JPH07284061A - Reproducing method for storage type recording medium - Google Patents

Abstract

PURPOSE:To promptly output pictures without irregularities when a power source is tentatively turned off and turned on again. CONSTITUTION:When a video CD 1 is inserted to a set, a controller 2A performs loading by a loading part 11, performs the continuous reproduction control of respective parts, reads MPEG data from the video CD 1 by a data read part 3, separates them into the pictures and audio by a demultiplexer 4 and then decodes them to picture data and audio data by an MPEG video decoder 5 and an MPEG audio decoder 6. During reproduction, the controller 2A stores the position information of an I picture read latest from the video CD 1 in a memory 15 which is turned to non-volatile, and when an ACC is turned on again after it is tentatively turned off, controls the data read part 3 based on the position information stored in the memory 15, searches the I picture and reproduces the I picture and the succeeding pictures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing method for a storage type recording medium, and in particular, compressed image data consisting of three types of pictures of I, P and B is stored in a storage type recording medium such as a disk or tape according to the MPEG format. The present invention relates to a reproducing method of a recorded storage type recording medium.

[0002]

2. Description of the Related Art A video CD in which compressed audio data and compressed image data are recorded on a disc in a CD-ROM format in a time-division manner, and AV reproduction of up to 98 tracks is possible.
Has been put to practical use. In this video CD, audio and images are highly efficiently coded (compressed) by a method called MPEG1, and an example of the hierarchical structure of compressed image data is shown in FIG.
Shown in. The basic unit of compressed image data is a GOP (group of pictures) layer, and one GOP is composed of a plurality of (15 is recommended) pictures in which three types of pictures of I, P, and B are combined. It The I picture is an intra-frame coded image and can be independently decoded, but has the largest data amount. The P picture is an inter-frame predictive coded image, and is predictively coded based on the past I or P picture. The B picture is a picture peculiar to MPEG, and is inter-frame predictive coded bidirectionally from a past I or P picture and a future I or P picture, and has a small amount of data. The P picture is an intermediate amount of data between the I picture and the B picture.

[0003] Incidentally, for the convenience of decoding, recording order of the on video CD original order of each picture (reproduction order) is different as shown in FIG. 20, the picture B ₁ of 15 sheets of the original, B ₂ , I ₃ , B ₄ , B ₅ , P ₆ , B ₇ ,
_{B 8, P 9, B 10} , B 11, P 12, B 13, B 14, P 15 is I ₃ is on the recording _{medium, B 1, B 2, P} 6, B 4, B 5, P
₉ , B ₇ , B ₈ , P ₁₂ , B ₁₀ , B ₁₁ , P ₁₅ , B ₁₃ , B ₁₄
And is reproduced in the same order as the original picture at the time of reproduction. P ₆
The picture is decoded using the decoded I ₃ picture, and P
_{The 9} pictures are decoded using the P ₆ pictures after decoding. The B ₁ picture is the decoded I ₃ picture and the immediately preceding G.
Decoding is performed using P ₁₅ pictures after decoding in OP and interpolated pictures based on these. The B ₄ picture is decoded by using the I ₃ picture and the P ₆ picture after decoding and the interpolated picture based on these. A video sequence layer is composed of one or a plurality of GOPs having the same image size and image rate, and the GOP layer is composed of 15 picture layers divided for each picture. The picture layer is further hierarchically divided into a slice layer, a macroblock layer, and a block layer.

In the header of the sequence layer, following the sequence start code, the characteristics of the compressed image data necessary for decoding such as image size and image rate (display rate) are recorded, and independent reproduction is possible in sequence units. Has become. The position can be specified in picture units by the time code recorded together with the GOP start code in the header of the GOP layer and the time reference recorded together with the picture start code in the header of the picture layer.
Also, the picture layer header contains the I, P,
The picture type indicating which one is B is also recorded. Sequence header information and picture layer information,
It is possible to replay the screen one by one. The compressed image data and the compressed music data are individually packetized, and then the packet of the compressed image data and the packet of the compressed music data are combined and packed into a fixed data amount. Then, it is recorded on the video CD in a predetermined CD-ROM format.

FIG. 21 shows the basic structure of a video CD player. In the video CD 1, the data reading unit 3 under the control of the controller 2 reads the recorded data in the CD-ROM format. Then, unpacking and header information are detected by the demultiplexer 4, and the header information and the packet data are output to the MPEG video decoder 5 and the MPEG audio decoder 6 separately for the image and the music. M
The PEG video decoder 5 decodes the compressed image data according to the characteristics of the image and the picture type, and the MPEG audio decoder 6 decodes the compressed image data according to the characteristics of the music. The decoded image data is converted into analog R, G, B signals or Y, C _r , C _b signals by the DA converter 7, and further converted into NTSC video signals by the NTSC encoder 8 for external display. The music data output to the device and decoded is converted into an analog music signal by the DA converter 9 and output to an external amplifier.

[0006]

By the way, a vehicle-mounted bidet
In case of CD player, video CD1 with ACC on
Is inserted in the set, the controller 2
Playback is started, and the playback operation is stopped when the ACC is turned off.
After this, ACC was turned on again and playback started.
At this time, the controller 2 controls the data reading unit 3
Search for the picture position that was read out immediately before ACC was turned off last time
Then, reading and reproducing the recorded data after the picture position
I do. However, the search target is B in FIG.₇Piku
If it's Cha, I just before₃, P ₆, P₉Compressed image data
B must be read and decrypted₇Picture
It cannot be decrypted, and for a while after ACC is turned on
During this period, no image appears on the screen, which frustrates the user. Service
The same applies when the search target is a P picture. Also play
During that time, a track jump occurred due to vibration, and playback was temporarily started.
Circuit protector because the temperature has stopped or the temperature has exceeded the specified value.
Even if the function is activated and playback is temporarily stopped, vibration will occur.
When it stops or the temperature falls below the specified value, it can be regenerated.
The picture position immediately before becoming unplayable,
Then, the playback operation is restarted, but the search target is a B picture or
If it is a P picture, it will be
For a while, the image does not appear on the screen or is disturbed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a reproducing method for a storage-type recording medium in which when a power supply is once turned off and then turned on again, an undistorted image is immediately output. Another object of the present invention is to provide a reproducing method for a storage-type recording medium in which an image without disturbance is promptly displayed even when reproduction becomes possible again due to vibration or the like.

[0008]

According to the present invention, there is provided a means for reproducing a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B are recorded according to the MPEG format, and storage. Means for storing the position information of the I picture most recently read from the type recording medium in the non-volatile memory, and the position stored in the memory by controlling the reproducing means when the power is turned off and then turned on again. The I picture is searched based on the information, and the I picture is searched.
This is achieved by providing means for performing reproduction after the picture.

[0009]

According to the present invention, during reproduction, the position information of the latest I picture read from the storage type recording medium is stored in the non-volatile memory, and when the power is turned off and then turned on again, it is stored in the memory. The I picture is searched based on the stored position information, and the I picture and subsequent pictures are reproduced. As a result, the I-picture can be completely decoded only with its own data, so when the power is turned off and then turned on again, the image output is continued immediately from the vicinity of the image displayed last time immediately before the power was turned off. Can be done
After the power is turned on, it is possible to prevent the screen from being disturbed for a long time, and the waiting time for the user is short.

During reproduction, the position information of the latest I picture read from the storage type recording medium is stored in the memory, and when reproduction is temporarily disabled and then enabled again,
The I picture is searched based on the position information stored in the memory, and the reproduction after the I picture is restarted. As a result, since the I picture can be completely decoded only by its own data, when it is temporarily unreproducible due to vibration or the like and then reproducible, it continues from the vicinity of the image immediately before it becomes unreproducible. In this way, the image output can be restarted promptly, the screen can be prevented from being disturbed for a long time after the reproduction becomes possible, and the waiting time for the user can be shortened.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in a non-volatile memory, and when the power is turned off and then turned on again, a predetermined still image is generated. While outputting the still image generated by the container, the I picture near the position information is searched based on the position information stored in the memory, and after the search is completed, the I picture and the subsequent I pictures are replaced in place of the still image. Perform playback output. As a result, when the power is once turned off and then turned on again, a still image is immediately output, so that the user does not feel uncomfortable with the distorted screen.
Pictures can be completely decoded with their own data,
The image can be output quickly from the vicinity of the image displayed just before the last power-off last time, and the user does not have to wait for the image to appear.

