast being received by the current tuner and the simulcast is controlled from the time Tn when the point X1 passes. After that, at the time Tn1 when the preparation process for the reception of the IP radio broadcast is completed, the reception of the IP radio broadcast is started, and the time delay of the IP radio broadcast with respect to the radio broadcast is performed by the time stretching to the received sound of the radio broadcast. At time Tn2 at which the delay of the minute is completed, the output sound is switched from the radio broadcast reception voice to the IP radio broadcast reception voice. Then, at the time T5 when the point X3, which is a radio lost point, is passed, the current tuner becomes unable to receive radio broadcasts normally.
Here, when the process of seamlessly switching the output sound from the reception sound of the current tuner to the reception sound of the IP radio broadcast is started when the reception quality of the current radio broadcast deteriorates from a predetermined reference level, reception becomes impossible. Since the rate of change in the reception quality of the previous radio broadcast varies, if the reference level for detecting the deterioration of the reception quality of the active radio broadcast is set low, before the radio broadcast becomes unreceivable, the IP radio There is a case where the seamless switching to the received voice cannot be completed in time. For this reason, it is necessary to set the reference level to a relatively high value with a margin. Generally, the point X1 and the time point Tn at which the reception quality of the active radio broadcast is deteriorated from a predetermined reference level are the radio lost. The required traveling time to the point X3 is the point X2, the point before the time T1, and the time point where the threshold Th is reached.

  Therefore, as shown by a comparison between FIG. 6b and FIG. 6c, according to the present embodiment, when the reception quality of the radio broadcast received by the current tuner deteriorates from a predetermined reference level, the received sound of the current tuner The reception period of IP radio broadcast can be shortened compared to the case where the seamless switching process of output sound from IP to the reception sound of IP radio broadcast is started.

  Also, when the reception quality of the radio broadcast received by the current tuner in an area far from the radio lost point has deteriorated from a predetermined reference level, and the reception quality has recovered well before the radio broadcast becomes unreceivable. In this embodiment, no IP radio broadcast is received.

  Therefore, also from this point, according to the present embodiment, when the reception quality of the radio broadcast received by the current tuner is deteriorated from a predetermined reference level, the reception voice of the current tuner is changed to the reception voice of the IP radio broadcast. As compared with the case where the seamless switching process of the output audio is started, the reception period of the IP radio broadcast can be shortened.

The embodiment of the present invention has been described above.
By the way, in the seamless switching process shown in FIG. 4 of the above-described embodiment, when the current tuner outputs the sound received by the radio broadcast, the vehicle passes through in the lost travel direction within the threshold value Th. When the point data of the expected lost point is registered in the radio lost point table of the radio broadcast being received (step 406), the process proceeds to the processing after step 408 and the received audio of the output radio IP radio broadcast The point data of the lost point that is expected to pass in the traveling direction when the vehicle is lost within the threshold value Th is the radio lost point of the radio broadcast being received. In addition to the case where it is registered in the table (step 406), the reception quality of the radio broadcast of the current tuner is a predetermined reference level. The point data of the lost point that is deteriorated and the point coordinates are located within a predetermined distance D from the current position of the vehicle (provided that the predetermined distance D> threshold Th, for example, D = 2 × Th). However, even if it is not registered in the radio lost point table of the radio broadcast being received, the process may proceed to step 408 and subsequent steps to seamlessly switch the output audio to the received audio of the IP radio broadcast. .

  Further, the above embodiment may be implemented by correcting so that the lost passage direction is not registered in the point data of the lost point table. However, in this case, the navigation device 2 that has been requested to check the lost point in the process of step 406 of the seamless switching process in FIG. 4 has the radio lost point when the route to the destination is set. From the table, search the point data in which the coordinates on the route between the current position and the destination are registered as lost point coordinates, and if the route to the destination is not set, from the radio lost point table The search is made for point data in which coordinates on the current traveling direction (upward / downward) side from the current position on the currently traveling road (route) are registered as lost point coordinates. When the search fails, the navigation device 2 responds to the control unit 109 with no registration. When the search is successful, the navigation device 2 advances the route among the point coordinates registered in the searched point data. In this case, the required travel time to the point coordinates that pass first is calculated, and the calculated required travel time is returned to the control unit 109.

Here, when the radio broadcast is being received and the lost point of the radio broadcast is being approached, there is a high probability of passing the lost point in the lost travel direction. Even if it is not used in the point data of the point table or the seamless switching process, the same effect as in the above embodiment can be expected.
Note that the present embodiment can be similarly applied to a mobile device incorporating the radio broadcast receiver 1 and the navigation device 2.

