JP5178667B2 - In-vehicle digital TV broadcast receiver - Google Patents

Description

  The present invention relates to an in-vehicle digital television broadcast receiver for notifying an earthquake early warning.

  Conventionally, a number of applications have been filed for transmitting emergency disaster prevention information related to earthquakes, tsunamis, weather, and the like to users.

  For example, in Patent Document 1, in order to reliably receive “emergency broadcast”, information on two transmission means is obtained, and if one of them is detected to be an emergency broadcast signal, the receiver in a standby state is received. Techniques for operating the are disclosed. Patent Document 2 discloses a technology related to a system for distributing an earthquake early warning using FM multiple waves or radio waves for mobile phones.

  On the other hand, in the case of digital broadcasting, it is known that a delay occurs due to the time required for digital signal processing as compared with conventional analog broadcasting. In order to improve the unnaturalness due to signal delay in this digital broadcast reception, for example, Patent Document 3 discloses a technique for delaying an audio signal in accordance with an image signal, and Patent Document 4 discloses. In addition, a technique for decoding with priority given only to time display is disclosed.

Special table 2003-517784 gazette JP 2006-145234 A JP 2008-42630 A JP 2001-136088 A

  The Earthquake Early Warning is public information that has been implemented by the Japan Meteorological Agency since October 2007, and is announced as a notice several seconds to several tens of seconds before the large earthquake shakes. It is also distributed through radio broadcast media.

  However, a time delay occurs in the broadcast media being received, particularly digital television broadcast, and in some cases, a delay of about 1 to 2 seconds may fall into a serious situation. In this way, when the emergency broadcast is intended for a notice in seconds such as “Emergency Earthquake Early Warning”, as shown in Patent Document 3, the unnaturalness of the mismatch between video and audio is not a problem, and time The effects of delays in obtaining information due to mechanical delays cannot be ignored. In particular, when receiving an earthquake early warning as described above with an in-vehicle digital TV broadcast receiver, in addition to the delay in obtaining the information described above, depending on the driving environment, there may be a situation where the received emergency radio wave is disturbed and the worst emergency earthquake early warning cannot be obtained .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an in-vehicle digital television broadcast receiver capable of transmitting an emergency earthquake bulletin to a user in a timely manner.

  In order to solve the above-described problems, an in-vehicle digital TV broadcast receiver according to the present invention includes a digital TV broadcast receiving unit that receives a digital TV broadcast, and an analog radio broadcast that is received asynchronously with the digital TV broadcast receiving unit. A radio broadcast receiving unit, an audio switching unit that receives a received audio signal from the digital television broadcast receiving unit and a received audio signal from the analog radio broadcast receiving unit, and selectively outputs one of them, and an emergency for analog radio broadcasting A control unit that detects a notification signal indicating earthquake early warning, detects the signal, controls the audio switching unit, and selectively outputs the received audio signal of the analog radio broadcast.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle-mounted digital television broadcast receiver which can transmit an emergency earthquake bulletin to a user timely can be provided.

It is a block diagram which shows the basic composition of the vehicle-mounted digital television broadcast receiver which concerns on Embodiment 1 of this invention. It is a block diagram which shows the detailed structure of the vehicle-mounted digital television broadcast receiver which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the vehicle-mounted digital television broadcast receiver which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a basic configuration of an in-vehicle digital television broadcast receiver (hereinafter referred to as an in-vehicle DTV broadcast receiver 1) according to the first embodiment.

  As shown in FIG. 1, an in-vehicle DTV broadcast receiver 1 according to Embodiment 1 includes a digital television broadcast receiver (hereinafter referred to as a DTV receiver 11) and an analog radio broadcast receiver (hereinafter referred to as a radio receiver). Unit 12), an earthquake early warning detection unit 13, a control unit 14 mounted on a microcomputer, and a voice switching unit 15.