Further, during reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in the memory, and when reproduction is temporarily disabled, it is generated by a predetermined still image generator. When a still image is output and then reproducible, the I picture near the position information is searched based on the position information stored in the memory, and after the search is completed, the I picture is replaced with the I image. Performs playback output after the picture. As a result, when playback is temporarily disabled due to vibration or the like, a still image is output, so the user does not have to feel discomfort at the distorted screen, and the I-picture is complete with its own data. Since the image can be decoded, the output of the image can be restarted promptly by continuing from the vicinity of the image immediately before the image becomes unreproducible when the image becomes reproducible again, and it is not necessary to irritate and wait until the image appears.

Further, during reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in a non-volatile memory, and when the power is turned off and then turned on again, it is stored in the memory. The sequence immediately after the given position information is searched, and the reproduction is started from the sequence. As a result, one sequence can be played back independently, especially when a storage-type recording medium in which a sequence header is provided for each GOP and which can be played back halfway is targeted immediately after power-on. It is possible to quickly output the image following the image immediately before the power is turned off and prevent the screen from being disturbed for a long time.

Further, during reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in the memory, and when the reproduction is temporarily disabled and then enabled again, the memory is stored in the memory. A sequence immediately after the stored position information is searched, and reproduction is started from the sequence.
As a result, one sequence can be played back independently, and especially when a storage-type recording medium in which a sequence header is provided for each GOP and which can be played back midway, is played back by vibration etc. When the reproduction becomes possible again after being disabled, the image output following the image just before the reproduction becomes impossible can be restarted promptly and the screen can be prevented from being disturbed for a long time.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium and a certain amount of the most recently read compressed image data are stored in a non-volatile memory, and the power is temporarily turned on. When it is turned off and then turned on again, the compressed image data stored in the memory is used to output the initial image, and a search is performed based on the position information stored in the memory to output the saved image. Instead, the reproduction is started after the position stored in the memory of the storage type recording medium. As a result, when the power is turned off and then turned on again, the image of the last part seen immediately before turning off the power last time can be immediately output, and the subsequent images can be output. The screen does not have to be uncomfortable and the image can be output immediately after the power is turned on.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium and a certain amount of compressed image data most recently read are stored in the memory.
When the playback is temporarily disabled and then enabled again, the initial image is output using the compressed image data stored in the memory, and the search is performed based on the position information stored in the memory. Instead of outputting the stored image, reproduction is started after the position stored in the memory of the storage type recording medium. As a result, when playback becomes possible again after being temporarily disabled due to vibration, etc., the image of the last part seen immediately before the playback is disabled immediately is output, and the subsequent images are also output. Therefore, the user does not have to feel any discomfort in the distorted screen, and the desired image can be output immediately after the reproduction becomes possible.

Also, during reproduction, the position information of the picture read out most recently from the storage type recording medium and the I read out most recently.
The compressed image data of pictures and P pictures or the latest decoded image data of I and P pictures is stored in a non-volatile memory, and is stored in the memory when the power is turned off and then turned on again. A search is started based on the position information of a certain most recently read picture to start the reading of the compressed image data, and the compressed image data of the I picture and the P picture stored in the memory or the image data is decoded while appropriately used, Play. As a result, even if the picture searched for when the power is turned off and then turned on again is a P picture or a B picture, it can be immediately decoded using the compressed image data stored in the memory. , After the power is turned on, the image following the image displayed immediately before the power is turned off can be output quickly.

Also, during reproduction, the position information of the latest picture read from the storage type recording medium and the latest I picture read out.
Compressed image data of pictures and P pictures or the latest decoded image data of I pictures and P pictures are stored in the memory, and when the reproduction is temporarily disabled and then enabled again, stored in the memory. Based on the position information of the most recently read picture, the reading of compressed image data is started, and the compressed image data of the I picture and P picture stored in the memory or the most recently decoded I picture and P picture. The image data of the picture is decoded and reproduced while appropriately using it. As a result, even if a picture to be searched is a P picture or a B picture when the picture becomes temporarily reproducible due to vibration or the like and then becomes reproducible again, the compressed image data stored in the memory is used immediately. Since it can be decrypted into
It is possible to quickly output the image that follows the image immediately before becoming unreproducible.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram of a vehicle-mounted video CD player embodying a reproducing method of a storage type recording medium according to a first embodiment of the present invention. In the figure, reference numeral 1 is a video CD capable of time-divisionally recording compressed audio data and compressed image data in a CD-ROM format, and capable of AV reproduction for up to 98 tracks. The image data and music data are MPEG.
It is compressed and recorded by the method of 1. Reference numeral 3 denotes a data reading unit for reading MPEG data in a CD-ROM format from a video CD, and a CD (not shown) for detecting a recording signal by applying a laser beam while rotating the CD.
A reproducing mechanism section, a CD signal processing circuit for demodulating the CD format data from the detected recording signal, and a CD-ROM format MPEG from the CD format data.
It includes a CD-ROM signal processing circuit for demodulating data. The data reading unit 3 is controlled by a controller, which will be described later, to continuously read MPEG data from the video CD 1, search an arbitrary position of the video CD 1, detect a shock caused by vibration, and output a shock detection signal. To do

4 is a CD-ROM format MPEG
Separate the compressed image data and compressed music data from the data,
Further, a demultiplexer for extracting header information, 5 is an MPEG video decoder for inputting compressed image data and decoding the image data according to the MPEG1 system, and 6 is an MPEG video decoder for inputting compressed compressed music data and decoding the music data according to the MPEG1 system. An audio decoder, 7 is a DA converter that DA-converts the image data to create Y, C _r , C _b signals, and 8 is an external display that converts the Y, C _r , C _b signals into NTSC video signals. An NTSC encoder for outputting to a device (not shown), a DA converter 9 for DA converting music data into an analog music signal, and outputting to an external amplifier (not shown), and 10 for inserting a video CD 1 A disc insertion detection unit for detecting the temperature, 11 a loading unit for loading / unloading a video CD, and 12 a temperature regulation A temperature monitoring unit that outputs a temperature abnormality detection signal when the value exceeds a value, 13 is an ACC ON / OFF detection unit that detects ON / OFF of ACC, 14 is an operation unit that performs eject operation, and 15 is during playback, from the video CD 1 A memory (RAM) that stores the latest read header information as picture position information, 16 a main power supply circuit that creates a predetermined DC stabilized power supply from ACC, 17 a main power switch, and 18 a predetermined DC stabilization from a battery power supply It is a sub-power supply circuit that creates a digitalized power supply.

Reference numeral 2A denotes a controller, which controls ON / OFF of a main power source based on a detection input from the disc insertion detection unit 10 and an eject operation on the operation unit 14, and a video CD.
1, the on / off control of the main power supply based on the detection input from the temperature monitor 12 (temperature protection function), the detection from the temperature monitor 12 and the ACC on / off detector 13 Resuming control including search control based on input and shock detection input is performed. Disc insertion detector 8, ACC on /
Off detection unit 13, operation unit 14, main power switch 1
7. The sub power supply is always supplied to the controller 2A, and similarly, the sub power supply is always supplied to the memory 15 and the stored data is backed up by the battery.

2 and 3 are flowcharts showing the operation of the video CD player, and FIG. 4 is an explanatory diagram of the decoding procedure. The operation of the first embodiment will be described below with reference to these figures. It is assumed that the ACC is turned on in advance. When the video CD 1 is inserted into the set, the disc insertion detection unit 10 outputs a disc insertion detection signal to the controller 2A, and the controller 2A closes the main power switch 17 to supply main power to each unit and then controls the loading unit 11. Then, the video CD 1 is loaded (steps 101 to 103 in FIG. 2). Then, each section is made to perform continuous reproduction operation (step 104), and the data reading section 3 starts reading MPEG data from the AV track on the inner peripheral side of the video CD 1. The demultiplexer 4 inputs the MPEG data from the data reading unit 3, takes out each header information such as a sequence header, a GOP header, and a picture header separately for each image and music, and separates the compressed image data and the compressed music data, And MP separately for music
EG video decoder 5 and MPEG audio decoder 6
Output to.

