JP2007336211A - On-board broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To not only relax viewer's tediousness that the viewer cannot view a moving image during running of a vehicle but also secure the safety, by switching moving image display to still image display during running of the vehicle. <P>SOLUTION: An on-board broadcast receiver comprises: a broadcast receiving means (comprising an antenna 1, a tuner 2, an OFDM demodulation part 3, a demultiplexer 4, an audio decoder 5, a video decoder 6, a sound output part 8, and an image output part 9) for receiving a broadcast signal to output images and sounds; and a control means (main control part 7) which monitors a running state of the vehicle and displays a specific frame of a moving image included in a video as a still image when determining that the vehicle is in a running state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to an in-vehicle broadcast receiving apparatus suitable for receiving high-quality digital broadcasts.

  When a vehicle is running, if a moving image is displayed on an in-vehicle TV (TV), the driver may watch the screen and there is a risk of impairing driving safety. In addition, the Japan Automobile Manufacturers Association, an organization of automobile manufacturers, has voluntarily regulated for that purpose. That is, in order to ensure driving safety, a method of using a brake signal or a vehicle speed pulse and displaying a moving image while the vehicle is stopped but not displaying a moving image while traveling is used.

However, if nothing is displayed on the TV screen, there is a problem that passengers including the driver, that is, viewers are very bored. For this problem, for example, there is known a vehicle image display device that detects a driving state of a vehicle and switches from a moving image displayed on a TV screen to a static image that displays data of an operation management system (for example, , See Patent Document 1).
Also, in the same situation, FM multiplex broadcast receiver with display switching function that displays data related to traffic information (for example, see Patent Document 2), in-vehicle FM multiplex that performs fixed display such as “cannot be displayed because it is running” A broadcast receiving apparatus (see, for example, Patent Document 3) is also known.

JP 7-114691 A (paragraphs “0005” to “0006”, FIG. 1) Japanese Patent Laid-Open No. 7-123019 (paragraphs “0005” to “0006”, FIG. 1) JP-A-8-288872 (paragraphs “0005” to “0006”, “0018”, FIG. 4)

  According to the techniques disclosed in Patent Literature 1 and Patent Literature 2 described above, the static image for displaying the data of the operation management system or the data related to traffic information is related to the program that the viewer has watched. Display content, not necessarily acceptable to the viewer. Further, the fixed display disclosed in Patent Document 3 is out of the question.

  The present invention has been made to solve the above-described problems. By switching and displaying the moving image display to the still image display while the vehicle is traveling, the viewer is bored of being unable to see the moving image while traveling. An object is to obtain an in-vehicle broadcast receiving apparatus that can alleviate and ensure safety.

  In order to solve the above-described problems, an in-vehicle broadcast receiving apparatus according to the present invention monitors broadcast status of a vehicle by receiving broadcast and outputting video and audio, and monitors the running state of the vehicle, and determines that the vehicle is in the running state. And a control means for displaying a specific frame of a moving image included in the video as a still image.

  Further, the in-vehicle broadcast receiving apparatus of the present invention receives broadcast waves, demodulates and outputs a transport stream, and decodes a coded video stream included in the transport stream to generate a moving image. Alternatively, video decoding means for outputting a specific frame in a moving image, audio decoding means for decoding and outputting the encoded audio stream included in the transport stream, and running for detecting the running state of the vehicle The state detection means, the video output is displayed on the display monitor, the audio output is output to the speaker, the running state of the vehicle is monitored, and the moving image included in the video output is displayed while the vehicle is stopped. Control means for displaying a specific frame of a moving image as a still image when in a running state.

  According to the present invention, the moving image display is switched to the still image display while the vehicle is traveling, so that the viewer's boredom that the moving image cannot be viewed during the traveling can be alleviated and safety can be ensured. it can.

