JPH06339113A - Moving picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a moving picture recording and reproducing device capable of copeing with in-frame prediction coding and inter-frame prediction coding and capable of high speed reproduction. CONSTITUTION:The device is provided with a 1st coder 11 coding moving picture data into a predetermined data quantity at high efficiency, a 2nd coder 12 coding the moving picture data with data quantity different from data quantity coded by the 1st coder, and FIFO buffers 14, 15 connecting to the 1st and 2nd coders and recording data outputted from the 1st coder 11 and data outputted from the 2nd coder 12 to a predetermined recording position in time division processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture recording / reproducing apparatus for recording and reproducing digital moving picture data.

[0002]

2. Description of the Related Art Generally, as a moving image recording / reproducing apparatus for recording and reproducing digital moving image data,
Disk read only memory (CD-ROM)
There are known a digital video disk reproducing device using a DVD, a digital video disk recording / reproducing device using a magneto-optical disk, a tape media storage / reproducing device using a tape media such as a digital video tape recorder (VTR). .

When digital moving image data is digitally recorded on a disk medium (media) such as a magnetic disk or an optical disc or a tape medium (media) such as a magnetic tape, the image data is visually encoded by highly efficient coding. The amount of data to be recorded can be reduced without impairing the image quality.

If the amount of data to be recorded by using the high efficiency encoding is reduced, the recording can be performed for a longer time as compared with the case where the high efficiency encoding is not used, and the use of a medium having a slow data reading speed or writing speed. Will be possible.

Generally, as a method for highly efficiently encoding image data, it is temporally continuous with an intraframe encoding method or an intrafield encoding method that removes spatial redundancy in the data of one screen. 1 using multiple image data
Two types are known: an interframe coding method or an interfield coding method that removes spatial redundancy and temporal redundancy in screen data.

Here, the frame means one screen, and the field means a frame selected line by line and divided into two screens. The difference between intra-frame coding and intra-field coding, and inter-frame coding and inter-field coding is only that the unit used for coding is a frame or a field, and the operation used for coding is different. Absent.

The intraframe coding method and the interframe coding method will be described below.

As a conventional intra-frame coding method, for example, there is the "image data coding method" described in Japanese Patent Application No. 3-118825 by Akagi and Katata. This method divides input data into square blocks of 8 pixels × 8 pixels, and discrete cosine transform (hereinafter abbreviated as DCT) for each block.
After that, in order to make the data amount constant, the number of bits to be allocated in block units is calculated in advance over a certain range (for example, 1 frame), and the average of the values obtained by extracting the conversion coefficient for each frequency component over the certain range, Calculate the variance. Then, by using these values which are the additional information, it is determined how many bits the value of each transform coefficient in the block is quantized.

As a conventional interframe coding method, for example, "MPEG2 interframe prediction method" (TV
Society Technical Report, VOL16, No61, pp37-42) and "MPEG2 Quantization and Coding Control" (TV Society Technical Report, V
OL16, No61, pp43-48).

FIG. 17 shows the classification of images and the arrangement of coded data according to the conventional interframe coding method.

In the method shown in FIG. 17, 12 frames or 1
Group of units such as 5 frames
It is called a picture (Group Of Pictures, hereinafter abbreviated as GOP), and one frame of the GOP is an intra picture (Intra Picture).
e, hereinafter abbreviated as I-picture), and intra-frame coding is performed. Predictive pictures (hereinafter referred to as P-pictures) are used for frames at regular intervals such as every three frames between I-pictures.
(Abbreviated as picture). In the P-picture, a case of performing interframe predictive coding and a case of performing intraframe coding using a past I-picture or P-picture as a reference image are adaptively switched and used for each macroblock.

Here, the macroblock is a unit obtained by finely dividing a frame, and the interframe predictive coding is coding the difference between the reference image and the target image. Further, the frames in between are bidirectional pictures (Bidirectional Picts).
ure, hereinafter abbreviated as B-picture), intraframe coding, pre-post interframe predictive coding, and bidirectional interframe predictive coding are adaptively used for each macroblock.

The preceding inter-frame predictive coding uses a past I-picture or P-picture as a reference image, and the subsequent inter-frame predictive coding uses a future I-picture or P-picture as a reference image, in both directions. The inter-frame predictive coding uses two past and future I-pictures and P-pictures as reference images. Furthermore, in the case of these inter-frame predictive coding, front / rear inter-frame predictive coding, and bidirectional inter-frame predictive coding, since motion compensation can be used, more efficient coding is possible.

Here, the motion compensation is to obtain a motion vector between the reference image and the contrast image, and shift the reference image by the vector to obtain the inter-frame difference.

In the example shown in FIG. 17, bidirectional prediction is used. Therefore, the input data order and the output encoded data order are different. For example, to encode a B-picture, decoded images of two I-pictures and P-pictures before and after are required, so that the I-picture and P-picture before and after are encoded and decoded, and then, Encode a B-picture. In addition, the encoded data amount is I-picture, P-picture,
It decreases in the order of B-pictures.

Generally, in the interframe coding method and the interfield coding method, temporal redundancy can be deleted in addition to spatial redundancy, and as a result, if the image quality is the same, the interframe coding method is used. And the intra-field coding method,
The amount of data after encoding can be reduced.

[0017]

However, in the above-mentioned conventional method, when high-efficiency-coded data is reproduced at high speed, less data can be read out than in normal reproduction, and continuous data can be read out. Not fragmentary data. In the following, normal reproduction is referred to as normal reproduction, and high-speed reproduction is referred to as high-speed reproduction.