At the time of continuous reproduction, the MPEG video decoder 5 decodes the compressed image data into image data in picture units by using the header information about the image, and the MPEG audio decoder 6 uses the header information about the music to decode the compressed music data. Decodes music data in frame units. Each of the MPEG video decoder 5 and the MPEG audio decoder 6 outputs the decoded image data and music data to the DA converter 7 and the DA converter 9 in synchronization with each other to perform DA conversion. Y outputted from the DA converter 7, C _r, C _b signal is converted into a video signal of the NTSC system in NTSC encoder 8, is output to the external display device. The music signal output from the DA converter 9 is directly output to the external amplifier. During reproduction, the controller 2A constantly inputs the header information regarding the image from the demultiplexer 4,
The picture header relating to the I picture read out latest from the video CD 1, the sequence header and the GOP header containing the I picture are stored in the memory 15, and
The latest header information regarding music is input from the demultiplexer 4 and stored in the memory 15 (steps 105, 1).
06). Time reference and GO in picture header
The position of the I picture is specified by the time code in the P header, and the sequence header, GOP header,
The picture header specifies the decoding condition of the image.
Similarly, the decoding information of music is specified by the header information about music.

In this way, when the driver turns off the ACC to get out of the vehicle while the video CD 1 is being reproduced, the main power supply is turned off and the reproduction of images and music is stopped (step 201 in FIG. 3). ). The header information stored in the memory 15 is saved even when the ACC is off. In addition, ACC
The controller 2A continues to output the switch closing signal to the main power switch 17 even when it is off. After that, when the driver gets on the vehicle again and turns on the ACC, the main power source is turned on and the ACC on / off detection unit 13 turns on the AC.
C-on is detected (step 202). At this time, the controller 2A sends the header information about the image and music stored in the memory 15 to the MPEG video decoder 5 and MPE.
After being given to the G audio decoder 6 so that the compressed image data and the compressed music data can be decoded (step 20)
3) Based on the position information of the I picture read immediately before the ACC was turned off last time, each unit is controlled to search the I picture (step 204).

Specifically, after ACC is turned on, the video CD 1
The GOP header and the picture header read from the current position of the data reading unit 3 and the demultiplexer 4 are input, and compared with the position of the I picture stored in the memory 15 of the optical pickup (not shown). A process of determining the moving direction and the moving amount, performing a track jump to the vicinity of the target I picture position, and again reading the GOP header and the picture header from the current position of the video CD 1 and inputting them is performed. Repeat until it matches the picture. In this way, when the search for the target I-picture is completed, each unit is controlled to cause continuous reproduction after the I-picture (step 205).

Unlike P-pictures and B-pictures, I-pictures can be independently decoded using only their own data. Therefore, after ACC is turned on, images and music can be output quickly from the vicinity of the image immediately before ACC is turned off. After the ACC is turned on, the user does not have to wait a long time until the image output starts. In this respect, simply, video C just before ACC off
The picture position read from D1 is stored, and the AC
When the picture position is searched and reproduced after C is turned on, if the picture is a P picture, the I picture or the data of the I picture and another P picture must be read and decoded in advance. , It takes time to output the P picture of the search target, and the search target is B
The same applies to the case of a picture (see FIG. 4). In addition,
The two B pictures recorded next to the I picture on the video CD 1 cannot be decoded without the decoded data of the last P picture of the immediately preceding GOP, so no image is output.

On the other hand, if vibration occurs during reproduction, reproduction of the video CD 1 is temporarily disabled. When a shock detection signal is input from the data reading unit 3 due to the occurrence of vibration, the controller 2A stops inputting the shock detection signal and reproduction is possible (step 2).
06, 207), the header information about the image and music stored in the memory 15 is transferred to the MPEG video decoder 5 and the MP.
After it is given to the EG audio decoder 6 so that the compressed image data and the compressed music data can be decoded (step 20).
8) Based on the position information of the I picture read immediately before the shock occurrence, each unit is controlled to search for the I picture (step 209). If the search for the target I picture is completed, each unit is searched. Is controlled to cause continuous reproduction of the I picture and thereafter (step 205). This makes it possible to quickly output an image from the vicinity of the image immediately before the image becomes unplayable when the image becomes temporarily unplayable and then can be played again due to the occurrence of vibration. After the user waits, the waiting time is short.

When the temperature exceeds the specified value during reproduction in the summer and the temperature monitor 12 outputs an abnormal temperature detection signal, the controller 2A opens the main power switch 17 to stop the reproduction operation (step 210). , 21
1). After that, when the temperature drops below the specified value and the abnormal temperature detection signal is no longer input, the controller 2A closes the main power switch 17 (steps 212 and 213),
The header information about the image and music stored in the memory 15 is given to the MPEG video decoder 5 and the MPEG audio decoder 6 so that the compressed image data and the compressed music data can be decoded (step 214) and then stored in the memory 15. I read just before the temperature exceeds a specified value
Based on the position information of the picture, each part is controlled to search for the I picture, and when the target I picture is searched, each part is controlled to perform continuous reproduction after the I picture ( Steps 215, 205). As a result, when the temperature returns to the specified value or lower, the image can be output quickly from the vicinity of the image immediately before the temperature becomes abnormal, and the waiting time for the user can be shortened.

FIG. 5 is an overall configuration diagram of an in-vehicle video CD player which embodies the reproducing method for the storage type recording medium according to the second embodiment of the present invention. The same components as those in FIG. It is attached. 19 is an image generator, of which,
Reference numeral 20 denotes a memory (R
OM) and 21 are read-out control units for repeatedly reading out still image data from the memory 20. 22 is the image generator 1
9 is a selector switch for switching between the output of 9 and the output of the MPEG video decoder 5. Controller 2B
During playback, always stores the position information of the latest compressed image data read from the video CD 1 (here, the picture header of the latest read picture and the GOP header including the picture) in the memory 15, and once the ACC When the ACC is turned on again after the power is turned off or the temperature drops below the specified value after the temperature becomes abnormal, first, the changeover switch 22 is switched to the image generator 19 side to output a still image, and the memory is stored. Based on the position information stored in 15, the I picture near the position information is searched, and after the search is completed, the changeover switch 22 is changed over to the MPEG video decoder 5 side to reproduce and output the I picture and thereafter. When the reproduction is temporarily disabled due to vibration, the changeover switch 22 is set to the image generator 19
To output a still image, and when the vibration is subsided and reproduction becomes possible again, the I picture near the position information is searched based on the position information stored in the memory 15, and after the search is completed, the switching is performed. The switch 22 is switched to the MPEG video decoder 5 side to reproduce and output the I-picture and the subsequent pictures. The other components are configured similarly to FIG.

6 and 7 are flow charts showing the operation of the video CD player of the second embodiment, and FIG. 8 is an explanatory view of the reproducing operation. The operation of the second embodiment will be described below with reference to these figures. explain. It is assumed that the ACC is turned on in advance. When the video CD 1 is inserted, the disc insertion detection unit 1
0 outputs a disc insertion detection signal to the controller 2B, and the controller 2B closes the main power supply switch 17 to supply main power to each part, and the changeover switch 2
2 is switched to the image generator 19 side (steps 301 to 303 in FIG. 6). The read controller 21 of the image generator 19 reads the still image data from the memory 20 and outputs it to the DA converter 7 via the changeover switch 22.
Convert to Y, C _r , C _b signals. The Y, C _r , and C _b signals are converted into an NTSC video signal by the NTSC encoder 8 and output. As a result, since a still image is displayed after the video CD 1 is inserted, it is possible to know the normal operation of the set and do not need to irritate and wait until the image appears. After that, the controller 2B moves the loading unit 11
Is controlled to load the video CD 1, and each part is made to continuously reproduce. When the first header information is input from the demultiplexer 4 at the start of the reproducing operation, the changeover switch 22 is changed over to the MPEG video decoder 5 side to display an image based on the compressed image data read from the video CD 1 (step 304). ~ 306).

During reproduction, the controller 2B constantly inputs the header information regarding the image from the demultiplexer 4, and stores the picture header regarding the latest picture read from the video CD 1, the sequence header including the picture and the GOP header in the memory. 15 and also stores the latest header information regarding music from the demultiplexer 4 in the memory 15 (steps 307, 30).
8). Time reference and GOP in picture header
The position of the picture is specified by the time code in the header. GO from the time reference of the picture
Since the picture position in P can be known, the position of the I picture recorded at the beginning of the same GOP as the picture on the video CD 1 can be known.