Embodiment 1 FIG.
1 is a block diagram showing an internal configuration of an in-vehicle broadcast receiving apparatus according to Embodiment 1 of the present invention.
1 includes an antenna 1, a tuner 2, an OFDM (Orthogonal Frequency Division Multiplexing) demodulator 3, a demultiplexer 4, an audio decoder 5 as an audio decoding unit, and a video decoding unit. A video decoder 6 as a means, a main control section 7 as a control means, an audio output section 8, a video output section 9, a brake signal generation section 10 as a running state detection means, a speaker 18 (SP), And a TV monitor 19.

In FIG. 1, digital broadcast radio waves are received by an antenna 1 and input to a tuner 2. Then, under the control of the main control unit 7, the frequency component of the channel to be selected is extracted by the tuner 2, and this frequency component is demodulated into a digital signal by the OFDM demodulating unit 3 to be sent to the demultiplexer 4 as a transport stream. Entered.
The demultiplexer 4 separates the audio stream, the video stream, and the service information (SI), and supplies them to the audio decoder 5, the video decoder 6, and the main control unit 7, respectively. The audio stream is decoded by the audio decoder 5 and is output as audio from the speaker 18 via the audio output unit 8. The video stream is decoded by the video decoder 6 and is output to the TV monitor via the video output unit 9. Further, SI information is input to the main control unit 7 and used for channel selection, display of a program guide, and the like.

Further, a signal corresponding to ON / OFF of the parking brake is output from the brake signal generator 10 and supplied to the main controller 7. The main control unit is constituted by, for example, a microprocessor (CPU), monitors the running state of the vehicle by the ON / OFF output of the parking brake from the brake signal generating unit 10, and determines that the vehicle is in the running state In addition, a specific frame of a moving image included in the video stream is displayed as a still image.
The antenna 1, the tuner 2, the OFDM demodulator 3, the demultiplexer 4, the audio decoder 5, the video decoder 6, the audio output unit 8, and the video output unit 9 receive broadcasts. The main control unit 7 monitors the running state of the vehicle, and when it is determined that the vehicle is in the running state, the main control unit 7 monitors the moving image included in the video. It functions as a control means for displaying a specific frame as a still image.

  FIG. 2 is a block diagram showing an expanded function of the internal configuration of the main controller 7 shown in FIG. In FIG. 2, the main control unit 7 includes a travel determination unit 71, a video decoder control unit 72, a video control unit 73, and a timer 74.

The traveling determination unit 71 determines whether the vehicle is in a stopped state or a traveling state by monitoring a signal corresponding to ON / OFF of the parking brake output from the brake signal generating unit 10, and performs video decoder control The unit 72 and the timer 74 are controlled.
Based on the output from the traveling determination unit 71, the video decoder control unit 72 instructs the video decoder 6 to display a moving image or a still image, and monitors the time count by the timer 74. The video control unit 73 has a function of outputting a moving image or a still image output from the video output unit 9 to the TV monitor 19 under the control of the video decoder control unit 72.

FIG. 3 is a flowchart cited for explaining the operation of the in-vehicle broadcast receiving apparatus according to Embodiment 1 of the present invention.
The operation of the first embodiment of the present invention shown in FIGS. 1 and 2 will be described in detail below with reference to the flowchart shown in FIG.

First, a signal corresponding to ON / OFF of the parking brake is output from the brake signal generation unit 10 (for example, a signal of “Low” level if it is ON, and a signal of “High” level if it is OFF). Unit 11 determines whether the vehicle is stopped or traveling according to the signal level (step ST301).
If it is determined that the vehicle is stopped (step ST301 “NO”), the video decoder control unit 72 outputs a moving image display instruction to the video decoder 6 (step ST302). Is output, and a moving image is displayed on the TV monitor 19 by the video control unit 73 via the video output unit 9. At this time, the travel determination unit 7 sets a “previous state” flag (not shown) assigned to the inside of the main control unit 7 to “stop” (step ST303), clears the timer 74 (resets to 0), and performs step The process returns to ST301 (step ST304).

