JP6404159B2 - Broadcast receiving apparatus and output control method - Google Patents

Description

  The present invention relates to a broadcast receiving apparatus and an output control method, and in particular, broadcast reception adapted to selectively switch between a first standard broadcast and a second standard broadcast delayed from the first standard broadcast. It is suitable for use in an apparatus and an output control method.

  2. Description of the Related Art Conventionally, there has been provided a broadcast receiving apparatus that is capable of receiving two broadcasts having the same content but different standards and selectively switching and outputting the two broadcasts. For example, there is known a hybrid broadcast in which an analog FM broadcast or a digital DAB (Digital Audio Broadcast) broadcast (hereinafter referred to as FM / DAB broadcast) and an Internet IP (Internet Protocol) broadcast are fused. In this hybrid broadcasting, when the reception environment of FM / DAB broadcasting deteriorates, it is switched to IP broadcasting and output. As a result, the user can continue to listen to the same content broadcast.

  By the way, although the audio data of FM / DAB broadcasting and the audio data of IP broadcasting have the same contents, IP broadcasting is transmitted from a broadcasting station to a broadcast receiving device via a provider, an Internet server, etc. Received after FM / DAB broadcasting. Therefore, conventionally, a technique has been devised that eliminates the time difference between two broadcasts and synchronizes the output timings of the two broadcasts (see, for example, Patent Document 1). In particular, a technique that enables seamless switching between two broadcasts, a so-called seamless link function is known.

  FIG. 7 is a diagram illustrating an operation example of the seamless link function. In the seamless link function, as shown in FIG. 7, by performing delay processing (referred to as time stretch processing) on audio data of FM / DAB broadcast so that switching from FM / DAB broadcast to IP broadcast is seamless, The output timing of the FM / DAB broadcast audio data is synchronized with the output timing of the IP broadcast audio data. The example of FIG. 7 shows a state in which FM / DAB broadcast audio data is buffered and time stretch processing is performed to delay the output timing of FM / DAB broadcast by 20 seconds to synchronize with IP broadcast.

JP 2013-539092 A

  By the way, in the case of long-distance driving with a vehicle equipped with a broadcast receiving device, the vehicle may move across broadcast areas (receivable areas) of a plurality of broadcast stations. In this case, when moving beyond an FM / DAB broadcast receivable area, the reception environment of the FM / DAB broadcast deteriorates (reception sensitivity decreases), so switching to IP broadcast is performed. At this time, if the seamless link function is used, switching from FM / DAB broadcasting to IP broadcasting having the same content can be performed seamlessly without causing a time difference in the output sound. In other words, there is an advantage that you can seamlessly listen to the same content broadcast anywhere.

  However, when the seamless link function is used, a delay occurs in the output of FM / DAB broadcast audio data as described above. For this reason, there has been a problem that the real-time property in time broadcasting, live relay broadcasting, and the like is impaired. In particular, when the vehicle is moving in an area where FM / DAB broadcasting can continue to be received, the demerit that the real-time performance is impaired rather than the merit of the seamless link function that allows the broadcasting to be switched seamlessly. Will stand out.

  The present invention has been made to solve such problems, and performs seamless switching when switching broadcasts due to deterioration of the reception environment while ensuring the real-time output sound. The purpose is to be able to.

In order to solve the above-described problems, the present invention synchronizes the output timing of the broadcast data of the first standard with the output timing of the broadcast data of the second standard by performing delay processing on the broadcast data of the first standard. In a broadcast receiving apparatus comprising a delay processing unit and an output control unit that selectively switches to either a first standard broadcast or a second standard broadcast and outputs broadcast data, the first broadcast from the first standard broadcast It is determined whether or not it is an environment that requires switching to a two-standard broadcast. If the environment requires switching, the first mode that enables the function of the delay processing unit is set, while switching is necessary. If the environment is not to be set, the second mode is set to disable the function of the delay processing unit. When determining whether or not the environment requires switching, it is possible to determine whether or not the destination is outside the coverage area of the first standard broadcast that can be received near the home, and the destination can be received. If it is outside the area, it is determined that the environment requires switching. If the destination is not outside the receivable area, it is determined that the environment does not require switching.

  According to the present invention configured as described above, in an environment that requires switching from broadcasting of the first standard to broadcasting of the second standard, the function of the delay processing unit is effective by setting the first mode. Become. For this reason, when the switching from the first standard broadcasting to the second standard broadcasting is actually performed because the reception environment of the first standard broadcasting has deteriorated, seamless switching is performed by the functions of the delay processing unit and the output control unit. It can be performed. On the other hand, if the environment does not require switching from the first standard broadcast to the second standard broadcast, the first standard broadcast is not actually switched to the second standard broadcast. Standard broadcast data continues to be output. In this case, since the function of the delay processing unit is disabled by the setting of the second mode, the output timing of the broadcast data of the first standard is not delayed, and the real-time property of the output audio can be ensured. As described above, according to the present invention, seamless switching can be performed when the reception environment is deteriorated and broadcasting is switched while securing the real-time output sound.