In this way, when the driver turns off the ACC to get out of the vehicle while the video CD 1 is being played back, the main power source is turned off and the playback of the image and music is stopped (step in FIG. 7). 401). The header information stored in the memory 15 is saved even when the ACC is off. After that, when the driver gets in the vehicle again and turns on the ACC,
When the main power is turned on, the ACC on / off detector 13 detects ACC on (step 402).
At this time, the controller 2B switches the changeover switch 22 to the image generator 19 side to display a still image (step 403). As a result, after ACC is turned on,
Since a still image is displayed immediately, you can understand the normal operation of the set and do not have to irritate and wait until the image appears. After that, the controller 2B gives the MPEG video decoder 5 the header information about the image such as the sequence header stored in the memory 15 so that the images after the I picture can be decoded, and similarly, the header information about the music is sent to the MPEG audio decoder. After the music is given to the decoder 6 to enable decoding of the music (step 404), each part is controlled based on the position information of the picture stored in the memory 15 which is read out immediately before the previous ACC is turned off, and the vicinity of the relevant picture is controlled. I
A picture search is performed (step 405, see FIG. 8).

Specifically, since the I picture is present at the head of the GOP on the video CD 1, the header information stored in the memory 15 is used before the ACC is turned off on the video CD 1 prior to the search. The position of the I picture recorded at the beginning of the GOP including the read picture is obtained, and the GO is read from the current position of the video CD 1 by the data reading unit 3 and the demultiplexer 4.
The P header and the picture header are input, the moving direction and the moving amount of the optical pickup (not shown) are determined by comparing with the previously obtained position with the I picture, and the track jump is performed to near the target I picture position. Let's do it again, video CD
The process of reading and inputting the GOP header and the picture header from the current position of 1 is repeated until the target I picture matches. In this way, when the search for the I picture is completed, the changeover switch 22
Is switched to the MPEG video decoder 5 side (step 406), and each unit is controlled to continuously reproduce the I picture and subsequent ones (step 407).

Unlike the P picture and the B picture, the I picture can be independently decoded only by its own data. Therefore, after the ACC is turned on, the output of the image and the music reproduced from the video CD 1 immediately before the ACC off is output. Can be performed and the video CD1 after the user turns on ACC
There is no need to wait long before the playback of
After ACC is turned on, until the playback of video CD1 begins,
Since the predetermined still image is output, the user does not have to feel discomfort with the disordered screen. Note that the two B pictures recorded after the I picture on the video CD 1 cannot be decoded without the encoded data of the last P picture of the immediately preceding GOP, so no image is output.

On the contrary, if vibration occurs during reproduction, reproduction of the video CD 1 is temporarily disabled (step 408). When a shock detection signal is input from the data reading unit 3 due to the occurrence of vibration, the controller 2B immediately switches the changeover switch 22 to the image generator 19 side to output a still image (step 409). The header information regarding the image such as the sequence header stored in the memory 15 is given to the MPEG video decoder 5 so that the image after the I picture can be decoded, and similarly the header information regarding the music is given to the MPEG audio decoder 6 and the music is given. (Step 410). Then, when the shock detection signal is no longer input and reproduction becomes possible, each unit is controlled based on the position information of the picture stored in the memory 15 and read out immediately before the shock occurs, and the I picture near the picture is detected. Perform a search (steps 411, 412), I
After the picture search is completed, the changeover switch 21 is changed over to the MPEG video decoder 4 side (step 406), and each part is controlled to continuously reproduce the I picture and thereafter (step 407). This makes it possible to quickly output an image from the vicinity of the image immediately before the image becomes unplayable when the image becomes temporarily unplayable and then can be played again due to the occurrence of vibration. After the user waits, the waiting time is short. Further, since the still image is output even while the reproduction is disabled, the user does not have to feel discomfort with the disordered screen.

When the temperature exceeds the specified value during reproduction in the summer and the temperature monitor 12 outputs an abnormal temperature detection signal, the controller 2B opens the main power switch 17 to stop the reproduction operation (step 413). , 41
4). After that, when the temperature falls below the specified value and the abnormal temperature detection signal is no longer input, the controller 2B closes the main power switch 17 (steps 415 and 416),
The selector switch 22 is switched to the image generator 19 side to output a still image (step 417). Then, the header information about the image such as the sequence header stored in the memory 15 is given to the MPEG video decoder 5 so that the images after the I picture can be decoded, and similarly the header information about the music is given to the MPEG audio decoder 6. To enable decoding of music (step 41)
8). Then, each unit is controlled based on the position information of the picture read immediately before the temperature stored in the memory 15 exceeds the specified value to search for an I picture near the picture (step 419), and search for the I picture. After that, the changeover switch 22 is changed over to the MPEG video decoder 5 side, and then each section is controlled to perform continuous reproduction of the I picture and thereafter (steps 406, 4).
07). As a result, when the temperature returns below the specified value,
The image can be output immediately from the vicinity of the image immediately before the temperature becomes abnormal, and the waiting time for the user can be short. In addition, the user does not have to feel uncomfortable with the disordered screen until the temperature of the temperature returns below the specified value and the reproduction of the video CD 1 starts.

FIG. 9 is an overall configuration diagram of a vehicle-mounted video CD player which embodies the reproducing method of the storage type recording medium according to the third embodiment of the present invention. The same components as those in FIG. It is attached. During playback, the controller 2C always stores the position information of the latest compressed image data read from the video CD 1 (here, the picture header of the latest read picture and the GOP header including the picture) in the memory 15, and the ACC is stored. Is turned off, then A
The position information stored in the memory 15 when the CC is turned on again, it becomes possible to play again after being temporarily unplayable due to vibration, or when it falls below the specified value after the temperature becomes abnormal. Based on the above, the sequence immediately after the position information is searched, and after the search is completed, the reproduction output after the sequence is performed. The other components are configured similarly to FIG.

FIGS. 10 and 11 show the video CD of the third embodiment.
FIG. 12 is a flowchart showing the operation of the player, and FIG. 12 is an explanatory diagram of the reproducing operation. The operation of the third embodiment will be described below with reference to these figures. As shown in FIG. 12, it is assumed that the video CD 1 has one sequence composed of one GOP and that the ACC is on. When the video CD 1 is inserted, the controller 2C loads it and then starts continuous reproduction (steps 501 to 504 in FIG. 10). During reproduction, the controller 2C constantly inputs the header information regarding the image from the demultiplexer 4, stores the picture header regarding the latest picture read from the video CD 1 and the GOP header including the picture in the memory 15, and similarly. Then, the latest header information regarding music is input from the demultiplexer 4 and stored in the memory 15 (steps 505 and 506).

In this way, when the driver turns off the ACC to get out of the vehicle while the video CD 1 is being played back, the main power supply is turned off and the playback of images and music is stopped (step in FIG. 10). 601). The header information stored in the memory 15 is saved even when the ACC is off. After that, when the driver gets in the vehicle again and turns on the ACC,
When the main power is turned on, the ACC on / off detector 13 detects ACC on (step 602).
Then, the controller 2C controls each unit to search the sequence immediately after the picture based on the position information of the picture read immediately before the ACC off last time stored in the memory 15 (step 603).

Specifically, after ACC is turned on, the video CD 1
The GOP header and the picture header read from the current position of the data reading unit 3 and the demultiplexer 4 are input and compared with the picture position read immediately before the ACC is turned off on the video CD 1 stored in the memory 15. Then, the moving direction and the moving amount of the optical pickup (not shown) are determined, the track jump is performed to near the target picture position, and the GO is again moved from the current position of the video CD 1.
The process of reading and inputting the P header and the picture header is repeated until it matches the picture read immediately before the ACC is turned off. In this way, when the target picture is searched, the data is continuously read from the video CD 1, and each part is controlled when the sequence start code is input from the demultiplexer 4 in the sequence header at the beginning of the sequence. Then, the continuous reproduction after the sequence is performed (step 604, see FIG. 12). The MPEG video decoder 5 is a demultiplexer 4
The compressed audio data is decoded according to the decoding condition indicated by the header information regarding the image such as the sequence header and the GOP header input from the MPEG audio decoder 6 according to the decoding condition indicated by the header information regarding the music input from the demultiplexer 4. Decrypts.

Since one sequence can be independently decoded only by its own data, in the case of a recording medium in which the video CD 1 is provided with a sequence header for each GOP and can be reproduced halfway, immediately after ACC is turned on and immediately before ACC is turned off. The image and the music reproduced from the video CD1 can be output from the vicinity of the image immediately, and the user does not have to wait long after the ACC is turned on until the reproduction of the video CD1 starts. Note that the two B pictures appearing at the beginning of the GOP immediately after the resumption of reproduction cannot be decoded without the encoded data of the last P picture of the immediately preceding GOP, so no image is output.

