JP4086952B2 - Video playback device in car navigation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a moving image reproducing apparatus in a car navigation apparatus that reproduces a recording medium such as an optical disc on which various types of information including map information, video information, and moving image information are recorded.
[0002]
[Prior art]
Vehicle guidance devices (hereinafter referred to as “car navigation devices”) using GPS (Grobal Positioning System) are becoming widespread among automobile users due to their advanced vehicle driving support technology. Typical examples of the driving support function possessed by this car navigation device are a destination setting function, a current location setting function, and a route search function.
[0003]
The destination route search function automatically searches for an optimum travel route from the position of the vehicle obtained by GPS to the destination with reference to road node data. Here, GPS refers to a system that receives radio waves radiated from artificial satellites and measures the current position of a vehicle traveling on the ground. The destination setting function displays a detailed road map in the vicinity of where the car is driving on the in-vehicle display, moves the cursor to the part corresponding to the vehicle position by setting means using remote control keys, etc. The vehicle position is determined.
[0004]
In addition to these functions of the car navigation device, in recent years, a new function has been installed that can reproduce a moving image recorded in a car by playing a recording medium on which a moving image is recorded by the device. It's getting on. In order to display moving images, first of all, a medium capable of recording / reproducing the necessary amount of moving image information is required. However, a DVD (Digital-Versetile / (Video) -Disc) medium is a ROM medium (reading). A dedicated medium) can secure a capacity of about 4.7 GByte, and is suitable as a reproduction medium for moving image. Realization of the route search function, which is the main function of the car navigation device, requires a medium on which map information is recorded. However, if a DVD-ROM medium is used, a detailed map of Japan is recorded on one medium. It is also excellent in terms of operability in that it eliminates the hassle of replacing the medium as when using a CD-ROM medium.
[0005]
The map information image in the conventional road information guide is almost equivalent to the map display in which roads are drawn with lines, and buildings, sightseeing spots, traffic lights, etc. are represented with symbolic characters and character strings added. However, when a movie is added to the road, it is possible to switch to a movie that is close to a complex route with complicated intersections and roads. In addition, it is possible to construct a device that can guide a scene as if it is traveling on the spot, and can proceed without worrying while moving while looking at a dense and complex map screen such as a building. Became.
[0006]
[Problems to be solved by the invention]
As described above, in recent years, a device that reproduces a recording medium capable of storing a large amount of data such as a DVD-ROM can be installed in a car navigation device, and its functions have been enhanced. The first priority is to ensure safe driving. Recreational images such as movies should not be played while driving, creating an environment where the driver's attention is disengaged from the driving operation.
[0007]
However, on the other hand, if a situation is set in which a video or other image is played back only when the vehicle is stopped, the passenger will be shown intermittent videos intermittently, and although consideration for the driver will be given, to the passenger The entertainment provision function will be significantly reduced. With this level of software provision function, even if it is intended to spread as an in-vehicle product, the radio broadcast receiver, which is a medium that provides information smoothly, will continue to be accepted as before, Although it is a product equipped with high functions, there is a risk that it will stop spreading to the in-vehicle field without fully exhibiting the characteristics and functions that it has.
[0008]
In addition, providing a video playback function in situations that do not require entertainment provision may hinder demand due to dangers that can be induced by video playback and insufficient measures to avoid the dangers. is there.
[0009]
The present invention has been made in view of the above-mentioned problems of the prior art, and a first object of the present invention is to use a car navigation device equipped with a function capable of displaying a moving image by reproducing a large-capacity recording medium. An object of the present invention is to provide a moving image reproducing apparatus for car navigation that can provide an entertainment moving image service such as a movie to passengers without disturbing the driver's attention while driving.