It is a block diagram which shows the function structural example of the broadcast receiving apparatus by 1st Embodiment. It is a flowchart which shows the operation example of the broadcast receiving apparatus by 1st Embodiment. It is a block diagram which shows the function structural example of the broadcast receiving apparatus by 2nd Embodiment. It is a flowchart which shows the operation example of the broadcast receiving apparatus by 2nd Embodiment. It is a block diagram which shows the function structural example of the broadcast receiving apparatus by 3rd Embodiment. It is a flowchart which shows the operation example of the broadcast receiving apparatus by 3rd Embodiment. It is a flowchart which shows the operation example of a seamless link function.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a functional configuration example of the broadcast receiving apparatus 100 according to the first embodiment. The broadcast receiving apparatus 100 shown in FIG. 1 receives a DAB broadcast (an example of a first standard broadcast) and an IP broadcast (an example of a second standard broadcast), and receives the received DAB broadcast audio and IP broadcasts. This is a device that can selectively switch between sound and output to the speaker 12.

  An amplifier 11 is connected to the broadcast receiving apparatus 100, and a speaker 12 is connected to the amplifier 11. The broadcast receiving apparatus 100 is connected to a navigation apparatus 13 that performs movement guidance. Here, the broadcast receiving device 100 and the navigation device 13 are described as separate units, but they may be integrated.

  As shown in FIG. 1, the broadcast receiving apparatus 100 according to the first embodiment includes a first receiving unit 101, a first demodulating unit 102, a DAB buffer 103, a second receiving unit 104, a second demodulating unit 105, and an IP buffer 106. A delay time calculation unit 107, a delay processing unit 108, an output control unit 109, a destination information acquisition unit 111, a reception environment determination unit 112, and a mode control unit 113.

  Each of the functional blocks 101 to 113 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the functional blocks 101 to 113 is actually configured by including a CPU, RAM, ROM, etc. of a computer, and stored in a recording medium such as RAM, ROM, hard disk, or semiconductor memory. Is realized by operating.

  The first receiver 101 receives a DAB broadcast wave. The first demodulator 102 demodulates the DAB broadcast wave received by the first receiver 101. The DAB buffer 103 temporarily stores audio data included in the DAB broadcast (DAB broadcast demodulated by the first demodulator 102) received by the first receiver 101.

  The second receiver 104 receives IP broadcast communication data. The second demodulator 105 demodulates the IP broadcast communication data received by the second receiver 104. The IP buffer 106 temporarily stores audio data included in the IP broadcast received by the second receiver 104 (the IP broadcast demodulated by the second demodulator 105).

  The capacity of the DAB buffer 103 is designed to be larger than the capacity of the IP buffer 106. This is because the DAB broadcast audio data stored in the DAB buffer 103 includes the same data as the IP broadcast audio data received later than the DAB broadcast and stored in the IP buffer 106. It is necessary to make it.

  The IP broadcast received by the second receiver 104 has the same content as the DAB broadcast received by the first receiver 101. However, the IP broadcast received by the second receiving unit 104 is received with a delay from the DAB broadcast received by the first receiving unit 101. While the first receiving unit 101 directly receives DAB broadcast waves, the second receiving unit 104 receives IP broadcast communication data transmitted from a broadcast station via a provider, an Internet server, or the like. Because.

  The output control unit 109 receives the audio data of the DAB broadcast (DAB broadcast demodulated by the first demodulator 102) received by the first receiver 101 and the IP broadcast (second demodulator) received by the second receiver 104. The IP data after demodulation by the unit 105 is selectively switched and output. For example, when the reception sensitivity of the DAB broadcast is higher than a predetermined value, the output control unit 109 switches to the DAB broadcast and outputs it. On the other hand, the output control unit 109 switches to the IP broadcast and outputs when the reception sensitivity of the DAB broadcast falls below a predetermined value. The audio data output from the output control unit 109 is amplified by the amplifier 11 and output from the speaker 12 as audio.

  Whether or not the DAB broadcast reception sensitivity falls below a predetermined value can be determined, for example, based on whether or not the BER (Bit Error Rate) of the broadcast data demodulated by the first demodulator 102 is greater than a predetermined value. Is possible.

