JP2008072525A - In-vehicle digital broadcasting receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-vehicle digital broadcasting receiving system which can prevent viewing interruption of digital television broadcasting, even if an in-vehicle digital broadcasting receiver is placed in an abnormal operating environment. <P>SOLUTION: The in-vehicle digital broadcasting receiving system has a selector 40, which selectively switches selection video signals SV that are to be outputted, to an in-vehicle display apparatus 50 between video signals V1, acquired from a digital broadcasting receiver 10 that receives digital television broadcasting signals and video signals V2 acquired from a cellular phone 20 that receives digital television broadcasting signals; and a controller 30 which controls output from the selector 40, depending on the operating environment in which a digital television broadcasting receiver 10 is placed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle digital broadcast receiving system that receives terrestrial digital television broadcasts and the like in a vehicle.

Digital terrestrial television broadcasting has also started in Japan, enabling high-quality video, program guides, program information, weather forecast data broadcasting, interactive services, etc. that cannot be obtained with conventional terrestrial analog television broadcasting It has become. In addition, a technique related to an in-vehicle digital broadcast receiving apparatus for viewing this digital terrestrial television broadcast in a vehicle that is a moving body has been developed (see, for example, Patent Document 1).
JP 2003-234972 A

By the way, when the digital broadcast receiving device is mounted on the vehicle, the space for mounting the digital broadcast receiving device is limited to a narrow space around the dashboard of the vehicle, so the device is smaller than the home digital broadcast receiving device. It is necessary to make it.
When the digital broadcast receiving apparatus is downsized, heat generated in a circuit in the apparatus tends to be trapped in the casing of the apparatus, and the decoding circuit and the like are likely to become high temperature. In addition, since the temperature inside the vehicle varies greatly depending on the weather or the like, the in-vehicle digital broadcast receiving device is more likely to be placed in a high temperature environment than the home digital broadcast receiving device. Furthermore, since the decoding circuit or the like in the digital broadcast receiving apparatus processes a high frequency signal, it easily generates heat.
A general in-vehicle digital broadcast receiving apparatus outputs an alarm signal indicating that the temperature is high in order to prevent a failure of a circuit or the like when the apparatus is placed in an operating environment in which the temperature rises above a certain temperature. The decoding process is interrupted. For this reason, when the decoding process is stopped, the vehicle occupant cannot view the video until the alarm signal is released.
In addition, in-vehicle digital broadcast receivers may be placed in an operating environment where the electric field strength of digital television broadcast waves is not sufficient depending on the location of the vehicle, etc. In this case as well, the video is completely blocked. The passenger cannot see the video.

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is to enable digital TV broadcasting even when the in-vehicle digital broadcasting receiver is placed in an abnormal operating environment. An object of the present invention is to provide a vehicle-mounted digital broadcast receiving system that can prevent viewing from being interrupted.

An in-vehicle digital broadcast receiving system according to the present invention includes a digital broadcast receiver that receives a digital television broadcast signal, a video signal obtained from the digital broadcast receiver, and a video signal obtained from a mobile terminal that receives the digital television broadcast signal. Selection means for selectively switching the output to the in-vehicle display device between, and a control means for controlling the output of the selection means according to the operating environment where the digital broadcast receiver is placed,
Have
According to this configuration, since the digital TV broadcast signal can be received by either the digital broadcast receiver or the portable terminal and the video can be output to the display device, it is possible to prevent the viewing of the digital TV broadcast from being interrupted. .

  In the above configuration, when it is determined that the operating environment in which the digital broadcast receiver is placed is abnormal, the control means obtains the output of the selection means from the mobile terminal from the video signal obtained from the digital broadcast receiver. When the operating environment in which the digital broadcasting receiver is placed is determined to have returned to normal, the output of the selection means is returned to the video signal obtained from the digital broadcasting receiver. it can.

