JP3384562B2 - Recording device and recording method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus and a recording / reproducing method, and more particularly to an optical recording / reproducing apparatus and a recording / reproducing method for recording / reproducing a compression-coded video signal.

[0002]

2. Description of the Related Art Since moving image data has a much larger amount of information than still image data, it is very difficult to record / reproduce by real-time processing. Therefore, the digitized image data is compression-encoded to the extent that information deterioration does not occur in the original image and recorded on the recording medium. By compressing and coding the image data, it is possible to lengthen the time during which the image data can be recorded on the recording medium and the time during which the image data can be reproduced from the recording medium.

Image data compression encoding methods include intra-frame (field) encoding for compression encoding within one frame (or field) and frames for compression encoding over several frames (or several fields). There is inter-field (field) coding. The frame will be described below, but the same applies to the field.

Normally, several frames are grouped into one group, and at least one frame of data in the group is subjected to intraframe compression coding processing having a relatively small compression rate (in each group, Frames that are compressed by intraframe coding are called I-frames). Interframe compression coding processing with a relatively high compression rate is performed on the remaining frames of the group. As described above, by combining the intraframe compression encoding process and the interframe compression process, it is possible to suppress the information deterioration relatively and to improve the compression rate.

The compression-encoded data is recorded on the recording medium as follows. First, data that has been compressed within a frame (I frame data) and data that has been subjected to interframe compression coding by forward prediction (P) or bidirectional prediction (B) are arranged in time series, and various codes are added to 1
Data. Then, this data is divided into sectors having a fixed capacity, an address is provided in each sector, and the sector is recorded on the recording medium. When reproducing the image data recorded on the recording medium as described above, the reproduction is performed while recognizing the address of the sector.

[0006]

However, in the above recording / reproducing method, in special reproduction such as high-speed reproduction,
When reproducing only the intra-frame compression coded data, a correspondence table between the sector address and the data written inside the sector is required. This correspondence table must be recorded in an area other than the area in which the compression-coded data is recorded on the recording medium. For example, when recording image data on an optical disc, the sector address of the I frame data is
It was recorded in the management area provided on the inner circumference side of the optical disc (FIG. 11). In addition, the compressed coded data cannot be written during recording, and must be recorded after the compressed coded data is recorded. Therefore, there is a problem that special reproduction cannot be performed if the correspondence table cannot be written due to some influence.

Further, when the image data is compression-encoded and the data is recorded, it is necessary to decompress and decode the data at the time of reproduction. Therefore, it has been proposed to record the decoding programming data used at the time of reproduction at the head of the data (grouping data) having different compression encoding methods (for example, Japanese Patent Laid-Open No. 2-123883). However, in such a conventional method, the information amount of the image data is unknown until the compressed image data is expanded / decoded by the decoder and the code is analyzed. Therefore, when the data transfer rate is different in one recording medium are recorded in a mixed manner, the buffer memory during reproduction is O
Ba flow or or underflow, there is a problem that there are cases where data processing in the decoder is delayed.

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a comparatively large amount of image data, such as intra-frame (or intra-field) encoded data, of compressed and encoded image data. To provide an optical recording / reproducing apparatus and a recording / reproducing method capable of performing special reproduction such as high-speed forward reproduction and high-speed reverse reproduction by selectively reproducing data that can be decoded by a simple procedure. is there. Another object of the present invention is to provide an optical recording / reproducing apparatus and a recording / reproducing method capable of changing the method of selecting data to be reproduced according to a desired reproduction speed.

Another object of the present invention is to provide a recording / reproducing apparatus capable of stably and smoothly decoding image data even when data having different transfer rates are mixedly recorded in one recording medium. It is to provide a recording and reproducing method.