  The delay time calculation unit 107 compares the DAB broadcast audio data stored in the DAB buffer 103 with the IP broadcast audio data stored in the IP buffer 106 to calculate the IP broadcast delay time for the DAB broadcast. To do. Specifically, the delay time calculation unit 107 searches for and identifies the same data as the audio data stored in the IP buffer 106 having a small capacity from the DAB buffer 103 having a large capacity. From the difference in reception timing, the time difference between the DAB broadcast and the IP broadcast, that is, the delay time of the IP broadcast with respect to the DAB broadcast is calculated.

  The delay processing unit 108 performs delay processing (time stretch) on the DAB broadcast audio data stored in the DAB buffer 103 according to the delay time calculated by the delay time calculation unit 107. Thus, the delay processing unit 108 synchronizes the output timing of the DAB broadcast audio data output from the output control unit 109 with the output timing of the IP broadcast audio data output from the output control unit 109.

  The destination information acquisition unit 111 acquires destination information from the navigation device 13. For example, when the destination is set when the navigation device 13 performs a route search, the destination information acquisition unit 111 acquires destination information representing the destination. The destination information to be acquired is latitude / longitude information, for example. Or address information may be sufficient.

  The reception environment determination unit 112 determines whether the reception environment of the DAB broadcast is an environment that requires switching from the DAB broadcast to the IP broadcast. In the first embodiment, when the destination information acquisition unit 111 acquires destination information, the reception environment determination unit 112 receives a DAB broadcast that is currently being received by the destination indicated by the destination information. It is determined whether or not it is outside a possible area (hereinafter referred to as a currently receivable area). If the destination is outside the currently receivable area, it is determined that the environment requires switching to IP broadcasting. On the other hand, if the destination is not outside the currently receivable area, it is determined that the environment does not require switching to IP broadcasting.

  The term “environment that requires switching to IP broadcasting” does not mean that it is necessary to immediately switch to IP broadcasting when the destination is set. This means that it is necessary to switch to IP broadcasting when going outside the currently receivable area of DAB broadcasting. In other words, it is an environment where it is known in advance that it is certain that it will be outside the currently receivable area and that it will be impossible to receive DAB broadcasts if it goes out of the area.

  In order to be able to determine whether the destination is outside the currently receivable area of the DAB broadcast, the reception environment determining unit 112 has area information that can identify each receivable area of the DAB broadcast. Yes. The reception environment determination unit 112 compares the area information with the destination information acquired by the destination information acquisition unit 111 to determine whether the destination is outside the currently receivable area of the DAB broadcast. judge.

  When the reception environment determination unit 112 determines that the environment needs to be switched from DAB broadcasting to IP broadcasting, the mode control unit 113 is a synchronization that enables the functions of the delay time calculation unit 107 and the delay processing unit 108. Set the ON mode (corresponding to the first mode). On the other hand, when the reception environment determination unit 112 determines that the environment does not require switching from DAB broadcasting to IP broadcasting, the mode control unit 113 disables the functions of the delay time calculation unit 107 and the delay processing unit 108. A synchronous OFF mode (corresponding to the second mode) is set.

  When the synchronous ON mode is set, that is, when the destination is set outside the currently receivable area of the DAB broadcast, the time stretch process is executed by the delay processing unit 108 for the currently received DAB broadcast. Is done. Thereby, the broadcast receiving apparatus 100 ensures a state where the output timing of the DAB broadcast and the output timing of the IP broadcast are synchronized. That is, when the reception sensitivity of the DAB broadcast deteriorates due to going out of the currently receivable area of the DAB broadcast with this movement, it is possible to perform seamless switching without a time difference from the DAB broadcast to the IP broadcast. A state can be secured.

  On the other hand, when the second mode is set, when the destination is set inside the currently receivable area of DAB broadcasting, or the destination information acquisition unit 111 acquires the destination information from the navigation device 13. This is applicable when the destination is not set (when the destination is not set). In these cases, the time stretch process by the delay processing unit 108 is not executed. This is because the reception sensitivity of the currently receiving DAB broadcast does not deteriorate, and there is a high possibility that the DAB broadcast can be continuously received, and switching to the IP broadcast is considered unnecessary. Since time stretch processing is not performed, the real-time property of the sound of the DAB broadcast to be output can be ensured.

  FIG. 2 is a flowchart showing an operation example of the broadcast receiving apparatus 100 according to the first embodiment configured as described above. Note that the flowchart shown in FIG. 2 starts when the power of the broadcast receiving apparatus 100 is turned on.