On the other hand, in the determination process of step ST301, when it is determined that the vehicle is traveling based on the output from the brake signal generation unit 10 (step ST301 "YES"), the traveling determination unit 71 further includes the above-mentioned "previous state". The flag is referred to (step ST305).
Here, when the “previous state” flag has not yet been set to “running” (step ST305 “NO”), the traveling determination unit 71 determines that the vehicle has transitioned from the stopped state to the traveling state, and performs video decoder control. Control is passed to section 72. At this time, the video decoder control unit 72 outputs an instruction to control the display of the moving image frame displayed immediately before as a still image to the video decoder 6 (step ST306). As a result, a still image of the corresponding frame is output from the video decoder 6, and the still image is displayed on the TV monitor 19 by the video control unit 73 via the video output unit 9. At this time, the traveling determination unit 71 updates and sets the “previous state” flag to “traveling” (step ST307), resets the timer 74 to 0 (step ST308), starts the time measurement by the timer 74, and performs step ST301. The process returns (step ST309).

Next, in the determination process of step ST301, when it is determined that the vehicle is traveling based on the output from the brake signal generation unit 10 (step ST301 “YES”), the traveling determination unit 71 further includes the “previous state” described above. ”Flag is referred to (step ST305).
Here, when the “previous state” flag is set to “running” (step ST305 “YES”), the travel determination unit 71 determines that the vehicle is in the travel state, and the timer 74 times out ( It is determined whether or not a predetermined time is being measured (step ST310). Here, when a timeout is detected (step ST310 “YES”), the traveling state determination unit 71 transfers control to the video decoder control unit 72, and the video decoder control unit 72 updates the still image to the video decoder 6. An instruction is output (step ST311). As a result, the updated still image of the corresponding frame is output from the video decoder 6, and the still image is displayed on the TV monitor 19 by the video control unit 73 via the video output unit 9. At this time, travel determination unit 71 resets timer 74 to 0 (step ST312), restarts the time measurement by timer 74, and returns to the process of step ST301 (step ST313).

That is, here, every time the timer 74 measures a predetermined time such as 1 minute, an instruction to update a still image is output from the video decoder control unit 72 to the video decoder 6, and the video decoder 6 Accordingly, the still image displayed on the TV monitor 19 is updated.
Note that audio is output as audio data from the audio decoder 5 during viewing, and is always output from the speaker 18 via the audio output unit 8 regardless of whether the vehicle is running or stopped.

  As described above, according to the first embodiment of the present invention, the moving image and the still image are switched and displayed according to the traveling state of the vehicle (ON / OFF of the parking brake). Since the hand does not impair driving safety by watching the TV monitor 19 screen, and still images are displayed or updated using an appropriate time interval (timer setting), the viewer is not bored. The effect of being finished is obtained.

Embodiment 2. FIG.
FIG. 4 is a block diagram showing the internal configuration of the in-vehicle broadcast receiving apparatus according to Embodiment 2 of the present invention.
The difference from the first embodiment shown in FIG. 1 is that in the first embodiment, the running state detection means determines whether the vehicle is stopped or running by turning on / off the parking brake, and displays a moving image and a still image. Although the switching control is performed, in the second embodiment, it is assumed that the vehicle speed pulse generated by the vehicle speed pulse generation unit 15 is used instead of ON / OFF of the parking brake to determine whether the vehicle is stopped or traveling. Switching control is performed between a moving image and a still image. In addition, when using a vehicle speed pulse, in addition to detecting the two states when the vehicle is stopped and traveling, it is also possible to detect the vehicle traveling speed and change the time interval for updating the still image according to the speed information. It is. Other configurations are the same as those of the first embodiment shown in FIG.

  FIG. 5 is a block diagram showing an expanded function of the internal configuration of the main controller 7 shown in FIG. The difference from the first embodiment shown in FIG. 2 is that in the second embodiment, a vehicle speed determination unit 701 and a vehicle speed-update interval storage unit 702 are added in place of the travel determination unit 71 of the first embodiment. is there. Other configurations (video decoder control unit 72, video control unit 73, and timer 74) are the same.