[0010]

A recording apparatus according to the present invention divides video information into a plurality of groups, and a plurality of grouped data by compressing and coding the data of the plurality of groups. Encoding means for generating, each of the plurality of grouped data,
Encoding means including first encoded data compression-encoded according to the intraframe or intrafield compression encoding method and second encoded data compression-encoded according to the interframe or interfield compression encoding method. A sector dividing means for dividing the first encoded data and the second encoded data into a plurality of sectors, and an amount of data included in a specific group of the plurality of groups. There is provided auxiliary information generating means for generating the auxiliary information shown, and formatting means for arranging the auxiliary information in the first sector of the grouped data of the specific group. The recording method of the present invention comprises a step of dividing video information into a plurality of groups and a step of compressing and encoding data of the plurality of groups to generate a plurality of grouped data, wherein the plurality of groups Each of the encoded data includes first encoded data compression-encoded according to the intraframe or intrafield compression encoding method and second encoded data compression-encoded according to the interframe or interfield compression encoding method. And a step of dividing the first coded data and the second coded data into a plurality of sectors, respectively.
De included in the specific group of the plurality of groups
Generating auxiliary information indicating the amount of data, and arranging the auxiliary information in the first sector of the grouped data of the specific group.

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In the grouped image data in which the first and second encoded data are mixed, the auxiliary information indicating the position (sector address or relative distance) of the first encoded data is first encoded. It records by combining with the sector of data. By using this auxiliary information, only the first encoded data is selectively reproduced during special reproduction.

In grouped image data in which encoded data having different transfer rates are mixed, the transfer rate of each group is recorded in a predetermined sector as auxiliary information.
By using this auxiliary information, stable reproduction is performed during reproduction.

When special reproduction is performed on grouped image data in which the first and second encoded data are mixed, the first
The sector address of the encoded data of is stored. The distance between the first coded data of one reproduced group and the first coded data of the next group to be reproduced is predicted based on the stored address. By moving the pickup means based on the predicted distance, only the first encoded data is selectively reproduced.

[0057]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to Examples.

In the following description, the moving picture image data signal is a digital video signal input for each frame or each field, and is compression-encoded by at least two types of encoding methods. For example, in-frame (in-field) encoding for spatial information compression,
Inter-frame (field-to-field) coding for temporal information compression. A typical example is MPEG (Moving Pictu).
re Image Coding Experts Group) An image data signal encoded by a standard encoding method (FIG. 1). As shown in FIG. 1, the encoded image data includes intraframe-encoded I (Intra-Coded) frames and forward prediction interframe-encoded P (Predictive Code).
d) Frames and bi-directionally predictive inter-frame coded B (Bi-directionally Predictive Coded) frames are arranged in a predetermined order. When encoding is performed in field units instead of frames, the fields are I field, P field, and B field, respectively. Although a frame will be described in the following description, the same applies to a field.

(Embodiment 1) FIG. 2 schematically shows an arrangement of image data 100 recorded on a recording medium according to the first embodiment of the present invention. The digital image data compression-encoded as described above is recorded for each group. The recording medium is, for example, an optical disc. 1
One group includes one I-frame data and corresponding P-frame and B-frame data.
The corresponding P frame and B frame data refer to P and B frame data arranged between the I frame and the next I frame. The I, P, and B frame data are divided into sectors and recorded. In FIG. 2, each group includes n sectors (for example, sectors a _{1 to} a _n ). Several sectors 201 (eg, sectors a _{1 to} a ₃ ) arranged first in each group
I-frame data is placed in the
2 (e.g., sector a ₄ ~a _n) To be arranged data P and B frames. Each sector of I frame data is composed of its own sector address, auxiliary information 203, and compression encoded data.

The auxiliary information may be one or more. Further, the auxiliary information 203 can be arranged in each sector of the I frame as described above, but may be arranged only in the head sector of the I frame, or in the head sector and the tail sector of the I frame.

The auxiliary information 203 includes the following elements.

(1) An identifier indicating that the data recorded in the sector is intraframe compression-encoded data, (2) Address of the first sector of the I frame of the group m units before the group including the sector , And / or the address of the first sector of an I frame that is m behind the group in which the sector is included.

