JP6021140B2 - In-vehicle receiver - Google Patents

Description

  The present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, such as terrestrial digital broadcast, and the reception section The present invention relates to a vehicle-mounted receiving device that reproduces information based on either the first broadcast signal or the second broadcast signal received by the mobile phone.

  In terrestrial digital broadcasting currently being performed, hierarchical transmission in which the modulation method of carrier waves and the strength of error correction can be changed for each segment in one channel is performed. By this hierarchical transmission, for example, among 13 segments (basic unit of frequency bandwidth) included in one channel, 12 segments are used and a high-quality broadcast signal such as a high-definition television signal and the remaining information are used. A broadcast signal including a broadcast signal modulated in a manner that is resistant to fluctuations in radio waves using one segment is provided for broadcasting. In hierarchical transmission, a high-quality broadcast signal with a high information rate that is broadcast using 12 segments is a weak-layer broadcast signal that is vulnerable to radio wave fluctuations. On the other hand, a broadcast signal modulated using a method resistant to fluctuations of the radio wave broadcast using one segment, that is, a broadcast signal in a strong hierarchy, has a low information rate and a low quality.

  In an in-vehicle receiver that receives a broadcast signal used for broadcasting by hierarchical transmission as described above, the reception quality of the broadcast signal varies in various ways while the vehicle is running. Information (broadcast program audio and video) is reproduced based on either the signal or the broadcast signal of the strong hierarchy (see Patent Document 1). In other words, when the reception quality is good, high-quality information (audio, high-definition video, etc.) is reproduced using the broadcast signal of the weak hierarchy (full segment reception), and when the reception quality is reduced, it is strong. Information (broadcast program audio, television video) is reproduced using the broadcast signal of the hierarchy (one-segment reception).

JP 2008-42229 A

By the way, various devices are mounted on the vehicle. There may be a case where reception quality (C / N) of the in-vehicle receiving device is temporarily lowered due to noise generated when the electrical component (device) is operated. In such a case, in the original radio wave state, although high-quality audio and video can be reproduced based on the broadcast signal in the weak hierarchy, low-quality audio and video based on the broadcast signal in the strong hierarchy are possible. Switching to video playback. In particular, after switching from a weak-layer broadcast signal to a strong-field broadcast signal, the reception quality exceeds a predetermined quality level so that mutual switching between a weak-layer broadcast signal and a strong-layer broadcast signal does not occur frequently. In an in-vehicle receiver that recovers from a broadcast signal of a strong layer to a broadcast signal of a weak layer when the recovered state is maintained for a certain period, the reception quality is reduced due to noise generated when the device operates. If it is instantaneously switched to a broadcast signal of a strong hierarchy, it is difficult (for a certain period) to recover to a broadcast signal of a weak hierarchy.

For this reason, in the in-vehicle receiving device, the antenna installation location is devised so that the noise generated by the device mounted on the vehicle is not received as much as possible. However, there is noise that cannot be avoided even if the antenna installation position is optimized. For this reason, when a specific device mounted on the vehicle is operated, even if the broadcast radio wave condition is good as described above, the broadcast signal is switched to a strong broadcast signal and the high broadcast signal based on the weak broadcast signal is Playback of quality information (audio, video) will be interrupted.

  The present invention has been made in view of such circumstances. When instantaneous noise is generated by the operation of a device mounted on a vehicle, the reproduction of information based on a broadcast signal of a weak hierarchy is maintained as much as possible. An in-vehicle receiving apparatus that can be used is provided.

The in-vehicle receiving apparatus according to the present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, in the reception unit, An in-vehicle receiving apparatus that reproduces information based on either the first broadcast signal or the second broadcast signal received in response to the reception quality of the broadcast signal at the receiving unit. A playback mode switching means for switching between a first playback mode using the first broadcast signal and a second playback mode using the second broadcast signal for information playback, and presence / absence of operation of a predetermined device mounted on the vehicle Device operation determining means, and even if the reception quality reaches a quality level to be switched from the first reproduction form to the second reproduction form by the reproduction form switching means, the device operation presence / absence determining means performs the predetermined operation. The operation of the device If it is determined that Tsu, a structure and a reproduction mode switching prohibiting control means for inhibiting the switching to the second reproduction mode from the first reproduction mode.

  With such a configuration, the reception quality should be switched from the first reproduction form using the first broadcast signal of the weak hierarchy to the reproduction of information to the second reproduction form using the second broadcast signal of the strong hierarchy to reproduce the information. However, if it is determined that the operation of the predetermined device has been performed, switching from the first reproduction mode to the second reproduction mode is prohibited. However, the reproduction of information using the first broadcast signal in the weak hierarchy can be maintained.

In the in-vehicle receiver according to the present invention, the playback mode switching means switches from the first playback mode to the second playback mode when the reception quality of the broadcast signal at the receiving unit is lowered to a predetermined quality level. When the state in which the reception quality exceeds the predetermined quality level is maintained for a certain period, the second playback mode can be restored to the first playback mode.

With such a configuration, information is reproduced based on the second broadcast signal in the strong hierarchy from the first reproduction form in which information is reproduced based on the first broadcast signal in the weak hierarchy when the reception quality is lowered to a predetermined quality level. Is switched to the second playback mode, and after that, when the reception quality is recovered and maintained for a period of time exceeding the predetermined quality level, the second playback mode is restored to the first playback mode. It is possible to prevent frequent switching between the first reproduction mode and the second reproduction mode. When it is determined that the operation of a predetermined device has been performed even when the reception quality reaches the quality level to be switched from the first reproduction form to the second reproduction form, the first reproduction form to the second reproduction form. Since switching to is prohibited, it is no longer necessary to return from the second reproduction mode to the first reproduction mode, which requires a certain period of time.

  The certain period during which the reception level, which is a condition for returning from the second playback mode to the first playback mode, is maintained above the predetermined level is an arbitrary time, even if it is a predetermined time period. It may be, as long as some time has passed.

The in-vehicle receiving apparatus according to the present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, in the reception unit, The in-vehicle receiving apparatus that reproduces information based on one of the first broadcast signal and the second broadcast signal received in this manner, and the reception quality of the broadcast signal at the receiving unit has decreased to a predetermined quality level Sometimes the first playback mode using the first broadcast signal for information playback is switched to the second playback mode using the second broadcast signal for information playback, and the reception quality exceeds the predetermined quality level. If maintained for a period,
A playback mode switching means for returning from the second playback mode to the first playback mode; a device operation presence / absence determining unit for determining the presence / absence of an operation of a predetermined device mounted on the vehicle; and the reception quality is the predetermined quality level. When the device operation presence / absence determining means determines that the operation of the predetermined device has occurred, the reception quality is changed to the predetermined reproduction after switching from the first reproduction mode to the second reproduction mode. The reproduction mode is configured to return from the second reproduction mode to the first reproduction mode when the reception quality exceeds the predetermined quality level without waiting for the state exceeding the quality level to be maintained for a certain period. And a control means for controlling the switching means.