The vehicle speed determination unit 701 determines a vehicle speed from a pulse having a frequency corresponding to the vehicle speed generated by the vehicle speed pulse generation unit 15, and sets a predetermined update time interval in the timer 74 according to the speed. In other words, the vehicle speed-update interval storage unit 702 is updated as the vehicle speed (here, the hourly speed) increases, for example, 10 seconds if the vehicle speed is less than 10 km / h, 20 seconds if the vehicle speed is 10 km or more and less than 20 km / h. A timer set value is stored so that the interval is set longer. The vehicle speed determination unit 701 refers to the vehicle speed-update interval storage unit 702 according to the vehicle speed, acquires the timer setting value, and controls the timer 74 to control the update cycle of the still image.
Based on the output from the vehicle speed determination unit 701, the video decoder control unit 72 instructs the video decoder 6 to display a moving image or a still image, and also monitors the time count by the timer 74 to display the video. The control unit 73 outputs the moving image or still image output from the video output unit 9 to the TV monitor 19 under the control of the video decoder control unit 72.

FIG. 6 shows a flowchart cited for explaining the operation of the in-vehicle broadcast receiving apparatus according to the second embodiment of the present invention.
The difference from the first embodiment shown in FIG. 3 is that, when the “previous state” flag indicates “running” (step ST606 “YES”), the vehicle speed determination unit 701 performs the vehicle speed-update time interval storage unit 702. , And a process (step ST614) of setting a predetermined time related to the still image update according to the vehicle speed in the timer 74 is added.

Subsequently, when a timeout (update time) is detected (step ST610 “YES”), control is transferred to the video decoder control unit 72, and the video decoder control unit 72 instructs the video decoder 6 to update a still image. Output (step ST611).
As a result, the updated still image of the corresponding frame is output from the video decoder 6, and the still image is displayed on the TV monitor 19 by the video control unit 73 via the video output unit 9. At this time, the vehicle speed determination unit 701 resets the timer 74 to 0 (step ST612), restarts the time measurement by the timer 74, and returns to the process of step ST601 (step ST613).

In the determination process of step ST601, when it is determined that the vehicle is stopped (step ST601 “NO”), and in the determination process of step ST605, the vehicle is changed from the stop state to the travel state (step ST605 “ Since the operation of “NO”) is the same as that of the first embodiment shown in FIG. 3, the description is omitted here in order to avoid duplication.
That is, here, every time the timer 74 measures a predetermined update time interval such as 30 seconds, for example, an instruction to update a still image is output from the video decoder control unit 72 to the video decoder 6, and the video decoder 6 In accordance with this instruction, the still image displayed on the TV monitor 19 is updated and displayed. As in the first embodiment shown in FIG. 3, the audio is output as audio data from the audio decoder 5 during viewing, regardless of whether the vehicle is running or stopped, and the speaker 18 is connected via the audio output unit 8. Always output.

According to the second embodiment described above, since the control is performed so that the update cycle of the still image is changed according to the vehicle speed determined from the vehicle speed pulse, for example, the still image is updated at a relatively short cycle during low-speed traveling. In addition, during high-speed traveling, it is possible to control to update a still image with a relatively long cycle. As a result, it is possible to provide the viewer with as many still images as possible while maintaining driving safety.
In Embodiment 2 described above, the vehicle speed-update interval storage unit 702 stores the update cycle for each vehicle speed, and the update interval is changed stepwise according to the vehicle speed. Further, the update interval may be set finely so as to be inversely proportional to the vehicle speed.

In the second embodiment described above, the update cycle of the still image is changed according to the vehicle speed at that time, but it is determined whether or not the vehicle is congested from the temporal transition of the vehicle speed, and the still image according to the result. The update cycle may be changed. A block diagram in which the internal configuration of the main control unit 7 used at this time is shown in functional development is shown in FIG. 7 as a modified example of the second embodiment, and an operation conceptual diagram thereof is shown in FIG.
In FIG. 8, (a) shows the speed, (b) shows the running state, and (c) shows the media type (moving image / still image) displayed on the TV monitor screen.