For example, as shown in FIG. 2, auxiliary information 203 is recorded at a predetermined location of a sector c ₁ of I frame data of one group, and the auxiliary information 203 includes identifiers I and m (in the figure, m = 2) The address of the _first sector a ₁ of the I frame of the preceding group (indicated by the same a _{1 as the} sector name) and the address (e _{1 of the first} sector e ₁ of the I frame of the group that is m behind) ) And are included.

The order of recording the above (1) and (2) may be changed.

The auxiliary information 203 may have the following elements instead of the above (2). (3) The distance to the leading sector of the I frame of the group m number of groups before the group including the sector, and / or the distance to the leading sector of the I frame number m behind the group of the sector.

The distance is the difference between the address of the sector and the address of the first sector of the I frame of the group m frames before the loop including the sector, or the address of the sector and the loop including the sector. It may be the difference from the address of the first sector of the I frame of the group after m.

FIG. 3 is a block diagram showing a recording apparatus 200 of the present invention for recording the above-mentioned image data. The recording apparatus 200 includes an analog / digital converter 1, a group divider 2 that divides digital image data into groups including a plurality of frames, an encoder 3, and a sector divider 4 that divides the encoded image data into sectors. An auxiliary information generator 5 for generating the above-mentioned auxiliary information, and a mixer (formatter) 6 for combining the auxiliary information with a predetermined sector and arranging each sector to generate output data.

The group divider 2 groups the input image data (serial data) into a plurality of frames to generate first grouped data. The encoder 3 performs compression coding for each group of the first grouped data, generates an I frame (first coded data) using the intraframe compression coding method, and forward and bidirectionally. P and B frames (second encoded data) are generated using the interframe compression encoding method. Either one of the forward and bidirectional interframe compression coding methods may be used. The sector divider 4 divides the I, P, and B frames into predetermined sectors and outputs them to the mixer 6. The auxiliary information generator 5 indicates the indicator I indicating that it is an I frame.
And auxiliary information indicating the position or relative distance of the I frames of the groups before and / or after the m groups. The generated auxiliary information is given to the mixer 6. The mixer 6 combines the auxiliary information with a predetermined position of at least one sector of the I frame data divided into sectors,
The I, P, and B frame data sectors are arranged in a predetermined order to generate grouped data 100 to be recorded.

Here, the information on the relative distance of I frames belonging to different groups is, for example, arranged at the addresses of the first sector and the last sector of the I frame data of one group and m units before this group. Difference from the address of the start sector of the I frame data in the group to be processed, or the addresses of the start sector and the end sector of the I frame data in one group, and the I frame data in the group arranged m after this one group. It can be used as a difference from the address of the first sector of the above, and these can be used in combination as necessary. Number of jumping groups m (m is a natural number)
Can be selected according to the speed of special playback (high-speed playback). By recording the information corresponding to multiple m,
It can support high-speed playback at different speeds.

(Embodiment 2) FIG. 4 is a block diagram showing an outline of an information reproducing apparatus 300 according to a second embodiment of the present invention. The information reproducing apparatus 300 is the information recording apparatus 20 described above.
By 0, compression-encoded video information (image data) recorded on a recording medium such as an optical disk is reproduced. In the following description, the recording medium will be described as an optical disc. It may be another type of recording medium (such as a magnetic recording medium). Incidentally, the reproducing apparatus 300 according to the present embodiment.
Corresponds to the case where the auxiliary information of (1) and (2) described in the first embodiment is recorded.

The information reproducing apparatus 300 includes an optical pickup device 12 for taking out video information recorded on the recording medium 11,
An optical pickup drive circuit 17 for moving the optical pickup device 12, and a signal reproduction circuit 1 for receiving video information from the optical pickup device 12 and converting the video signal into a reproduction signal.
3. Auxiliary information extractor 1 for extracting the auxiliary information signal of the sector of the I frame data in each group from the reproduced signal
4, a buffer 15, a decoding circuit 16 for decoding a reproduction signal and converting it into an output signal, and a control circuit 18 for controlling the optical pickup driving circuit 17 based on the auxiliary information signal.