With such a configuration, the reception quality is a predetermined quality to be switched from the first reproduction form using the weak first broadcast signal for information reproduction to the second reproduction form using the strong second broadcast signal for information reproduction. If the operation of a predetermined device occurs when the level is lowered, even if the first playback mode is switched to the second playback mode, the reception quality is maintained for a period of time that exceeds the predetermined quality level. Without waiting for this, if the reception quality recovers and exceeds the predetermined quality level, the return from the second playback mode to the first playback mode can be made immediately.

The in-vehicle receiving apparatus according to the present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, at the reception unit. An in-vehicle receiving apparatus that reproduces information based on one of the first broadcast signal and the second broadcast signal received at a receiver, wherein the reception quality of the broadcast signal at the receiver is up to a predetermined quality level Switching from the first reproduction form using the first broadcast signal for information reproduction to the second reproduction form using the second broadcast signal for information reproduction when the information is reduced, and switching from the first reproduction form to the second reproduction form. After the second playback mode is maintained regardless of the reception quality for a certain time from the switching timing of when the reception quality exceeds the predetermined quality level, the second playback mode is returned to the first playback mode. Regenerative form A switching unit, a determining device operation existence determination means whether the operation of the predetermined device mounted on the vehicle, when the reception quality is lowered to the predetermined quality level, said predetermined by the equipment operation existence determination means When it is determined that the device has been operated, after switching from the first reproduction mode to the second reproduction mode, the reception quality exceeds the predetermined quality level without waiting for the predetermined time. Control means for controlling the reproduction mode switching means so as to return from the second reproduction mode to the first reproduction mode.

With such a configuration, the reception quality is a predetermined quality to be switched from the first reproduction form using the weak first broadcast signal for information reproduction to the second reproduction form using the strong second broadcast signal for information reproduction. when dropped in level, when there is operation of the predetermined device, even it switched from the first reproduction mode to the second reproduction mode, a predetermined time after switching to the second reproduction mode from the first reproduction mode If the reception quality is recovered and exceeds the predetermined quality level without waiting for the first reproduction mode, the second reproduction mode can be immediately returned to the first reproduction mode.

  In the in-vehicle receiving device according to the present invention, the device operation presence / absence determining means may be configured to determine the presence / absence of the operation of the predetermined device based on a signal for controlling the operation of the predetermined device.

  With such a configuration, it is possible to easily determine the presence / absence of an operation for a predetermined device in a system for controlling the in-vehicle device.

  Further, in the in-vehicle receiver according to the present invention, the device operation presence / absence determination means determines whether or not the vehicle door lock actuator is operated, or determines whether or not the vehicle door mirror actuator is operated. It can be set as the structure to do.

The in-vehicle receiving apparatus according to the present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, at the reception unit. An in-vehicle receiving apparatus that reproduces information based on one of the first broadcast signal and the second broadcast signal received at a receiver, wherein the reception quality of the broadcast signal at the receiver is up to a predetermined quality level Switching from the first reproduction mode using the first broadcast signal for information reproduction to the second reproduction mode using the second broadcast signal for information reproduction when the reception quality is lower than the predetermined quality level A playback mode switching means for returning from the second playback mode to the first playback mode and a vehicle state determination unit for determining whether or not the vehicle is in a state in which a predetermined device can be operated. And the reception quality When the vehicle state determining means determines that the vehicle is in a state in which the predetermined device can be operated when the vehicle quality is lowered to the predetermined quality level, the first reproduction mode is switched to the second reproduction mode. Then, without waiting for the reception quality to exceed the predetermined quality level for a certain period, when the reception quality exceeds the predetermined quality level, the first reproduction is performed from the second reproduction form. a configuration in which a control means for controlling the playback mode switching means so as to return to the form.

With such a configuration, the reception quality is a predetermined quality to be switched from the first reproduction form using the weak first broadcast signal for information reproduction to the second reproduction form using the strong second broadcast signal for information reproduction. when lowered to the level, if a state in which the vehicle can operate the predetermined device, below the predetermined quality level reception quality is lowered, even replaced cut from the first reproduction mode to the second reproduction mode If the reception quality recovers and exceeds the predetermined quality level without waiting for the reception quality to exceed the predetermined quality level for a certain period, the first reproduction from the second reproduction form is performed. A return to form can be made immediately.

  The in-vehicle receiving apparatus according to the present invention receives a broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, at the reception unit. An in-vehicle receiving apparatus that reproduces information based on one of the first broadcast signal and the second broadcast signal received at a receiver, wherein the reception quality of the broadcast signal at the receiver is up to a predetermined quality level Switching from the first reproduction form using the first broadcast signal for information reproduction to the second reproduction form using the second broadcast signal for information reproduction when the information is reduced, and switching from the first reproduction form to the second reproduction form. After the second playback mode is maintained regardless of the reception quality for a certain time from the switching timing of when the reception quality exceeds the predetermined quality level, the second playback mode is returned to the first playback mode. Regenerative form Switching means, vehicle state determination means for determining whether or not the vehicle is in a state in which a predetermined device can be operated, and when the reception quality is reduced to the predetermined quality level, the vehicle state determination means Is determined to be in a state in which the predetermined device can be operated, the reception quality is changed to the predetermined quality without waiting for the predetermined time after switching from the first reproduction mode to the second reproduction mode. And a control unit that controls the reproduction mode switching unit so as to return from the second reproduction mode to the first reproduction mode when the level is exceeded.

With such a configuration, the reception quality is a predetermined quality to be switched from the first reproduction form using the weak first broadcast signal for information reproduction to the second reproduction form using the strong second broadcast signal for information reproduction. when lowered to the level, if a state in which the vehicle can operate the predetermined device, below the predetermined quality level reception quality is lowered, even replaced cut from the first reproduction mode to the second reproduction mode If the reception quality recovers and exceeds the predetermined quality level without waiting for a predetermined time after switching from the first playback mode to the second playback mode, the second playback mode is changed to the first playback mode. A return to can be made immediately.

  The vehicle state determination means determines whether the vehicle is in a state in which a door lock actuator can operate, or determines whether the vehicle is in a state in which a door mirror actuator can operate. It can be configured.

  According to the vehicle-mounted receiving apparatus according to the present invention, when a predetermined device mounted on the vehicle is operated, the reproduction of information using the first broadcast signal of the weak hierarchy is maintained even if the reception quality is lowered. Therefore, when an instantaneous reception quality deterioration due to an operation noise of a device mounted on a vehicle occurs, information reproduction based on a broadcast signal (first broadcast signal) in a weak hierarchy is maintained. Can do.