As shown in FIG. 7, in the modification of the second embodiment shown here, the difference from the second embodiment shown in FIG. 4 is that the time series determination unit 711 replaces the vehicle speed determination unit 701 with the vehicle speed-update. A speed time-series data storage unit 712 is added instead of the interval storage unit 702. Others are the same as in the second embodiment.
The time-series determination unit 711 monitors time-series data related to the vehicle traveling speed for a predetermined period accumulated in the speed time-series data storage unit 712, and determines that the vehicle is traveling at a predetermined speed for a predetermined time or more. When it is determined that it is a traffic jam, the update time interval of the still image is set to be short, and when it is determined that the vehicle is traveling at a speed other than that, control is performed to set it longer than the previous update time interval.

Specifically, as shown in FIG. 8, the time series determination unit 711 refers to time series data stored in the speed time series data storage unit 712 within a predetermined time, and the speed is, for example, 1 minute. For example, if the vehicle is traveling at a constant speed or less, such as 20 km / h, for a certain period of time or more, it is determined that the vehicle is congested. Thereafter, until the speed exceeds a certain speed (20 km / h), Update with a short cycle of seconds. When it exceeds, a still image shall be updated with a long period like a 1 minute period, for example.
As described above, it is determined whether or not the vehicle is congested based on the temporal transition of the speed of the vehicle, and by switching the update cycle of the still image, as much stationary as possible during the traffic jam while maintaining driving safety. The effect that an image can be provided to the viewer is obtained.

Embodiment 3 FIG.
In Embodiment 1 and Embodiment 2 described above, when the still image is updated, the timer 74 is controlled to display the still image at the time when a predetermined time has elapsed, but if the reception state at that time is bad, A still image mixed with noise is displayed for a long time, which is not preferable. Therefore, here, an embodiment capable of obtaining a high-quality still image display by focusing on the reception state will be described.

FIG. 9 is a block diagram showing an internal configuration of the in-vehicle broadcast receiving apparatus according to Embodiment 3 of the present invention. The difference from the second embodiment shown in FIG. 4 is that the video memory 17 is connected to the video decoder 6, and the main control unit 7 monitors the reception state by the output of the video decoder 6.
The video memory 17 holds only video whose decoding error (noise) is a predetermined value or less, and is held in the video memory 17 when the main control unit 7 determines that a predetermined time has elapsed. Output as a still image.

  FIG. 10 is a block diagram showing an expanded function of the internal configuration of the main controller 7 shown in FIG. As shown in FIG. 10, the main control unit 7 includes a reception state monitoring unit 721, an update determination unit 722, a threshold storage unit 723, a video decoder control unit 72, a video control unit 73, and a timer 74. Composed.

The reception state monitoring unit 721 monitors the reception state (decoding error by the video decoder 6) based on the output of the video decoder 6, refers to the threshold stored in the threshold storage unit 723, and the reception state is equal to or higher than a predetermined level (decoding error). Only the still images whose number is equal to or less than the threshold value are sequentially stored in the video memory 17.
In addition, the update determination unit 722 determines whether the vehicle is in a stopped state or a traveling state by monitoring a signal corresponding to the vehicle speed output from the vehicle speed pulse generation unit 15, and a video decoder control unit An instruction for switching from moving image to still image display is output to 72, and the still image finally stored in the video memory 17 is displayed every time the still image is updated based on the output of the timer 74. Therefore, an update instruction is output to the video decoder control unit 72.

Based on the output from the update determination unit 722, the video decoder control unit 72 instructs the video decoder 6 to display a moving image or a still image, and monitors the time count by the timer 74.
Under the control of the video decoder control unit 72, the video control unit 73 outputs the moving image or still image output from the video output unit 9 to the TV monitor 19.