The signal reproduction circuit 13 receives the image data signal from the optical pickup device 12, and performs processing such as binarization, digital demodulation, and error correction. Signal reproduction circuit 1
The image data output from 3 is sent to the auxiliary information extractor 14 and the buffer 15. The auxiliary information extractor 14 extracts the auxiliary information described in the first embodiment and outputs the auxiliary information signal to the buffer 15 and the control circuit 18. Control circuit 18
Controls the optical pickup drive circuit 17 based on the auxiliary information signal. The control circuit 18 can be provided separately as shown in FIG.
It is also possible to provide the inside of 7. The decoder 16
The output of the buffer 15 is received, the image data that has been compressed and encoded is decompressed and decoded, and the image data to be displayed is output.

During special reproduction such as high-speed reproduction, only I frame data is continuously reproduced as follows. By using the auxiliary information of one group extracted by the auxiliary information extractor 14, it is possible to obtain, for example, the address of the first sector of the I frame data (belonging to the group m apart) to be reproduced next. The control circuit 18 controls the optical pickup drive circuit 17 to cause the optical pickup device 12 (reproducing head: not shown) to make a track jump to the obtained address.
As a result, the reproducing head reaches the head sector of the I frame data to be reproduced next, and reproduces the image information from the sector of the I frame data. In this I frame data,
Since the address information of the head sector of the I-frame data to be reproduced next is included, the reproducing head jumps to the next address. By repeating the above operation, only I frame data can be reproduced.

The address of the leading sector can be appropriately selected according to the speed of high speed reproduction. When special reproduction is performed at a very high speed, the number m of groups to be track-jumped may be set large. Furthermore, it is possible to record sector address information corresponding to a plurality of values of m and set a plurality of special reproduction modes.

Special reproduction can also be performed by using only the identifier I indicating that the sector is I frame data as the auxiliary information. However, in that case, the I-frames of all groups are reproduced, so that the speed of special reproduction is limited.

In order to use the recording medium more efficiently, the type of image data to be recorded / reproduced (for example, a moving image such as a drama or a sports program or a moving image such as a news program) is used. Accordingly, the compression rate of the image data may be different. In such a case, by recording the sector address of the I frame to be reproduced next, it is possible to perform effective special reproduction according to the compression rate.

(Third Embodiment) FIG. 5 is a block diagram showing the outline of an information reproducing apparatus 400 according to the third embodiment of the present invention. The information reproducing apparatus 400 is the information recording apparatus 20 described above.
By 0, compression-encoded video information (image data) recorded on a recording medium such as an optical disk is reproduced. In the following description, the recording medium will be described as an optical disc. It may be another type of recording medium (such as a magnetic recording medium). The reproducing apparatus 400 according to the present embodiment
Indicates that the auxiliary information (1) and (3) described in the first embodiment is recorded.

The information reproducing apparatus 400 includes an optical pickup device 22 for taking out the video information recorded on the recording medium 21,
An optical pickup drive circuit 25 for moving the optical pickup device 22 and a signal reproduction circuit 2 for receiving video information from the optical pickup device 22 and converting the video signal into a reproduction signal.
3. Auxiliary information extractor 2 for extracting the auxiliary information signal of the sector of the I frame data in each group from the reproduced signal
4, a decoding circuit 26 for decoding the reproduction signal and converting it into an output signal, and a control circuit 27 for controlling the optical pickup driving circuit 25 based on the auxiliary information signal.