Further, in the above-mentioned conventional high-efficiency coding method, there is a case where the data is coded in a unit and can be decoded only for each data in the unit, and the data which can be actually decoded can be read during the high speed reproduction. Less than the amount of data.

For example, the above-mentioned Japanese Patent Application No. 3-118825.
In the encoding method described in (1), the average and variance of the values obtained by converting the conversion coefficient for each frequency component over a certain range are used as additional information, but if these values cannot be read out, the block within the certain range It becomes unclear how many bits each transform coefficient is quantized. That is, even if the quantization index can be read, decoding cannot be performed unless the additional information can be read.

As described above, since a small amount of data has to be decoded at the time of high-speed reproduction, the image quality is very poor, and since fragmentary data is decoded, the reproduced image becomes very difficult to see.

In the above-described conventional inter-frame predictive coding method, the reference image used for prediction in order to reproduce the image must be decoded, so that an image that can be actually reproduced is further improved compared to the intra-frame encoding. Less, if you are using motion compensation, to replay a portion,
A reference image in a wider range than the reproduced range is required.

As shown in FIG. 17, when the conventional interframe coding method is used, since bidirectional prediction is used, the input image order and the data storage order are different. In addition, the amount of encoded data decreases in the order of I-picture, P-picture, and B-picture, and there is no clear relationship between the position where data is recorded and the time when that data is displayed. Even if the data can be read out at a constant interval during reproduction, it is impossible to determine what kind of data the data is.

As described above, the conventional method has a problem that high speed reproduction is very difficult.

In view of the problems of the above conventional method, an object of the present invention is to provide a moving picture recording / reproducing apparatus capable of high-speed reproduction, capable of both intra-frame prediction coding and inter-frame prediction coding. Especially.

[0025]

SUMMARY OF THE INVENTION An object of the present invention is to provide a first coding means for coding moving picture data into a predetermined data amount with high efficiency, and a moving picture data to be coded by the first coding means. Second encoding means for encoding with a data amount different from the encoded data amount, and data output from the first encoding device and second data connected to the first and second encoding means. This is achieved by a moving image recording / reproducing apparatus including a recording unit that records the data output from the encoding unit in a predetermined recording position by time division processing.

The moving picture recording / reproducing apparatus of the present invention is connected to the first coding means and the second coding means, and outputs from the data outputted from the first coding means and the second coding means. It may be configured to include an adding unit that adds predetermined information to the output data, and a control unit that is connected to the recording unit and controls the recording unit.

The moving picture recording / reproducing apparatus of the present invention comprises the access means for selecting and accessing the area in which the data output from the second encoding means is recorded during the high speed reproduction, and the second encoding. It is also possible to have a storage means for outputting the data encoded by the means in the order of input during high speed forward reproduction and outputting the data in reverse order during high speed reverse reproduction.

The moving picture recording / reproducing apparatus of the present invention comprises a judging means for judging whether the data read from the medium is data coded by the first coding means or data coded by the second coding means. First decoding means for decoding the data encoded by the first encoding means, second decoding means for decoding the data encoded by the second encoding means, and first and second Output selecting means connected to the decoding means for outputting data output from the first decoding means during normal reproduction and outputting data output from the second decoding means during high speed reproduction. May be configured so that

The moving picture recording / reproducing apparatus of the present invention comprises an access means for selecting and accessing an area in which the data output from the second encoding means is recorded during high speed reproduction, and a second decoding means. And storage means connected to the second decoding means for outputting the decoded data output from the second decoding means in the input order during the high speed forward reproduction and outputting the decoded data in the reverse order during the high speed reverse reproduction. You may comprise.

[0030]

In the moving picture recording / reproducing apparatus of the present invention, the first coding means codes the moving picture data into a predetermined data amount with high efficiency, and the second coding means codes the moving picture data into the first coding. The data amount encoded by the encoding device is different from the data amount encoded by the encoding device, and the recording device is connected to the first and second encoding devices, and the data and the second data output from the first encoding device. Data output from the encoding means is recorded at a predetermined recording position by time division processing.

In the moving picture recording / reproducing apparatus of the present invention, the adding means is connected to the first coding means and the second coding means, and the data and the second data outputted from the first coding means are supplied.
Predetermined information is added to the data output from the encoding means, and the control means is connected to the recording means and controls the recording means.

In the moving picture recording / reproducing apparatus of the present invention, the access means selects and accesses the area in which the data output from the second encoding means is recorded during high speed reproduction, and the storage means uses the second area. The data encoded by the encoding means is output in the input order during the high speed forward reproduction, and the data is output in the reverse order during the high speed reverse reproduction.

In the moving picture recording / reproducing apparatus of the present invention, the judging means judges whether the data read from the medium is the data coded by the first coding means or the data coded by the second coding means, The first decoding means decodes the data encoded by the first encoding means, the second decoding means decodes the data encoded by the second encoding means, and the output selecting means operates by the first Also, it is connected to the second decoding means and outputs the data output from the first decoding means during the normal reproduction and outputs the data output from the second decoding means during the high speed reproduction.

In the moving image recording / reproducing apparatus of the present invention, the access means selects the area in which the data output from the second encoding means is recorded during high-speed reproduction and accesses it, and the storage means stores the second data. The decoded data output from the second decoding means, which is connected to the second decoding means, is output in the input order during the high-speed forward reproduction, and the decoded data is output in the reverse order during the high-speed reverse reproduction.

[0035]

Embodiments of the moving image recording / reproducing apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an encoding unit which is one of the main parts of the moving picture recording / reproducing apparatus of the present invention.

