JP2017063286A - Electronic apparatus, program changeover program, and changeover method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of seamlessly changing over a program without creating discomfort as much as possible.SOLUTION: An on-vehicle device 10 includes: a first tuner 110A; a second tuner 110B; a signal processing section 120; and a control section 180 for controlling the respective parts. When a program being received at present is to be changed over into the same program being broadcast by another broadcasting station, the control section 180 determines whether the program of the other broadcasting station delays from the program being received at present. When delay is determined, the reproduction speed of the program being received at present is set in response to contents of the program so as to allow the program being received at present to synchronize with the program of the other broadcasting station. The signal processing section 120 outputs a sound signal at the set reproduction speed. The program is changed over into the program of the other broadcasting station after synchronization.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronic apparatus having a function of receiving a radio broadcast, and more particularly, to switching to a station that is broadcasting the same program as a currently received program.

  Due to the digitization of audio broadcasting, digital audio broadcast (hereinafter referred to as DAB) and digital audio broadcast + (hereinafter referred to as DAB +) have been put into practical use in Europe and the like (Patent Document 1). Digital modulation is orthogonal frequency division multiplexing (OFDM), and the compression method is MPEG Audio Layer 2. Furthermore, in Europe, RDS (Radio Data System) is also put into practical use. In RDS, various digital data are multiplexed and transmitted on an analog FM broadcast signal.

  In a vehicle-mounted receiving device, when a vehicle moves while receiving a desired station and leaves the receiving area, or when the receiving environment deteriorates due to multipath or the like, a new station must be selected. In DAB / DAB + and analog FM broadcasting, the same service (program) may be broadcast at the same time. In DAB, RDS, etc., the station that broadcasts the same program is automatically selected, and the user manually The inconvenience of switching the frequency can be eliminated. That is, a receiving apparatus that receives DAB, RDS, etc., multiplexes data (for example, program identification code (PI), program name (PS), frequency list (AF) of the same program, program content identification code (PTY)). Etc.) to check whether the seek station is broadcasting the same program as the currently received broadcast station, seek to the desired broadcast station based on the AF list, It has a function of switching to analog broadcasting that broadcasts the same program as the program or digital broadcasting of a different frequency.

  When switching from digital broadcasting to analog broadcasting, Patent Document 2 fades out an audio output signal or the like based on a broadcast signal before switching, and fades in an audio signal or the like based on the broadcast signal after switching, thereby causing a sense of incongruity associated with switching. Discloses a television broadcast receiver. Patent Document 2 discloses that audio data or the like is added or deleted at a predetermined ratio in order to absorb the time difference between digital broadcasting and analog broadcasting. Patent Document 3 discloses a digital broadcast receiving apparatus that adjusts display timing when switching between a plurality of hierarchies to be simulcast. Patent Document 4 discloses a delay time between two broadcasts for switching control between a broadcast wave type broadcast such as an FM broadcast and an IP type broadcast distributed via a network, and one playback speed is calculated based on the delay time. A receiving apparatus is disclosed that can be switched at the timing when both broadcasts are synchronized by adjusting.

JP-A-10-215196 JP 2008-211144 A JP 2011-259296 A JP 2013-201469 A

  Even when the same program is broadcast by DAB, DAB +, or FM broadcast, there may be a time difference in the broadcast signal between the programs. In such a case, it is necessary to adjust the time difference at the time of switching to a program, and to eliminate a sense of discomfort to the viewer by making a seamless audio output.

  FIG. 8 is a diagram conceptually illustrating a time stretch function that is one of the time difference adjustment methods. The time stretch function refers to a process of delaying the time required to reproduce or output an audio signal, and reproduces the audio signal at a reproduction speed slower than the normal reproduction speed. FIG. 8A shows a case of switching from the service 2 program to the service 1 program. The service 1 program is delayed by, for example, 6 seconds from the service 2 program. In such a case, the time stretch function is executed for the service 2 program, and after the service 2 program is synchronized with the service 1 program, switching to the service 1 program is performed.