  According to the basic configuration of FIG. 1, the radio reception unit 12 always receives an analog radio broadcast without depending on the operation state of the DTV reception unit 11. If the broadcast radio wave includes a notification signal indicating “Emergency Earthquake Early Warning”, the emergency earthquake early warning detection unit 13 detects the notification signal via the radio reception unit 12. The output of the earthquake early warning detection unit 13 is supplied to the control unit 14. Receiving this, the control unit 14 controls the audio switching unit 15 and outputs the output of the audio switching unit 15 that receives the audio output of the DTV reception unit 11 and the audio output of the radio reception unit 12 as input. Control to switch to the voice.

After outputting the sound related to the earthquake early warning described above, the sound switching unit 15 operates to switch to the sound of the DTV receiving unit 11 by an operation on the DTV receiver side.
With this basic configuration, when the in-vehicle DTV receiver 1 according to the first embodiment receives the “Earthquake Early Warning”, the voice is output immediately, so the user receives the DTV broadcast. It becomes possible to obtain early earthquake early warnings more quickly than.

  Here, the radio receiving unit 12, the earthquake early warning detection unit 13, the control unit 14, and the voice switching unit 15 have been described as always operating. However, in the case of the in-vehicle DTV broadcast receiver 1, an accessory power source Each is configured to operate only in a state where power is supplied.

In addition, the radio receiver 12 needs to be tuned to the frequency of a receivable broadcasting station in the same region depending on the travel location of the vehicle on which the in-vehicle DTV broadcast receiver 1 is mounted. Since the on-vehicle DTV broadcast receiver 1 originally has a reception area setting function, the channel selection operation can be realized by configuring the analog radio broadcast receiving station to be set simultaneously with this setting. .
For this reason, the radio receiving unit 12 has a configuration of a PLL (Phase Locked Loop) synthesizer tuner, and the control thereof is configured to be performed from the control unit 14.

  Further, since the radio receiving unit 12 needs to always be in a standby state for receiving an earthquake early warning regardless of the operating state of the DTV receiving unit 11, even if the DTV receiving unit 11 is in a non-operating state, the control unit 14 must always be in an operating state together with the radio receiver 12, but as described above, this can be dealt with by configuring the radio power receiving function to continue with an accessory power supply (not shown).

  Unlike the conventional emergency warning broadcast, the “Emergency Earthquake Warning” does not transmit a tone signal for automatic reception. For example, NHK uses a chime sound with a fixed pattern as an audio signal during “Emergency Earthquake Warning”. It is made to transmit as a signal. This signal can be detected by configuring the earthquake early warning detection unit 13 with, for example, a tone filter. In addition, since the “emergency earthquake warning” is repeatedly transmitted with a chime sound having a fixed pattern, the emergency earthquake warning detection unit 13 outputs an output by detecting a voltage change corresponding to two consecutive chime sounds, for example. Generation | occurrence | production of a misdetection can be suppressed by the method of generating.

  In addition, according to the in-vehicle DTV broadcast receiver 1 according to the first embodiment, since “emergency earthquake warning” is detected by analog radio broadcast, digital broadcast reception that may occur due to deterioration of the reception environment or the like is temporarily received. It can function effectively even in situations where it cannot be performed.

FIG. 2 is a block diagram showing a detailed configuration of the in-vehicle DTV broadcast receiver 1 according to the first embodiment.
2, blocks having the same numbers as the blocks shown in FIG. 1 have the same names and functions as those shown in FIG. 1, and thus description thereof is omitted here in order to avoid redundant description.

As shown in FIG. 2, the DTV receiving unit 11 and the radio receiving unit 12 are mounted as a control unit 14 and are subjected to channel selection control by, for example, a microcomputer.
A memory 22 is connected to the control unit 14, and information on broadcasting stations in each region is recorded in the memory 22. Usually, the in-vehicle DTV broadcast receiver 1 has a region setting function, and by selecting the region where the user lives by operating the operation unit 21, broadcast stations that can be received in that region are automatically set. It has become.