The signal reproduction circuit 23 receives the image data signal from the optical pickup device 22 and performs processing such as binarization, digital demodulation, and error correction. Signal reproduction circuit 2
The image data output from 3 is sent to the auxiliary information extractor 24. The auxiliary information extractor 24 extracts the auxiliary information (distance information) described in the first embodiment and outputs the auxiliary information signal to the control circuit 27. The control circuit 27 controls the optical pickup drive circuit 25 based on the auxiliary information signal. The control circuit 27 can be provided separately as shown in FIG. 5, or can be provided inside the optical pickup drive circuit 25. The decoder 26 receives the output of the signal reproduction circuit 23, decompresses and decodes the compression-encoded image data, and outputs the image data to be displayed.

During special reproduction such as high-speed reproduction, only I frame data is continuously reproduced as follows. The auxiliary information extractor 24 extracts distance information from the auxiliary information recorded at a predetermined position of the sector in which the I frame is recorded to the I frame of the group m behind the group. With this distance information, it is possible to obtain the distance at which the reproducing head should make a track jump in order to reach the I frame to be reproduced next. This distance can be, for example, the difference between the address of the head sector or the tail sector of one I frame and the head address of the I frame to be reproduced next. Control circuit 2
7, the optical pickup drive circuit 25 is controlled to drive the optical pickup device 22 (the reproducing head thereof: not shown),
Make the track jump the obtained distance. As a result, the reproducing head reaches the head sector of the I frame data to be reproduced next, and reproduces the image information from the sector of the I frame data. Since this I frame data includes distance information to the I frame data to be reproduced next, the reproducing head jumps to the next I frame data. By repeating the above operation, only I frame data can be reproduced. The track jump distance may be a little shorter than the distance information extracted by the auxiliary information extractor.
This is to prevent the reproducing head from jumping too much.

The magnitude of the track jump distance can be appropriately selected according to the speed of high speed reproduction.
If special playback is performed at a very high speed, the distance may be set so as to jump a number of blocks. Furthermore, it is possible to record a plurality of distance information and set a plurality of special reproduction modes. As in the case of the second embodiment, effective special reproduction can be performed according to the type and compression rate of image data.

Further, by using the distance as the auxiliary information, the optical pickup drive circuit can be directly controlled without calculating the address.

(Embodiment 4) FIG. 6 schematically shows an arrangement of image data 500 recorded on a recording medium according to a fourth embodiment of the present invention. The configuration of the image data 500 is the same as the image data 100 described in the first embodiment, except for the contents of the auxiliary information 204. In the first embodiment, the auxiliary information 203 includes (1) an identifier I indicating that the data recorded in the sector is intraframe compression-encoded data (I frame), and (2) an I frame to be reproduced next. Address or (3) distance information to the next I frame to be reproduced.

In this embodiment, the auxiliary information 204 is
As can be seen from FIG. 6, instead of the above (2) or (3), (4) the transfer rate of the image data of each group is recorded. The inclusion of the above (1) identifier I is similar to the auxiliary information 203. The auxiliary information 204 is recorded in each sector of the I frame. Alternatively, it may be recorded only in the first sector of the I frame.

In this embodiment, the transfer rate is the transfer rate of the group including the auxiliary information, but it may be a value obtained by averaging the transfer rates of a plurality of groups. Moreover, the auxiliary information may be one or more.
The order of recording (1) and (4) may be exchanged.

The image data 500 can be recorded in the same manner as in the first embodiment by changing the auxiliary information 203 generated by the auxiliary information generator 5 into auxiliary information 204 in the recording apparatus 200 shown in FIG. Yes (detailed description is omitted).

FIG. 7 is a block diagram showing the outline of an information reproducing apparatus 600 according to the fourth embodiment of the present invention. The information reproducing device 600 reproduces the image data 500 recorded on a recording medium such as an optical disc.