In addition, according to the in-vehicle receiving device according to the present invention, when there is an operation of a predetermined device mounted on the vehicle, the reception quality decreases and falls below the predetermined quality level, so that the second reproduction mode to the second reproduction mode. Even if the playback mode is switched , if the reception quality recovers and exceeds the predetermined quality level, the second playback mode can be immediately returned to the first playback mode. Although it is switched to the reproduction of information based on the broadcast signal of the higher hierarchy (second broadcast signal) due to the instantaneous deterioration of the reception quality due to the operation noise of the broadcast, the broadcast signal of the lower hierarchy (first broadcast signal) is immediately switched It returns to the reproduction of the information based on and is maintained.

  Moreover, according to the vehicle-mounted receiving apparatus according to the present invention, when the vehicle is in a state in which a predetermined device can be operated, even if the reception quality is lowered, the information is reproduced using the first broadcast signal of the weak hierarchy. Therefore, when a predetermined device actually operates and an instantaneous reception quality deterioration due to the operation noise occurs, information of the information based on the broadcast signal (first broadcast signal) of the weak hierarchy is generated. Regeneration can be maintained.

Furthermore, according to the vehicle-mounted receiving apparatus according to the present invention, when the vehicle is in a state in which a predetermined device can be operated, the reception quality is lowered to fall below the predetermined quality level, and the second reproduction mode to the second reproduction mode. Even if the playback mode is switched , if the reception quality recovers and exceeds the predetermined quality level, the second playback mode can be immediately returned to the first playback mode, so that the predetermined device is actually Although the operation is switched to the reproduction of information based on the broadcast signal of the higher hierarchy (second broadcast signal) due to the instantaneous deterioration of the reception quality due to the operation noise, the broadcast signal of the lower hierarchy (the first It returns to the reproduction of the information based on (one broadcast signal) and is maintained.

It is a block diagram which shows the structural example of the network constructed | assembled in the vehicle with which the vehicle-mounted receiving apparatus which concerns on one Embodiment of this invention is applied. It is a block diagram which shows the structural example of the terrestrial digital broadcast receiver which is a vehicle-mounted receiver which concerns on one Embodiment of this invention. 3 is a flowchart illustrating a first example of a procedure of automatic switching processing between full segment reception and one segment reception of a control unit in the terrestrial digital broadcast reception apparatus illustrated in FIG. 2. FIG. 4 is a diagram illustrating a relationship between a change in reception quality (C / N) and switching between full segment reception and one segment reception when automatic switching between full segment reception and one segment reception is performed according to the procedure illustrated in FIG. 3. In the case where automatic switching between full segment reception and one segment reception is performed according to the procedure shown in FIG. 3, the change in reception quality (C / N) when the door lock actuator is operated, and switching between full segment reception and one segment reception It is a figure which shows the relationship (the 1). 6 is a flowchart illustrating a second example of a procedure of automatic switching processing between full segment reception and one segment reception of a control unit in the terrestrial digital broadcast reception apparatus illustrated in FIG. 2. Changes in reception quality (C / N) when the door lock actuator is operated and switching between full segment reception and one segment reception when automatic switching between full segment reception and one segment reception is performed according to the procedure shown in FIG. It is a figure which shows the relationship. 10 is a flowchart illustrating a third example of a procedure of automatic switching processing between full segment reception and one segment reception by the control unit in the terrestrial digital broadcast reception apparatus illustrated in FIG. 2. 7 is a flowchart illustrating a fourth example of a procedure of automatic switching processing between full segment reception and one segment reception of a control unit in the terrestrial digital broadcast reception device illustrated in FIG. 2. It is a figure which shows the other relationship of the change of reception quality (C / N), and the switching of full segment reception and one segment reception. FIG. 10 is a flowchart illustrating a fifth example of a procedure of automatic switching processing between full segment reception and one segment reception by the control unit in the terrestrial digital broadcast reception apparatus illustrated in FIG. 2. FIG. 12 is a diagram illustrating a relationship between a change in reception quality (C / N) and switching between full segment reception and one segment reception when automatic switching between full segment reception and one segment reception is performed according to the procedure illustrated in FIG. 11. It is a flowchart which shows the 6th example of the procedure of the automatic switching process of the full seg reception of the control part in the terrestrial digital broadcast receiver shown in FIG. 2, and a 1 seg reception.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  An in-vehicle receiving apparatus according to an embodiment of the present invention is, for example, a terrestrial digital broadcast receiving apparatus, and is connected to a network (CAN: Controller Area Network) built in a vehicle as shown in FIG. The In FIG. 1, an operation unit 11 and an ECU (control unit) 10 of an instrument panel in a vehicle interior are connected to the in-vehicle CAN, and a control unit of various electrical components (devices), specifically, a power window actuator 12, door lock actuator 13, door mirror actuator 14, light 15, air conditioner 16, air bag actuator 17, wiper actuator 18, power steering actuator 19, navigation device 20, audio device 21, engine 22, gear actuator Each control unit 23 and a terrestrial digital broadcast receiving device (hereinafter referred to as an in-vehicle receiving device) 30 are connected to the in-vehicle network CAN. In such a system, a control signal (communication information) for controlling the operation of each device is supplied from the ECU 10 to the corresponding control unit via the in-vehicle network CAN, and control by the control unit based on the control signal is performed. Corresponding devices (electrical components), for example, the door lock actuator 13 and the door mirror actuator 14 operate.

  The in-vehicle receiver 30 (terrestrial digital broadcast receiver) can receive digital terrestrial broadcasts. In this terrestrial digital broadcasting, as described above, the information rate using 12 segments out of 13 segments included in one channel is large (for example, by multi-level QAM) due to hierarchical transmission. A broadcast signal (hereinafter referred to as a full-segment broadcast signal (first broadcast signal)) and a strong hierarchical broadcast signal (hereinafter referred to as QPSK) modulated in a manner that is resistant to fluctuations in radio waves using the remaining one segment (hereinafter referred to as QPSK). A broadcast signal including a one-segment broadcast signal (referred to as a second broadcast signal) is provided for broadcasting. This broadcast signal is transmitted as an OFDM signal in which a plurality of carriers modulated based on information to be broadcast (audio, video, data, etc.) are converted into OFDM (Orthogonal Frequency Division Multiplexing).

  The in-vehicle receiving device 30 that receives the broadcast signal (OFDM signal) transmitted hierarchically is configured, for example, as shown in FIG.