On the other hand, if vibration occurs during reproduction, reproduction of the video CD 1 is temporarily disabled. When a shock detection signal is input from the data reading unit 3 due to the occurrence of vibration, the controller 2C stops inputting the shock detection signal and reproduction is possible, and the memory 15
Based on the position information of the picture read immediately before the shock that is stored in, the respective units are controlled to search for the picture, and then the data is continuously read from the video CD 1 and the sequence is performed from the demultiplexer 4. When the sequence start code is input in the first sequence header, each unit is controlled to perform continuous reproduction after the sequence (steps 605 to 607, 60).
4). As a result, in the case where the video CD 1 is a recording medium in which a sequence header is provided for each GOP and is capable of being reproduced midway, when reproduction is temporarily impossible due to the occurrence of vibration and then reproduction becomes possible again, reproduction is impossible. The image can be output immediately near the image immediately before, and the waiting time for the user after the vibration is suppressed and the image can be reproduced can be shortened.

When the temperature exceeds the specified value during reproduction in the summer and the temperature monitoring unit 12 outputs an abnormal temperature detection signal, the controller 2C opens the main power switch 17 to stop the reproduction operation (step 608). , 60
9). After that, when the temperature drops below the specified value and the abnormal temperature detection signal is no longer input, the controller 2C closes the main power switch 17 (steps 610 and 611),
Based on the position information of the picture read immediately before the temperature stored in the memory 15 exceeds a specified value, each unit is controlled to search for the picture, and then the data is read continuously from the video CD 1. When the sequence start code is input from the demultiplexer 4 in the sequence header at the beginning of the sequence, each unit is controlled to perform continuous reproduction after the sequence (step 612,
604). As a result, in the case of the recording medium in which the video CD 1 is provided with a sequence header for each GOP and is capable of being reproduced halfway, when the temperature returns to the specified value or less, image output is performed immediately from the vicinity of the image immediately before the temperature becomes abnormal. It can be done and the user's waiting time is short.

In the case of the embodiment of FIG. 9, the position information of the compressed image data stored in the memory 15 by the controller 2C during reproduction may be used as the GOP header. Since the position of the latest compressed image data read from the video CD 1 is specified by the time code of the GOP header, when the ACC is turned off and then turned on again, first, the memory 1
The GOP header that matches the time code stored in 5 is searched, and while continuously reading the data, when the sequence start code is input from the demultiplexer 4 in the sequence header at the beginning of the sequence, each part is controlled. Then, the continuous reproduction after the sequence may be performed.

FIG. 13 is an overall configuration diagram of a vehicle-mounted video CD player which embodies the reproducing method for the storage type recording medium according to the fourth embodiment of the present invention. The same components as those in FIG. It is attached. Reference numeral 23 is an image generator, of which 24 is a memory (RAM) for storing 1 frame of image data in a writable / readable manner, and is backed up by a battery by a sub power supply. Reference numeral 25 denotes a write / read controller that repeatedly writes the image data decoded by the MPEG video decoder 5 during reproduction and repeatedly reads at a predetermined time. 26 is the image generator 2
3 is a changeover switch for switching between the output of 3 and the output of the MPEG video decoder 5. Controller 2D
Causes the write / read controller 25 to write the latest image data for one frame decoded by the MPEG video decoder 5 into the memory 24 during reproduction. In addition, the position information indicating the latest compressed image data read from the video CD 1 (here, the picture header of the latest read picture and the GOP header including the picture) is stored in the memory 15, and the ACC is turned off once. After being done, A
When CC is turned on again or the temperature drops below the specified value after the temperature becomes abnormal, first select switch 26
Is switched to the side of the image generator 23, and the write / read controller 25 repeatedly outputs the image data stored in the memory 24.

Then, of the GOPs containing the target picture stored in the memory 15, the I picture at the head is searched, the data of the I picture is read out and decoded by the MPEG video decoder 5, and the target picture is I. If it is not a picture or a P picture recorded after the I picture on the video CD 1, the P pictures between the I picture and the target picture are also sequentially read and decoded, and then the MPEG picture decoder is used by using these decoded pictures. 5
Thus, the reproduction of the image after the target picture is started and the reproduction of the music is started by the MPEG audio decoder 6. At this time, the changeover switch 26 is set to MPEG.
Switch to the video decoder 5 side and write /
The read control unit 25 is caused to write the latest one frame of image data decoded by the MPEG video decoder 5 into the memory 24.

When a shock is generated due to vibration and reproduction becomes impossible, the controller 2D switches the changeover switch 26 to the image generator 23 side and repeats the image data stored in the memory 24 in the write / read controller 25. When the output is started and the vibration is stopped and the reproduction is possible, the reproduction of the picture and the subsequent pictures stored in the memory 15 is started, the changeover switch 26 is changed over to the MPEG video decoder 5 side, and the write / read control unit 25 is set to the MPEG video decoder 5 The latest image data for one frame decoded in (3) is written in the memory 24. The other components are configured similarly to FIG.

14 and 15 show the video CD of the fourth embodiment.
It is a flowchart showing the operation of the player, and the operation of the fourth embodiment will be described below with reference to these figures. In advance,
It is assumed that the ACC is turned on, and that the image data has already been written in the memory 24. Video CD
When 1 is inserted, the disc insertion detection unit 10 outputs a disc insertion detection signal to the controller 2D, the controller 2D closes the main power switch 17 to supply main power to each unit, and the changeover switch 26 is set to the image generator 23.
And the write / read control unit 25 is made to repeatedly read the image data from the memory 24 (steps 701 to 703 in FIG. 14). The image data is output to the DA converter 7 through the changeover switch 26 and converted into Y, C _r and C _b signals. Y, C _r , C _b
The signal is converted into an NTSC video signal by the NTSC encoder 8 and output. As a result, since the stored image is displayed after the video CD 1 is inserted, the normal operation of the set can be understood and the user does not have to irritate and wait until the image appears. After this, the controller 2D loads the loading unit 11
Is controlled to load the video CD 1, and each part is made to continuously play back (steps 704 and 705). When the first header information is input from the demultiplexer 4 at the start of the reproducing operation, the changeover switch 26 is changed over to the MPEG video decoder 5 side to display an image based on the compressed image data read from the video CD 1 (step 706). ).

During reproduction, the write / read control unit 25 sequentially rewrites the memory 24 with the image data output from the MPEG video decoder 5 (step 70).
7). Further, the controller 2D constantly inputs the header information regarding the image from the demultiplexer 4, and the video CD
1, a picture header relating to the latest picture read out from No. 1, a sequence header included in the picture, and a GOP
The header is stored in the memory 15, and similarly, header information regarding music is constantly input from the demultiplexer 4 and stored in the memory 15 (steps 708 and 709). The position of the picture is specified by the time reference in the picture header and the time code in the GOP header.
Since the picture position in the GOP can be known from the time reference of the picture, the position of the I picture recorded at the beginning of the GOP on the video CD 1 can be known. Also, the decoding condition of the image is specified by the sequence header, the GOP header, and the picture header. Similarly, the decoding information of music is specified by the header information about music.

In this way, when the driver turns off the ACC to get out of the vehicle while the video CD 1 is being played back, the main power supply is turned off and the playback of the image and music is stopped (step of FIG. 15). 801). The header information stored in the memory 15 is saved even when the ACC is off. After that, when the driver gets in the vehicle again and turns on the ACC,
When the main power source is turned on, the ACC on / off detector 13 detects ACC on (step 802).
At this time, the controller 2D switches the changeover switch 26 to the image generator 23 side, and causes the write / read control 25 to read the image data from the memory 24 and display the stored image (step 803). As a result, since the image is displayed immediately after the ACC is turned on, it is possible to know the normal operation of the set and do not have to irritate and wait until the image appears.

After that, the controller 2D stores the memory 15
MPE the sequence header and GOP header stored in
The compressed image data is given to the G video decoder 5 so that the compressed image data can be decoded. Similarly, the header information about the music stored in the memory 15 is given to the MPEG audio decoder 6 so that the compressed music data can be decoded (step 804).
Then, based on the position information of the picture read immediately before the ACC is turned off, which is stored in the memory 15, each unit is controlled to search the I picture at the head of the GOP including the picture and the data reading unit 3 reads the I picture. The data of the I picture that has been set is sent from the demultiplexer 4 to the MPE.
When the target picture is not an I picture or a P picture recorded following the I picture on the video CD 1, the G picture decoder 5 inputs and decodes the P picture between the I picture and the target picture. After decoding (step 805), the MPEG video decoder 5 starts reproduction of images after the target picture using these decoded pictures, and at the same time, the MPEG audio decoder 6 uses compressed music data after the target picture. Start playing music (step 80)
6). At this time, the selector switch 26 is switched to the MPEG video decoder 5 side, and the write / read controller 26 is made to write the latest image data for one frame decoded by the MPEG video decoder 5 into the memory 24 (step 807, FIG. 14 step 707).