  In the example shown in the figure, when the expansion degree is set to 5% with respect to the time difference (T1-T2) between the programs of the service 2 and the service 1, and the time stretch of the program of the service 2 is executed, the audio signal of the service 2 is Playback is performed at a lower playback speed than usual. As a result, the audio signals of the service 2 program and the service 1 program are synchronized at time T3, and the time difference (T1-T2) is eliminated. The adjustment time required for time stretching, that is, the adjustment time required for synchronization is represented by the time difference between programs / the degree of expansion (%). In the case of FIG. 8 (A), since the degree of expansion is 5%, the adjustment time is 120 seconds. In the case of FIG. 8 (B), the degree of expansion is 10%, so the adjustment time from time T1 to time T4. Is 60 seconds. Then, after the adjustment time has elapsed, that is, after synchronization, switching to the program for the service 1 is performed.

  In this way, it is possible to adjust the time difference between programs by the time stretch function. However, as shown in FIG. 8A, if the degree of expansion is reduced, the uncomfortable feeling of audio output during time stretch and the program Although it is possible to reduce a sense of incongruity in the difference in audio output at the time of switching, it takes a long adjustment time to switch the program. On the other hand, as shown in FIG. 8B, if the degree of expansion is increased, the adjustment time until the program is switched can be shortened accordingly. However, the distortion of the audio output during time stretching or the switching of the program Will cause a difference in the sound output. In particular, in the case of a music program, if the rhythm or tempo of the output music changes, the change will be felt sensitively, and a sense of incongruity will easily occur.

  The present invention solves such a conventional problem, and provides an electronic device, a program switching program, and a switching method capable of seamlessly switching programs without causing a sense of incongruity as much as possible. Objective.

  An electronic device according to the present invention has a function of receiving a radio broadcast, and includes a receiving means for receiving a radio broadcast, a reproducing means for reproducing a broadcast signal of the received radio broadcast, and a reproduced broadcast Output means for outputting the audio of the signal, and control means for controlling the reproduction means when switching from the currently received program to the same program broadcast by another broadcast station, The control means determines whether or not the same program is delayed with respect to the currently received program, and determines that the currently received program is delayed when the determination means determines that the program is delayed. Setting means for setting the playback speed of the currently received program according to the content of the program so as to be synchronized with the same program.

  Furthermore, an electronic device according to the present invention has a function of receiving a radio broadcast, and includes a receiving unit that receives the radio broadcast, a reproducing unit that reproduces a broadcast signal of the received radio broadcast, Output means for outputting the sound of the broadcast signal, and control means for controlling the reproduction means when switching from the program currently being received to the same program being broadcast by another broadcast station, The control means determines whether or not the same program is delayed with respect to the currently received program, and when the determining means determines that the program is currently delayed, the currently received program And setting means for setting an expansion degree for expanding the currently received program according to the contents of the program so as to eliminate the time difference between the program and the same program.

  Preferably, the setting means sets the first playback speed or the first expansion degree when the program content belongs to the first type, and the second playback when the program content belongs to the second type. Set speed or second extension speed. Preferably, the first type is a music program, the second type is an audio program, and the first playback speed is slower than the second playback speed. Preferably, the first type is a music program, the second type is an audio program, and the first extension degree is smaller than the second extension degree. Preferably, the setting means includes a table defining the contents of the program and a reproduction speed or expansion degree corresponding to the contents of the program, and the setting means sets the reproduction speed or expansion degree according to the table. Preferably, the setting means identifies the content of the program based on program identification information included in the currently received broadcast signal. Preferably, the control means further includes a switching control means for controlling switching of the receiving means, and the switching control means is configured to switch the other broadcasting station after the currently received program is synchronized with the same program. Receive. Preferably, the determination means calculates a time difference between the two programs by comparing a broadcast signal of the currently received program with the broadcast signal of the same program, and the switching control means is configured to calculate the time difference and the expansion degree, Alternatively, after the reproduction time determined from the time difference and the reproduction speed has elapsed, the other broadcast station is received. Preferably, the electronic device includes a communication unit that communicates with an external network, and the other broadcast station is a broadcast station that distributes a program via the communication unit. Preferably, the receiving means includes a first receiving means and a second receiving means. When the first receiving means is receiving a current program, the second receiving means is the current program. Search for the same program.

  The program switching program according to the present invention is executed by an electronic device having a function of receiving a radio broadcast, and switches from a currently received program to the same program broadcast by another broadcasting station. And determining whether or not the same program is delayed with respect to the program currently being received, and when it is determined that the program is being delayed, the same program as the program currently being received Setting a degree of expansion for expanding the currently received program according to the contents of the program, and after expanding the currently received program, the other broadcast station's Switching to the same program.