  In FIG. 2, this in-vehicle receiver 30 includes a control unit 31, four tuner units 32a, 32b, 32c, 32d (reception unit), a switching unit 33, a first OFDM demodulation unit 34a, and a second OFDM demodulation unit. 34b, a decoder 35, a display processing unit 36, and a digital / analog converter (D / A converter) 37. The control unit 31 includes a reception state determination unit 311, a switching control unit 312, a search control unit 313, and an EPG creation unit 314. The in-vehicle receiving device 30 is connected to a center unit 40 provided on the instrument panel. The center unit 40 includes a display device 41 and an operation unit 42, and a speaker 45 is connected to the center unit 40.

  Each of the four tuner units 32a to 32d selects a transmission channel and receives a broadcast signal (OFDM signal) of the selected transmission channel. This broadcast signal includes the above-described weak-layer full-segment broadcast signal and strong-layer one-segment broadcast signal. Under the control of the switching control unit 312 in the control unit 31, the switching unit 33 maintains a state in which broadcast signals from the two tuner units 32a and 32b are constantly supplied to the first OFDM demodulating unit 34a. The broadcast signals from the two tuner units 32c and 32d are switched to either the first OFDM demodulator 34a or the second OFDM demodulator 34b.

  Each of the first OFDM demodulator 34a and the second OFDM demodulator 34b demodulates a broadcast signal (OFDM signal) input via the switching unit 33 to generate a digital reception signal (transport packet). The control unit 31 performs diversity combining of a plurality (four or two) of digital reception signals from the first OFDM demodulation unit 34a according to a predetermined algorithm, and an audio signal and video signal are obtained from the combined reception signal obtained thereby. And other signals (data, EPG information, etc.). And the control part 31 supplies an audio | voice signal and a video signal to the decoder 35, and processes other signals, such as data and EPG information, internally. The decoder 35 decodes the audio signal and the video signal from the control unit 31. The decoded video signal obtained by the decoding by the decoder 35 is subjected to a predetermined display process by the display processing unit 36 and is supplied to the center unit 40. The decoded audio signal obtained by decoding by the decoder 3 is converted into an analog audio signal by the D / A converter 37 and supplied to the center unit 40.

  In the center unit 40, the video of the broadcast program is displayed on the display device 41 based on the decoded video signal from the display processing unit 36, and the audio of the broadcast program is output from the speaker 45 based on the decoded audio signal.

  The reception state determination unit 311 in the control unit 31 is based on the combined reception signal obtained by diversity combining, and the reception quality of the broadcast signal (OFDM signal), for example, the ratio between the carrier power (C) and the noise power (N) C / N is calculated as a parameter representing reception quality, and reception quality is determined based on this CN. The search processing unit 313 in the control unit 31 is a composite reception signal obtained by diversity combining the digital reception signal from the second OFDM demodulation unit 34b that demodulates the broadcast signals (OFDM signals) from the two tuner units 32c and 32d. The process for searching for a receivable channel is performed based on the above. The EPG creation unit 314 separates the EPG separated from the combined reception signal obtained by diversity combining the digital reception signal from the second OFDM demodulation unit 34b that demodulates the broadcast signals (OFDM signals) from the two tuner units 32c and 32d. A process for creating an EPG (electronic program guide) is performed based on the information. The processing by the search processing unit 313 and the processing by the EPG creation unit 314 are performed at a predetermined timing in the background of processing related to reproduction (output) of information (audio, video) based on a received broadcast signal, for example. Is called.

The control unit 31 uses a full-segment playback mode (first playback mode) that uses a full-seg broadcast signal of a weak hierarchy for playback of information, and a one-segment playback mode (second playback mode) that uses a one-segment broadcast signal of a strong hierarchy for playback of information. Are switched according to the reception quality determined by the reception state determination unit 311 (reproduction form switching means). For example, in the full segment playback mode, the control unit 31 supplies a portion corresponding to the full segment broadcast signal to the decoder 35 in the combined reception signal obtained by diversity combining, and in the one segment playback mode, the control unit 31 receives the combined reception signal obtained by diversity combining. A portion corresponding to the one-segment broadcasting signal is supplied to the decoder 35. Further, the control unit 31 acquires a signal for controlling the operation of an electrical component (device), for example, the door lock actuator 13 (see FIG. 1), from the in-vehicle network CAN, and performs the full segment reproduction based on the control signal. Further switching of the mode and the one-segment playback mode is further controlled. The control unit 31 switches between the full segment reproduction mode and the one segment reproduction mode, for example, according to the procedure shown in FIG.

  In FIG. 3, the reception state determination unit 311 determines whether or not the reception quality represented by C / N is equal to or lower than a predetermined quality level (threshold value) Thone-seg (S11). If the reception state determination unit 311 determines that the reception quality is not equal to or lower than the predetermined quality level Thone-seg (NO in S11), the control unit 31 maintains the full segment reproduction form (S12). As a result, in a reception environment in which the reception quality (C / N) exceeds a predetermined quality level Thone-seg, the full segment reproduction mode is maintained, and high-quality video and audio reproduction based on the weak segment full segment broadcast signal is performed. (Video display on the display device 41, sound output from the speaker 45) is performed.

  The vehicle travels and the reception environment of the broadcast signal deteriorates. For example, at time t1 in FIG. 4, the reception state determination unit 311 determines that the reception quality (C / N) is equal to or lower than the predetermined quality level Thone-seg. Then (YES in S11), the control unit 31 further transmits the in-vehicle network CAN (see FIG. 1) whether or not the operation of the door lock actuator 13 which is an in-vehicle electrical component (device) has been operated (ON). Is determined based on the presence or absence of a signal for controlling the operation of the door lock actuator 13 (S13: device operation determination means). When it is determined that there is no operation of the door lock actuator 13 (NO in S13), that is, when it is determined that the deterioration of the reception environment is not the operation noise of the door lock actuator 13, the control unit 31 The full segment playback mode is switched to the one segment playback mode (S14: playback mode switching means). As a result, when the reception environment of the broadcast signal is bad and the reception quality (C / N) is lowered to a predetermined quality level Thone-seg, the one-segment playback mode is switched to using a strong one-segment broadcast signal that is resistant to noise and the like. Information (audio, video) is reproduced (video display, sound output).

  Thereafter, the control unit 31 determines whether or not the reception quality (C / N) is equal to or lower than a predetermined quality level Thone-seg (S15). If the reception quality (C / N) is below the predetermined quality level Tone-seg without being recovered (YES in S15), the control unit 31 confirms that a timer T described later is zero (S16). YES), the one-segment playback mode is maintained (S17). In this way (S15 to S17), in the state where the reception quality is equal to or lower than the predetermined quality level “Thone-seg”, the one-segment playback mode is maintained.