The information reproducing apparatus 600 comprises an optical pickup device 32 for taking out the video information recorded on the recording medium 31,
A signal reproduction circuit 33 that receives video information from the optical pickup device 32 and converts the video signal into a reproduction signal, an auxiliary information extractor 35 that extracts an auxiliary information signal of a sector of I frame data in each group from the reproduction signal, and a memory 3.
4 and a decoding circuit 36 for decoding the reproduced signal and converting it into an output signal.

The signal reproduction circuit 33 receives the image data signal from the optical pickup device 32, and performs processing such as binarization, digital demodulation, and error correction. Signal reproduction circuit 3
The image data output from 3 is sent to the auxiliary information extractor 35 and the memory 34. The auxiliary information extractor 35 extracts the above-mentioned auxiliary information (transfer rate) and outputs an auxiliary information signal to the memory 34. Based on the auxiliary information signal, the input and output of the memory 34 are controlled according to the transfer rate. The decoder 36 receives the output of the memory 34, decompresses and decodes the compression-coded image data, and outputs the image data to be displayed.

The reproducing apparatus 600 of this embodiment may further be provided with an optical pickup drive circuit for moving the pickup device 32, and may be used in combination with the above-mentioned embodiments. It is also possible to indicate not the transfer rate but the amount of information included in the group.

As described above, by using the transfer rate as the auxiliary information, even when data having different transfer rates are mixedly recorded on one recording medium, the image data can be stably and smoothly decoded. You can do it.

(Embodiment 5) In the present embodiment, by predicting the distance from the I frame data of one group to the I frames of the m distant groups, only the I frame data is reproduced in the special reproduction. A reproducing apparatus and a reproducing method will be described.

FIG. 8 is a block diagram showing the outline of an information reproducing apparatus 700 according to the fifth embodiment of the present invention. The reproducing apparatus 700 reproduces the compression-encoded video information (image data 800 shown in FIG. 10) recorded on a recording medium such as an optical disc. In the following description, the recording medium will be described as an optical disc. It may be another type of recording medium (such as a magnetic recording medium).

The information reproducing apparatus 700 includes an optical pickup device 42 for taking out the video information recorded on the recording medium 41.
An optical pickup drive circuit 47 for moving the optical pickup device 42, and a signal reproduction circuit 4 for receiving video information from the optical pickup device 42 and converting the video signal into a reproduction signal.
3, an address storage circuit 44, a distance predictor 45, a decoding circuit 46 for decoding a reproduction signal and converting it into an output signal, and a control circuit 48 for controlling the optical pickup drive circuit 47 based on the distance information signal. .

The signal reproduction circuit 43 receives the image data signal from the optical pickup device 42 and performs processing such as binarization, digital demodulation, and error correction. Signal reproduction circuit 4
The image data output from No. 3 is the address storage circuit 44.
To the decoding circuit 46. Address storage circuit 44
Stores the addresses of a series of sectors in which I frames of each group are recorded. The address stored in the address storage circuit 44 is output as address information and given to the distance predictor 45. The distance predictor 45 predicts the distance to the I frame of the group to be reproduced next based on the address information, and supplies the predicted distance to the control circuit 48 as a distance information signal. The control circuit 48 controls the optical pickup drive circuit 47 based on the distance information signal. The control circuit 48 can be provided separately as shown in FIG. 8 or can be provided inside the optical pickup drive circuit 47. The decoder 46 receives the output of the signal reproducing circuit 43, expands and decodes the compression-coded image data, and outputs the image data to be displayed.

During special reproduction such as high-speed reproduction, only I frame data is continuously reproduced as follows.

As shown in FIG. 9, the address storage circuit 44 includes an address extractor 441 and a memory 442,
The distance predictor 45 includes an address calculator 451.

The address extractor 441 is used by the signal reproduction circuit 4
From the image data given from No. 3, the sector address of the I frame of each group is extracted. The extracted address is stored in the memory 422, and the necessary address is sent to the address calculator 451.