  The said structure can employ | adopt the structure that the said control means judges whether the said operating environment is abnormal based on the temperature of the said digital broadcast receiver.

  In the above-described configuration, the control unit may determine whether the operating environment is abnormal based on a reception sensitivity of a digital television broadcast signal received by the digital broadcast receiver.

  In the above configuration, the digital broadcast receiver and the mobile terminal receive digital broadcast signals of different bands, and the control means receives the broadcast received by the digital broadcast receiver when controlling the output of the selection means. It is possible to adopt a configuration in which the reception channel of the portable terminal is controlled so as to select a channel having the same broadcast content as the content.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the vehicle-mounted digital broadcast receiver is set | placed in the abnormal operating environment, it can prevent that viewing / listening of a digital television broadcast is interrupted.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of an in-vehicle digital broadcast receiving system according to an embodiment of the present invention.
This in-vehicle digital broadcast receiving system includes a digital TV broadcast receiver 10 (hereinafter referred to as receiver 10), a mobile phone 20, a controller 30 as control means, a selector 40 as selection means, and a display device as in-vehicle display device. 50 etc.

  The in-vehicle digital broadcast receiving system according to this embodiment is for terrestrial digital broadcasting in Japan. As is well known, in terrestrial digital broadcasting in Japan, a 6 MHz broadcast wave is divided into 13 bands (segments), and a carrier modulation scheme and a convolutional code coding rate can be selected for each segment. ing. Actually, since a band for one segment is prepared as a guard band, the band of one segment is 429 kHz. So-called One Seg is a broadcasting service for mobile communication devices (portable terminals) such as mobile phones using this one segment, and the remaining 12 segments are used for digital terrestrial broadcasting. The content of the 1-segment broadcast is currently a simultaneous broadcast that transmits the same video as the 12-segment broadcast.

The receiver 10 decodes the above-mentioned digital television broadcast signal of terrestrial digital broadcast (12 segment broadcast) received by an antenna (not shown), extracts the video signal V1, and outputs it to the display device 50 via the selector 40.
The receiver 10 includes a temperature sensor (not shown) therein. When the internal temperature of the receiver 10 exceeds a predetermined temperature, the receiver 10 outputs a high-temperature warning signal HTS to the controller 30 and processes the received digital television broadcast signal. Is formed to interrupt. Further, when the internal temperature falls below a predetermined temperature, the output of the high temperature warning signal HTS is stopped and the processing of the digital television broadcast signal is resumed.

The receiver 10 is configured to output a reception sensitivity signal SS indicating the electric field strength of the received digital television broadcast signal to the controller 30.
Further, although not shown, the receiver 10 is configured to be able to output channel information of a currently received broadcast to the controller 30.
The digital television broadcast receiver 10 extracts an audio signal together with the video signal V1, but since the processing circuit of the digital television broadcast receiver 10 is a well-known technique, the description thereof is omitted.

The cellular phone 20 receives and decodes the above-mentioned one-segment broadcasting digital television signal to generate a video signal, outputs the video signal to its own display unit, and is connected to the display device 50 via the selector 40 so as to be output. Yes.
In addition, the mobile phone 20 is connected to the controller 30 so that power on / off and channel selection are controlled by a control signal CT1 from the controller 30 and various data DT1 can be output to the controller 32. Yes.

The controller 30 includes hardware such as a processor and a memory, and necessary software. When the receiver 10 is in a high temperature state, a high temperature warning signal HTS is input from the receiver 10, The reception sensitivity SS of the digital television signal received by the receiver 10 is also input.
In addition, the controller 30 outputs a control signal CT1 to the mobile phone 20 in order to control power on / off of the mobile phone 20, switching of a reception channel, and the like, and can receive various data DT1 from the mobile phone 20. Is formed.
Further, the controller 30 outputs a control signal CT2 for switching the video signal to the selector 40.