  When the one-seg playback mode is maintained and the reception environment of the broadcast signal is improved by traveling of the vehicle and the reception quality (C / N) exceeds the predetermined quality level Thone-seg (NO in S15), The control unit 31 determines whether or not the timer T is zero (T = 0) (S18). If the timer T is zero (YES in S18), the timer T is started (S19). It is determined whether or not the timer T has reached a predetermined time To (S20). When the timer T has not reached the predetermined time To (NO in S20), the control unit 31 maintains the one-segment playback mode (S17). Thereafter, even if the reception quality (C / N) exceeds the predetermined quality level Thone-seg and the reception environment is good (NO in S15), the one-segment playback mode is maintained while the timer T operates (S15). , S18, S20, S17).

  In a situation where the broadcast signal reception environment is unstable, the reception quality (C / N) may temporarily drop below the predetermined quality level Thone-seg. In this case (YES in S15), the control unit 31 confirms that the timer T is not zero (NO in S16), resets the timer T (S21), and further maintains the one-segment playback mode (S17). Thereafter, when the reception quality (C / N) exceeds the predetermined quality level Thone-seg again due to the recovery of the broadcast signal reception environment, the control unit 31 confirms that the timer T is zero. (YES in S18), the timer T is started again (S19). Then, the control unit 31 determines whether or not the timer T has reached the predetermined time To (S20). If the timer T has not reached the predetermined time To (NO in S20), the reception quality (C / N) Is over the predetermined quality level Thone-seg, but the one-segment playback mode is maintained (S17).

  For example, the broadcast signal reception environment in which the reception quality (C / N) exceeds the predetermined quality level Thone-seg cannot be maintained for the predetermined time To as in the situation between the time t1 and the time t2 in FIG. In an unstable situation, the one-segment playback mode is maintained while the start of the timer T (NO in S15, S18, S19, S20) and the reset (YES in S15, S16, S21) are repeated (S17). . Accordingly, in such a situation where the reception environment of the broadcast signal is unstable, information (audio, video) is reproduced (video display, sound output) using a one-segment broadcast signal of a strong hierarchy resistant to noise or the like.

  In the situation where the one-segment playback mode is maintained as described above (S17), the reception environment of the broadcast signal is improved and the reception quality (C / N) exceeds the predetermined quality level Thone-seg (in S15). NO), when the timer T reaches the predetermined time To (YES in S20), that is, the reception quality (C / N) is equal to the predetermined quality level Thone as in the situation between the time t2 and the time t3 in FIG. When the state exceeding -seg continues for a predetermined time To, the control unit 31 returns to the full segment reproduction mode (time t3 in FIG. 4). This makes it possible to reproduce high-quality video and audio based on weak-segment full-segment broadcast signals from information (audio and video) reproduction (video display, sound output) using strong-segment one-segment broadcast signals that are resistant to noise, etc. (Video display, sound output).

  Here, in a situation where the reception environment of the broadcast signal is good, the reception quality (C / N) exceeds the predetermined quality level Thone-seg, and the full segment reproduction mode is maintained (NO in S11, S12), the control is performed. Even if the reception quality (C / N) becomes the predetermined quality level Thone-seg to be switched to the one-segment playback mode (YES in S11), the unit 31 transmits the in-vehicle network CAN (FIG. 1). If it is determined that there is an operation of the door lock actuator 13 (YES in S13), the control unit 31 is prohibited from switching to the one-segment reproduction mode (switching to the one-segment reproduction mode is prohibited). ), Maintaining the full segment reproduction mode (S12: reproduction mode switching prohibition control means). Thus, for example, as shown in FIG. 5, in a situation where the reception quality (C / N) exceeds a predetermined quality level Thone-seg, the reception quality is instantaneously received at time t1 due to the operation noise of the door lock actuator 13. Even if (C / N) falls below the predetermined quality level Thone-seg, the full segment reproduction mode is maintained. In this case, noise (such as block noise in the video) is instantaneously generated in the high-quality video and audio reproduced based on the full-segment broadcasting signal of the weak hierarchy, but the original high-quality video and audio are immediately Return to state.

  As described above, according to the in-vehicle receiver 30 that is switched between the full-segment reproduction mode and the one-segment reproduction mode according to the procedure shown in FIG. 3, when the door lock actuator 13 is operated, the reception quality (C / N ) Is reduced, information (video, audio) playback (full-seg playback mode) using weak-segment full-segment broadcast signals is maintained, so that instantaneous reception due to operation noise of the door lock actuator 13 is maintained. When quality degradation occurs, it is possible to maintain the reproduction of information based on the full-segment broadcasting signal of the weak hierarchy. In addition, the reception quality (C / N) is instantaneously reduced due to the operation noise of the door lock actuator 13, and after switching to the one-segment playback mode, the reception quality (C / N) is restored and the predetermined quality is restored. Even if the level Thone-seg is exceeded, it is possible to prevent the one-seg playback mode from being maintained and waiting for a predetermined time To before switching to the full-seg playback mode.

  The control unit 31 can switch between the full-segment playback mode and the one-segment playback mode according to the procedure shown in FIG. 6 instead of the procedure shown in FIG. In FIG. 6, the same processing steps as those shown in FIG. 3 are denoted by the same reference numerals.

  In this case (see FIG. 6), in a situation where information (video, audio) reproduction (full-segment reproduction form) using a full-segment broadcasting signal of a weak hierarchy is maintained (NO in S11, S12), reception quality (C / N ) Decreases below the predetermined quality level Thone-seg (YES in S11), if it is determined that the door lock actuator 13 has been operated (YES in S13), the control unit 31 turns on the door lock flag ( S31), switching to information (video, audio) reproduction (one-segment reproduction form) using the strong-segment one-segment broadcasting signal (S14). Thereafter, when the control unit 31 determines that the reception quality (C / N) exceeds the predetermined quality level Thone-seg (NO in S15), the control unit 31 determines whether the door lock flag is on (S32). ). If the door lock flag is on (YES in S32), the control unit 31 turns off the door lock flag (S33) and returns the one-segment reproduction mode to the full-segment reproduction mode (S22). Thereafter, the full segment reproduction mode is maintained (NO in S11, S12).

As described above, according to the in-vehicle receiver 30 that is switched between the full-segment reproduction mode and the one-segment reproduction mode according to the procedure shown in FIG. 6, when the door lock actuator 13 is operated, for example, as shown in FIG. As described above, even when the reception quality (C / N) is reduced and falls below the predetermined quality level Thone-seg and the full-segment playback mode is switched to the one-segment playback mode, the reception quality (C / N) is recovered and the If the predetermined quality level Thone-seg is exceeded, the return from the one-seg reproduction mode to the full-seg reproduction mode can be performed immediately, so that the instantaneous reception quality (C / N) decreases due to the operation noise of the door lock actuator 13. Will switch to the one-segment playback mode, but will immediately return to the full-segment playback mode and maintain it. In addition, the reception quality (C / N) is instantaneously reduced due to the operation noise of the door lock actuator 13, and after switching to the one-segment playback mode, the reception quality (C / N) is restored and the predetermined quality is restored. Even if the level Thone-seg is exceeded, it is possible to prevent the one-seg playback mode from being maintained and waiting for a predetermined time To before switching to the full-seg playback mode.