For example, as shown in FIG.
The address storage circuit 4 stores the address of the _first sector c ₁ of the I frame of one group (c) and the address of the last sector b ₃ of the I frame of the immediately preceding group (b).
4 (memory 442). Address storage circuit 4
4 outputs the stored address to the distance predictor 45.

The distance predictor 45 includes an address storage circuit 44.
Using the address information given by c₁From sector
b₃Calculate the distance x1 to the sector. Of group (c)
Sector c₁To c₃I-frame data stored up to
After being reproduced, the distance predictor 45 uses the distance x1 as
The distance to the start address of the I frame to be reproduced next
It makes a prediction and gives a distance information signal to the control circuit 48. Control times
The path 48 controls the optical pickup drive circuit 47 to control the optical pickup.
Predicting the backup device 42 (playback head of the playback device: not shown)
The track is made to jump the specified distance. This allows
The playback head is the first group of the I frame of the next group (d).
Kuta d₁Jump to sector d₁To d ₃Is played up
Be done.

Next, the address storage circuit 44 stores the address of the d ₁ sector and the address of the c ₃ sector reproduced before that, and outputs the stored address to the distance predictor 45. The distance predictor 45 uses the address information from the address storage circuit 44 to calculate the distance x2 from the d ₁ sector to the c ₃ sector. Sectors d ₁ to d of group (d)
_After the I-frame data stored up to ₃ is played back,
The distance predictor 45 predicts the distance to the start address of the I frame to be reproduced next, using the distance x2. The predicted result is given to the control circuit 48 as a distance information signal. The control circuit 48 controls the optical pickup drive circuit 47 to cause the reproducing head of the optical pickup device 42 to make a track jump by a predicted distance. As a result, the reproducing head jumps to the _first sector e ₁ of the I frame of the next group (e), and the sectors e ₁ to e ₃ are reproduced.

Similarly, the distance predictor 45 calculates the distance x3 from the e ₁ sector to the d ₃ sector based on the address of the e ₁ sector and the address of the d ₃ sector stored in the address storage circuit 44. . After the I frames recorded in the sectors e ₁ to e ₃ of the group (e) are reproduced, the distance x3
The optical pickup device 42 is track-jumped by the distance predicted by using, and the I frame data recorded in the sectors f ₁ to f _{3 of} the next group (f) is reproduced. By repeating the above operation, it is possible to reproduce only the I frame data during special reproduction.

In the above description, the distance is predicted using the address of the first sector and the address of the last sector of I frame data of adjacent groups.
You may use the sector address of the I frame data in the groups separated by several. By appropriately selecting the address of the sector to be stored in the address storage circuit according to the speed of special reproduction, it is possible to reproduce the I frame efficiently.

Next, another method for continuously reproducing only I frame data during special reproduction will be described.

In this method, the address storage circuit 4
4 is the address of the _first sector c ₁ of the I frame of one group (c) and the group (a) two groups before it.
And the address of the last sector a ₃ of the I frame of the I frame is stored in the memory 442. The address storage circuit 44 outputs the stored address to the distance predictor 45.

The distance predictor 45 includes an address storage circuit 44.
The distance x4 from the c ₁ sector to the a ₃ sector is calculated using the address information given by ( ₁ ) (see FIG. 10). After the I frame data stored in the sectors c ₁ to c _{3 of the} group (c) are reproduced, the distance predictor 45 uses the distance x4 to measure the distance to the start address of the next I frame to be reproduced. And the distance information signal is given to the control circuit 48. The control circuit 48 uses the optical pickup drive circuit 47.
Is controlled to cause the optical pickup device 42 (reproducing head thereof: not shown) to perform a track jump by a predicted distance (x4). As a result, the reproducing head jumps to the _first sector e ₁ of the I frame of the group (e), which is one distance away,
Sectors e ₁ to e ₃ are reproduced. Hereinafter, similar to the above case, by repeating this operation, it is possible to reproduce only the I frame data during the special reproduction.
In this case, the I frame data of every other group is reproduced.