  The selector 40 selects one of the video signal V1 from the receiver 10 and the video signal V2 from the mobile phone 20 according to the control signal CT2 from the controller 30, and displays the selected video signal SV on the display device 50. Note that the video quality from the receiver 10 is high in the video from the receiver 10 and the video from the mobile phone 20 because the amount of signal information on the receiver 10 side is large.

Next, an example of processing of the controller 30 will be described with reference to FIGS.
2 is a flowchart showing an example of the main process of the controller 30, FIG. 3 is a flowchart showing an example of the abnormality determination process, and FIG. 4 is a flowchart showing an example of the return process. Note that the controller 30 periodically repeats the process shown in FIG.

First, as shown in FIG. 2, it is determined whether or not the system including the receiver 10, the selector 40, the display device 50, and the like is activated (step ST1). Wait until the timing.
If the system is activated, the control signal CT2 is output to the selector 40 so that the video signal V1 of the receiver 10 is output to the display device 50 as the selected video signal SV (step ST2). Thus, the video signal V1 of the receiver 10 is output to the display device 50 as the selected video signal SV, and the digital terrestrial television broadcast can be viewed on the display device 50.

Next, it is determined whether or not the mobile phone 20 is connected (step ST3). If the mobile phone 20 is not connected, the process ends. If it is connected, an abnormality determination process described later is executed (step ST4). ).
Next, after executing the abnormality determination process, it is determined whether or not the abnormality flag indicating the occurrence of abnormality is turned on (step ST5). If the abnormality flag is turned off, the process is terminated and the abnormality flag is turned on. If YES in step 8 (ST6), a return process described later is executed.

Next, the abnormality determination process described above will be described with reference to FIG. 3. First, reception channel information currently received by the receiver 10 is acquired from the receiver 10 (step ST41).
Next, it is determined whether the high temperature warning signal HTS from the receiver 10 is turned on (step ST42). That is, it is determined whether the temperature in the receiver 10 which is the operating environment of the receiver 10 is abnormal.
When the high temperature warning signal HTS is in an off state, that is, when the temperature in the receiver 10 is not abnormal, it is determined whether or not the reception sensitivity SS from the receiver 10 is equal to or lower than a predetermined value (step ST43). That is, it is determined whether the operating environment for receiving the digital television signal of the receiver 10 is abnormal. If not abnormal, the process is terminated.

If the high temperature warning signal HTS is turned on in step ST42 (the receiver 10 has stopped the decoding process), or if the reception sensitivity SS in step ST43 is less than or equal to a predetermined value, the receiver 10 Judge that the current operating environment is abnormal.
In this case, it is determined whether the mobile phone 20 is powered on (step ST44). If the power is off, the control command CT1 is output to the mobile phone 20 (step ST45).
When the power of the mobile phone 20 is on, the channel is switched to the one-segment broadcasting channel that is broadcasting the same content as the channel currently received by the receiver 10 (step ST46). As a result, the broadcast content received by the receiver 10 and the broadcast content received by the mobile phone 20 are the same.

Next, the control signal CT2 is output to the selector 40, and the selected video signal SV of the selector 40 is switched from the video signal V1 of the receiver 10 to the video signal V2 of the mobile phone 20 (step ST46). Thereby, the video based on the video signal V2 is output to the display device 50, and a one-segment broadcast having the same content as the digital terrestrial television broadcast can be viewed. That is, the user can continuously watch the same content broadcast by switching from the video signal V1 of the receiver 10 to the video signal V2 of the mobile phone 20.
Also, since 1-segment broadcasting is for mobile communication, the receivable range is wider than that of terrestrial digital television broadcasting, and even if the reception sensitivity of terrestrial digital television broadcasting is reduced, 1-segment broadcasting can be received. . For this reason, when the reception sensitivity SS of the receiver 10 is lowered, if the selected video signal SV to be output to the display device 50 is switched from the video signal V1 to the video signal V2, it is possible to continuously watch the same content broadcast.