FIG. 11 is an operation conceptual diagram cited for explaining the operation of the in-vehicle broadcast receiving apparatus according to Embodiment 3 of the present invention. 11, (a) is the video decoder output 6, (b) is the content of the video memory 17, (c) is the output of the timer 74, (d) is a still image displayed on the TV monitor 19, and (e) is elapsed. Show each of the time.
The operation of the third embodiment of the present invention shown in FIGS. 9 and 10 will be described below with reference to the operation conceptual diagram of FIG.

Here, first, since the noise of the video V1 decoded by the video decoder 6 is determined to be equal to or less than the threshold by the reception status monitoring unit 721 (low noise), under the control of the update determination unit 722 and the video decoder control unit 72, The video decoder 6 holds the still image V1 in the video memory 17.
Since the subsequent still images V2 and V3 are determined to have noise equal to or higher than the threshold value, the still images V2 and V3 are not held in the video memory 17, and therefore the still image V1 remains in the video memory 17. Subsequently, the noise of the still image V4 is determined to be equal to or less than the threshold by the reception status monitoring unit 721. Under the control of the update determining unit 722 and the video decoder control unit 72, the content of the video memory 17 is changed from the still image V1 to the still image. Updated to V4 and held.

Here, if the timer 74 detects the update cycle at the timing of the elapsed time t = t2, since the still picture V1 is held in the video memory 17 at this time, the TV monitor 19 has V1 as a still picture. Is displayed.
Next, if an update cycle is detected at the timing t = t8, since the still image V7 is held in the video memory 17 at this time, V7 is displayed on the TV monitor 19 as a still image.

As described above, according to the third embodiment, in order to perform control so that only video with a good reception state (error when decoding is equal to or less than a threshold) is stored in the video memory 17 and a still image is displayed from now on. Even in an environment where the reception state fluctuates, a high-quality video with relatively little noise can be displayed as a still image.
According to the third embodiment described above, when the decoding error is equal to or less than the threshold value, the still image is controlled to be held in the video memory 17, but the video memory 17 is decoded from the previously held video. The update determination unit 722 controls to update when a still image with few errors arrives, and outputs an update instruction to the video decoder control unit 722 to clear the video memory 17 every time the still image is updated. It is also possible to control the TV monitor 19 to display a video with the least decoding error within the still image update cycle. As a result, a still image with higher quality can be displayed.

Embodiment 4 FIG.
According to the first to third embodiments described above, the mode in which one of the moving image frames is displayed as a still image on one screen has been described. A thumbnail display may be used in which a plurality of still images are displayed side by side on the screen.
In the fourth embodiment described below, the entire configuration is the same as that of the in-vehicle broadcast receiving device of the third embodiment shown in FIG. Further, the internal configuration of the main control unit 7 used at that time is developed as shown in FIG. 12, and its operation conceptual diagram is shown in FIG. The fourth embodiment of the present invention will be described below with reference to FIGS.

In FIG. 12, the main control unit 7 includes a vehicle speed determination unit 701, a screen division control unit 731, a screen work memory 732, a video decoder control unit 72, a video control unit 73, and a timer 74. .
The vehicle speed determination unit 701 determines a vehicle speed from a pulse having a frequency corresponding to the vehicle speed generated by the vehicle speed pulse generation unit 15, and sets a predetermined update time interval in the timer 74 according to the speed. Data relating to this update time interval (timer set value) is stored in a built-in memory, and is the same as in the second embodiment in which the update cycle of still images is controlled by controlling the timer 74. Further, the screen division control unit 731 is activated by the output of the timer 74 and performs control to divide and display the moving image frame displayed immediately before as a still image for each still image update cycle. In the screen work memory 732, each still image is reduced by this screen division control, and display data relating to a copy of the frame memory 17 in which a plurality of still images are arranged in one screen is stored. In addition, it is also possible to use the brake signal generation unit 10 instead of the vehicle speed pulse generation unit 15 as the traveling state detection means.