The encoding section of FIG. 1 receives the moving image digital data and generates the encoded data for normal reproduction by the first encoder 11 as the first encoding means and the moving image digital data. A second encoder 12 which is a second encoding means for inputting and generating encoded data for high speed reproduction, a memory controller 13 for controlling FIFO buffers 14 and 15 described later, an encoder 11 and a memory.・ Controller 1
3 is connected to the FIFO buffer 14, which is a part of recording means for storing the output from the encoder 11, and which is connected to the encoder 12 and the memory controller 13 and stores the output from the encoder 12. A FIFO buffer 15 which is a part of the recording means for performing the operation is provided.

Next, the operation of the encoding unit shown in FIG. 1 will be described.

First, the encoder 11 and the encoder 12 respectively input digital moving image data.

The encoder 11 produces encoded data for normal reproduction, and the encoder 12 produces encoded data for high speed reproduction. Further, the encoders 11 and 12 add additional information for determining whether the data encoded by the encoder 11 or the data encoded by the encoder 12 at the time of decoding.

The high-efficiency coding method used in the encoder 11 is, for example, "MP
EG2 inter-frame prediction method "(TV Society Technical Report, VOL1
6, No61, pp37-42) and "MPEG2 quantization and coding control" (TV Society Technical Report, VOL16, No6).
1, pp43-48) can be used.

As an encoding method used in the encoder 12, for example, the following intra-frame encoding method can be used.

First, the input data is divided into blocks of 8 pixels × 8 pixels, and the average value for each block is obtained. Then, the average value is quantized with 4 bits. If the input data per pixel is 8 bits, the data amount becomes 1/128.
Furthermore, if the data is output every two frames,
The amount of data is 1/256.

The output of the encoder 11 is the FIFO buffer 1
4 and the output of the encoder 12 is input to the FIFO buffer 15.

The FIFO buffers 14 and 15 are controlled by the memory controller 13, respectively. The memory controller 13 switches between the case of outputting data from the FIFO buffer 14 and the case of outputting data from the FIFO buffer 15 at predetermined intervals. The switching timing changes depending on at what intervals the normal reproduction data and the high-speed reproduction data are recorded on the medium.

An example of switching in the memory controller 13 is shown in FIG.

FIG. 2 shows a case where 30 frames of image data are recorded per second, and one frame of data is written in one track on the tape. In this case, 1/3
Although one frame of data is written to one track at 0 second, 1/30 second is time-divided and 1/30 second of encoded data for high-speed reproduction and encoded data for normal reproduction is read.

The data output from the FIFO buffers 14 and 15 is output to a recording device and recorded on a medium such as a tape.

When the encoder 11 of FIG. 1 obtains an average value for each block, the above-mentioned encoding unit may be configured as shown in FIG.

The encoding unit of FIG. 3 is composed of the first encoder 16,
Second encoder 17, memory controller 18, FI
The FO buffer 19 and the FIFO buffer 20 are provided. The difference from the encoder of FIG. 1 is that the encoder of FIG.
The average value for each block is output from the first encoder 16,
This is an input to the second encoder 17.

In this case, the second encoder 17 may have a simple structure that only quantizes the input data.

For example, when DCT is performed for each block by the first encoder 16, the DC component of the DCT coefficient value may be extracted and input to the second encoder 17.

FIG. 4 is a block diagram showing the configuration of the second embodiment of the moving picture recording / reproducing apparatus of the present invention.

The moving picture recording / reproducing apparatus shown in FIG. 4 has a first encoder 21, a second encoder 22, a memory controller 23, a FIFO buffer 24, a FIFO buffer 25,
Time code adding circuit 26, media controller 2
Equipped with 7.

In the configuration of FIG. 4, the time code adding circuit 2
6, a media controller 27 is added, and the flag a is input from the memory controller 23 to the media controller 27, which is different from the configuration of FIG.

In the present embodiment, the time code enables random access on a disk medium or the like.
The time code adding circuit 26 is configured to add a time code indicating time information to the encoded data,
The media controller 27 is configured to control the recording position on the medium.

FIG. 5 shows an example of switching of output data in the memory controller 23.

FIG. 5 shows an example in which encoded data for high speed reproduction is recorded every 5 seconds. In this case, the coded data for normal reproduction for 5 seconds and the coded data for high speed reproduction for 5 seconds are read from the FIFO buffers 24 and 25 for 5 seconds.

The memory controller 23 also inputs to the media controller 27 a flag a indicating which buffer the data is being read from.

As an example of the information added by the time code adding circuit 26, 6-byte information in which hour, minute, and second are each represented by 2 bytes can be considered. First, time information is added to the beginning of the data input from the FIFO buffer 24,
Next, when the input is switched from the FIFO buffer 25, the same time information is added to the beginning of the information from the FIFO buffer 25. And the next FIFO buffer 2
When the data is switched to the data from 4, the time information indicating 5 seconds after the previous time information is added.

The time code can also be added by the encoder 21 and the encoder 22. In this case, the function of the time code adding circuit 26 is incorporated in the encoders 21 and 22, and the time code adding circuit 26 can be omitted.

According to the flag a from the memory controller 23, the media controller 27 determines whether to record the output data of the time code adding circuit 26 in the normal reproduction area or the high speed reproduction area of the medium. , Control the recording device.

Note that the embodiment of FIG. 1 is intended for tape media, and the encoder 12 of FIG. 1 was applicable only to intraframe coding, but this embodiment is a disk media capable of random access. Therefore, the interframe coding method can also be used as the coding method used by the encoder 22.

FIG. 6 is a block diagram showing the structure of a moving picture reproducing / recording apparatus to which a browsing function is added, which is a third embodiment of the moving picture reproducing / recording apparatus of the present invention.