If the picture immediately before the ACC is off is the P picture or the B picture, the other I and P pictures must be decoded in advance in order to decode them, and the reproduction after the target picture starts. It will take time. However, in the present embodiment, after the ACC is turned on, the stored image is displayed using the image data decoded immediately before the ACC is turned off until the reproduction of the target picture is started.
After C is turned on, there is no need to feel uncomfortable with the distorted screen or to wait for an image to appear until the video CD 1 starts to be reproduced, and the image to be started can be known quickly. In addition, on the video CD1 I
When the two B pictures recorded next to the picture are target pictures, decoding is not possible without the decoded data of the last P picture of the immediately preceding GOP, so image output is not performed.

In contrast to this, when vibration occurs during reproduction, reproduction of the video CD 1 is temporarily disabled. When a shock detection signal is input from the data reading unit 3 due to the occurrence of vibration, the controller 2D immediately switches the changeover switch 26 to the image generator 23 side, and the write / read control 25 reads the image data from the memory 24. The stored image is displayed (step 808,
809). Then, the controller 2D supplies the sequence header and GOP header stored in the memory 15 to the MPEG video decoder 5 to enable decoding of the compressed image data, and similarly, the header information relating to the music stored in the memory 15 is stored in the MPEG audio decoder 6 as well. To enable decoding of compressed music data (step 810). Then, when the shock detection signal is no longer input and reproduction becomes possible, each unit is controlled based on the position information of the picture stored in the memory 15 and read out immediately before the shock occurrence, and the GOP head including the picture is started. Of the I picture is read out, and the data of the I picture is read out and decoded by the MPEG video decoder 5.
If the target picture is not an I picture or a P picture recorded following the I picture on the video CD 1, the P pictures between the I picture and the target picture are also read and decoded sequentially (steps 811, 812). , MPEG video decoder 5 using these decoded pictures
Thus, the reproduction of the image after the target picture is started, and at the same time, the reproduction of the music is started by the MPEG audio decoder 6 (step 813). At this time, the changeover switch 26 is changed over to the MPEG video decoder 5 side, and the write / read control unit 25 is made to write the latest image data for one frame decoded by the MPEG video decoder 5 into the memory 24 (step 807, FIG. 14 step 707).

As a result, when the reproduction is reproducible after being temporarily unreproducible due to the occurrence of vibration, it is possible to output the image immediately from the image immediately before the reproduction becomes impossible, and the vibration is relieved. The user's waiting time after becoming is short. In addition, since the saved image based on the image just before the reproduction becomes impossible is output while the reproduction is impossible, the user does not have to feel discomfort on the distorted screen.

When the temperature exceeds the specified value during reproduction in the summer and the temperature monitor 12 outputs an abnormal temperature detection signal, the controller 2D opens the main power switch 17 to stop the reproduction operation (step 814). , 81
5). After that, when the temperature falls below a specified value and the abnormal temperature detection signal is no longer input, the controller 2D closes the main power switch 17, switches the changeover switch 26 to the image generator 23 side, and outputs the saved image ( Steps 816-818). Then, the sequence header and the GOP header stored in the memory 15 are given to the MPEG video decoder 5 so that the compressed image data can be decoded. Similarly, the header information about the music stored in the memory 15 is given to the MPEG audio decoder 6. The compressed music data can be decoded (step 819). Then, each part is controlled based on the position information of the picture read immediately before the temperature stored in the memory 15 exceeds the specified value to search the I picture at the head of the GOP including the picture, and the I picture is searched. Data is read and input to the MPEG video decoder 5 for decoding, and the target picture is an I picture or an I picture on the video CD 1.
If it is not a P-picture recorded after the picture,
After the P pictures between the I picture and the target picture are also sequentially read and decoded (step 820), the MPEG video decoder 5 starts reproduction of images after the target picture using these decoded pictures, and at the same time,
The MPEG audio decoder 6 starts the reproduction of music after the target picture (step 821). At this time, the changeover switch 26 is set to the MPEG video decoder 5
And the write / read controller 2
The latest image data for one frame decoded by the MPEG video decoder 5 is written in the memory 5 in the memory 24 (step 807, step 707 in FIG. 14).

As a result, when the temperature returns below the specified value, the image can be output immediately from the image immediately before the temperature becomes abnormal, and the waiting time for the user can be shortened. In addition, the user does not have to feel uncomfortable with the disordered screen until the temperature of the temperature returns below the specified value and the reproduction of the video CD 1 starts.

The capacity of the memory 24 is increased to increase the MPE
By storing the image data for a few seconds that has been decoded most recently from the G video decoder 5, the stored image generated by the image generator 23 can be used as a moving image when it is output. Further, the memories 15 and 24 may be shared by one memory. Further, a memory is attached to the MPEG audio decoder 6, which is backed up by a sub power supply, and the latest encoded data of one or more pictures input from the demultiplexer 4 is attached to the attached memory together with a picture header, a GOP header, and a sequence header. Remember, A
When CC is turned off and then turned on again, MPEG
After the video decoder 5 starts the decoding and the image data output based on the data stored in the attached memory, the I picture of the same GOP is searched based on the picture position stored in the memory 15 immediately before the ACC is turned off, and the target The coded data of I and P pictures required for picture decoding is read out, and the demultiplexer 4 to the MPEG video decoder 5 are read.
When the input is finished, the decoding after the target picture and the output of the image data may be performed. Similarly, the compressed image data stored in advance in the attached memory can be decrypted in advance even after the main power has been cut off due to the temperature protection function while it is temporarily unplayable due to shock. The stored image may be displayed.

FIG. 16 is an overall configuration diagram of a vehicle-mounted video CD player that embodies the reproducing method for the storage-type recording medium according to the fifth embodiment of the present invention. The same components as those in FIG. It is attached. 27 is an MPEG video decoder 5
It is a memory (RAM) attached to E and is backed up by a battery by a sub power supply. MPEG during playback
The video decoder 5E always stores in the memory 27 the compressed image data of the I picture and the P picture of the GOP read most recently from the video CD 1. Further, during playback, the controller 2E stores, in the memory 15, position information indicating the latest compressed image data read from the video CD 1 (here, the picture header of the latest read picture and the GOP header including the picture). Remember, ACC
When the ACC is turned off, the ACC is turned on again, the shock becomes unplayable, then it becomes playable again, or when the temperature drops below the specified value after the temperature becomes abnormal, it is stored in the memory 15. A certain target picture is searched, and after the search is completed, the data is continuously read from the video CD 1. The MPEG video decoder 5E appropriately decodes the compressed image data input from the demultiplexer 4 while using the data stored in the memory 27, and outputs the image data. The other components are configured similarly to FIG.

17 and 18 are flow charts showing the operation of the fifth embodiment, which will be described below with reference to these figures.
It is assumed that the ACC is turned on in advance. When the video CD 1 is inserted, the disc insertion detection unit 8 outputs a disc insertion detection signal to the controller 2E, and the controller 2E closes the main power switch 17 to supply main power to each unit, and controls the loading unit 11 to control the video CD 1 Is loaded, and each part is made to continuously reproduce (steps 901 to 904 in FIG. 17). During reproduction, the controller 2E constantly inputs the header information regarding the image from the demultiplexer 4, stores the picture header regarding the latest picture read from the video CD 1 and the GOP header including the picture in the memory 15, and similarly. Then, the latest header information regarding music is input from the demultiplexer 4 and stored in the memory 15 (step 90).
5, 906). The position of the picture is specified by the time reference in the picture header and the time code in the GOP header. During playback, the MPEG video decoder 5E always reads the latest G read from the video CD1.
Compressed image data of I picture and P picture of OP, picture header, and GOP including these pictures
The GOP header of the sequence and the sequence header are stored in the memory 27 (step 907). I, P using sequence header, GOP header, and picture header
Pictures can be decoded.

