JP3104415B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, a JPEG (Joint Photographic Exposure) as a color still image coding system.
ert Group) digital video signal and AD
Information recording related to a video disk recorder capable of recording / reproducing a digital audio signal compressed by a PCM (Adaptive Differential PCM, Adaptive Prediction Differential Coding) method with a disk device such as a magneto-optical disk or a hard disk, and a semiconductor memory continuously in a synchronized manner. It relates to a playback device.

[0002]

2. Description of the Related Art Conventionally, a digital video signal compressed according to the JPEG standard and a digital audio signal compressed according to the ADPCM method are continuously and synchronously recorded on a disk device such as an optical disk or a hard disk, or a semiconductor memory, and recorded thereon. There is no video disc recorder that reproduces the reproduced data and continuously reproduces a digital video signal expanded according to the JPEG standard and a digital audio signal expanded according to the ADPCM method.

[0003]

Conventionally, while reproducing a long videotape on which a large number of video scenes are continuously recorded together with audio with a master VTR, necessary video scenes are taken out while looking at a monitor as needed. When video editing, such as performing a recording operation in a slave VTR by removing necessary parts and connecting only necessary video scenes, the master V
The video tape loaded in the TR had to be rewound many times and fast-forward playback had to be repeated, which required a long working time.

Also, for example, when correcting a form of an athlete using a video camera and a VTR, the athlete corrects the form by repeatedly viewing his / her own form taken by a video camera. To V
Since it is necessary to record in a TR and rewind and play it back, there is a disadvantage that the video cannot be instantly monitored after the form is corrected.

[0005]

In order to solve the above-mentioned problems, the present invention provides an information recording / reproducing apparatus having the following configuration.

A data compression means for outputting compressed data obtained by compressing an input image signal in image frame units, and the compressed data outputted from the data compression means in image frame group units which are a set of a predetermined number of image frames. Data recording / reproducing means for recording and reproducing the compressed data already recorded in image frame group units as reproduction compressed data using a predetermined data transfer amount; and the reproduction compression output from the data recording / reproduction means. An information recording / reproducing apparatus comprising: a data decompressor for outputting data as an output image signal in which data is complementarily decompressed with data at the time of data compression. When recording, the compressed data of each image frame for the predetermined data transfer amount is A difference data information recording means for recording the difference data amount of the data amount as difference data information, and, when an instruction to start playback of an image is given, the playback compression over the entire image frame group relating to the image for which playback is instructed. Prior to outputting data from the data recording / reproducing means to the data decompressing means, buffering data of a difference data amount relating to the differential data information over the entire image frame group is read out from the data recording / reproducing means. Buffer means for temporarily recording data from a first address to a second address; and when the buffering data is temporarily recorded in the buffer means, the buffer means transfers the data from the first address to the data decompression means. At the same time as starting to output the ring data, the data Control means for controlling the operations of the buffer means and the data recording / reproducing means so that the means starts outputting the reproduced compressed data over the entire image frame group from the address immediately after the second address. An information recording / reproducing apparatus comprising: reproducing an output image signal of an image frame group relating to an image for which reproduction is instructed without interruption.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An information recording / reproducing apparatus according to the present invention will be described below with reference to FIGS.

FIG. 1 is a system block diagram of a moving picture recorder as an embodiment of an information recording / reproducing apparatus according to the present invention, FIG. 2 is a diagram for explaining a compression operation of two compression / decompression units,
3 is a time chart of the start of the operation of the recording data transfer process, FIG. 4 is a time chart of the end of the operation of the recording data transfer process, FIG. 5 is a time chart of the start of the operation of the reproduction data transfer process, and FIG. Chart, FIG. 7 is a diagram for explaining an operation panel of the moving image recorder, FIG. 8 is a diagram for explaining a prefetch management table,
FIG. 9 shows frame number 1 in frame group number 1.
FIG. 10 shows frame numbers Gsto to Glt in a frame group number Gnum.
FIG. 11 is a diagram for explaining the reproduction start frame of frame number GstN to Glt in frame group number Glast.
FIG. 9 is a diagram for explaining a reproduction start frame of N. The data compression / expansion means according to the configuration of the information recording / reproducing apparatus according to the present invention are the compression / expansion units 2d1 and 2d2, and the temporary storage means is, for example, a buffer memory (not shown) built in the CPU 5b.