[0010]
A second object of the present invention is to provide a moving picture reproducing apparatus for car navigation capable of providing entertainment information such as moving pictures without impairing the function of road guidance based on the route search inherent in the car navigation apparatus. It is to be.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a moving image reproducing apparatus in a car navigation apparatus according to the present invention includes a pickup for irradiating a recording medium on which an information recording track is formed and irradiating a light beam to detect a reading signal containing information, and from the reading signal. Storage means for storing the extracted information, memory control means for demodulating and outputting the information stored in the storage means, and reproducing the moving picture information and audio information stored in the recording medium and displaying the sound while displaying the image Disc reproducing means having output means for outputting, vehicle speed detecting means for detecting vehicle speed, brake means detecting means for detecting on / off states of brake means such as side brakes, the speed detecting means and brake operation detection When it is determined that the moving body is stopped based on the output of the means, a moving image is displayed on the output means and the moving image is displayed. While for outputting the synchronized audio, when it is determined that the moving object based on the speed detection means and the detection means is traveling, and displays the image in a moving image as a still image When Playback control means for continuously outputting sound Be equipped It is what
[0012]
Thereby, even while the vehicle is traveling, the watching of the moving image can be provided to the passenger without delay without damaging the driver's attention about the driving situation.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Main departure Tomorrow , A pickup for detecting a read signal containing information by irradiating a recording medium on which an information recording track is formed, a storage means for storing information extracted from the read signal, and information stored in the storage means There are mounted a memory control means for demodulating and outputting, a disk reproducing means having an output means for reproducing moving image information and audio information stored in a recording medium and outputting sound while displaying an image, and the disk reproducing means. Speed detecting means for detecting the speed of the moving body, brake operation detecting means for detecting whether or not the brake means for stopping the moving body is in an operating state, and outputs of the speed detecting means and the brake operation detecting means Based on the above, when it is determined that the moving body is stopped, the output means displays a moving image and outputs a sound synchronized with the moving image. On the other hand, when it is determined that the moving body is traveling based on the speed detection means and the detection means, a playback control means for displaying the image in the moving image as a still image and continuously outputting the sound is provided. It is the moving image reproducing device in the car navigation device characterized. This departure According to Meiji, even if the moving body is moved and no moving image is displayed, the story development of the reproduction medium is continuously output only by sound.
[0014]
Also book invention Is The above In the moving picture playback device in the car navigation device, the playback control means switches the playback operation content according to the individual information management content related to playback of the playback recording medium when playback of the playback recording medium being played back is completed while the mobile body is traveling. It is characterized by this. This departure According to Ming, the driver and passengers can inform the end of the playback operation of the medium by displaying the menu on the screen, and select the next playback mode even after the end of playback by issuing an operation command to the menu screen. It has the effect that an opportunity can be obtained.
[0015]
In addition, this departure Ming , The aforementioned -In the video playback device in the navigation device, the playback control means comprises a recording means for intermittently recording still image data from past videos in the storage means, and when the moving speed of the moving body is detected, the image display of the output means N Pieces When playing a video when the vehicle is stopped During In this case, n number of still screens are arbitrarily divided and displayed from the image data that has been reproduced. This departure According to Ming, an image sequence that generally represents the story development of a moving image that was output before the vehicle started to travel is displayed on the display.
[0016]
Main departure Ming , The aforementioned -When a moving image data stream is interrupted in a video playback device in a navigation device Carved N apart from the video data later Pieces Still image data from the recording medium, and the read n Pieces The still image data is displayed on an n-divided image display unit. This departure According to Meiji, there is an effect that the content of the still image displayed on the divided screen on the display is output almost coincident with the audio output content of the medium and the reproduction time zone.
[0017]
Main departure Ming , The aforementioned -In a video playback device in a navigation device, n Pieces N output to the image display section divided into screens Pieces Among the still child screens, a still image closest to an image displayed by a moving image synchronized with a continuously output audio signal is highlighted. This departure According to Ming, by highlighting one screen among intermittent n still images prefetched during driving, the image corresponding to the audio output data is displayed in association with each other. .
[0018]
Main departure Tomorrow , The aforementioned The moving image reproducing device in the navigation device includes switching means for switching the capacity of the storage means used for demodulating moving image data and audio data read from the recording medium while the moving body is stopped. This departure According to the present invention, it is possible to secure a large capacity of the storage means for expanding the voice data while the vehicle is running by using the switching means.
[0019]
Main departure Tomorrow , The aforementioned -In a moving image playback device in a navigation device, a recording means for recording information of a data stream position at which a moving image is interrupted, and a measurement for measuring a time during which the output means displays a still image because the moving body is moving Means for determining the video start position of the next moving image based on the measurement time when the moving image is restored to the playback state again after the moving image playback operation is temporarily interrupted. . This departure According to the invention, the control means has an effect that the video output immediately before the start of the vehicle travel can be reproduced again when the next turning image is reproduced.