Here, the browsing function means, for example, a function of displaying reduced images of images on the disc at regular intervals on a single screen and listing the contents of the disc.

The moving picture reproducing / recording apparatus of FIG. 6 includes a first encoder 31, a second encoder 32, a memory controller 33, a FIFO buffer 34, a FIFO buffer 35,
Time code addition circuit 36, media controller 3
7, a memory 38, a memory controller 39, and a counter 40.

In the configuration of FIG. 6, the memory controller 33
The flag b from the media controller 37 to the media controller 37 is the same as the flag a in FIG. 4 and indicates which of the FIFO buffers 34 and 35 is reading data.

The memory 38 is a memory for storing data for browsing. When the medium is inserted into the device, the media controller 37 controls the recording device to read the data for browsing already recorded on the medium, and the memory controller 39 stores the read data in the memory 38. Control to write.
The data for browsing may be written in, for example, the TOC portion of the medium or a certain area next to the TOC.

As an example of the data stored in the memory 38, one frame of encoded data generated by the encoder 32, input data recording time, information indicating the recording position on the medium, and the like can be considered. .

When the recording of the input data is instructed, the FI
The FO buffers 34 and 35 receive the encoded data from the encoder 31 and the encoder 32, respectively, and the memory 38 also receives the encoded data from the encoder 32. Also,
Information indicating the recording start position of data on the medium is input from the medium controller 37. Here, the memory controller 39 instructs the memory 38 to write the information indicating the recording position of the data and the encoded data for one frame at a predetermined position of the memory 38. Counter 40
Then, the recording time of the input data is counted.

When the recording of the input data is completed, the memory controller 39 controls the recording time information from the counter 40 to be recorded in a predetermined position of the memory 38.
Next, the media controller 37 controls the recording device to record the updated browsing data at a predetermined position on the medium.

With the above operation, one browsing data is created every time one moving image sequence is recorded, and data corresponding to the moving image sequence recorded on the medium is created.

FIG. 7 is a block diagram showing the configuration of the first embodiment of the decoding unit which is the other main part of the moving picture reproducing / recording apparatus of the present invention.

The decoding unit shown in FIG. 7 is configured to decode the data encoded and recorded by using the encoding unit shown in FIG. 1. The data is read from the medium and encoded by the encoder 11 shown in FIG. Determination circuit 41 for determining whether the data is encoded data or data encoded by the encoder 12, the data encoded by the encoder 11 is connected to the determination circuit 41, A first decoder 42 that reproduces and outputs an image for reproduction and is connected to the determination circuit 41, receives data encoded by the encoder 12, and reproduces an image for high-speed reproduction from the input data. Second to output
Decoder 43, image data for normal reproduction output from the decoder 42 connected to the decoders 42, 43, image data for high speed reproduction output from the decoder 43, and whether high speed reproduction is designated. Flag c that contains information indicating whether
Is input and the flag c indicates normal reproduction, the input data from the decoder 42 is output, and when the flag c indicates high speed reproduction, the selector 44 that outputs the input data from the decoder 43 is output. I have it.

Next, the operation of the decoding unit shown in FIG. 7 will be described.

First, the data is read from the medium and input to the judgment circuit 41.

The determination circuit 41 determines whether the data encoded by the encoder 11 of FIG. 1 or the data encoded by the encoder 12 based on the input data, and the encoder 11
The data coded by (4) is output to the decoder 42, and the data coded by the encoder 12 is output to the decoder 43.

In the embodiment shown in FIG. 1, each of the encoders 11 and 12 is provided with additional information indicating which data, so that the determination circuit 41 can easily perform the determination.

The decoder 42 reproduces an image for normal reproduction from the input data and outputs it to the selector 44. Decoder 43
Reproduces an image for high-speed reproduction from the input data and outputs it to the selector 44.

The selector 44 inputs the image data for normal reproduction from the decoder 42, the image data for high speed reproduction from the decoder 43, and a flag c including information indicating whether or not high speed reproduction is designated. The selector 44 outputs the input data from the decoder 42 when the flag c indicates normal reproduction, and outputs the input data from the decoder 43 when the flag c indicates high speed reproduction.

In the embodiment of FIG. 1, since one frame of high-speed reproduction data is recorded on one track, the reproduction head is scanned once for both high-speed forward reproduction and high-speed reverse reproduction. Thus, high-speed reproduction data for one frame recorded on one track can be obtained. Therefore, it is sufficient to decode the obtained data for high-speed reproduction for both high-speed normal reproduction and high-speed reverse reproduction, and both high-speed normal reproduction and high-speed reverse reproduction can be realized by the same circuit.

When the size of the image input from the decoder 43 is smaller than that of the decoder 42, the selector 44 of FIG. 7 may be configured as shown in FIG.

In FIG. 8, the frame memory 5 is added to the selector 51.
2 and a memory controller 53 for controlling the frame memory 52 are added.

In this embodiment, the output data of the selector 51 is output as it is during normal reproduction, and the input data and the past reproduced image stored in the frame memory 52 are combined and output during high speed reproduction.

The selector 51 operates in the same manner as the selector 44 of FIG.

The flag c indicating normal reproduction or high speed reproduction is
It is input to the selector 51 and also to the memory controller 53. When the flag c indicates normal reproduction, the memory controller 53 writes the input data in the frame memory 52.
To control.

When the flag c indicates high speed reproduction, the memory controller 53 outputs the past data accumulated in the frame memory 52, and when the selector 51 outputs the image for high speed reproduction. Only to stop the output from the frame memory 52. By this operation, the image for high-speed reproduction and the past image for normal reproduction are combined and output.