  Based on outputs from the vehicle speed determination unit 701 and the screen division control unit 731, the video decoder control unit 72 instructs the video decoder 6 to display a moving image or a still image. The video controller 73 outputs the moving image or still image output from the video output unit 9 to the TV monitor 19 under the control of the video decoder controller 72.

As shown in FIG. 13, the vehicle is stopped until time t = t0, and a moving image is displayed on the entire TV monitor 19 screen. Then, after the time t = t1, the vehicle transitions to the running state, and each time the timer 74 measures the update time as time t = t2, t3, t4..., The still image is reduced each time by the screen division control unit 731. The screen work memory 732 is additionally updated and transferred to the video memory 17. Under the control of the video decoder control unit 72, the thumbnail image held in the video memory 17 is read by the video decoder 6 and displayed on the TV monitor 19 via the video output unit 9.
Further, when time t = t5, the upper left still image displayed at time t = t1 is updated to the latest still image. Thereafter, still images are sequentially updated. In FIG. 13, four-screen division is described as an example, but the number of divisions is arbitrary, such as nine screens and sixteen screens.

  According to the above-described fourth embodiment, thumbnail display reduces the boredom of viewers who cannot watch videos while driving, and also ensures safety by changing the update interval according to the vehicle speed, etc. However, since the story of the program can be estimated to some extent, a still image with a high visual effect can be obtained.

The main control unit 7 is configured by an IC chip including a microprocessor, ROM, RAM, and peripheral LSIs in terms of hardware, and the microprocessor sequentially reads and executes a program recorded in the ROM. The peripheral LSI including the RAM is controlled, and when it is determined that the vehicle is in a running state, the specific frame of the moving image is controlled to be displayed as a still image.
At this time, the vehicle speed-update interval storage unit 702 in FIG. 5, the speed time-series data storage unit 712 in FIG. 7, the threshold storage unit 723 in FIG. 10, and the screen work memory 732 in FIG. In addition, the traveling determination unit 71, the vehicle speed determination unit 701, the time series determination unit 711, the reception status determination unit 721, the update determination unit 722, the screen division control unit 731, the video decoder control unit 72, the video control unit 73, and the timer 74 Each of these functions is realized by the microprocessor sequentially reading and executing the program recorded in the ROM. The peripheral LSI referred to here is for communicating with a microprocessor prepared for connecting each component block constituting the broadcast receiving means, such as the tuner 2, the speaker 18, the TV monitor 19, and the like. I / O port.

It is a block diagram which shows the internal structure of the vehicle-mounted broadcast receiving apparatus concerning Embodiment 1 of this invention. FIG. 2 is a block diagram showing an expanded function of an internal configuration of a main control unit 7 shown in FIG. 1. It is the flowchart quoted in order to demonstrate operation | movement of the vehicle-mounted broadcast receiving apparatus concerning Embodiment 1 of this invention. It is a block diagram which shows the internal structure of the vehicle-mounted broadcast receiving apparatus concerning Embodiment 2 of this invention. FIG. 2 is a block diagram showing an expanded function of an internal configuration of a main control unit 7 shown in FIG. 1. It is the flowchart quoted in order to demonstrate operation | movement of the vehicle-mounted broadcast receiver concerning Embodiment 2 of this invention. It is a block diagram which shows the modification (internal structure of the main-control part) of the vehicle-mounted broadcast receiver concerning Embodiment 2 of this invention. FIG. 8 is an operation conceptual diagram quoted for explaining the operation of the modified example shown in FIG. 7. It is a block diagram which shows the internal structure of the vehicle-mounted broadcast receiving apparatus concerning Embodiment 3 of this invention. FIG. 10 is a block diagram showing an expanded function of the internal configuration of the main control unit 7 shown in FIG. 9. It is the flowchart quoted in order to demonstrate operation | movement of the vehicle-mounted broadcast receiver concerning Embodiment 3 of this invention. It is a block diagram which shows the vehicle-mounted broadcast receiving apparatus (internal structure of the main-control part 7) concerning Embodiment 4 of this invention. It is the operation | movement conceptual diagram quoted in order to demonstrate operation | movement of the vehicle-mounted broadcast receiver concerning Embodiment 4 of this invention.