[0020]
Main departure Ming , The aforementioned -In a moving image reproducing apparatus in a navigation apparatus, the apparatus includes a video signal reproducing means including an imaging element and a video signal converting element that converts image information obtained from the imaging element into a video signal. Reproduction switching means for switching the display signal of the image display unit between the main video signal and the sub-video signal based on the outputs of the speed detection means and the brake operation detection means, with the image data from the disk reproduction means as a main image signal. It is provided. This departure According to Ming, the playback switching means outputs to the main screen content that is more important in the scene of the image information requested by the driver or passenger when the vehicle starts and when it is stopped Has the effect of being able to
[0021]
Main departure Tomorrow , The aforementioned -The video playback device in the navigation device includes playback control means for changing the physical screen size for projecting the video information switched to the sub-picture information based on the increase / decrease in the speed detection amount of the moving body immediately after switching. It is. This departure According to Meiji, the use of the reproduction control means has the effect that the vehicle passenger can follow the video of the moving image with his eyes for some time immediately after starting the vehicle.
[0022]
[Car Navigation Device According to Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an example of the configuration of a moving image playback apparatus in a car navigation apparatus that implements an embodiment of the present invention.
[0023]
In FIG. 1, reference numeral 1 denotes a system control unit (CPU). The system control unit 1 is composed of, for example, a host microcomputer, and controls the overall operation of the apparatus as a whole, and generates a switching signal according to the running / stopped state of the vehicle.
[0024]
Reference numeral 2 denotes an optical disk device that reads data from a large-capacity recording medium represented by a DVD-ROM. Reference numeral 101 denotes a large-capacity recording medium using an optical disc such as a DVD-ROM. The recording medium 101 is rotated by a spindle motor 102. Reference numeral 103 denotes an optical pickup that reads information recorded on the recording medium 101. This optical pickup includes a feeding mechanism such as a pickup driving motor 104, and a servo control circuit 107 is connected to these motor mechanisms.
[0025]
A control signal is supplied to the servo control circuit 107 from the driver control microcomputer 108, and the optical pickup can be focus servo and tracking servo based on the focus error and tracking error signal extracted from the reproduction signal of the optical pickup 103. Has been. Reference numeral 105 denotes an RF circuit that extracts information from the read signal. The signal binarized by the RF circuit 105 is subjected to data correction / signal demodulation by the error correction circuit 106 and input to an AV decoder block described later.
[0026]
Video CDs and DVDs have been put to practical use as optical discs for recording moving images as digital data and their playback devices. The data is compressed by the Moving Picture Experts Group (MPEG) method and synchronized with the media. It is recorded as stream data together with audio information to be reproduced.
[0027]
An AV decoder block 3 includes an MPEG decoder 110, a decoder control microcomputer 116, and an on-screen display control unit 114. The MPEG decoder 110 includes a decoding buffer memory 111, an audio / image separation unit 112, an audio decoder 113, and a video decoder 114.
[0028]
The AV decoder block 3 performs predetermined processing on the error-corrected stream data and converts it into a video signal or an audio signal. The signal separation unit 112 receives the digital data sequence transferred from the data buffer memory 109 and discriminates the stream ID and substream ID of the header in each logical block unit, so that the image data, audio data, management information pack Sort. In this distribution, the image data is output to the video decoder 114 and the audio data is output to the audio decoder 113. Here, when displaying a character string representing the subtitle or the volume set by the operator during playback, the on-screen display control device 115 receives a character display command from the decoder control microcomputer and receives a desired character string. A timing signal for synthesizing the character data inside the video decoder and a necessary color signal are output.
[0029]
4 Is an audio data storage block, and includes an audio buffer memory control unit 117 and an audio buffer memory 118. The audio buffer memory control unit 117 controls the capacity of the audio buffer memory based on the switching signal.
[0030]
In this example, a vehicle speed detector 127, which is a vehicle speed detecting means for detecting a vehicle speed, which will be described later, and a side brake operation detector 128, which is a brake means detecting means for detecting an on / off state of a brake means such as a side brake, are provided. When the control circuit 9 detects that the vehicle has started running based on signals from these, the memory capacity allocated to the audio decoding area of the decoding buffer memory 111 is increased. This is to ensure a sufficient area for data reading because the video must capture still image data while driving and the audio must continue to be output under external vibration.
[0031]
The audio data storage block 4 sequentially stores digital data as a result of decompressing a signal compressed in accordance with the MPEG standard, and is output through an audio D / A converter and an output means through a speaker 13 that outputs sound. The
[0032]
A D / A converter unit 5 includes an audio D / A converter 119, a video D / A converter 120, and a selector 121 that is switched by a switching signal.