As described above, by using the address of the first sector of the I frame of a certain group and the address of the last sector of the I frame of the group m (m: natural number) number before that group, the I sector of the certain group is used. It is possible to predict the distance from the last sector of the frame to the first sector of the I frame data of the group that is m behind. Therefore, it is possible to reproduce the I frame data of several groups.

According to the reproducing apparatus 700 and the reproducing method according to the present embodiment, the image data recorded on the recording medium provides the auxiliary information by providing the address storage circuit for storing the sector address of the I frame data and the distance predictor. Even if the special frame is not provided, only the I frame data can be reproduced during the special reproduction. Further, the group in which the I frame data should be reproduced can be selected according to the reproduction speed of the special reproduction.

[0109]

According to the present invention, of compression-encoded image data, data that can be decoded by a relatively simple procedure, such as intra-frame (or intra-field) encoded data, is selectively reproduced. As a result, it is possible to provide an optical recording / reproducing apparatus and a recording / reproducing method capable of performing special reproduction such as high-speed forward reproduction and high-speed reverse reproduction. Further, it is possible to provide an optical recording / reproducing apparatus and a recording / reproducing method capable of changing the method of selecting data to be reproduced according to a desired reproduction speed.

According to the present invention, a recording / reproducing apparatus and a recording / reproducing method capable of stably and smoothly decoding image data even when data having different transfer rates are mixedly recorded in one recording medium. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing an image data signal encoded by an MPEG standard encoding method.

FIG. 2 is a diagram showing a sector arrangement of image data recorded on a recording medium and contents of auxiliary information according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing an information recording apparatus according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing an information reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing an information reproducing apparatus according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a sector arrangement of image data recorded on a recording medium and contents of auxiliary information according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram showing an information reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 8 is a block diagram showing an information reproducing apparatus according to a fifth embodiment of the present invention.

9 is a diagram showing the address storage circuit and the distance predictor shown in FIG. 8 in more detail.

FIG. 10 is a diagram showing a sector array of image data and a distance between sectors used in a fifth embodiment of the present invention.

FIG. 11 is a diagram showing a conventional method of recording a sector address of I frame data.

[Explanation of symbols]

11 optical disc 12 Optical pickup device 13 Signal reproduction circuit 14 Auxiliary information extractor 15 buffers 16 Decoder 17 Optical pickup drive circuit 18 Control circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-325553 (JP, A) JP-A-7-212768 (JP, A) JP-A-4-38679 (JP, A) JP-A-6- 164522 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 20 / 10,20 / 12,27 / 10

Claims (2)

(57) [Claims] 1. A group dividing means for dividing video information into a plurality of groups, and an encoding means for generating a plurality of grouped data by compression-encoding the data of the plurality of groups, wherein Each of the grouped data of the above is encoded by a first encoded data that is compression-encoded according to an intra-frame or intra-field compression encoding method and a second encoding that is compression-encoded by an inter-frame or inter-field compression encoding method. Encoding means including data; sector dividing means for respectively dividing the first encoded data and the second encoded data into a plurality of sectors; and a specific group of the plurality of groups. De
A recording device, comprising: auxiliary information generating means for generating auxiliary information indicating the amount of data, and formatting means for arranging the auxiliary information in the first sector of the grouped data of the specific group. 2. A step of dividing video information into a plurality of groups, and a step of generating a plurality of grouped data by compressing and encoding the data of the plurality of groups, the plurality of grouped data Each of the first encoded data that is compression-encoded according to the intra-frame or intra-field compression encoding method and the second encoded data that is compression-encoded according to the inter-frame or inter-field compression encoding method.
And a coded data, de-contained steps and, the first encoded data and second encoded data dividing into a plurality of sectors each, a specific group of the plurality of groups
A recording method, comprising: generating auxiliary information indicating an amount of data, and arranging the auxiliary information in a head sector of grouped data of the specific group.