  When the power of the broadcast receiving apparatus 100 is turned on, in parallel with the flowchart shown in FIG. 2, processing related to reception of DAB broadcast and storage of its audio data in the DAB buffer 103, reception of IP broadcast, and its Processing related to storage of audio data in the IP buffer 106 is executed. In parallel with this processing, first, the output control unit 109 selects DAB broadcast audio data output from the first demodulation unit 102 and outputs the audio data to the amplifier 11 (step S1).

  Next, the destination information acquisition unit 111 determines whether or not the destination information has been acquired from the navigation device 13 (step S2). When the destination information acquisition unit 111 acquires the destination information, it is determined whether or not the destination is outside the currently receivable area of the DAB broadcast (step S3). When the destination is outside the currently receivable area, the mode control unit 113 sets the synchronous ON mode for the delay time calculation unit 107 and the delay processing unit 108 (step S4).

  When the synchronous ON mode is set, the delay time calculation unit 107 compares the DAB broadcast audio data stored in the DAB buffer 103 with the IP broadcast audio data stored in the IP buffer 106 to obtain a DAB The delay time of IP broadcasting with respect to broadcasting is calculated (step S5). Furthermore, the delay processing unit 108 performs time stretching processing on the DAB broadcast audio data stored in the DAB buffer 103 according to the delay time calculated by the delay time calculation unit 107 (step S6). As a result, the output timing of the DAB broadcast and the output timing of the IP broadcast are synchronized.

  On the other hand, if it is determined in step S2 that the destination information acquisition unit 111 has not acquired destination information, and if it is determined in step S3 that the destination is not outside the currently receivable area. The mode control unit 113 sets the synchronous OFF mode for the delay time calculation unit 107 and the delay processing unit 108 (step S7). When the synchronous OFF mode is set, the processes in steps S5 and S6 are not performed. Thereby, the output timing of DAB broadcasting is not delayed.

  After the process of step S6 or step S7, the output control unit 109 determines whether or not the DAB broadcast reception sensitivity is equal to or lower than a predetermined value (step S8). For example, when the current position is within the currently receivable area of the DAB broadcast, the DAB broadcast reception sensitivity does not fall below a predetermined value. In this case, the determination process in step S8 is repeatedly executed.

  On the other hand, if the current position goes outside the currently receivable area of the DAB broadcast due to the movement to the destination, the reception sensitivity of the DAB broadcast deteriorates to a predetermined value or less. In this case, the output control unit 109 switches the sound output to the amplifier 11 from DAB broadcasting to IP broadcasting (step S9). Thereby, the process of the flowchart shown in FIG. 2 is completed.

  As described above in detail, in the first embodiment, when the destination information is acquired from the navigation device 13, the destination indicated by the destination information is outside the currently receivable area of the DAB broadcast. Whether or not it is an environment that requires switching from DAB broadcasting to IP broadcasting. When the destination is outside the currently receivable area, the functions of the delay time calculating unit 107 and the delay processing unit 108 are enabled by setting the synchronous ON mode, and when the destination is within the currently receivable area. The functions of the delay time calculation unit 107 and the delay processing unit 108 are invalidated by setting the synchronous OFF mode.

  According to the first embodiment configured as described above, when the destination is set outside the currently receivable area, the DAB broadcast and the IP broadcast are synchronized by delaying the DAB broadcast. When the current position actually moves outside the currently receivable area as the destination is moved, the DAB broadcast reception sensitivity deteriorates to a predetermined value or less, so that the DAB broadcast is switched to the IP broadcast. . When this switching is performed, seamless switching without time difference can be performed in a state where the DAB broadcast and the IP broadcast are synchronized.

  On the other hand, if the destination is currently set within the receivable area, even if the destination moves toward the destination, the reception sensitivity does not deteriorate below a predetermined value. The audio data of DAB broadcasting continues to be output. In addition, when the destination is not set, it is highly likely that the user is moving around his / her home, and the reception sensitivity does not deteriorate to a predetermined value or less outside the currently receivable area of DAB broadcasting. It is done. Also in this case, the DAB broadcast is not actually switched to the IP broadcast, and the DAB broadcast audio data continues to be output. In these cases, since the DAB broadcast delay process (time stretch process) is not performed, the output timing of the DAB broadcast is not delayed, and the real-time property of the output audio can be ensured.

  As described above, according to the first embodiment, the real-time property of the output sound is ensured within the currently receivable area of the DAB broadcast, while the reception sensitivity is deteriorated outside the currently receivable area, and the DAB broadcast to the IP broadcast. When switching to, seamless switching can be performed.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram illustrating a functional configuration example of the broadcast receiving apparatus 100 ′ according to the second embodiment. 3 that have the same reference numerals as those shown in FIG. 1 have the same functions, redundant description thereof will be omitted here.