  The program switching method according to the present invention is in an electronic apparatus having a function of receiving a radio broadcast, and switches from a currently received program to the same program broadcast by another broadcasting station. A step of determining whether or not the same program is delayed with respect to a program currently being received, and if it is determined that the program is being delayed, the currently received program and the same program are A step of setting a degree of expansion for expanding the currently received program according to the content of the program so as to eliminate the time difference; and after the expansion of the currently received program, the same of the other broadcast stations Switching to a program.

  According to the present invention, when the program is switched, the playback speed or expansion degree of the currently received program is set according to the content of the program, so that it does not cause a sense of incongruity according to the content of the program, In addition, the time for switching to a program can be shortened.

It is a block diagram which shows the structural example of the vehicle-mounted apparatus which has a radio reception function of the Example of this invention. It is a figure which illustrates the broadcast signal frame structure (data structure) employ | adopted by DAB broadcasting represented by digital radio broadcasting. It is a figure which shows the functional structural example of the program switching program which concerns on a present Example. It is an illustration of the table which prescribed | regulated the relationship between the program type (PTY) which concerns on a present Example, and the delay ratio of time stretch. It is a flowchart explaining the switching operation | movement of the program between the same programs of the vehicle-mounted apparatus which concerns on the Example of this invention. It is a figure explaining the effect of the switching operation of the program by the Example of this invention. It is a figure which shows the relationship between the expansion degree of the time stretch by the Example of this invention, adjustment time, and reproduction speed. It is a figure explaining the time stretch function which is one method of time difference adjustment. It is a block diagram which shows the structural example of the vehicle-mounted apparatus which has the radio reception function which concerns on the other Example of this invention.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. An electronic device according to the present invention is a vehicle-mounted device mounted on a moving body such as a vehicle, or a portable terminal that can be brought into a vehicle or the like (multifunctional portable terminal typified by a smartphone, tablet terminal, portable personal computer, etc. They have at least the function of receiving radio broadcasts. The electronic device according to the present invention can receive digital radio broadcast or analog radio broadcast, for example, DAB, DAB +, RDS broadcast, and the like. Further, the electronic device according to the present invention includes a function of receiving Internet broadcast via a network, a function of receiving TV broadcast, a navigation function, a function of reproducing audio / video data, a data communication function, etc. Can be provided.

  Next, examples of the present invention will be described. FIG. 1 is a block diagram illustrating a configuration example of an in-vehicle device having a radio reception function according to the present embodiment. The in-vehicle device 10 includes a first tuner 110A, a second antenna 100B, and a second antenna 110B that receive a broadcast signal of a broadcasting station (frequency) selected via the first antenna 100A and the first antenna 100A. The broadcast signals from the second tuner 110B and the first and second tuners 110A and 110B that receive the broadcast signal of the selected broadcast station (frequency) are received via the receiver, and necessary processing is executed for each broadcast signal. A signal processing unit 120, an amplifier 130 that amplifies the audio signal processed by the signal processing unit 120, a speaker 132 that outputs the audio signal amplified by the amplifier 130, a display that can display data decoded by the signal processing unit 120, and the like Unit 140, storage unit 150, input unit 160 that receives input from the user, navigation device, etc. Interface that allows connection to an external device (I / F) unit 170, first and second tuners 110A, 110B, the signal processing unit 120, configured to include a control unit 180 for controlling the amplifier 130 and the like.

  In the above configuration, the in-vehicle device 10 includes two tuners. However, this is an example, and the number of tuners may be one or three or more. When two tuners are provided, one of them can function as a main tuner and the other can function as a sub tuner, and the sub tuner can seek an alternative station while receiving a broadcast station with the main tuner. The tuner may be one that receives digital radio broadcast and / or analog radio broadcast. Alternatively, one tuner may receive digital radio broadcast and the other tuner may receive analog radio broadcast. Good. Furthermore, the in-vehicle device 10 can have a function of communicating with an external network or the like.