Next, referring to the flowchart of FIG.
The operation of the memory controller 53 when the high speed reproduction is designated will be described. Note that, here, it is assumed that the images for one frame shown in FIG. 10 are combined.

First, (i, j) indicating the pixel coordinates is set to (0, 0) (step S1), and it is determined whether or not it is a position for displaying an image for high speed reproduction (steps S2, S).
3) If it is determined in steps S2 and S3 that the image for high-speed reproduction is not displayed, the data at the (i, j) position of the frame memory is output (step S4).
On the other hand, when it is determined in the above steps S2 and S3 that it is the position for displaying the image for high speed reproduction, the selector 51
Since the image data for high speed reproduction is output from the i, the i value indicating the x coordinate value is output without outputting the data from the frame memory.
Is incremented (step S5), and it is checked whether i is within the image size for normal reproduction (step S5).
6) If i indicates within the image size in step S6, the process returns to step S2, while on the other hand, in step S6,
If i is out of the image size in 6, then i is set to 0 and y
Increment j indicating the coordinate value (step S
7). Then, it is checked whether or not j is within the image size for normal reproduction (step S8). If it is determined in step S8 that the image size is within the image size, the process returns to step S2 and the image is reproduced in step S8. If it is determined that the size is out of the size, it means that the image of one frame has been output, and the process ends.

FIG. 11 is a block diagram showing the configuration of the second embodiment of the decoding section of the moving picture reproducing / recording apparatus of the present invention.

FIG. 11 is a circuit for decoding the data coded by the coding unit of FIG. 4, and is configured to be applied when the encoder 22 of FIG. 4 performs intraframe coding. The present embodiment is an example of the case where a randomly accessible disk medium is used as the recording medium.

The decoding section of FIG. 11 is connected to the time code selection circuit 61, the judgment circuit 62 connected to the time code selection circuit 61, the first decoder 63 connected to the judgment circuit 62, and the judgment circuit 62. Memory 67, second decoder 64 connected to memory 67, decoder 63 and selector 65 connected to decoder 64, media controller 66 connected to time code selection circuit 61, memory controller connected to memory 67 Equipped with 68.

When using a disk medium, unlike a tape medium, the area to be read out at the time of high-speed reproduction is not fixed. Therefore, the encoded data for high-speed reproduction for a certain period are collectively recorded and used for high-speed reproduction. The data for high-speed reproduction is read by sequentially randomly accessing the area. Therefore, in the embodiment of FIG. 11, in addition to the configuration of FIG. 7, a media controller 66 for random access, and a memory 67 and a memory controller 68 so as to be compatible with high speed reverse playback are added.
Further, a time code selection circuit 61 for collecting the time information added by the time code addition circuit 26 of FIG. 4 is connected to the input section of the determination circuit 62. Further, a flag d indicating that high-speed forward reproduction is instructed, a flag e indicating that high-speed reverse reproduction is instructed, and a signal f indicating how many times the speed is designated are input. ing.

Next, the operation of the decoding unit shown in FIG. 11 will be described.

The time code selection circuit 61 collects time information from the input data, the time information is sent to the media controller 66, and the encoded data excluding the time information is judged by the decision circuit 6.
Output to 2 respectively. The operation of the determination circuit 62 is the same as that of the determination circuit 41 of FIG.

The media controller 66 has a flag d,
The flag e, the signal f, and the data output from the time code selection circuit 61 are input, and information about how many times the speed is in the case of high-speed forward reproduction or high-speed reverse reproduction and time information of the currently read data Thus, the reproducing apparatus is controlled so as to access an area in which appropriate high-speed reproducing data is recorded.

The data for high speed reproduction read from the medium are collectively input to the memory 67.

The memory controller 68 has a flag d,
The flag e and the signal f are input, and it is possible to know whether high-speed forward reproduction is instructed, high-speed reverse reproduction is instructed, or how many times the speed is instructed.

When the high speed forward reproduction is instructed, the memory controller 68 treats the memory 67 like a FIFO buffer and outputs the input data in the input order, and when the high speed backward reproduction is instructed. , The input data is divided into frames and the data of the last input frame is output.

Decoder 63 and decoder 64 are respectively shown in FIG.
The same operation is performed as the decoder 42 and the decoder 43 of.

The selector 65 operates almost the same as the selector 44 of FIG. That is, when both the flag d and the flag e are off (OFF), the decoder 63
Output the data input from
When it is N), the data input from the decoder 64 is output.

FIG. 12 shows a configuration example of the memory 67 and the memory controller 68 of FIG.

The memory 67 includes a switch 91 and a selector 9
2 and FIFO buffers 101 to 175 for the number of frames of high-speed reproduction data input at one time.

The capacity of each of the FIFO buffers 101 to 175 is the amount of encoded data for high speed reproduction for one frame. FIG. 12 shows a case in which high-speed reproduction data is output every two frames and a high-speed reproduction area is provided every 5 seconds as described in the configuration of FIG. In this case, since 75 frames of high-speed playback data are read at a time, 75 FIFO buffers are required. Also,
When storing in the FIFO buffer in units of fields, 150 FIFO buffers are required.

When the high speed forward reproduction is designated, the memory controller 68 determines that the input data of the first frame is F.
The IFO buffer 101 stores the data of the next frame in the FI.
The switch 91 is controlled so as to enter the FO buffer 102. Then, the data is first output from the FIFO buffer 101 to the selector 92, and after 1 frame time, the FIFO buffer 101 outputs the data.
The O buffer 102 is controlled to output data. Here, since the input data is data for every two frames, the data for every two frames is output from the selector 92.