  As shown in FIG. 3, the broadcast receiving apparatus 100 ′ according to the second embodiment does not include the destination information acquisition unit 111. Further, a reception environment determination unit 112 ′ and a mode control unit 113 ′ are provided instead of the reception environment determination unit 112 and the mode control unit 113.

  The reception environment determination unit 112 'determines whether or not the reception sensitivity of the currently receiving DAB broadcast has become equal to or lower than a predetermined value. When the reception sensitivity is equal to or lower than a predetermined value, it is determined that the environment needs to be switched from DAB broadcasting to IP broadcasting. On the other hand, if the reception sensitivity is not below the predetermined value, it is determined that the environment does not require switching from DAB broadcasting to IP broadcasting. Note that whether or not the reception sensitivity is equal to or lower than a predetermined value can be determined based on, for example, whether or not the BER of the broadcast data demodulated by the first demodulator 102 is higher than a predetermined value.

  The mode control unit 113 ′ sets a synchronous OFF mode that disables the functions of the delay time calculation unit 107 and the delay processing unit 108 when the reception sensitivity of the currently received DAB broadcast is greater than a predetermined value. For example, in the initial state immediately after turning on the power of the broadcast receiving apparatus 100 ′, the mode control unit 113 sets the synchronous OFF mode. On the other hand, the mode control unit 113 ′ sets a synchronous ON mode in which the functions of the delay time calculation unit 107 and the delay processing unit 108 are validated when the DAB broadcast reception sensitivity becomes a predetermined value or less.

  FIG. 4 is a flowchart showing an operation example of the broadcast receiving apparatus 100 ′ according to the second embodiment configured as described above. The flowchart shown in FIG. 4 starts when the power of the broadcast receiving apparatus 100 ′ is turned on.

  When the power of the broadcast receiving apparatus 100 ′ is turned on, in parallel with the flowchart shown in FIG. 4, processing related to reception of DAB broadcast and storage of the audio data in the DAB buffer 103, reception of IP broadcast, and Processing related to storing the audio data in the IP buffer 106 is executed.

  In parallel with this processing, the mode control unit 113 ′ first sets the synchronous OFF mode for the delay time calculation unit 107 and the delay processing unit 108 (step S <b> 11). Further, the output control unit 109 selects the DAB broadcast audio data output from the first demodulation unit 102 and outputs the selected audio data to the amplifier 11 (step S12).

  Next, the reception environment determination unit 112 'determines whether or not the DAB broadcast reception sensitivity is equal to or lower than a predetermined value (step S13). For example, when the current position is within the currently receivable area of the DAB broadcast, the DAB broadcast reception sensitivity does not fall below a predetermined value. In this case, the determination process in step S13 is repeatedly executed.

  On the other hand, if the current position moves outside the currently receivable area of the DAB broadcast due to movement, the reception sensitivity of the DAB broadcast deteriorates to a predetermined value or less. In this case, the reception environment determination unit 112 'determines that the DAB broadcast reception sensitivity is equal to or lower than a predetermined value (step S13). Then, the mode control unit 113 'sets the synchronous ON mode for the delay time calculation unit 107 and the delay processing unit 108 (step S14).

  When the synchronous ON mode is set, the delay time calculation unit 107 compares the DAB broadcast audio data stored in the DAB buffer 103 with the IP broadcast audio data stored in the IP buffer 106 to obtain a DAB The delay time of the IP broadcast with respect to the broadcast is calculated (step S15).

  Furthermore, the delay processing unit 108 performs time stretching processing on the DAB broadcast audio data stored in the DAB buffer 103 according to the delay time calculated by the delay time calculation unit 107 (step S16). Thereby, the output timing of DAB broadcasting and the output timing of IP broadcasting are synchronized.

  Then, in a state where the output timing of the DAB broadcast and the output timing of the IP broadcast are synchronized in this way, the output control unit 109 switches the sound output to the amplifier 11 from the DAB broadcast to the IP broadcast (step S17). Thereby, the process of the flowchart shown in FIG. 4 is completed.

  As described above in detail, in the second embodiment, in the initial state where the power of the broadcast receiving device 100 ′ is turned on, the functions of the delay time calculation unit 107 and the delay processing unit 108 are disabled by setting the synchronous OFF mode. And After that, it is determined whether or not the DAB broadcast reception sensitivity has deteriorated, that is, whether or not it is necessary to immediately switch from the DAB broadcast to the IP broadcast. If the reception sensitivity deteriorates, the synchronization is ON. After switching to the mode and enabling the functions of the delay time calculation unit 107 and the delay processing unit 108, the time stretch processing is executed.