  DESCRIPTION OF SYMBOLS 1 ... Radio broadcast receiver, 2 ... Navigation apparatus, 3 ... Radio broadcasting station, 4 ... WAN, 5 ... IP radio server, 6 ... Radio lost point 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 ... memory, 109 ... control unit, 110 ... delay unit, 111 ... selector, 112 ... DA Conversion part 113 ... Amplifier, 114 ... Speaker, 115 ... Tuner memory, 116 ... Player memory, 117 ... Comparison part.

Claims (8)

A radio broadcast receiving system capable of receiving radio broadcasts and IP radio broadcasts that are in a relationship between the radio broadcasts and the simulcasts, and that transmits audio having the same content as the radio broadcasts with a delay relative to the radio broadcasts,
A radio receiver for receiving radio broadcasts;
An IP radio player for receiving the IP radio broadcast via mobile communication;
An output selection unit that outputs the received voice of one of the two received voices to which the received voice of the radio receiver and the received voice of the IP radio player are input;
Delay means for delaying the reception sound of the radio reception unit to be input to the output selection unit,
The IP radio player is caused to start receiving the IP radio broadcast having the relationship between the radio broadcast received by the radio receiver and the simulcast via the mobile communication, and the delay means causes the IP radio broadcast to be received by the IP radio player. The radio reception unit receives the reception audio output to the output selection unit after delaying the reception audio of the radio reception unit input to the output selection unit by a delay time of radio broadcasting. A control unit that performs a switching operation for switching from voice to received voice of the IP radio player;
Information acquisition means for acquiring the reception incapacity occurrence point information in which the point at which the reception state of the radio broadcast received by the radio reception unit changes to the reception incapable state is registered;
Current position calculating means for calculating the current position;
The control unit performs the switching operation with a predetermined degree of approach of the current position calculated by the current position calculating unit to a point registered in the unreceivable point information acquired by the information acquiring unit. A radio broadcast receiving system that starts when it reaches a level. The radio broadcast receiving system according to claim 1,
Information holding means for holding the unreceivable point information provided corresponding to each radio broadcast;
The radio station that the information holding unit holds the point that the current position calculating unit calculates as the current position when the reception state of the radio broadcast being received by the radio receiving unit is changed to a non-receivable state. A receiving unit having registration means for registering in the unreceivable point information corresponding to the radio broadcast being received;
The radio broadcast receiving system characterized in that the information acquiring means acquires from the information holding means information on a reception impossible point corresponding to a radio broadcast being received by the radio receiver. The radio broadcast receiving system according to claim 1,
Information that holds the unreceivable point information provided corresponding to each radio broadcast via mobile communication when the reception state of the radio broadcast being received by the radio reception unit is changed to the unreceivable state. Connect to a server, and register the location calculated by the current location calculation means as the current location in the information on the location where the radio reception unit is incapable of receiving the radio broadcast being received by the information reception unit. Registration means to
The information acquisition means is connected to the information server via mobile communication, and receives from the information server unreceivable point information corresponding to the radio broadcast being received by the radio receiver from the information server. Broadcast receiving system. A radio broadcast receiving system according to claim 2 or 3,
The registration means, when the reception state of the radio broadcast being received by the radio reception unit is changed to an unreceivable state, the current position is added to the unreceivable point information corresponding to the radio broadcast being received by the radio reception unit. Along with the point calculated by the calculation means as the current position, the moving direction of the current position is registered,
The control unit is a point registered in the unreceivable point information acquired by the information acquisition unit, and is expected to pass along the moving direction registered in the unreceivable point information together with the point. The radio broadcast receiving system, wherein the switching operation is started when the degree of approach of the current position to a point reaches the predetermined level. The radio broadcast receiving system according to claim 1, 2, 3 or 4,
When the estimated value of the time required to reach the point registered in the unreceivable point information acquired by the information acquisition unit is within a predetermined time, the control unit determines the degree of approach of the current position. The radio broadcast receiving system is characterized by determining that the predetermined level has been reached and starting the switching operation. The radio broadcast receiving system according to claim 5,
The radio broadcast receiving system, wherein the predetermined time is a time expected as a maximum value of the time required for the switching operation or a time obtained by adding a predetermined margin to the time. The radio broadcast receiving system according to claim 1, 2, 3, 4, 5 or 6,
The radio broadcast receiving system, wherein the radio broadcast is at least one of a digital radio broadcast and an analog radio broadcast. The radio broadcast receiving system according to claim 1, 2, 3, 4, 5, 6 or 7.
The radio broadcast receiving system is an in-vehicle radio broadcast receiving system mounted on an automobile.