  For this reason, in the in-vehicle DTV broadcast receiver 1 according to the first embodiment, when the area setting is performed by writing the information of the radio broadcast station that notifies the “emergency earthquake early warning” in the memory 22. At the same time, the radio broadcasting stations that can be received in the same area are also set.

The digital broadcast signal received by the DTV receiver 11 is demodulated and separated into video and audio data signals, of which the video signal is sent to the video circuit 25 and the audio signal is sent to the DTV audio circuit 26. The signal is supplied to the control unit 14.
The video signal decoded by the video circuit 25 and converted into an analog signal is reproduced by a display unit 27 constituted by an LCD (Liquid Crystal Display Device) panel or the like, decoded by the DTV audio circuit 26 and converted into an analog signal. The audio signal is supplied to the audio switching unit 15. In addition, an audio signal obtained by demodulating an audio signal received by the radio receiving unit 12 is supplied from the radio audio circuit 23 to the audio switching unit 15 and is selected by the audio switching unit 15 under the control of the control unit 14. The output audio signal is output via the speaker 28.

  Note that the accessory power supply (ACC power supply 24) includes electrical components including the constituent blocks of the in-vehicle DTV broadcast receiver 1 according to the first embodiment when an ignition key operation is detected under the control of the control unit 14. It is a power source that supplies power to all products.

  According to the configuration described above, the radio reception unit 12 operates regardless of the reception state of the DTV broadcast by the DTV reception unit 11. Here, the DTV broadcast reception state will be described.

In the in-vehicle DTV broadcast receiver 1 according to the first embodiment, when the DTV receiver 11 receives the DTV broadcast, the radio receiver 12 waits for the “Earthquake Early Warning” broadcast, for example, receives the NHK first broadcast. Is working to be.
When “Emergency Earthquake Warning” is broadcast, it is known that a specific chime sound is generated at the beginning. This chime sound is detected by the earthquake early warning detection unit 13. The signal detected by the earthquake early warning detection unit 13 is supplied to the control unit 14 as, for example, a change in DC voltage. When the control unit 14 determines that it is an “emergency earthquake early warning” based on the voltage change, The audio switching unit 15 performs switching control so that the output of the radio audio circuit 23 is output to the speaker 28.

  FIG. 3 is a flowchart showing the operation of the in-vehicle DTV broadcast receiver 1 according to the first embodiment. Hereinafter, the operation of the in-vehicle DTV broadcast receiver 1 according to the first embodiment shown in FIGS. 1 and 2 will be described in detail with reference to the flowchart shown in FIG.

  According to FIG. 3, the control unit 14 first determines whether the in-vehicle DTV broadcast receiver 1 according to the first embodiment is receiving the DTV broadcast by the DTV reception unit 11 or disables the DTV broadcast reception (OFF). Is detected (step ST301). Here, if DTV reception is being performed or if DTV broadcast reception is in an OFF state (step ST301 “YES”), the control unit 14 sets the reception frequency of the radio reception unit 12 to “Earthquake Early Warning” NHK. The first broadcast is automatically set (step ST302). If the determination in step ST301 is “NO”, the determination in step ST301 is repeated.

  On the other hand, the control unit 14 monitors the output of the earthquake early warning detection unit 13 at regular time intervals (step ST303). Here, when the output of the earthquake early warning detection unit 13 coincides with a predetermined DC voltage change (standard pattern) (step ST304 “YES”), the control unit 14 receives the current radio reception unit 12 It is determined that the radio broadcast is “Earthquake Early Warning”, and the voice switching unit 15 is controlled to output the voice switching unit 15 to the DTV voice circuit 26 or the voice circuit output of another input source (not shown). To the radio audio circuit 23 output (step ST305). If the determination in step ST304 is “NO”, the determination in step ST304 is repeated.