  According to the second embodiment configured as described above, as long as the reception sensitivity is good, the DAB broadcast is not switched to the IP broadcast, and the DAB broadcast audio data is continuously output. In this case, since the DAB broadcast delay process (time stretch process) is not performed, the output timing of the DAB broadcast is not delayed, and the real-time property of the output audio can be ensured. On the other hand, when the reception sensitivity deteriorates, the DAB broadcast is delayed to synchronize with the IP broadcast and then switched from the DAB broadcast to the IP broadcast. Therefore, seamless switching without time difference can be performed.

  As described above, according to the second embodiment, when the reception sensitivity is good within the receivable area of the currently receiving DAB broadcast, the reception sensitivity is secured outside the receivable area while ensuring the real time property of the output sound. When switching from DAB broadcasting to IP broadcasting is worsened, seamless switching can be performed.

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram showing a functional configuration example of the broadcast receiving apparatus 100 ″ according to the third embodiment. In FIG. 5, the same reference numerals as those shown in FIG. Since it has a function, the overlapping description is omitted here.

  As shown in FIG. 5, the broadcast receiving apparatus 100 ″ according to the third embodiment further includes a home information acquisition unit 114. Further, instead of the reception environment determination unit 112 and the mode control unit 113, a reception environment determination unit. 112 ″ and a mode control unit 113 ″.

  The home information acquisition unit 114 acquires home information from the navigation device 13. For example, when a destination is set when performing a route search in the navigation device 13, the destination information acquisition unit 111 acquires the destination information and the home information acquisition unit 114 acquires the home information. The home information to be acquired is, for example, latitude / longitude information or address information.

  When the destination information acquisition unit 111 and the home information acquisition unit 114 acquire the destination information and the home information, the reception environment determination unit 112 ″ indicates the destination indicated by the destination information as the home information. It is determined whether or not it is outside a DAB broadcast receivable area that can be received near the home (hereinafter referred to as a receivable area near the home), and if the destination is outside the receivable area near the home On the other hand, if the destination is not outside the receivable area near the home, it is determined that the environment does not require switching to IP broadcasting.

  The mode control unit 113 ″ enables the functions of the delay time calculation unit 107 and the delay processing unit 108 when the reception environment determination unit 112 determines that the environment needs to be switched from DAB broadcasting to IP broadcasting. On the other hand, if the reception environment determining unit 112 determines that the environment does not require switching from DAB broadcasting to IP broadcasting, the functions of the delay time calculating unit 107 and the delay processing unit 108 are disabled. However, in the third embodiment, the synchronous OFF mode is set when the reception sensitivity of the DAB broadcast that can be received within the receivable area near the home is larger than a predetermined value.

  According to the third embodiment having the above functions, time stretch processing is not performed if a destination is set in a receivable area relating to any one of a plurality of DAB broadcasts that can be received near the home. Can be. As a result, for example, for a favorite DAB broadcast that is often viewed near home (for example, a multi-station DAB broadcast registered in a preset memory), the seamlessness at the time of switching from the DAB broadcast to the IP broadcast In addition, it is possible to preferentially ensure the real-time property of the output sound.

  In the third embodiment, when the current position is outside the receivable area near the home and the home is set as the destination, the destination is set in the receivable area near the home. It is possible to prevent the time stretch process from being performed in the receivable area near the home.

  In this case, the reception environment determination unit 112 ″ can receive near the home out of DAB broadcasts that can be received in the near-reception area based on the BER included in the DAB broadcast demodulated by the first demodulation unit 102. For the DAB broadcast having the same content as the IP broadcast being received at the current position outside the area, it is determined whether or not the reception sensitivity has become a predetermined value or more, and when it is determined that the reception sensitivity has become the predetermined value or more. The output control unit 109 switches the selection from IP broadcast to DAB broadcast and outputs broadcast data, and the mode control unit 113 ″ changes the setting from the synchronous ON mode to the synchronous OFF mode. As a result, the seamless link function is enabled when the user is outside the receivable area near the home, and the real time property of the output voice can be secured by disabling the seamless link function after entering the receivable area near the home.

  FIG. 6 is a flowchart showing an operation example of the broadcast receiving apparatus 100 ″ according to the third embodiment configured as described above. Note that the flowchart shown in FIG. It starts when the power supply of the receiving apparatus 100 ″ is turned on.

  When the power of the broadcast receiving apparatus 100 ″ is turned on, in parallel with the flowchart shown in FIG. 6, processing related to reception of DAB broadcast and storage of the audio data in the DAB buffer 103, reception of IP broadcast, and Processing related to storing the audio data in the IP buffer 106 is executed.