  On the assumption that the vehicle is in a state where the vehicle can operate the door lock actuator 13 and the door mirror actuator 14 in place of the procedure shown in FIG. According to the procedure shown in FIG. 8, the full segment reproduction mode and the one segment reproduction mode can be switched. In FIG. 8, the same processing steps as those shown in FIG. 3 are denoted by the same reference numerals.

  In this case (see FIG. 8), in a situation where information (video, audio) reproduction (full-segment reproduction form) using a full-segment broadcast signal in a weak hierarchy is maintained (NO in S11, S12), reception quality (C / N ) Decreases below the predetermined quality level Thone-seg (YES in S11), the control unit 31 determines whether or not the vehicle is stopped (S34). If the vehicle is not stopped (NO in S34), the control unit 31 switches from the full segment playback mode to the one segment playback mode (S14), and according to the reception quality (C / N) status (S15), Processing for maintaining the playback mode and returning to the full segment playback mode (S16 to S22) is performed. On the other hand, if the control unit 31 determines that the vehicle is stopped (YES in S34), the control unit 31 determines that the vehicle is in a state in which the door lock / actuator 13 or the door mirror / actuator 14 can be operated, and switches to the one-segment playback mode. (S12: reproduction mode switching prohibition control means) without any change (prohibition of switching to the one-segment reproduction mode).

  As described above, according to the vehicle-mounted receiving device 30 that is switched between the full-segment reproduction mode and the one-segment reproduction mode according to the procedure shown in FIG. 8, the vehicle stops and the vehicle is stopped by the door lock actuator 13 or the door mirror actuator. 14 is in a state where it can be operated, even if the reception quality deteriorates, the full segment reproduction mode can be maintained, so that the door lock actuator 13 and the door mirror actuator 14 are actually operated and are caused by the operation noise. When an instantaneous deterioration in reception quality occurs, the full segment reproduction form can be maintained (see FIG. 5). Even if the door lock actuator 13 and the door mirror actuator 14 do not operate when the vehicle is stopped, if the reception quality (C / N) exceeds the predetermined quality level Thone-seg, The full segment reproduction mode is maintained as it is.

  The control unit 31 can switch between the full segment reproduction mode and the one segment reproduction mode according to the procedure shown in FIG. 9 instead of the procedure shown in FIG. In FIG. 9, the same processing steps as those shown in FIG. 8 are denoted by the same reference numerals.

  In this case (see FIG. 9), in a situation where information (video, audio) reproduction (full segment reproduction form) using a full-segment broadcast signal in a weak hierarchy is maintained (NO in S11, S12), reception quality (C / N ) Decreases below the predetermined quality level Thone-seg (YES in S11), if it is determined that the vehicle is stopped (YES in S34), the control unit 31 turns on the stopping flag (S35), Switching to information (video, audio) reproduction (one-segment reproduction form) using the one-segment broadcasting signal of the strong hierarchy (S14). Thereafter, when the control unit 31 determines that the reception quality (C / N) exceeds the predetermined quality level Thone-seg (NO in S15), the control unit 31 determines whether or not the stopping flag is on (S36). . If the stop flag is on (YES in S36), the control unit 31 turns off the stop flag (S37) and returns the full-segment playback mode from the one-segment playback mode (S22). Thereafter, the full segment reproduction mode is maintained (NO in S11, S12).

As described above, according to the vehicle-mounted receiving device 30 that is switched between the full-segment playback mode and the one-segment playback mode according to the procedure shown in FIG. 9, the vehicle is stopped and the vehicle can operate in a predetermined device. In some cases, even if the reception quality (C / N) decreases and falls below the predetermined quality level Thone-seg, and the full-segment playback mode is switched to the one-segment playback mode, the reception quality is recovered and the predetermined quality level Thone If -seg is exceeded, the return from the one-segment playback mode to the full-segment playback mode can be made immediately, so that the door lock actuator 13 and the door mirror actuator 14 are actually operated and instantaneously caused by the operation noise. Although switching to the reproduction of information based on the broadcast signal (one-segment broadcasting signal) of the strong hierarchy due to a significant decrease in reception quality, And returns to the reproduction of information based on a weak hierarchy of the broadcasting signal (full-segment transmission signal) to the seat so that it is maintained (see FIG. 7).

  In each of the above-described examples (see FIGS. 3 and 6), when the door lock actuator 13 is operated, the full segment reproduction mode is maintained (see FIG. 3), and immediately even when the one segment reproduction mode is switched. It was intended to return to the full-segment playback mode (see FIG. 6), but is not limited to this, and other electrical components (devices) that may affect the reception environment of broadcast signals due to the operating noise of the door mirror / actuator 14 etc. Switching control between the full segment reproduction mode and the one segment reproduction mode can be performed according to the presence or absence of the operation. Further, not only one device (one type) but also a plurality of devices (a plurality of types) can be targeted.

  In each of the above-described examples (see FIGS. 8 and 9), the state in which the vehicle is stopped is a state in which the vehicle can operate devices (electrical components) such as the door lock actuator 13 and the door mirror actuator 14. Not limited to this, for example, a state in which the vehicle can operate devices (electrical components) such as the door lock actuator 13 and the door mirror actuator 14 from a state where the vehicle is stopped to a start state at a predetermined low speed. It can be.

  In each of the above-described examples, as shown in FIG. 4, when the state where the reception quality (C / N) exceeds the predetermined quality level Thone-seg is maintained for a predetermined time To, the one-segment playback mode is changed to the full-seg playback mode. Although it was a thing to return, it is not limited to this. For example, as shown in FIG. 10, when the reception quality (C / N) is equal to or lower than the first quality level Thone-seg (time t1), the full-segment playback mode is switched to the one-segment playback mode, and the reception quality (C / N When N) exceeds a second quality level Thfull-seg higher than the first quality level Thone-seg (time t3), the one-segment playback mode may be switched to the full-seg playback mode. Also in this case, when the reception quality (C / N) exceeds the first quality level Tone-seg which is a reference for switching from the full segment reproduction mode to the one segment reproduction mode (time t2), the full segment reproduction mode is not immediately restored. If the reception quality (C / N) exceeds the first quality level Thone-seg for a period Tx, the one-segment playback mode is switched to the full-seg playback mode. The period Tx may vary depending on the broadcast signal reception environment.