  In a preferred embodiment, the first tuner 110A receives an RF signal from the antenna 100A, an RF amplifier that amplifies the RF signal, a tuning circuit that selects a frequency signal of a desired station from the amplified RF signal, and a frequency signal from a local oscillator. And an RF signal to generate an intermediate frequency (IF) signal, a DC meter for detecting the intermediate frequency signal, and an S meter circuit for extracting a received electric field strength signal (S meter signal). Further, the first tuner 110 </ b> A converts the intermediate frequency signal (IF) and the S meter signal into digital signals by an ADC (analog / digital converter), and outputs these to the signal processing unit 120 and the control unit 180. The second tuner 110B is also configured similarly to the first tuner 110A. The first and second tuners 110 </ b> A and 110 </ b> B can select the same broadcast station or different broadcast stations (frequencies) according to instructions from the control unit 180.

  The signal processing unit 120 is configured using, for example, a DSP (Digital Signal Processor). The signal processing unit 120 performs various types of processing on the digital signals output from the first tuner 110A and the second tuner 120B. For example, for digital radio broadcast signals such as DAB / DAB +, signal processing such as FFT, digital filtering, signal synchronization, time / frequency deinterleaving, audio decoding, data decoding, and phase diversity is performed. In addition, for the RDS radio broadcast signal, data superimposed on the radio broadcast is decoded. Further, the signal processing unit 120 can include a buffer or the like for accumulating the audio signal, and by adjusting the speed at which the audio signal is read from the buffer, it is possible to adjust the playback speed or output speed of the audio signal. is there. Further, the signal processing unit 120 includes a DAC (digital / analog converter), converts the decoded digital audio signal into an analog audio signal, and provides the analog audio signal to the amplifier 130.

  The control unit 180 includes, for example, a microcontroller, a microprocessor, and the like, and controls each unit by executing a program stored in a memory such as a ROM / RAM. In the present embodiment, when the first tuner 110A is receiving a program of a broadcasting station, the control unit 180 receives the second tuner 110B when the reception sensitivity deteriorates or the reception area is out of the reception area. Has a function of searching for a broadcasting station that broadcasts the same program as the program currently being received and automatically switching to the same program. When switching the same program, if the program to be switched to is delayed from the program currently being received, the time stretch function is executed for the program currently being received, and the time difference between the programs is resolved. Switch programs. Further, if the in-vehicle device 10 has only one tuner, the search for an alternative broadcast station may be performed by time division processing.

  Next, the detailed operation of the in-vehicle device 10 of the present embodiment will be described. FIG. 2 shows a mode II DAB broadcast signal frame structure used in DAB broadcast, represented by digital audio broadcast. One frame length is 24 ms, and the frame structure includes a 2-symbol synchronization unit SYNC, a 3-symbol high-speed information channel unit FIC (Fast Information Channel), and a 72-symbol data field unit DFL. The synchronization unit SYNC includes a null symbol and a phase reference symbol PRS used for recognizing the start point of the frame. The high-speed information channel unit FIC includes three-symbol high-speed information blocks FIB1 to FIB3, and includes time / date data, ensemble labels (names indicating the contents of broadcast signals containing a plurality of services (programs)), service labels ( Including name of individual service content), service component label (name indicating more detailed content (program name) than service label), service sequence data, program type code (PTY) indicating program content, etc. Yes. The data field section DFL is divided into 72 data fields (symbols), and broadcast signals of predetermined services (programs) are inserted into the respective data fields, and 6 to 8 services (programs) are simultaneously received from one broadcasting station. The broadcast signal can be transmitted. Which service (program) corresponds to which data field is specified by service arrangement data included in the high-speed information channel unit FIC.

  Each high-speed information block FIB1 to FIB3 of the high-speed information channel FIC has a hierarchical structure, and each high-speed information block FIB includes a 256-bit FIB data field and a CRC (Cyclic Redundancy Code). The FIB data field includes a plurality of FIG data field groups (Fast Information Groups), and each FIG is composed of a FIG type, a FIG byte length (Length), and a FIG data field. Various data such as a program (program) type code PTY is inserted.

  FIG. 3 is a block diagram illustrating a functional configuration of a program switching program executed by the control unit 180. As described above, the program switching program 200 automatically switches to a broadcasting station that broadcasts the same program when the reception sensitivity of the broadcasting station of the program currently being received deteriorates. The program switching program 200 includes a switching determination unit 210, an alternative broadcast station search unit 220, a delay determination unit 230, an expansion degree setting unit 240, a time stretch control unit 250, and a program switching control unit 260.