  When the current position is outside the receivable area near the home, the DAB broadcast reception sensitivity is equal to or lower than the predetermined value. First, the output control unit 109 first outputs the IP broadcast audio output from the second demodulation unit 105. Data is selected and output to the amplifier 11 (step S21).

  Next, the destination information acquisition unit 111 and the home information acquisition unit 114 determine whether or not the destination information and home information are received from the navigation device 13 (step S22). If the destination information and the home information are not received outside the near-home receivable area (area where the DAB broadcast reception sensitivity is a predetermined value or less), the process proceeds to step S24.

  On the other hand, when the destination information and the home information are received, it is determined whether or not the destination is outside the receivable area near the home (step S23). When the destination is outside the receivable area near the home, the mode control unit 113 ″ sets the synchronous ON mode to the delay time calculation unit 107 and the delay processing unit 108 (step S24).

  When the synchronous ON mode is set, the delay time calculation unit 107 compares the DAB broadcast audio data stored in the DAB buffer 103 with the IP broadcast audio data stored in the IP buffer 106 to obtain a DAB The delay time of the IP broadcast with respect to the broadcast is calculated (step S25).

  Furthermore, the delay processing unit 108 performs time stretching processing on the DAB broadcast audio data stored in the DAB buffer 103 according to the delay time calculated by the delay time calculating unit 107 (step S26). As a result, the output timing of the DAB broadcast and the output timing of the IP broadcast are synchronized.

  On the other hand, if it is determined in step S23 that the destination is not outside the receivable area near the home, the reception environment determining unit 112 " It is determined whether or not the reception sensitivity of the DAB broadcast having the same content as the IP broadcast being received at the current position outside the nearby receivable area has increased to a predetermined value or more (step S27). If not, the determination in step S27 is repeated.

  Thereafter, when the current position enters the area near the home due to the movement to the destination (home), the reception sensitivity of the DAB broadcast becomes a predetermined value or more. In this case, the mode control unit 113 ″ sets the synchronous OFF mode to the delay time calculation unit 107 and the delay processing unit 108 (step S28). Then, the output control unit 109 ″ outputs the audio output to the amplifier 11. Is switched from IP broadcast to DAB broadcast (step S29). In this case, the processing of the flowchart shown in FIG. 6 ends without performing the processing of the delay time calculation unit 107 and the delay processing unit 108 for the switched DAB broadcast.

  As described above in detail, in the third embodiment, when the destination information and the home information are acquired from the navigation device 13, it is determined whether or not the destination is outside the receivable area near the home. If the destination is outside the receivable area near the home, the functions of the delay time calculation unit 107 and the delay processing unit 108 are validated by setting the synchronous ON mode. On the other hand, when the destination is within the receivable area near the home, the synchronous OFF mode is set when the reception sensitivity of the DAB broadcast that can be received within the receivable area near the home becomes larger than a predetermined value. The functions of the delay time calculation unit 107 and the delay processing unit 108 are invalidated.

  According to the third embodiment configured as described above, when the destination is set outside the receivable area near the home, the DAB broadcast and the IP broadcast are synchronized by delaying the DAB broadcast. . When the current position actually moves outside the receivable area near the home as the destination is moved, the DAB broadcast reception sensitivity deteriorates to a predetermined value or less, so the DAB broadcast is switched to the IP broadcast. Is called. When this switching is performed, seamless switching without time difference can be performed in a state where the DAB broadcast and the IP broadcast are synchronized.

  On the other hand, when the destination is set inside the coverage area near the home, especially when the current position is outside the coverage area near the home and the destination is set at home. While moving toward the ground (home), when the reception sensitivity of the DAB broadcast that can be received in the receivable area near the home exceeds a predetermined value, switching from the IP broadcast to the DAB broadcast is performed. Since the synchronous OFF mode is set at the time of switching, DAB broadcast delay processing (time stretch processing) is not performed, and real-time performance of output audio can be ensured.

  As described above, according to the third embodiment, it is possible to perform seamless switching outside the receivable area near the home while securing the real-time output sound within the receivable area near the home.

  In the first to third embodiments, as an example of the first mode and the second mode, the synchronous ON mode in which the functions of the delay time calculation unit 107 and the delay processing unit 108 are enabled, and the delay time calculation unit 107 are used. In addition, the synchronous OFF mode in which the function of the delay processing unit 108 is disabled has been described, but the present invention is not limited to this. For example, in addition to the functions of the delay time calculation unit 107 and the delay processing unit 108, the hybrid ON mode that enables the function of the output control unit 109 is added to the functions of the first mode, the delay time calculation unit 107, and the delay processing unit 108. The hybrid OFF mode that disables the function of the output control unit 109 may be set as the second mode.