[0033]
Reference numeral 6 denotes a multi-screen generation field control block, which includes a synchronous separation D / A converter 122, a multi-screen generation / field screen memory control circuit 123, and a video signal buffer memory 124.
[0034]
The multi-screen generation field control block 6 has a function of controlling writing / reading of the digital video signal obtained by the video encoder / D / A converter 120 to / from the video signal buffer memory 124.
[0035]
A GPS vehicle position detection block 7 includes a GSP receiver 125 and an output means 126.
[0036]
A vehicle state detection block 8 includes a vehicle speed detector 127 that detects the speed of the vehicle and a side brake operation detector 128 that detects the state of the side brake.
[0037]
9 is connected to the vehicle position detection block 7 and the vehicle state detection block 8 and outputs a current vehicle position, a current vehicle traveling speed, and a side brake on / off state to the system control unit 1. It is a block.
[0038]
Reference numeral 10 denotes a video image capturing block around the vehicle, which is a video signal reproducing means, and an image sensor 129, a video signal processing circuit 130, and a video D / A converter 131 installed to monitor the range of the blind spot from the driver's seat. Consists of. A sub-image is output from this block.
[0039]
Reference numeral 11 denotes a video signal switching block for selecting an image signal to be output to the display monitor.
[0040]
Based on the switching signal, the main video / sub-video switching control circuit 132 serving as a playback switching means reads a moving image (main image) obtained by reading out the recording medium and an image obtained from the video photographing block 10 around the vehicle ( One of the sub-images) is displayed on the main screen, and the video output signal is controlled to output the other to the sub-screen. Under the situation where the side brake is applied and the vehicle is completely stopped, it is not necessary to switch between the main video and sub video, and the video read out from the recording medium can be output as the main video as it is. The system control 1 is set so that the decoder output signal is output to the display monitor 12 which is an output means for displaying an image without passing through the video / sub-video switching control circuit 132.
[0041]
[Operation of Apparatus According to Embodiment]
The operation of the moving picture playback device of the car navigation device having the above configuration will be described below. FIG. 2 explains the operation of the present apparatus based on the flowchart for explaining the moving picture reproducing operation of the moving picture reproducing apparatus according to the present embodiment and the conceptual diagrams shown in FIGS. In FIG. 2, when the moving image playback operation is started, the system control unit 1 checks whether the vehicle is stopped or running in the vehicle state detection block 8 in a processing step (hereinafter simply referred to as step) S201. If the vehicle is stopped, normal moving image display and audio output are performed (S202).
[0042]
At this time, when the user sets a display method in which n still screens are extracted from past moving images immediately before traveling and displayed on the display monitor 12 when the vehicle starts traveling, the field memory control block 6 Performs the following operations.
[0043]
While the vehicle is stopped, the moving image is continuously output from the display monitor 12 to the main screen, and the data line 5A is selected by the selector 121 as the output path of the playback video signal. Meanwhile, the video field control block 6 performs an operation of intermittently storing the still image data Gi in the memory every time Ti.
[0044]
Once the image signal D / A converted by the video encoder D / A converter 120 is input to the field memory control block 6, the horizontal / vertical synchronization signal of the image is separated, and the synchronization separation A / D converter 122 is separated. Thus, A / D conversion is performed in the state of color signal and luminance signal components. Then, it is stored in the video signal buffer memory 124 at a timing generated from the separated synchronization signal. When the vehicle starts running and the stored image signal is output, a horizontal / vertical synchronization signal corresponding to the number of screen division settings of the display monitor is added and output to the data line 5B.
[0045]
The number n of still screen data to be displayed on the display monitor 12 is set by the system controller 1, and the system controller 1 selects the data line 5A as the video signal input path. Based on this setting signal, the multi-screen generation / field screen memory control circuit 123 performs a control operation and stores still screen data corresponding to n screens in the video signal buffer memory 124. In the case where the vehicle is still stopped after storing still screen data corresponding to n screens in the video signal buffer memory 124, the image data G is stored in the memory area where the data G1 is stored first at time T1. (N + 1) is overwritten, and the n still image screens closest to the time of the screen on which the moving image is currently being reproduced are always stored in the memory (S202). When the vehicle starts to run and a predetermined vehicle speed is detected, the data line 5B is selected by the system control unit 1 as the output path of the playback video signal (S203). Then, the display monitor 12 is extracted from the video that has been output as a moving image while the vehicle is stopped. Pieces The still image is displayed on the display monitor 12 as shown in FIG.