  The switching determination unit 210 determines whether it is necessary to switch from the program of the currently receiving broadcast station to the program of another broadcast station. In a preferred example, the switching determination unit 210 determines whether to switch programs based on radio broadcast reception sensitivity. For example, when a broadcast station program received by the first tuner 110A, which is the main tuner, is being viewed, the switching determination unit 210 determines that the electric field strength signal from the first tuner 110A is equal to or less than a threshold value. Then, it is determined that the reception environment has deteriorated, and it is determined that the broadcast station needs to be switched. In addition to the above, when there is a user switching instruction from the input unit 160, the switching determination unit 210 may determine that switching is necessary.

  When the switching determination unit 210 determines that the program needs to be switched, in response to this, the alternative broadcast station search unit 220 searches for an alternative broadcast station that is broadcasting the same program as the currently received program. Execute. For example, the alternative broadcast station search unit 220 causes the second tuner 110B, which is a sub-tuner, to search for an alternative broadcast station with good reception sensitivity. For convenience of explanation, the program of the broadcast station that is currently received is referred to as “program A”, and the program of the broadcast station that is the switching destination is referred to as “program B”. The “program A” and “program B” are the same program.

  A method for searching for an alternative broadcasting station is not particularly limited. For example, when the first tuner 110A receives the program A by DAB broadcasting, another frequency band of DAB / DAB + broadcasting is assigned to the second tuner 110B. Scan and search for a receivable broadcasting station broadcasting the same program B as program A. At this time, it is determined whether program A and program B are the same by referring to program identification information such as program type (PTY), program name (PS), and program identification code (PI) included in DAB broadcasting. Can do. Alternatively, the second tuner 110B may be searched for an RDS analog FM broadcast. In this case, the program type (PTY), program name (PS), program identification code ( It is possible to determine whether or not the program is the same by referring to program identification information such as PI). Furthermore, in addition to the above, the method for determining whether or not the program is the same program captures a part of the broadcast signal received by the first tuner 110A and uses a part of the broadcast signal received by the second tuner 110B. It can also be done by capturing and comparing both signals.

  As another search method, when the second tuner 110B creates a frequency list (AF) of the same program by a background operation, an alternative broadcast station may be searched according to the frequency list. As another method, when the currently received broadcast signal includes program guide information broadcasting the same program B as the program A, an alternative broadcast station based on the program guide information You may make it search.

  When an alternative broadcast station that broadcasts the same program B as the program A is found, the alternative broadcast station search unit 220 causes the second tuner 110B to start receiving the program B. The received broadcast signal is processed by the signal processing unit 120 and stored in a buffer memory or the like.

  The delay determination unit 230 determines whether or not the program B after switching is delayed with respect to the program A currently received. The delay determination unit 230 causes the signal processing unit 120 to capture the broadcast signal of the program A received by the first tuner 110A for a certain period and the broadcast signal of the program B received by the second tuner 110B for a certain period. The captured signals are compared, the captured signals are compared, and the time point at which both of them are reproduced is detected, so that the program B is delayed with respect to the program A and the time difference between the program A and the program B is calculated. . For example, as shown in FIG. 8, the time difference (T1-T2) between service 1 and service 2 is calculated.

  The extension degree setting unit 240 sets the extension degree when executing time stretching. The decompression degree setting unit 240 sets the decompression degree according to the contents of the currently received program. In other words, if the contents of the program are sensitive to the slow playback speed, the decompression degree is set to the relative degree. On the other hand, if the content of the program is not sensitive to a delay in the playback speed, the degree of expansion is set large. More specifically, the expansion degree setting unit 240 determines the content of the program based on, for example, the program type (PTY) as the program identification information, and if the content of the program belongs to a music program, the expansion degree is set small. However, when the content of the program belongs to an audio program (for example, news, drama, etc.), the expansion degree is set large.

  In this embodiment, the storage unit 150 stores in advance a table that defines the relationship between the program type (PTY) and the degree of expansion. FIG. 4 shows an example of the table. For example, it is assumed that the degree of extension by time stretch can be set in the range of 1 to 10%. The degree of expansion is determined in advance for each program type (PTY) that can be acquired from DAB broadcasting or RDS broadcasting. For example, when the program type is news, current affairs, information, sports, education, drama, culture, science, etc., the degree of expansion is set to the maximum 10%. These program contents are audio broadcasts that do not cause a great sense of incongruity even if the playback speed is delayed relatively large. On the other hand, when the program type is pop music, rock music, easy listening music or the like, the degree of expansion is set to 5%, which is smaller than that of the audio program. These program contents are music programs that are likely to cause a sense of incongruity when the playback speed is relatively delayed. If the program type cannot be acquired, the degree of expansion is set to 5%, which is the same as the music program. In addition, the value of the extension degree shown here is an example, and the range of the extension degree is also an example. In addition, the relationship between the program type (PTY) and the degree of expansion is defined here, but if it is possible to determine the contents of the program from program identification information other than the program type (PTY), such a program A table that defines the relationship between the identification information and the degree of expansion may be prepared.