The information recording / reproducing apparatus according to the present invention is configured based on the following basic concept. That is, when a moving image is compressed using an image compression / decompression processor (compression / decompression units 2d1 and 2d2 described later) compliant with the JPEG standard, the compression ratio changes according to the subject (for example,
The compression ratio is high for a dark subject, and low for a whitish subject.) This data is stored in an external storage device (for example, a magneto-optical disk driver 6 described later).
a, the hard disk driver 6b, etc.), the data transfer amount changes due to the variation of the compression ratio depending on the subject at the time of reproduction (for example, in the case of a dark subject, the compression ratio is large, Is large, and in the case of a whitish subject, the compression ratio is small, so that the data transfer amount during reproduction is small.)

For this reason, it is necessary to absorb the change in the data transfer amount caused by the variation in the compression ratio that occurs in accordance with the change in the information amount of the subject, and always reproduce the data at a constant data transfer amount. For this reason, at the time of reproduction, it is conceivable that data to be reproduced is prefetched to some extent and buffered (temporarily stored). However, the amount of data to be prefetched and buffered is generally determined. I can't. If the amount of data to be buffered is small, data will be insufficient in the middle and playback will not be possible, and if the data to be buffered will be read after reading the entire capacity of the buffer,
After receiving the playback start instruction and before the playback image appears,
It may take 6 seconds.

Therefore, the information recording / reproducing apparatus according to the present invention is intended to maintain a balance between the amount of data to be pre-read and the reproduction start time (in order to always ensure the amount of buffering data that can be instantaneously reproduced). This uses a look-ahead management table, which will be described later, composed of data to be pre-read (stored in an internal memory of the CPU 5b). Specifically, a buffer memory (for example, 2 to 2...) That buffers data reproduced from the above-described external storage device by setting 30 frame data described later as one unit (hereinafter, referred to as “frame group”). Using a buffer memory having a capacity of about 5 Mbytes, a buffer memory built in the CPU 5b, etc.)
ER "0" to "9"
Specify the number and enter “CHAPTER”
When the "H" key 424 is pressed, the external storage device enters a reproducing state prior to the reproduction specifying operation, and data relating to the specified chapter is immediately buffered in the frame group unit in advance, and the reproduction specification performed thereafter is performed. Operation ("REV SCAN" switch 414, "FWDS
"CAN" switch 415, "REV PLAY" switch 416, "FWD PLAY" switch 417, "RE
VSLOW switch 418, FWDSLOW switch 419, REV STILL STEP switch 420, or FWD STILL STEP switch 421). is there.

By the way, the data handled by this apparatus includes:
There are the above-mentioned frame data, frame management data for managing the frame data, chapter management data for further managing the frame management data, and other data related to recording and reproduction, and data indicating the type of the media unit 6 described later.

The above-mentioned frame data constituting a frame group is configured to handle image / audio data to be recorded / reproduced in video frame units, and includes a header section,
It consists of an audio part and an image part. Each frame has a size of about 8.2 kbytes (when the hard disk driver 6b and the semiconductor memory 6c are used) to about 16.6 kbytes (when the magneto-optical disk driver 6a is used).

The above-mentioned frame management data is managed in units of frame data. A set of these is a frame data management table. The frame data management table manages the state, size, storage location, order, and the like of the frame data. The frame data management table includes (1) management data on each medium of a magneto-optical disk driver 6a, a hard disk driver 6b, and a semiconductor memory 6c which constitute a media unit 6 described later, and (2)
It is classified into management data on the buffer memory.