[0046]
On the other hand, as another setting example, n synchronized with the sound output immediately after traveling, Pieces To display a still image of Together As shown in FIG. 4, a data stream having an address corresponding to a time earlier by (1 / n) * Ta is first read from the medium from the address of the medium on which the currently reproduced audio data is recorded. Necessary. When this is completed, the data stream at the address corresponding to the previous time is further read out by (1 / n) * Ta, and is executed n times in total. In the meantime, since the audio output cannot be interrupted, the data stored in the audio data buffer memory 118 is sequentially output to the audio D / A converter through the control of the buffer memory control circuit 117 during the operation, and the still image The audio data continues to be output so that the audio output is not interrupted during access to read the data. When the remaining capacity of the audio data in the audio data buffer memory 118 decreases, the control microcomputer 108 of the disk device gives priority to the audio data read operation over the image data pre-read operation.
[0047]
By executing this operation, n still images arbitrarily extracted from a video stream that cannot be viewed as a moving image while traveling are output on the display monitor.
[0048]
At this time, the address of the data output from the audio buffer memory 118 to the D / A converter 119 is compared with the addresses of the n field images output as still images, and the address of the image data is the audio data. The addition processing of the luminance signal in the range corresponding to the image field closest to the address is performed in the field memory control block 6, whereby the contents of the audio output data and the still image are visually associated one-to-one. .
[0049]
Further, when the time has elapsed without stopping the vehicle and the reproduction of the medium is completed (S204), the display on the display monitor is an operation for outputting a title menu display screen unique to the medium. Enter The After the disc playback is completed, the optical disc apparatus reads the title menu data and switches the screen to the title menu (S205).
[0050]
Here, the data structure of the DVD-ROM, which is a high-density recording medium, is a complex structure, and how to access and reproduce individual data recorded on the medium. There is an area in which the content of whether to realize is managed. This data area is referred to as a “file system management file”. This part includes data peculiar to the disc, and the reproduction mode depends on this data structure. For example, after the medium A is inserted into the optical disk, the A disk starts playback without accepting an external command, the B disk displays the title menu once, receives the title menu command, and executes it. After the end of playback, playback management information such as executing a default playback menu built in its own disc if a command by key operation does not occur for a certain period of time is recorded.
[0051]
In the state of S205, when the reproduction is finished once during traveling, the subsequent reproduction mode is determined according to the contents of the file management information of the medium. That is, for a disc whose playback menu is determined by default, a disc that has a file management system that performs playback based on the contents of the file information and can select the next playback operation from the menu title screen. With regard to, a control algorithm is provided that performs an operation according to a command issued by the user. Thus, it is possible to avoid issuing an extra command from the outside for the reproduction of the medium in which the default reproduction mode is set in advance in the file management system, and to prevent a malfunction that may occur due to this (S206 to S214). .
[0052]
Data addresses regarding n still images displayed during traveling are recorded in the field memory control block 6. When the vehicle stops from the running state and reproduces the moving image again, the moving image address is determined based on the address of the still image displayed so far. As a result, when the user adopts a playback method in which the sound and image of the movie are always played back only when the vehicle is stopped in the operation menu, the moving image is cut off from the block shown in S201 to the block shown in S203. The video is started from the moving image before time t3 from the screen, and the moving image can be reproduced from the scene immediately before the previous video is interrupted (S215).
[0053]
In addition, until the state changes from the block of S202 to the block shown in S203 and reaches a predetermined vehicle speed, the display on the display monitor 12 is an image obtained from the video shooting block 10 and a moving image from the medium. Two images are output (FIG. 5).
[0054]
That is, the main screen / sub-screen video switching control circuit 132 of the video signal switching block 11 inputs from the system control block 1 a traveling start detection signal indicating that the vehicle has started traveling and a speed signal. When the vehicle starts to move (S201), the video display screen that has been output on the main screen 1 until now is switched to the sub-image, and the video output of the video shooting block 10 is displayed on the main screen. (S501). Further, as the detection speed increases, the display size of the sub screen is reduced (S502 to S504). When a certain speed St km / h is reached, the output of the sub screen video is stopped and the main screen display is also a still image. Changes to a state of displaying (S203). After that, even if the vehicle speed is reduced, the main screen / sub-screen split display does not appear until the vehicle stops again and starts moving.