  Furthermore, the switching between the full segment reproduction mode and the one segment reproduction mode in the control unit 31 in the in-vehicle receiver 30 can be performed, for example, according to the procedure shown in FIG.

  In this example, as in the above-described example (see FIG. 6), the full segment reproduction mode is maintained in a state where the reception quality (C / N) of the broadcast signal exceeds the predetermined quality level Thone-seg (in S11). NO, S12). Then, for example, when the reception quality becomes equal to or lower than the predetermined quality level Thone-seg at time t1 in FIG. 12 (YES in S11), it is determined whether or not the door lock actuator 13 has been operated (S13). . Here, when the door lock actuator 13 is not operating (NO in S13), the reproduction of information is switched from the full-segment reproduction mode to the one-segment reproduction mode, assuming that the broadcast signal reception environment is deteriorated (S14). Then, the control unit 31 confirms that a door lock flag, which will be described later, is not turned on (turned off) (NO in S32), starts a timer T (S41), and the timer T is set for a predetermined time. It is determined whether Ta has been reached (S42). Until the timer T reaches the time Ta, the one-segment broadcasting is performed regardless of the reception quality (C / N) of the broadcast signal, that is, regardless of whether information can be reproduced in the full-segment reproduction form. The reproduction form is maintained.

  In the situation where the one-segment playback mode is maintained, for example, when the timer T reaches a certain time Ta at time t2 in FIG. 12 (YES in S42), the control unit 31 again transmits the broadcast signal to be received. It is determined whether or not the reception quality (C / N) exceeds a predetermined quality level Thone-sge (S43). For example, when the reception quality (C / N) of the broadcast signal exceeds a predetermined quality level Thone-seg at time t3 in FIG. 12 (YES in S43), the control unit 31 resets the timer T. (S44), the reproduction of the information in the one-segment reproduction form is restored to the reproduction of the full-segment information (S22). Thereafter, as long as the reception quality (C / N) of the broadcast signal exceeding the predetermined quality level Thone-seg is maintained, information (video, audio) is continuously reproduced in the full segment reproduction form. Each time the reception quality (C / N) of the broadcast signal falls below the predetermined quality level “Thone-seg”, the process is switched to the one-segment playback mode and the above-described processing (S14, S32, S41 to S45) is executed. .

  On the other hand, in a situation where the full segment playback mode is maintained (NO in S11, S12), the door lock actuator 13 operates when the reception quality of the broadcast signal falls below the predetermined quality level Thone-seg (YES in S11). If it is (YES in S13), the control unit 31 turns on the door lock flag (S31) and switches from the full segment reproduction mode to the one segment reproduction mode (S14). After that, the control unit 31 confirms that the door lock flag is turned on (YES in S32), turns off the door lock flag (S33), and then switches from the one-segment playback mode to the full-seg playback mode. Return (S22). Thereafter, the full segment reproduction mode is maintained (NO in S11, S12).

As described above, according to the in-vehicle receiving device 30 that is switched between the full-segment reproduction mode and the one-segment reproduction mode according to the procedure shown in FIG. 11, when the door lock actuator 13 is operated, the above-described example (FIG. 6). As shown in FIG. 7, for example, as shown in FIG. 7, even if the reception quality (C / N) decreases and falls below a predetermined quality level Thone-seg, the full segment playback mode is switched to the one segment playback mode. If the reception quality (C / N) recovers and exceeds the predetermined quality level Thone-seg without waiting for a certain time Ta (see FIG. 12) after switching from the full-seg playback mode to the one-seg playback mode, Since the return from the playback mode to the full segment playback mode can be made immediately, the instantaneous reception quality caused by the operation noise of the door lock actuator 13 Although it may switch to the one-segment reproduction form by reduction in C / N), so immediately and returns to full-segment reproduction mode it is maintained.

  Furthermore, the control unit 31 can switch between the full segment reproduction mode and the one segment reproduction mode according to the procedure illustrated in the procedure illustrated in FIG. 13 instead of the procedure illustrated in FIG. 11. In FIG. 13, the same processing steps as those shown in FIG. 11 are denoted by the same reference numerals.

  In this case (see FIG. 13), normally, when the reception quality (C / N) of the broadcast signal is lowered to a predetermined quality level Thone-seg, the full-segment playback mode is switched to the one-segment playback mode (S14). After maintaining the one seg reproduction form regardless of the reception quality for a certain time Ta, when the reception quality exceeds the predetermined quality level Thone-seg, the one seg reproduction form is restored to the full seg reproduction form (S41 to S44, S22). FIG. 12). On the other hand, in a situation where the full segment reproduction mode is maintained (NO in S11, S12), when the reception quality (C / N) falls below a predetermined quality level Thone-seg (YES in S11), the vehicle is stopped. If it is determined that there is (YES in S34), the control unit 31 turns on the stopping flag (S35) and switches to the one-segment playback mode (S14), as in the example shown in FIG. Thereafter, the control unit 31 confirms that the stopping flag is turned on (YES in S36), and after turning off the stopping flag (S37), returns the one-segment playback mode to the full-seg playback mode. (S22). Thereafter, the full segment reproduction mode is maintained (NO in S11, S12).

As described above, according to the in-vehicle receiver 30 that is switched between the full segment reproduction mode and the one segment reproduction mode according to the procedure shown in FIG. 13, the vehicle stops and the door lock actuator 13 and the door mirror actuator 14 are operated. When you are ready to
Similar to the above-described example (see FIG. 9), even if the reception quality (C / N) is reduced and falls below a predetermined quality level Thone-seg, and the full-seg playback mode is switched to the one-seg playback mode, the full-seg playback mode If the reception quality (C / N) is recovered and exceeds the predetermined quality level Thone-seg without waiting for a certain time Ta (see FIG. 13) after switching to the one-seg playback mode, the one-seg playback mode is started. Since the full-segment playback mode can be immediately restored, the door lock actuator 13 and the door mirror actuator 14 are actually operated, and the mode is switched to the one-segment playback mode due to an instantaneous deterioration in reception quality due to the operation noise. However, the full-segment playback mode is immediately restored and maintained (see FIG. 7).

  The in-vehicle receiver of the present invention has an effect that it can maintain the reproduction of information based on the broadcast signal of the weakest layer as much as possible when instantaneous noise is generated by the operation of the device mounted on the vehicle. And receiving a broadcast signal including the first broadcast signal of the weak hierarchy and the second broadcast signal of the strong hierarchy, which is digitally broadcast by hierarchical transmission as in terrestrial digital broadcasting, It is useful as a vehicle-mounted receiving device that reproduces information based on either the received first broadcast signal or the second broadcast signal.