In this way, when the driver turns off the ACC to get out of the vehicle while the video CD 1 is being played back, the main power supply is turned off and the playback of images and music is stopped (step of FIG. 18). 1001). Memory 15,
The data stored in 27 is preserved even while ACC is off.
After that, when the driver gets on the vehicle and turns on the ACC again, the main power source is turned on and the ACC on / off detector 13 detects the ACC on (step 100).
2). At this time, the controller 2E causes the MPEG video decoder 5E to decode the I and P pictures stored in the memory 27 (step 1003), and the position information of the picture stored in the memory 15 immediately before ACC is turned off ( Based on the time code of the GOP header and the time reference of the picture header, each part is controlled to search for the target picture (step 1004), and the compressed image data and compressed music data after the picture are read out and the MPEG video is read. Decoder 5E and MPEG
Input to the audio decoder 6. The MPEG video decoder 5E uses the previously decoded I and P pictures as appropriate to decode the target picture and thereafter, and outputs the image data.
The MPEG audio decoder 6 also decodes and outputs music data after the target picture (step 100).
5). Specifically describing the decoding of the target picture,
If the target picture is an I picture, the decoded I picture is output as it is during the search, and if the target picture is a P picture, it is decoded using the decoded I picture or another P picture during the search When the picture is a B picture, it is decoded using the I picture or P picture that has already been decoded during the search.

Even if the picture immediately before the ACC is off is the P picture or the B picture, it is already stored in the memory 2 when the ACC is on.
7 other I, P needed to decode these pictures
Since the image data of the picture is stored, it is possible to save the time for reading the I, P picture from the video CD 1 after the ACC is turned on, and while the I, P picture is searched immediately before the ACC is turned off. Since the picture has been decoded, after the search is completed, it is possible to immediately decode the pictures immediately before the ACC is turned off.
The reproduction output after the target picture can be started immediately after C is turned on, and the user does not have to irritate and wait until the image comes out after ACC is turned on. When the two B pictures recorded next to the I picture on the video CD 1 are target pictures, decoding cannot be performed without the decoded data of the last P picture of the immediately preceding GOP. Do not output.

On the contrary, if vibration occurs during reproduction, reproduction of the video CD 1 is temporarily disabled (step 1006). When the vibration stops and the shock detection signal is not input from the data reading unit 3, the controller 2E causes the MPEG video decoder 5E to decode the I and P pictures stored in the memory 27 (step 100).
7, 1008), and based on the picture position information stored in the memory 15 and read out immediately before the shock occurs,
The respective units are controlled to search for the target picture (step 1009), and the compressed image data and compressed music data after the picture are read out and input to the MPEG video decoder 5E and the MPEG audio decoder 6. The MPEG video decoder 5E uses the previously decoded I, P
The picture after the target picture is decoded by using the picture as appropriate, and the image data is output. The MPEG audio decoder 6 also decodes and outputs the music data after the target picture (step 1005). This makes it possible to play again after being temporarily unplayable due to vibration.
It is possible to immediately output the image immediately after the image immediately before becoming unreproducible, and the waiting time of the user after the vibration is suppressed and the reproduction becomes possible is completed in a very short time.

When the temperature exceeds the specified value during reproduction in the summer and the temperature monitor 12 outputs an abnormal temperature detection signal, the controller 2E opens the main power switch 17 to stop the reproduction operation (step 1010). , 101
1). After that, when the temperature falls below the specified value and the abnormal temperature detection signal is no longer input, the controller 2E closes the main power switch 17 (steps 1012, 101).
3) The MPEG video decoder 5E is caused to decode the I and P pictures stored in the memory 27 (step 101
4, based on the position information of the picture stored in the memory 15 and read immediately before the temperature abnormality occurs, each unit is controlled to search for the target picture (step 101).
5), the compressed image data and compressed music data after the picture are read out and the MPEG video decoder 5E
To the MPEG audio decoder 6. MPE
The G video decoder 5E decodes the target picture and the subsequent pictures by appropriately using the previously decoded I and P pictures, and outputs the image data. The MPEG audio decoder 6 also decodes and outputs the music data after the target picture (step 1005). As a result, when the temperature returns to the specified value or lower, the image can be immediately output immediately after the image immediately before the temperature becomes abnormal, and the waiting time for the user is extremely short.

Although the I and P pictures before decoding are stored in the memory 27, if the I and P pictures after decoding are stored in the memory 27, the MPEG can be searched during the search of the target picture.
If the video decoder 5E does not have to decode the I and P pictures, and the last decoded P picture of the GOP immediately preceding the GOP including the target picture is also stored, the target picture is the video. Even two B pictures recorded after the I picture on the CD can be decoded.

Further, in each of the above-mentioned embodiments, the video CD is taken as an example of the storage type recording medium, but the present invention can be similarly applied to other types of medium such as a tape and a magnetic disk.

[0066]

As described above, according to the present invention, the position information of the latest I picture read from the storage type recording medium is stored in the non-volatile memory during reproduction, and when the power is turned off and then turned on again. Since the I picture is searched based on the position information stored in the memory and the I picture and subsequent pictures are reproduced, the I picture can be completely decoded only by its own data. When the power is turned off and then turned on again, the image can be output quickly from the vicinity of the last image displayed just before the power was turned off. The user's waiting time is short.

During reproduction, the position information of the latest I picture read from the storage-type recording medium is stored in the memory, and when reproduction is temporarily disabled and then enabled again,
Since the I picture is searched based on the position information stored in the memory and the reproduction after the I picture is restarted, the I picture can be completely decoded only by its own data. When it becomes possible to play again after it becomes temporarily unplayable due to occurrence, it is possible to restart image output quickly by continuing from the vicinity of the image immediately before becoming unplayable, and it becomes possible to play again. After that, the screen can be prevented from being disturbed for a long time, and the waiting time for the user can be shortened.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in the non-volatile memory, and when the power is turned off and then turned on again, a predetermined still image is generated. While outputting the still image generated by the container, the I picture near the position information is searched based on the position information stored in the memory, and after the search is completed, the I picture and the subsequent I pictures are replaced in place of the still image. Since the reproduction output is configured, when the power is turned off and then turned on again, a still image is immediately output, so that the user does not have to feel discomfort on the distorted screen. Since the picture can be completely decoded only with its own data, the image can be output quickly from the vicinity of the last displayed image just before the power was turned off, and the image can be output quickly. It is not necessary to wait Te.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in the memory, and when reproduction is temporarily disabled, it is generated by a predetermined still image generator. When a still image is output and then reproducible, the I picture near the position information is searched based on the position information stored in the memory, and after the search is completed, the I picture is replaced with the I image. Since it is configured to perform playback output after the picture, a still image is output when playback is temporarily disabled due to vibration or the like, so the user does not have to feel discomfort on the distorted screen. , I picture can be completely decoded only by its own data, so when it becomes reproducible again, the image output can be restarted quickly by continuing from the vicinity of the image just before it becomes unreproducible. It is not necessary to wait impatiently to.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in a non-volatile memory, and when the power is turned off and then turned on again, it is stored in the memory. Since the sequence immediately after the certain position information is searched and the reproduction is started from the sequence, one sequence can be reproduced independently, and in particular, the sequence header is set for each GOP. When a storage-type recording medium that is provided and can be played back halfway is targeted, the image output immediately after the power is turned on can be promptly performed following the image immediately before the power is turned off, and the screen can be prevented from being disturbed for a long time.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium is stored in the memory, and when the reproduction is temporarily disabled and then enabled again, the memory is stored in the memory. Since the sequence immediately after the stored position information is searched and the reproduction is started from the sequence, one sequence can be reproduced independently, and in particular, the sequence header for each GOP. In the case of a storage-type recording medium that is reproducible halfway through, if the image becomes unreproducible due to vibration or the like and then reproducible, the image output immediately following the image just before the reproducibility becomes faster It can be restarted and the screen can be prevented from being disturbed for a long time.

During reproduction, the position information of the compressed image data most recently read from the storage type recording medium and a certain amount of the compressed image data most recently read are stored in a non-volatile memory, and the power is temporarily turned on. When it is turned off and then turned on again, the compressed image data stored in the memory is used to output the initial image, and a search is performed based on the position information stored in the memory to output the saved image. Instead, it is configured to start playback from the position stored in the memory of the storage-type recording medium, so when the power is turned off and then on again, the last time it was viewed immediately before the power was turned off. Since it is possible to output the image of the part and the subsequent image, the user does not have to feel any discomfort in the distorted screen, and the image can be output immediately after the power is turned on.

Further, during reproduction, the position information of the latest compressed image data read from the storage type recording medium and a certain amount of latest compressed image data are stored in the memory,
When playback is temporarily disabled and then re-enabled, the compressed image data stored in the memory is used to output the initial image while searching based on the position information stored in the memory. , Instead of outputting the stored image, the reproduction is started after the position stored in the memory of the storage-type recording medium. When it becomes, the image of the last part seen immediately before becoming unplayable can be output immediately and the subsequent images can be output, so that the user does not have to feel any discomfort in the distorted screen. A desired image can be output immediately after reproduction becomes possible.