Through such a series of operations, the moving image reproducing device in the car navigation device according to the present embodiment displays moving images.
[0055]
【The invention's effect】
As explained above, Main departure According to Ming, it is possible to eliminate the attention of the driver while driving the vehicle from being attracted to the moving image on the display monitor, and the story development of the reproduced moving image can be recognized by voice. The invention described in the following claims has the following effects in addition to the above effects.
[0056]
Main departure According to Meiji, according to the file management information content of the medium, the passenger can select and execute the next reproduction operation by key operation even while traveling.
[0057]
Main departure According to Ming, since the intermittent scenes of the playback content immediately before the start of vehicle travel are extracted and displayed on the display monitor, it is possible to grasp the story development during video playback.
[0058]
Main departure According to Ming, passengers can see intermittent still images and roughly check the development of the story of a moving image expressed by audio output.
[0059]
Main departure According to Ming, the passenger can instantly determine the correspondence between the voice and the screen just by looking at the display monitor, and the neighborhood of the still images in the n sub-screens developed on the display monitor You can know if it is deployed with audio output.
[0060]
Main departure According to Ming, it is possible to mitigate the skipping phenomenon of the reproduced sound that is likely to occur when data reading from the medium is impaired due to vehicle vibration or the like, and it is possible to avoid the situation where the sound flies at every access failure.
[0061]
Main departure According to Ming, if you always want to watch images and audio at the same time, you can re-output the video just before the video was interrupted for a certain amount of time, and the viewer can view the same scene again, It has the effect that the scene development can be organized and a new next video scene can be seen.
[0062]
Main departure According to Ming, it is possible to recognize the blind spot image of the vehicle that should be paid attention when starting the vehicle with the main image, it is possible to grasp the situation around the vehicle, and a display for checking the surroundings when starting the vehicle There is an effect that the monitor can be used as a display monitor for entertainment.
[0063]
Main departure According to Ming, it is possible to avoid a situation in which the video image is suddenly interrupted every time the vehicle starts, even if the driving speed is about the slow speed. If Even though the screen is small, it is possible to follow the situation of the moving image for a while, so that viewers' discomfort is reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a vehicle guidance device according to an embodiment of the present invention.
FIG. 2 is a playback control flowchart related to video playback from the start to stop of vehicle travel.
FIG. 3 is a conceptual diagram regarding display on a display monitor under the operation shown in claim 3 in the embodiment of the present invention;
FIG. 4 is a conceptual diagram relating to display on a display monitor under the operation shown in claim 4 in the embodiment of the present invention;
FIG. 5 is a reproduction control flowchart regarding moving image reproduction according to claims 8 and 9 of the embodiment of the present invention;
[Explanation of symbols]
1 Host microcomputer for overall control of this device
2 Optical disk device
3 AV decoder section
4 Audio data storage
5 AV data D / A converter
6 Field memory controller
7 Vehicle position detection function
8 Speed detection circuit
9 Running state detection circuit
10 Video shooting section around the vehicle
11 Video signal switching section
12 Display monitor
13 Speaker
101 optical disc
102 Spindle motor
103 pickup
104 Pickup drive motor
105 RF circuit
106 Demodulation and error correction circuit
107 Servo control circuit
108 Driver control microcomputer
109 Buffer memory for data read from disk
110 MPEG decoder
111 Decoding buffer memory
112 Image / sound separation circuit
113 Audio decoder
114 video decoder
115 On-screen display control
116 Decoder control microcomputer
117 Audio buffer memory control
118 Audio buffer memory
119 Audio D / A Converter
120 Video encoder / D / A converter
121 Video signal selector
122 Sync separation / additional A / D, D / A conversion circuit
123 Field screen memory control circuit
124 Video signal buffer memory
125 GPS
126 In-house position detection circuit
127 On-board speed detector
128 Side brake detection circuit
129 Image sensor
130 Video signal processing circuit
131 Video D / A Converter
132 Main screen / sub-screen switching control circuit
133 Video switch

Claims (1)

A video playback device,
This video playback device
When the vehicle is running, it is for outputting a still image obtained from a moving image to the display monitor and outputting a sound corresponding to the audio data continuously .
Decoding buffer memory;
On condition that the vehicle starts to travel, and means for increasing the memory capacity allocated to the audio decoding region of the decoding buffer memory.

Images