  In the first to third embodiments, the DAB broadcast is applied as the first standard broadcast and the IP broadcast is applied as the second standard broadcast. However, the present invention is not limited to this. For example, FM broadcast may be applied as the first standard broadcast, and IP broadcast may be applied as the second standard broadcast. Further, DAB broadcast may be applied as the first standard broadcast, and FM broadcast may be applied as the second standard broadcast.

  In addition, each of the first to third embodiments described above is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. It will not be. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

100, 100 ', 100 "broadcast receiving apparatus 101 first receiving unit 102 first demodulating unit 103 DAB buffer 104 second receiving unit 105 second demodulating unit 106 IP buffer 107 delay time calculating unit 108 delay processing unit 109 output control unit 111 Destination information acquisition unit 112, 112 ', 112 "reception environment determination unit 113, 113', 113" mode control unit 114 home information acquisition unit

Claims (4)

A first receiver for receiving a first standard broadcast; a second receiver for receiving a second standard broadcast delayed from the first standard broadcast; and the first standard received by the first receiver. A delay processing unit for synchronizing the output timing of the first standard broadcast data with the output timing of the second standard broadcast data received by the second receiving unit by performing a delay process on the broadcast data; A broadcast receiving apparatus comprising: an output control unit that selectively switches to either one standard broadcast or the second standard broadcast and outputs broadcast data;
A reception environment determination unit that determines whether the reception environment of the first standard broadcast is an environment that requires switching from the first standard broadcast to the second standard broadcast;
When the reception environment determining unit determines that the environment needs to be switched from the first standard broadcasting to the second standard broadcasting, the first mode for enabling the function of the delay processing unit is set. On the other hand, if the reception environment determination unit determines that the environment does not require switching from the first standard broadcast to the second standard broadcast, the second function of disabling the function of the delay processing unit is performed. A mode control unit for setting the mode ;
A destination information acquisition unit that acquires destination information from a navigation device that provides travel guidance;
A home information acquisition unit for acquiring home information from the navigation device,
The reception environment determination unit can receive the destination indicated by the destination information acquired by the destination information acquisition unit near the home indicated by the home information acquired by the home information acquisition unit. It is determined whether or not it is outside the coverage area of the first standard broadcast. If the destination is outside the coverage area, it is determined that the environment needs to be switched, and the purpose is A broadcast receiving apparatus, characterized in that if the ground is not outside the receivable area, it is determined that the environment does not require the switching . The reception environment determination unit is configured to receive reception sensitivity of the first standard broadcast having the same content as the second standard broadcast that is currently being received among the first standard broadcasts that can be received within the receivable area. Further determine whether or not is greater than or equal to a predetermined value,
When the reception environment determination unit determines that the reception sensitivity is equal to or higher than a predetermined value, the output control unit switches the selection from the second standard broadcast to the first standard broadcast and outputs broadcast data. The broadcast receiving apparatus according to claim 1 , wherein the mode control unit changes the setting from the first mode to the second mode.   The mode control unit enables the function of the output control unit in addition to the function of the delay processing unit in the first mode, and the output control unit in addition to the function of the delay processing unit in the second mode. The broadcast receiving apparatus according to claim 1, wherein the function is disabled. A first receiver for receiving a first standard broadcast; a second receiver for receiving a second standard broadcast delayed from the first standard broadcast; and the first standard received by the first receiver. A delay processing unit for synchronizing the output timing of the first standard broadcast data with the output timing of the second standard broadcast data received by the second receiving unit by performing a delay process on the broadcast data; An output control method by a broadcast receiving apparatus including an output control unit that selectively switches between broadcast of one standard or broadcast of the second standard and outputs broadcast data,
The reception environment determining unit of the broadcast receiving apparatus determines whether the reception environment of the first standard broadcast is an environment that requires switching from the first standard broadcast to the second standard broadcast. 1 step,
If the reception environment determination unit determines that the mode control unit of the broadcast receiving apparatus needs to switch from the first standard broadcast to the second standard broadcast, the delay processing unit When the reception mode determination unit determines that the environment is not required to switch from the first standard broadcast to the second standard broadcast while setting the first mode to enable the function, the delay A second step of setting a second mode for disabling the function of the processing unit ,
In the first step, the reception environment determination unit is configured such that the destination indicated by the destination information acquired from the navigation device to which the destination information acquisition unit of the broadcast reception device performs movement guidance is It is determined whether or not the information acquisition unit is outside the coverage area of the first standard broadcast that can be received near the home indicated by the home information acquired from the navigation device, and the destination can be received When it is outside the area, it is determined that the environment requires the switching, and when the destination is not outside the receivable area, it is determined that the environment does not require the switching. Output control method.

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