During reproduction, the position information of the picture most recently read from the storage type recording medium and the most recently read I
The compressed image data of pictures and P pictures or the latest decoded image data of I and P pictures is stored in a non-volatile memory, and is stored in the memory when the power is turned off and then turned on again. A search is started based on the position information of a certain most recently read picture to start the reading of the compressed image data, and the compressed image data of the I picture and the P picture stored in the memory or the image data is decoded while appropriately used, Since the playback is configured, even if the picture to be searched when the power is turned off and then turned on again is a P picture or a B picture, the compressed image data stored in the memory is used immediately. Since the data can be decoded, the image following the image displayed immediately before the previous power-off after the power-on can be quickly output.

During reproduction, the position information of the picture most recently read from the storage type recording medium and the I most recently read.
Compressed image data of pictures and P pictures or the latest decoded image data of I pictures and P pictures are stored in the memory, and when the reproduction is temporarily disabled and then enabled again, stored in the memory. Based on the position information of the most recently read picture, the reading of compressed image data is started, and the compressed image data of the I picture and P picture stored in the memory or the most recently decoded I picture and P picture. Since the image data of the picture is decoded and reproduced while appropriately used, the picture to be searched is a P picture or a B picture when reproduction becomes possible again after the reproduction is temporarily disabled due to vibration or the like. Even if there is, it can be immediately decoded using the compressed image data stored in the memory. Image following immediately before the image that it is possible to quickly output.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a video CD player embodying a reproducing method for a storage-type recording medium according to a first embodiment of the present invention.

FIG. 2 is a first flowchart showing the operation of the first embodiment.

FIG. 3 is a second flowchart showing the operation of the first embodiment.

FIG. 4 is an explanatory diagram of a decoding procedure of I, P, and B pictures.

FIG. 5 is an overall configuration diagram of a video CD player embodying a reproducing method of a storage-type recording medium according to a second embodiment of the present invention.

FIG. 6 is a first flowchart showing the operation of the second embodiment.

FIG. 7 is a second flowchart showing the operation of the second embodiment.

FIG. 8 is an explanatory diagram of a reproducing operation according to the second embodiment.

FIG. 9 is an overall configuration diagram of a video CD player that embodies a reproducing method for a storage-type recording medium according to a third embodiment of the present invention.

FIG. 10 is a first flowchart showing the operation of the third embodiment.

FIG. 11 is a second flowchart showing the operation of the third embodiment.

FIG. 12 is an explanatory diagram of a reproducing operation according to the third embodiment.

FIG. 13 is an overall configuration diagram of a video CD player that embodies a reproducing method for a storage-type recording medium according to a fourth embodiment of the present invention.

FIG. 14 is a first flowchart showing the operation of the fourth embodiment.

FIG. 15 is a second flowchart showing the operation of the fourth embodiment.

FIG. 16 is an overall configuration diagram of a video CD player that embodies a reproducing method for a storage-type recording medium according to a fifth embodiment of the present invention.

FIG. 17 is a first flowchart showing the operation of the fifth embodiment.

FIG. 18 is a second flowchart showing the operation of the fifth embodiment.

FIG. 19 is an explanatory diagram of a hierarchical structure of MPEG video data.

[Fig. 20] Fig. 20 is an explanatory diagram of recording positions on a medium of pictures forming a GOP.

FIG. 21 is a general configuration diagram of a video CD player.

[Explanation of symbols]

 1 Video CD 2A, 2B, 2C, 2D, 2E Controller 3 Data Reading Unit 4 Demultiplexer 5, 5E MPEG Video Decoder 7, 9 DA Converter 12 Temperature Monitoring Unit 13 ACC On / Off Detection Unit 15, 20, 24, 27 Memory 19, 23 Image generator 21 Read control unit 25 Write / read control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G11B 20/18 576 A 8940-5D 27/10 A 8224-5D H04N 7/24 8224-5D G11B 27 / 10 A

Claims (10)

[Claims] 1. A reproducing method for a storage-type recording medium in which compressed image data composed of three types of pictures of I, P, and B is recorded in accordance with the MPEG format, and an I-picture most recently read from the storage-type recording medium during reproduction. Position information is stored in a non-volatile memory, and when the power is turned off and then turned on again, an I picture is searched based on the position information stored in the memory, and the reproduction of the I picture and subsequent pictures is performed. The method of reproducing a storage-type recording medium, characterized in that 2. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B is recorded according to the MPEG format, and an I picture read out most recently from the storage type recording medium during reproduction. The position information of the I picture is stored in the memory, and when the reproduction is temporarily disabled and then re-enabled, the I picture is searched based on the position information stored in the memory, and I tried to restart the playback, 3. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B is recorded according to the MPEG format, and a compressed image read out most recently from the storage type recording medium during reproduction. The position information of the data is stored in the non-volatile memory, and when the power is turned off and then on again, the position stored in the memory is output while outputting the still image generated by the predetermined still image generator. The I-picture near the position information is searched based on the information, and after the search is completed, the reproduction and output of the I-picture and the subsequent pictures are performed instead of the still picture. Method. 4. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B are recorded according to the MPEG format, and a compressed image read out most recently from the storage type recording medium during reproduction. The position information of the data is stored in the memory, and when playback is temporarily disabled, the still image generated by the specified still image generator is output, and when playback is enabled, it is stored in memory. Based on the given position information, an I picture near the position information is searched for, and after the search is completed, reproduction output of the I picture and subsequent pictures is performed instead of the still image. How to play media. 5. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B is recorded according to the MPEG format, and a compressed image read out most recently from the storage type recording medium during reproduction. The position information of the data is stored in the non-volatile memory, and when the power is turned off and then turned on again, the sequence immediately after the position information stored in the memory is searched and the reproduction is started from the sequence. A method of reproducing a storage-type recording medium, characterized in that. 6. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B are recorded according to the MPEG format, and a compressed image read out most recently from the storage type recording medium during reproduction. The position information of the data is stored in the memory, and when the reproduction is temporarily disabled and then re-enabled, the sequence immediately after the position information stored in the memory is searched and the reproduction is performed from the sequence. A reproducing method for a storage-type recording medium, characterized in that it is started. 7. A reproducing method of a storage-type recording medium in which compressed image data composed of three types of pictures of I, P, and B is recorded according to the MPEG format, and a compressed image read out most recently from the storage-type recording medium during reproduction. The data position information and a certain amount of the latest read compressed image data are stored in a non-volatile memory, and when the power is turned off and then turned on again, the compressed image data stored in the memory is stored. While outputting the saved image using, search based on the position information stored in the memory, and start playback after the position stored in the memory of the storage type recording medium instead of outputting the saved image. A method of reproducing a storage-type recording medium, characterized in that. 8. A reproducing method for a storage-type recording medium in which compressed image data composed of three types of pictures of I, P, and B is recorded in accordance with the MPEG format. The position information of the data and a certain amount of the latest read compressed image data are stored in the memory, and when playback is temporarily disabled and then enabled again, the compressed image stored in the memory While outputting the saved image using the data, a search is performed based on the position information stored in the memory, and instead of the output of the saved image, reproduction from the position stored in the memory of the storage-type recording medium is performed. A reproducing method for a storage-type recording medium, characterized in that it is started. 9. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B is recorded in accordance with the MPEG format, wherein a picture read out most recently from the storage type recording medium during reproduction. The position information and the latest read I-picture and P-picture compressed image data or the latest decoded I-picture and P-picture image data are stored in a non-volatile memory, and the power is turned off and then turned on again. Then, the search is started based on the position information of the latest read picture stored in the memory, and the reading of the compressed image data is started.
The compressed image data of the I picture and P picture stored in the memory or the image data is decoded while being appropriately used,
A reproducing method for a storage-type recording medium, characterized in that reproduction is performed. 10. A reproducing method of a storage type recording medium in which compressed image data composed of three types of pictures of I, P and B is recorded in accordance with the MPEG format. The position information and the latest read I-picture and P-picture compressed image data or the latest decoded I-picture and P-picture image data are stored in the memory, and the reproduction is possible again after being temporarily disabled. When, the search is started based on the position information of the most recently read picture stored in the memory to start reading the compressed image data, and the compressed image data of the I picture and P picture stored in the memory. Alternatively, a reproducing method for a storage-type recording medium is characterized in that the image data is appropriately used for decoding and reproduction.