When high-speed reproduction of 2 × speed or more, for example, 4 × speed reproduction is designated, first, the FIFO buffer 101
To output data, then 1 frame time later FIFO
Control is performed so that data is output from the buffer 103.
This causes the selector 92 to output data for every four frames.

By adaptively changing the output buffer in this way, it is possible to deal with any speed.

When the fast reverse playback is designated, the memory controller 68 stores the data of the first frame in the FIFO buffer 175, which is the last buffer, in the next 1
The switch 91 is controlled so that the data for the frame enters the FIFO buffer 174. If this operation is repeated,
The data of the last frame of the data for 5 seconds is input to the FIFO buffer 101.

As with the normal reproduction, the selector 92 first selects F
Data is output from the IFO buffer 101, and the data is output from the FIFO buffer 102 after one frame time. This causes the selector 92 to output data in the reverse direction every two frames.

The same applies to the case of high-speed backward reproduction of 2 × speed or more. For example, when quadruple-speed backward reproduction is designated, data is first output from the FIFO buffer 101 and then data is output from the FIFO buffer 103. When the output is controlled to be output, the selector 92 outputs the data in the reverse direction every four frames.

FIG. 13 is a block diagram showing the configuration of the third embodiment of the decoding section of the moving picture reproducing / recording apparatus of the present invention.

The decoding unit of FIG. 13 is a circuit for decoding the data encoded by the encoding unit of FIG. 4, and is the encoder 2 of FIG.
It is applied when interframe coding is performed in 2.

In the decoding section of FIG. 13 and the above-mentioned decoding section of FIG. 11, the encoded data for high speed reproduction is input from the determination circuit 62 to the memory 67 in FIG. 11, but is decoded in the memory 77 in FIG. The difference is that the image data for high speed reproduction decoded by the device 74 is input.

The structure of the memory 77 of FIG. 13 is almost the same as that of the memory 67 of FIG. 11, and the memory 67 of FIG. 11 has a FIFO buffer for storing the encoded data of one frame, and the amount of data for high speed reproduction inputted at one time. I was prepared for it, but Figure 13
The memory 77 of the FI stores the decoded image for one frame.
The FO buffer is provided for the decoded images that are successively decoded by the decoder 74. Control of data input and output of the memory 77 of FIG. 13 is the same as that of the memory 67 of FIG.

FIG. 14 is a block diagram showing the configuration of the fourth embodiment of the decoding section of the moving picture reproducing / recording apparatus of the present invention.

The decoding section of FIG. 14 is a circuit for reproducing the data recorded in the configuration of FIG. 6, that is, for decoding the data encoded by the encoding section of FIG. 6, and has a browsing function added.

The decoding section of FIG. 14 is connected to a time code selection circuit 81, a judgment circuit 82 connected to the time code selection circuit 81, a first decoder 83 connected to the judgment circuit 82, and a judgment circuit 82. Memory 87, second decoder 84 connected to memory 87, decoder 83 and selector 85 connected to decoder 84, media controller 86 connected to time code selection circuit 81, memory controller connected to memory 87 88, second decoder 84, selector 85, memory 89 connected to media controller 86, memory controller 9 connected to memory 89
It has 0.

At the time of normal reproduction or high speed reproduction, the above-mentioned constituent parts 81 to 88 of FIG. 14 operate almost the same as the constituent parts 61 to 68 of FIG. The flags j and k and the signal l are the same as the flags d and e and the signal f in FIG. 11, respectively.

When a medium is inserted into the device, the media controller 86 controls the reproducing device so as to read the data for browsing. Then, the read data is stored in the memory 89.

When browsing is designated, the memory controller 90 selects the browsing data from the memory 89, the data encoded by the encoder 32 in FIG. 6 is the decoder 84, and the other data is the selector. The output is controlled to 85. The selector 85 receives the decoded image for high-speed reproduction for one frame from the decoder 84 and the recording time information from the memory 89.
In 5, the input data is combined in an appropriate format and output.

The selector 85 has the same structure as that shown in FIG. 8, and temporarily stores an input image, time information and the like in the frame memory, synthesizes them, and outputs them.

For example, by displaying a plurality of browsing data on one screen, the contents of the entire disc can be viewed.

The coding method used in the above embodiments and the intervals at which the areas for recording the coded data for high speed reproduction are provided are examples, and the present invention is not limited to the above examples.

Further, the data used in browsing, the method of expressing the time, and the like are also examples. In the embodiment, the coded data for high-speed reproduction is used as the image data, but the coded data is newly created for browsing. It doesn't matter.
Furthermore, although the method of expressing the time is hour, minute, and second in this embodiment, various expressions such as adding a frame number to this can be used. In the present embodiment, one browsing data is created for one moving image sequence, but a plurality of data may be created.

Further, the browsing data only needs to be stored at a certain position on the medium, and is a portion for recording information about the contents of the disc such as the type of data recorded on the disc and the recording time.
It can be recorded in any part, including (Table Of Contents) and the first part of the media.

FIG. 15 shows an example of recording data encoded by the present invention on a tape medium. Here, a case is shown in which encoded data is recorded on a helical track, where the first part of one track is the high-speed reproduction area, and the other is the normal reproduction area.