30 On-vehicle receiver (digital terrestrial broadcast receiver)
31 control unit 32a, 32b, 32c, 32d tuner unit 33 switching unit 34a first OFDM demodulation unit 34b second OFDM demodulation unit 35 decoder 36 display processing unit 37 digital / analog converter (D / A converter)
40 Center unit 41 Display device 42 Operation unit

Claims (11)

A broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, is received by a reception unit, and the first broadcast signal received by the reception unit and An in-vehicle receiver that reproduces information based on one of the second broadcast signals,
Switching between a first reproduction form using the first broadcast signal for information reproduction and a second reproduction form using the second broadcast signal for information reproduction according to the reception quality of the broadcast signal at the receiving unit. Reproduction mode switching means;
Device operation presence / absence determining means for determining presence / absence of operation of a predetermined device mounted on the vehicle;
Even if the reception quality reaches a quality level to be switched from the first playback mode to the second playback mode by the playback mode switching unit, the device operation presence / absence determining unit determines that the operation of the predetermined device has occurred. Then, the vehicle-mounted receiving apparatus which has the reproduction | regeneration form switching prohibition control means which prohibits the switching from the said 1st reproduction | regeneration form to the said 2nd reproduction | regeneration form.   The reproduction mode switching means switches from the first reproduction mode to the second reproduction mode when the reception quality of the broadcast signal at the receiving unit is lowered to a predetermined quality level, and the reception quality changes to the predetermined quality level. The in-vehicle receiving device according to claim 1, wherein when the state of exceeding is maintained for a certain period, the second playback mode is returned to the first playback mode. A broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, is received by a reception unit, and the first broadcast signal received by the reception unit and An in-vehicle receiver that reproduces information based on one of the second broadcast signals,
Second playback using the second broadcast signal for information playback from the first playback mode using the first broadcast signal for playback of information when the reception quality of the broadcast signal at the receiver is reduced to a predetermined quality level A playback mode switching means for switching from the second playback mode to the first playback mode when the mode is maintained and the reception quality exceeds the predetermined quality level for a certain period of time.
Device operation presence / absence determining means for determining presence / absence of operation of a predetermined device mounted on the vehicle;
When the reception quality is reduced to the predetermined quality level, if the device operation presence / absence determination unit determines that the operation of the predetermined device has been performed, the first reproduction mode is switched to the second reproduction mode. Subsequently, when the reception quality exceeds the predetermined quality level without waiting for the state in which the reception quality exceeds the predetermined quality level to be maintained for a certain period, the second reproduction form to the first reproduction form. A vehicle-mounted receiving device comprising control means for controlling the reproduction mode switching means so as to return to the normal state. A broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, is received by a reception unit, and the first broadcast signal received by the reception unit and An in-vehicle receiver that reproduces information based on one of the second broadcast signals,
Second playback using the second broadcast signal for information playback from the first playback mode using the first broadcast signal for playback of information when the reception quality of the broadcast signal at the receiver is reduced to a predetermined quality level After switching from the first playback mode to the second playback mode for a certain time from the timing of switching from the first playback mode to the second playback mode, the reception quality exceeds the predetermined quality level after maintaining the second playback mode regardless of the reception quality. A playback mode switching means for returning from the second playback mode to the first playback mode;
Device operation presence / absence determining means for determining presence / absence of operation of a predetermined device mounted on the vehicle;
When the reception quality is reduced to the predetermined quality level, if the device operation presence / absence determination unit determines that the operation of the predetermined device has been performed, the first reproduction mode is switched to the second reproduction mode. And a control means for controlling the reproduction form switching means so as to return from the second reproduction form to the first reproduction form when the reception quality exceeds the predetermined quality level without waiting for the predetermined time. A vehicle-mounted receiving device.   The in-vehicle receiving device according to any one of claims 1 to 4, wherein the device operation presence / absence determination unit determines whether or not the predetermined device operates based on a signal for controlling the operation of the predetermined device.   The on-vehicle receiving device according to claim 1, wherein the device operation presence / absence determination unit determines whether or not an operation of an actuator of a door lock of the vehicle is performed.   The vehicle-mounted receiving device according to any one of claims 1 to 6, wherein the device operation presence / absence determining means determines whether or not an actuator of a door mirror of the vehicle is operating. A broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, is received by a reception unit, and the first broadcast signal received by the reception unit and An in-vehicle receiver that reproduces information based on one of the second broadcast signals,
Second playback using the second broadcast signal for information playback from the first playback mode using the first broadcast signal for playback of information when the reception quality of the broadcast signal at the receiver is reduced to a predetermined quality level A playback mode switching means for switching from the second playback mode to the first playback mode when the mode is maintained and the reception quality exceeds the predetermined quality level for a certain period of time.
Vehicle state determination means for determining whether or not the vehicle is in a state in which a predetermined device can be operated;
When the reception quality is reduced to the predetermined quality level, if the vehicle state determination means determines that the vehicle is in a state in which the predetermined device can be operated, the second reproduction from the first reproduction form is performed. After the mode is switched, the second reproduction mode is used when the reception quality exceeds the predetermined quality level without waiting for the state in which the reception quality exceeds the predetermined quality level to be maintained for a certain period. A vehicle-mounted receiving device comprising control means for controlling the reproduction mode switching means so as to return to the first reproduction mode. A broadcast signal including a first broadcast signal of a weak hierarchy and a second broadcast signal of a strong hierarchy, which is digitally broadcast by hierarchical transmission, is received by a reception unit, and the first broadcast signal received by the reception unit and An in-vehicle receiver that reproduces information based on one of the second broadcast signals,
Second playback using the second broadcast signal for information playback from the first playback mode using the first broadcast signal for playback of information when the reception quality of the broadcast signal at the receiver is reduced to a predetermined quality level After switching from the first playback mode to the second playback mode for a certain time from the timing of switching from the first playback mode to the second playback mode, the reception quality exceeds the predetermined quality level after maintaining the second playback mode regardless of the reception quality. A playback mode switching means for returning from the second playback mode to the first playback mode;
Vehicle state determination means for determining whether or not the vehicle is in a state in which a predetermined device can be operated;
When the reception quality is reduced to the predetermined quality level, if the vehicle state determination means determines that the vehicle is in a state in which the predetermined device can be operated, the second reproduction from the first reproduction form is performed. After switching to the mode, the playback mode switching means is configured to return from the second playback mode to the first playback mode when the reception quality exceeds the predetermined quality level without waiting for the predetermined time. A vehicle-mounted receiving device having control means for controlling. The vehicle-mounted receiving device according to claim 8 or 9, wherein the vehicle state determination means determines whether or not the vehicle is in a state in which a door lock actuator can operate. The vehicle-mounted receiving device according to claim 8, wherein the vehicle state determination unit determines whether or not the vehicle is in a state in which an actuator of a door mirror can operate.

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