  The time stretch control unit 250 controls the delay of the reproduction of the program currently received by the signal processing unit 120 according to the expansion degree set by the expansion degree setting 240. That is, the time stretch control unit 250 controls the playback speed of the audio signal played back by the signal processing unit 120 or the output speed of the audio signal output from the signal processing unit 120 according to the degree of expansion. The method for delaying the reproduction is not particularly limited. For example, the signal processing unit 120 accumulates the decoded audio signal in the buffer memory, and delays the reading speed of the audio data from the buffer memory.

  The program switching control unit 260 performs switching from the program A of the currently received broadcasting station to the program B of the switching destination broadcasting station after execution of time stretching. That is, the program switching control unit 260 causes the first tuner 110A to switch the broadcasting station from the program A to the program B after the time when the currently received program A and the switching destination program B are synchronized. The time point at which the program A and the program B are synchronized is, for example, a value obtained by dividing the time difference calculated by the delay determination unit 230 by the expansion degree (time difference / expansion degree), that is, the time when the adjustment time has elapsed. Thereby, the sound of the program B synchronized with the program A is seamlessly output from the speaker 132.

  In the above example, the first tuner 110A, which is the main tuner, switches from the program A to the program B. In addition to this, for example, the first tuner 110A receives the switching of the program. The audio signal of the program A may be prevented from being output from the signal processing unit 120, and the audio signal of the program B received by the second tuner 110B may be output from the signal processing unit 120.

  FIG. 5 is a flowchart for explaining a program switching operation in the in-vehicle apparatus of the present embodiment. Here, it is assumed that the broadcast signal received by the first tuner 110A that is the main tuner is output, and the second tuner 110B that is the sub-tuner searches for an alternative broadcast station.

  First, the program A is received by the first tuner 110A, and the sound of the program A is output from the speaker 132 (S100). While receiving the program A, the switching determination unit 210 monitors whether or not switching to another broadcasting station is necessary (S102). For example, if a failure such as multipath occurs while the vehicle is moving, or if the vehicle is out of the reception area, the electric field strength signal falls below a threshold value, and it is determined that switching between broadcast stations is necessary. The deterioration of the reception sensitivity may be determined with reference to information other than the electric field strength signal, such as an error rate of the received broadcast signal.

  If the switching determination unit 210 determines that switching is necessary, the alternative broadcast station search unit 220 causes the second tuner 110B to search for an alternative broadcast station that is broadcasting the same program B (S104). If an alternative broadcast station that broadcasts program B is not found, the process ends. When an alternative broadcast station that broadcasts program B with good reception sensitivity is found (S106), the delay determination unit 230 determines whether or not program B is delayed with respect to program A (S108). . When the program B is not delayed from the program A, the process is terminated because the time stretch of the program A is unnecessary. When it is determined that the program B is delayed with respect to the program A, the time difference (T1−T2) is calculated at the same time, and then the expansion degree according to the program type is set by the expansion degree setting unit 240. (S110). That is, the expansion degree setting unit 240 sets the expansion degree with reference to the table shown in FIG. 4 based on the program type (PTY) of the program A.

  When the expansion degree is set, the time stretch control unit 250 executes time stretching of the currently received program A according to the set expansion degree. That is, the signal processing unit 120 delays the reproduction of the program A according to the degree of expansion (S112). When the time stretching is finished, in other words, when the adjustment time is finished and the programs A and B are synchronized, the program switching control unit 260 switches the program A to the program B to the first tuner 110A. Instruct. As a result, the first tuner 110 starts receiving the program B, and the sound of the program B processed through the signal processing unit 120 and the amplifier 130 is output from the speaker 132 (S116).