When data is recorded in the example of FIG. 15, encoded data for normal reproduction and encoded data for high speed reproduction are created. The encoding device has two memories (first and second memories).
Memory), first, encoded data for high-speed reproduction is recorded in a short time, and image data for normal reproduction during that time is stored in the first memory. Next, the normal reproduction coded data corresponding to the high-speed reproduction image is recorded, and the high-speed reproduction image in the meantime is accumulated in the second memory. When the encoded data for normal reproduction is completely recorded on the medium, the recording is resumed from the encoded data for high-speed reproduction accumulated in the second memory, and this operation is repeated.

When reproducing the data recorded in this way, the reproducing head reads out the data of the entire helical track in one scan during normal reproduction. In this case, the reproduced image may be output using only the data read from the normal reproduction area.

Further, at the time of high speed reproduction, the head scans so as to cross the track, but since it always crosses the high speed reproduction area by one scan, the data for high speed reproduction recorded on one track can be obtained. If the encoding method used in the encoder for high-speed reproduction is the intraframe encoding method,
Since the image can be reproduced only by the obtained data for high speed reproduction, it is only necessary to output the decoded image using the image data for high speed reproduction.

FIG. 16 shows an example of how to divide the normal reproduction area and the high-speed reproduction area when a disk such as (MO) is used as the recording medium. In FIG. 16, an area for recording coded data for high speed reproduction is provided every 5 seconds. The actual recording track may have a plurality of concentric circles or may have a spiral shape from the inner circumference of the disc to the outer circumference, but here it is represented by straight lines for convenience.

When recording data in the example of FIG. 16, normally, encoded data for normal reproduction and encoded data for high speed reproduction are created as in the tape medium described above. The encoding device is provided with two memories, the encoded data for normal reproduction is recorded on the medium, and the encoded data for high speed reproduction during that time is accumulated in the second memory. Then, the coded data for high-speed reproduction stored in the memory is recorded on the medium in a short time every fixed period, and the coded data for normal reproduction during that time is stored in the first memory. When the encoded data for high-speed reproduction is recorded on the medium, the recording is restarted from the encoded data for normal reproduction accumulated in the memory, and this operation is repeated.

At the time of decoding, in the case of normal reproduction, the data reproduced by using the data for normal reproduction is displayed, and when high-speed reproduction is designated, the area for high-speed reproduction is randomly accessed to obtain the obtained data. The images are decoded and the images for high speed reproduction are sequentially reproduced. At this time, high-speed reverse reproduction can be realized by temporarily storing the obtained data for high-speed reproduction or the decoded image in a memory and outputting it in reverse order for each frame data.

When recording on tape media, the intraframe coding method can be used as the data coding method for high speed reproduction, but the interframe coding cannot be used.

However, in the case of recording on the disk medium as shown in FIG. 16, since the coded data for high speed reproduction are obtained collectively, the interframe coding can also be used.

In the case of a disk medium, the browsing function can be realized by recording a part of the recording data in another area.

As the data to be recorded, for example, one frame of the recording data for high speed reproduction, the recording time,
Positional information on the medium on which the data is recorded can be considered.

The device is equipped with a memory for browsing, and when the disc is inserted, the data for browsing is read out. When recording is designated, for example, one frame of encoded data for high-speed reproduction is stored in the memory as a part of the recording data, and the recording position on the medium is also recorded in the memory. When the recording of the input data is completed, the recording time is also recorded in the memory. Then, the data including the added browsing data is recorded at a predetermined position on the medium.

When browsing is specified during reproduction, the browsing data recorded in the memory is output in a predetermined format. This allows an overview of the contents of the disc at one time even if multiple data are recorded.

Here, as the encoded data for high speed reproduction, for example, a quantized value of a DC component (equivalent to the average value in the block) after DCT for each block can be considered.
If the image size for high-speed playback is smaller than the image size for normal playback, as in this case, the entire screen is kept stationary during high-speed playback, a sub-screen for high-speed playback is provided, and playback for high-speed playback The image may be displayed.

As described above, the moving image recording / reproducing apparatus of the present invention creates highly efficient encoded data for normal reproduction and highly efficient encoded data for high speed reproduction at the time of encoding. An area for storing an image for high speed reproduction is provided on a disk or a tape which is a recording medium, and these data are written in a normal reproduction area and a high speed reproduction area respectively in a time division manner. The purpose of high-speed reproduction is to give an overview of the image, and high image quality is not required as much as normal reproduction. Therefore, the image quality and image size of the image for high-speed reproduction may be lower than in normal reproduction. By lowering the image quality and image size of images for high-speed playback compared to normal playback, the amount of encoded data for high-speed playback can be made extremely small compared to the amount of encoded data for normal playback, and long memory can be saved. It is possible to accumulate high-speed reproduction data for an amount of time and read / write high-speed reproduction data for a long time in a short time.

[0141]

The moving picture recording / reproducing apparatus according to the present invention codes the moving picture data by the first coding means for coding the moving picture data into a predetermined data amount with high efficiency, and the moving picture data by the first coding means. Second encoding means for encoding with a data amount different from the encoded data amount, and data output from the first encoding device and second data connected to the first and second encoding means. Recording means for recording the data output from the encoding means at a predetermined recording position by time division processing,
Both intra-frame predictive coding and inter-frame predictive coding can be supported, and high-speed reproduction is possible.

The moving picture recording / reproducing apparatus of the present invention is connected to the first encoding means and the second encoding means, and outputs the data output from the first encoding means and the second encoding means. Since the addition means for adding predetermined information to the output data and the control means connected to the recording means for controlling the recording means are provided, it can be used for either intra-frame predictive coding or inter-frame predictive coding. It is also compatible with high-speed playback.