Explanation of symbols

1 antenna (broadcast receiving means), 2 tuner (broadcast receiving means), 3 OFDM demodulator (broadcast receiving means), 4 demultiplexer (broadcast receiving means), 5 audio decoder (audio decoding means), 6 video decoder (video decoding) Means), 7 main control section (control means), 8 audio output section, 9 video output section, 10 brake signal generation section (running state detection means), 15 vehicle speed signal generation section (running state detection means), 17 video memory, 18 speaker, 19 TV monitor, 71 travel determination unit, 72 video decoder control unit, 73 video control unit,
74 timer, 701 vehicle speed determination unit, 702 vehicle speed-update interval storage unit, 711 time series determination unit, 712 speed time series data storage unit, 721 reception status monitoring unit, 722 update determination unit, 723 threshold storage unit, 731 screen division control Part, 732 Screen work memory.

Claims (10)

Broadcast receiving means for receiving broadcast and outputting video and audio;
Control means for monitoring the running state of the vehicle and displaying a specific frame of the moving image included in the video as a still image when it is determined that the vehicle is in the running state;
An in-vehicle broadcast receiver characterized by comprising: The broadcast receiving means includes
Receiving a broadcast wave, demodulating and outputting a transport stream, decoding a coded video stream included in the transport stream, and outputting a video or a specific frame in the video The in-vehicle broadcast receiver according to claim 1, wherein the encoded audio stream included in the transport stream is decoded and output as audio. The control means includes
The in-vehicle broadcast receiving apparatus according to claim 1, wherein the moving image frame displayed immediately before is displayed as a still image at a timing when the vehicle transitions from a stopped state to a traveling state. The control means includes
The in-vehicle broadcast receiving apparatus according to claim 1, wherein the moving image frame displayed immediately before is displayed as a still image at a predetermined update time interval while the vehicle is running. The control means includes
The in-vehicle broadcast receiving apparatus according to claim 4, wherein an update time interval of the still image is controlled in accordance with a traveling speed of the vehicle. The control means includes
When the time series of the traveling speed of the vehicle is monitored and it is determined that the vehicle is traveling for a predetermined time or more and a predetermined speed or less, the update time interval of the still image is set short, and the vehicle travels other than the above. The in-vehicle broadcast receiving apparatus according to claim 5, wherein when it is determined that the update time interval is set, the update time interval is set longer than the update time interval. The control means includes
The reception state is monitored by the video output of the broadcast receiving means, and still images whose reception state is a predetermined value or more are sequentially held in the video memory, and the still image finally held in the video memory at each update time interval. 5. The in-vehicle broadcast receiving apparatus according to claim 4, wherein an image is displayed. The control means includes
The reception state is monitored by the video output of the broadcast receiving means, the still image with the best reception state is held in the video memory at each of the update time intervals, and the still image held in the video memory is displayed. The in-vehicle broadcast receiver according to claim 4. The control means includes
The in-vehicle broadcast receiving apparatus according to claim 1, wherein the moving image frame displayed immediately before the predetermined time interval is divided into a plurality of screens and displayed as a still image. A digital broadcast receiving means for receiving and demodulating a broadcast wave and outputting a transport stream;
Video decoding means for decoding the encoded video stream included in the transport stream to output a video or a specific frame in the video;
Audio decoding means for decoding and outputting the encoded audio stream included in the transport stream;
Traveling state detecting means for detecting the traveling state of the vehicle;
The video output is displayed on a display monitor, the audio output is output to a speaker, the running state of the vehicle is monitored, a moving image included in the video output is displayed while the vehicle is stopped, and the vehicle is running. Control means for displaying a specific frame of the moving image as a still image,
An in-vehicle broadcast receiver characterized by comprising:

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