  If a broadcast station that broadcasts program B is not found (including a case where the reception sensitivity of program B is not good), program switching program 200 switches to a program that is not the same as program A. It is also possible to do this. Further, when the program A and the program B are synchronized from the beginning, or when the program B is not delayed from the program A, the program B is immediately switched to the program B without performing time stretching. In the latter case, after switching, the sound of the program A stored in the buffer memory for a period corresponding to the time difference between the program A and the program B is output first, and then the program B stored in the inter-synchronization buffer memory Audio output is started, and the audio of program A and program B is seamlessly output.

  FIG. 6 shows a specific example of the program switching operation of this embodiment. The time difference between the program A and the program B is 6 seconds, and the upper part shows an example in which a music program is extended with an expansion degree of 5%, and the lower part shows an example in which an audio program is extended with an expansion degree of 10%. Is shown. Ts is the timing when the synchronization between the program A and the program B is completed. When the program type (PTY) is an audio program such as a news program or an information program, even if the degree of time stretch extension is increased (even if the playback speed is increased), there is little discomfort, so the adjustment time Ts until synchronization is shortened. This can shorten the time until program switching. On the other hand, if the program type (PTY) is a music program such as pop music or rock music, the degree of expansion is moderated and the uncomfortable feeling is reduced. Tp indicates that the time until the switching of the audio program is shortened rather than the music program. In this way, when there is a time difference between the same programs, changing the degree of time stretch or the playback speed according to the contents of the program reduces the time until switching as much as possible and is seamless with little discomfort. Realize program switching.

  FIG. 7 shows the relationship between the adjustment time (time difference / extension degree) and the playback speed of the time-stretched audio signal when the time stretch extension degree is changed when the time difference between programs is 6 seconds. ing. If the reproduction speed when the degree of expansion is 1% is S, the adjustment time is shortened and the reproduction speed is increased as the degree of expansion is increased.

  In this embodiment, switching between programs mainly in DAB / DAB + has been described. However, the present invention is applied to switching between analog broadcasting and digital broadcasting, such as FM broadcasting to DAB broadcasting, or DAB broadcasting to FM broadcasting. Also good.

  FIG. 9 is a block diagram showing a configuration example of an in-vehicle device having a radio reception function according to another embodiment of the present invention. The in-vehicle device 10A of this embodiment has a function of communicating with an external network or the like, and the Internet broadcast receiving unit 190 receives a broadcast program distributed on the Internet when connected to the Internet via the communication function. To do. Of the broadcast program data received by the Internet broadcast receiving unit 190, audio data is provided to the signal processing unit 120, where necessary processing is performed. When the switching determination unit 210 of the control unit 200 determines that the program needs to be switched, the alternative broadcast station search unit 220 selects the same program as the radio broadcast based on the program identification information included in the radio broadcast. Search for Internet broadcasts being distributed. The delay determining unit 230 determines whether or not there is a delay between the currently received radio broadcast program A and the searched Internet broadcast program B. The program B is delayed with respect to the program A. Then, the time stretch function is implemented by the same method as in the above embodiment, and the program B is synchronized with the program A.

  As a result, even when switching from radio broadcasting to Internet broadcasting, it is possible to switch programs as soon as possible without causing a sense of incongruity. In the above example, the alternative broadcast station search unit 220 searches the Internet broadcast that distributes the same program as the radio broadcast. If the site is known, the Internet broadcast receiving unit 190 can receive the simulcast from such a known site without searching for an alternative station.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications and variations are possible within the scope of the gist of the invention described in the claims. It can be changed.

10: In-vehicle device 100A: First antenna 100B: Second antenna 110A: First tuner 110B: Second tuner 120: Signal processing unit 130: Amplifier 132: Speaker 140: Display unit 150: Storage unit 160: Input Unit 170: I / F unit 180: control unit 200: program switching program 210: switching determination unit 220: alternative broadcast station search unit 230: delay determination unit 240: expansion degree setting unit 250: time stretch control unit 260: program switching Control unit

Claims (21)