The moving picture recording / reproducing apparatus of the present invention comprises the access means for selecting and accessing the area in which the data output from the second encoding means is recorded during the high speed reproduction, and the second encoding. Since the data encoded by the means is output in the input order during high-speed forward reproduction, and the storage means outputs the data in reverse order during high-speed reverse reproduction,
When encoding moving image data with high efficiency, it is possible to create data for high speed reproduction as well as data for normal reproduction, and to create a predetermined area other than the area for recording coded data for normal reproduction. It is possible to record encoded data for high speed reproduction. As a result, at the time of high-speed reproduction, the data for high-speed reproduction can be read and high-speed reproduction can be performed regardless of the high-efficiency encoding method for normal reproduction.

The moving picture recording / reproducing apparatus of the present invention comprises a judging means for judging whether the data read from the medium is the data coded by the first coding means or the data coded by the second coding means. First decoding means for decoding the data encoded by the first encoding means, second decoding means for decoding the data encoded by the second encoding means, and first and second Output selecting means connected to the decoding means for outputting data output from the first decoding means during normal reproduction and outputting data output from the second decoding means during high speed reproduction. Therefore, at the time of decoding, the data reproduced by using the data for normal reproduction can be displayed in the case of normal reproduction, and the image for high-speed reproduction can be sequentially reproduced and output when high-speed reproduction is designated.

The moving picture recording / reproducing apparatus of the present invention comprises an access means for selecting and accessing an area in which the data output from the second encoding means is recorded during high-speed reproduction, and a second decoding means. Connected to the second decoding means and outputs the decoded data output from the second decoding means in the order of input during high-speed forward reproduction, and outputs the decoded data in reverse order during high-speed reverse reproduction. The encoded data or the decoded image for high speed reproduction can be stored in the storage means and output in reverse for each frame. As a result, normal direction reproduction and reverse direction reproduction can be performed at high speed.

[Brief description of drawings]

FIG. 1 is a first encoding unit of a moving image recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

FIG. 2 is a time chart for explaining the operation of the memory controller of FIG.

FIG. 3 is a second encoding section of the moving image recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

FIG. 4 is a third encoding unit of the moving image recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

5 is a time chart for explaining the operation of the memory controller of FIG.

FIG. 6 is a fourth encoding section of the moving image recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

FIG. 7 is a block diagram showing a configuration of a first embodiment of a decoding unit of the moving picture recording / reproducing apparatus of the present invention.

8 is a block diagram showing a configuration of a modified example of the selector shown in FIG.

9 is a flowchart for explaining the operation of the memory controller of FIG.

10 is an explanatory diagram of a positional relationship in which an image for high speed reproduction is combined with a normal reproduction screen by the decoding unit in FIG.

FIG. 11 is a second decoding section of the moving picture recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

12 is a block diagram showing the configuration of the memory of FIG. 11. FIG.

FIG. 13 is a third decoding section of the moving picture recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

FIG. 14 is a fourth part of the decoding unit of the moving picture recording / reproducing apparatus of the present invention.
It is a block diagram which shows the structure of an Example.

FIG. 15 is an explanatory diagram when a recording area of encoded data for high-speed reproduction is installed on the tape medium by the encoding unit of the moving image recording / reproducing apparatus of the present invention.

FIG. 16 is an explanatory diagram when a recording area of encoded data for high-speed reproduction is installed on a disk medium by an encoding unit of the moving image recording / reproducing apparatus of the present invention.

FIG. 17 is an explanatory diagram of an example of a conventional interframe coding method.

[Explanation of symbols]

 11 First Encoder 12 Second Encoder 13 Memory Controller 14 FIFO Buffer 15 FIFO Buffer

Claims (5)

[Claims] 1. A moving picture recording / reproducing apparatus for coding and recording moving picture data with high efficiency, and first coding means for coding moving picture data into a predetermined data quantity with high efficiency; and the moving picture data. Is connected to the first and second encoding means, and second encoding means for encoding with a data amount different from the data amount encoded by the first encoding means. A moving image, comprising: recording means for recording the data output from the first encoding means and the data output from the second encoding means at a predetermined recording position by time division processing. Recording / playback device. 2. The moving image recording / reproducing apparatus according to claim 1, wherein data output from said first encoding means and connected to said first encoding means and said second encoding means, and A moving image comprising: an addition unit that adds predetermined information to the data output from the second encoding unit; and a control unit that is connected to the recording unit and controls the recording unit. Recording / playback device. 3. The moving image recording / reproducing apparatus according to claim 2, wherein an access means for selecting and accessing an area in which the data output from the second encoding means is recorded during high-speed reproduction, Storage means for outputting the data encoded by the second encoding means in the input order during the high speed forward reproduction and outputting the data in the reverse order during the high speed reverse reproduction. Video recording / playback device. 4. The moving picture recording / reproducing apparatus according to claim 1 or 2, wherein the data read from the medium is coded by the first coding means or coded by the second coding means. Determination means for determining whether it is data, first decoding means for decoding the data encoded by the first encoding means, and second decoding means for decoding the data encoded by the second encoding means And the second decoding means connected to the first and second decoding means and outputting the data output from the first decoding means during normal reproduction and the second decoding means during high-speed reproduction. A moving image recording / reproducing apparatus comprising: an output selecting unit that outputs data output from the moving image recording / reproducing apparatus. 5. The moving image recording / reproducing apparatus according to claim 4, wherein an access unit for selecting and accessing an area in which the data output from the second encoding unit is recorded during high-speed reproduction, A memory which is connected to the second decoding means and outputs the decoded data output from the second decoding means in the input order during the high speed forward reproduction and outputs the decoded data in the reverse order during the high speed reverse reproduction. And a moving image recording / reproducing apparatus.