Next, the return process described above will be described with reference to FIG. 4. First, it is determined whether the high temperature warning signal HTS is off (step ST61). That is, it is determined whether the temperature of the receiver 10 has decreased and the decoding process has been resumed. If the high temperature warning signal HTS is on, the process ends.
On the other hand, when the high temperature warning signal HTS is off, it is determined whether or not the reception sensitivity SS of the receiver 10 has been restored to a predetermined level or more. Outputs the control signal CT2 to the selector 40, and switches the selected video signal SV of the selector 40 from the video signal V2 of the mobile phone 20 to the video signal V1 of the receiver 10 (step ST63). Thereby, the video based on the video signal V11 is output to the display device 50, and the digital terrestrial television broadcast can be viewed again.
Then, the control signal CT1 is output to the mobile phone 20 and the power supply is turned off (step ST64). Since the abnormal operating environment is restored to the normal operating environment, the abnormal flag is turned off (step ST65).

  As described above, according to the present embodiment, when the operation environment such as the reception environment of the digital TV signal and the temperature environment of the receiver 10 is abnormal, the function of receiving the digital TV signal of the mobile phone 20 is provided instead. Since the video can be output to the display device 50 by using it, it is possible to prevent the viewing of the digital television broadcast from being interrupted without requiring a user operation.

In the above-described embodiment, the mobile phone 20 has been described as an example of the mobile terminal. However, any mobile terminal that can receive one-segment broadcasting other than the mobile phone 20 can be applied to the present invention.
Further, in the above embodiment, the broadcast content received by the receiver 10 and the broadcast content received by the mobile phone 20 are controlled to be the same, but it is also possible to output broadcast images with different contents. .

It is a block diagram of the vehicle-mounted digital broadcast receiving system which concerns on one Embodiment of this invention. It is a flowchart which shows an example of the process of the main routine in a controller. It is a flowchart which shows an example of the abnormality determination process routine of FIG. It is a flowchart which shows an example of the return process routine of FIG.

Explanation of symbols

10. Digital TV broadcast receiver (Digital TV broadcast receiver)
20 ... Mobile phone (mobile terminal)
30 ... Controller (control means)
31 ... Abnormality determination unit 32 ... Mobile phone communication / control unit 33 ... Selector control unit 40 ... Selector (selection means)
50 ... Display device (vehicle display device)
V1, V2 ... Video signal SV ... Selected video signal (output)

Claims (5)

Selection means for selectively switching the output to an in-vehicle display device between a video signal obtained from a digital broadcast receiver that receives a digital TV broadcast signal and a video signal obtained from a portable terminal that receives the digital TV broadcast signal When,
Control means for controlling the output of the selection means in accordance with the operating environment in which the digital broadcast receiver is placed;
A vehicle-mounted digital broadcast receiving system.   When the control means determines that the operating environment in which the digital broadcast receiver is placed is abnormal, the control means changes the output of the selection means from the video signal obtained from the digital broadcast receiver to the video signal obtained from the portable terminal. The output of the selection means is returned to the video signal obtained from the digital broadcast receiver when it is determined that the operating environment in which the digital broadcast receiver is placed has returned to normal. The in-vehicle digital broadcast receiving system according to 1.   The in-vehicle digital broadcast receiving system according to claim 2, wherein the control unit determines whether the operating environment is abnormal based on a temperature of the digital broadcast receiver.   The in-vehicle digital broadcast receiving system according to claim 2, wherein the control means determines whether the operating environment is abnormal based on reception sensitivity of a digital television broadcast signal received by the digital broadcast receiver. . The digital broadcast receiver and the mobile terminal receive digital broadcast signals of different bands,
The control means controls the reception channel of the portable terminal so as to select a channel having the same broadcast content as the broadcast content received by the digital broadcast receiver when controlling the output of the selection means. The in-vehicle digital broadcast receiving system according to any one of claims 1 to 4.

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