  Although not shown in the flowchart of FIG. 3, the radio receiving unit 12, the earthquake early warning detection unit 13, the control unit 14, and the voice switching unit 15 described above are connected to the ACC power source with the ignition key inserted. Each of them operates without depending on the operation state of the DTV receiving unit 11 while the electric power of 24 is energized.

  As described above, according to the in-vehicle DTV broadcast receiver 1 according to the first embodiment, when the control unit 14 includes a notification signal indicating an emergency earthquake warning in the analog radio broadcast, the voice switching unit 15 , And by selecting and outputting the received audio signal of the analog radio broadcast, when the “Earthquake Early Warning” is received, the voice is quickly output. Therefore, the “Earthquake Early Warning” is received by the DTV broadcast. Compared to the case, it is possible to quickly obtain the earthquake early warning without delay in the digital signal processing, and the unexpected situation can be avoided.

In addition, according to the in-vehicle DTV broadcast receiver 1 according to the first embodiment, since “emergency earthquake warning” is detected by analog radio broadcast, digital broadcast reception that may occur due to deterioration of the reception environment or the like is temporarily received. Even in a situation where it is impossible to do so, as long as the vehicle is not traveling in a tunnel, the “emergency earthquake information” can be reliably received, so that normal operation is possible.
Furthermore, according to the in-vehicle DTV broadcast receiver 1 according to the first embodiment, under the control of the control unit 14, the radio reception unit 12 does not depend on the operating state of the DTV reception unit 11, and the DTV reception unit 11 Because the reception frequency of the broadcasting station set in the region with the receiving channel that can be received in is automatically selected, the user can save the trouble of setting the “Earthquake Early Warning” reception by analog radio broadcasting, the burden required for this reception setting Can also be reduced.

The functions of the control unit 14 shown in FIGS. 1 and 2 may be realized entirely by software, or at least a part thereof may be realized by hardware.
For example, the data processing of the control unit 14 "when the notification signal indicating the earthquake early warning is included in the analog radio broadcast, the audio switching unit 15 is controlled to selectively output the received audio signal of the analog radio broadcast". It may be realized on a computer by one or a plurality of programs, and at least a part thereof may be realized by hardware.

  DESCRIPTION OF SYMBOLS 1 In-vehicle digital television broadcast receiver (in-vehicle DTV broadcast receiver), 11 Digital television broadcast receiver (DTV receiver), 12 Analog radio broadcast receiver (radio receiver), 13 Earthquake early warning detection unit, 14 Control Unit, 15 audio switching unit, 21 operation unit, 22 memory, 23 radio audio circuit, 24 accessory power supply (ACC power supply), 25 video circuit, 26 DTV audio circuit, 27 display unit, 28 speaker.

Claims (4)

A digital TV broadcast receiver for receiving digital TV broadcasts;
An analog radio broadcast receiver that receives analog radio broadcasts asynchronously with the digital TV broadcast receiver;
Received audio signal by the digital television broadcast receiver and the received audio signal by the analog radio broadcast receiver, and an audio switching unit that selectively outputs one of them,
When the analog radio broadcast includes a notification signal indicating an earthquake early warning, the control unit that controls the audio switching unit and selectively outputs the received audio signal of the analog radio broadcast;
An in-vehicle digital television broadcast receiver characterized by comprising: The controller is
Determining that the analog radio broadcast received by the analog radio broadcast receiving unit is earthquake early warning when the output of the notification signal detection unit coincides with a predetermined DC voltage change, and controlling the voice switching unit; The in-vehicle digital television broadcast receiver according to claim 1. The analog radio broadcast receiver is
2. The reception frequency of a radio broadcast station in a region set by a reception channel that can be received by the digital television broadcast reception unit is selected regardless of an operating state of the digital television broadcast reception unit. Or the in-vehicle digital television broadcast receiver described in 2; The controller is
The in-vehicle digital television broadcast receiver according to any one of claims 1 to 3, wherein when the accessory power is turned on, the reception operation of the analog radio broadcast by the analog radio broadcast reception unit is started.

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