An electronic device having a function of receiving a radio broadcast,
Receiving means for receiving radio broadcasts;
Reproduction means for reproducing the broadcast signal of the received radio broadcast;
Output means for outputting the sound of the reproduced broadcast signal;
Control means for controlling the reproduction means when switching from the program currently being received to the same program being broadcast by another broadcast station,
The control means determines whether or not the same program is delayed from the currently received program;
When the determination means determines that the program is delayed, the playback speed of the currently received program is set according to the content of the program so that the currently received program is synchronized with the same program. And an electronic device. An electronic device having a function of receiving a radio broadcast,
Receiving means for receiving radio broadcasts;
Reproduction means for reproducing the broadcast signal of the received radio broadcast;
Output means for outputting the sound of the reproduced broadcast signal;
Control means for controlling the reproduction means when switching from the program currently being received to the same program being broadcast by another broadcast station,
The control means determines whether or not the same program is delayed from the currently received program;
When the determination unit determines that the program is delayed, the currently received program is expanded according to the content of the program so as to eliminate the time difference between the currently received program and the same program. And setting means for setting a degree of expansion for the electronic device. The setting means sets the first playback speed or the first decompression degree when the content of the program belongs to the first type, and sets the second playback speed or the time when the content of the program belongs to the second type. The electronic device according to claim 1, wherein the second extension speed is set. The electronic apparatus according to claim 3, wherein the first type is a music program, the second type is an audio program, and the first playback speed is slower than the second playback speed. The electronic device according to claim 3, wherein the first type is a music program, the second type is an audio program, and the first extension degree is smaller than the second extension degree. The said setting means contains the table which prescribed | regulated the content of the program, and the reproduction speed or expansion | extension degree corresponding to the content of the said program, The said setting means sets a reproduction | regeneration speed or expansion | extension degree according to the said table. 5. The electronic device according to any one of 5. The electronic device according to claim 1, wherein the setting unit identifies the content of a program based on program identification information included in a currently received broadcast signal. The control means further includes a switching control means for controlling switching of the receiving means, and the switching control means causes the other broadcast station to receive after the currently received program is synchronized with the same program. An electronic device according to any one of claims 1 to 7. The determination means calculates a time difference between the two programs by comparing the broadcast signal of the currently received program and the broadcast signal of the same program, and the switching control means is configured to calculate the time difference and the degree of expansion, or the The electronic device according to claim 1, wherein the other broadcast station is received after the elapse of a reproduction time determined from a time difference and the reproduction speed. 10. The electronic device according to claim 1, wherein the electronic device includes a communication unit that communicates with an external network, and the other broadcast station is a broadcast station that distributes a program via the communication unit. Electronic equipment. The receiving means includes a first receiving means and a second receiving means, and when the first receiving means is receiving a current program, the second receiving means is the same as the current program. The electronic device according to claim 1, wherein the electronic device searches for a program. A program switching program executed by an electronic device having a function of receiving a radio broadcast,
Determining whether or not the same program is delayed from the currently received program when switching from the currently received program to the same program being broadcast by another broadcast station;
When it is determined that the program is delayed, the degree of expansion for expanding the currently received program is increased according to the contents of the program so as to eliminate the time difference between the currently received program and the same program. Steps to set,
Switching to the same program of the other broadcast station after decompression of the currently received program;
A switching program. The setting step sets a first expansion degree when the content of the program belongs to the first type, and sets a second expansion speed when the content of the program belongs to the second type. 12. The switching program according to 12. The switching program according to claim 13, wherein the first type is a music program, the second type is an audio program, and the first extension degree is smaller than the second extension degree. The switching program according to any one of claims 12 to 14, wherein the setting step sets the expansion degree according to a table that defines the content of the program and the playback speed or the expansion degree corresponding to the content of the program. 16. The switching program according to claim 12, wherein the setting step identifies the content of a program based on program identification information included in a currently received broadcast signal. A program switching method in an electronic device having a function of receiving a radio broadcast,
Determining whether or not the same program is delayed from the currently received program when switching from the currently received program to the same program being broadcast by another broadcast station;
When it is determined that the program is delayed, the degree of expansion for expanding the currently received program is increased according to the contents of the program so as to eliminate the time difference between the currently received program and the same program. Steps to set,
Switching to the same program of the other broadcast station after decompression of the currently received program;
A switching method. The setting step sets a first expansion degree when the content of the program belongs to the first type, and sets a second expansion speed when the content of the program belongs to the second type. 18. The switching method according to item 17. The switching method according to claim 18, wherein the first type is a music program, the second type is an audio program, and the first extension degree is smaller than the second extension degree. 20. The switching method according to claim 17, wherein the setting step sets the expansion degree according to a table defining a program content and a reproduction speed or expansion degree corresponding to the content of the program. 21. The switching method according to claim 17, wherein the setting step identifies the content of a program based on program identification information included in a currently received broadcast signal.

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