The contents of "management data on media" are as follows.・ Frame start block address (sector unit) ...
………… 4 bytes ・ Frame number ………………………………………
············ 4 bytes ・ Frame status (erased, recorded, skipped, unused, error, mute) ………………………
………… 2 bytes • Frame size (byte unit, Fsize) ……………
... 4 bytes Total 14 bytes The content of "management data on buffer memory" is shown below.・ Frame start memory address ………………………
………… 4 bytes ・ Frame number ………………………………………
………… 4 bytes ・ Frame size (byte unit, Fsize) ……………
…………… 4 bytes • Frame status (data ready, data free,
(Skip, writing, reading, data used, error, mute, end flag) ...............
... 2 bytes Total 14 bytes The above-described chapter management data is registered as a set of a reproduction start frame and a reproduction end frame, and is updated every time recording is performed. The chapter management data is managed by a chapter management table. The contents of the “chapter management table” are shown below.・ Playback start frame number (Fst) …………………………
………… 4 bytes • Reproduction end frame number (Flast) ……………………
………… 4 bytes ・ Chapter status (erased, recorded, skipped, unused, error, writing, reading)
...... 2 bytes Total 10 bytes The prefetch management table described above is for determining the amount of data to be read in advance and the reproduction start time.

The contents of the "prefetch management table" are as follows. -The first frame number in the frame group (Gst0, Gst
N = Gst) 4 bytes • Last frame number (Glt0, Glt) in the frame group
N = Glt) 4 bytes Total frame size in frame group (Gsize)
............ 4 bytes ・ Average read data amount per second in forward direction (Gspeed) ......
………… 4 bytes ・ Average read data amount per second in the reverse direction ………………
............ 4 bytes "Gsize-Gspeed = Gsub" forward cumulative value (Gfsu
m) 4 bytes • “Gsize− (Average read data amount per second in the reverse direction)” Reverse cumulative total value 4 bytes Total 28 bytes According to the number of frames in each frame group related to the above-described look-ahead management table The read-ahead management data is arranged in the order of 1/30. The prefetch management data is configured as shown in FIGS. 9 to 11, and is always referred to when performing a reproducing operation, and is updated every time a video is recorded.

The prefetch management table is created (updated) at the time of startup of the apparatus (when the power is turned on from an off state), at the time of replacement of the media unit 6 (when switching to the magneto-optical disk driver 6a), and at the time of replacement. It is recalculated and updated in any case at the end of recording of the device.

Next, a method of calculating the amount of data buffered in the buffer memory will be described. For example, the amount of data to be read into the buffer memory from the start-up of the apparatus to the start of reproduction is calculated as follows (here, consider normal reproduction). • Fst: playback start frame number • Gnum: frame group number to which Fst belongs • Gsto: first frame number in the frame group to which Fst belongs • Glto: end frame number in the frame group to which Fst belongs • Flast: playback end frame number Glast: Frame group number to which Flast belongs. GstN: First frame number in the frame group to which Flast belongs. GltN: Last frame number to the frame group to which Flast belongs. Gsize (m): Total size of frames in the frame group. m): Average data transfer amount per second in the forward direction within the frame group Gsub (m): Gsize (m)-Gspeed (m) Gfsum (m): Forward cumulative value of Gsub (m) Fsize (m ): Each frame size ・ m: Positive number, the amount of data to be read by the time playback starts Determined as.

First, the forward total value Gfsum of Gsub (m) in the frame group to which the reproduction start frame belongs.
(M) is calculated (shown in FIGS. 8 and 10). Bseg1, which is the result of this calculation, is

[0020]

(Equation 1) Becomes

Next, the forward total value Gfsum of Gsub (m) in the frame group to which the reproduction end frame belongs.
(M) is calculated (shown in FIGS. 8 and 11). Bseg2, which is the result of this calculation, is

[0022]

(Equation 2) Becomes

Therefore,

[0024]

(Equation 3)

[0025]

(Equation 4) Becomes

In this way, the sum total of the forward cumulative values Gfsum (m) of the frames in each frame group from the frame group to which the reproduction start frame belongs to the frame group to which the reproduction end frame belongs is obtained. The result of this calculation, Bmax, is

[0027]

(Equation 5) It is.

Here, when Bmax <Bmin,

[0029]

(Equation 6) When Bsize> Bmax ≧ Bmin,

[0030]

(Equation 7) When Bmax> Bsize, reproduction becomes impossible. However, Bmi
n: the minimum size Bsize to be buffered; the maximum capacity Bpre of the buffer; the data size to be read.

Also, the method according to the above-mentioned contents is applied to the reverse reproduction. Thus, by the above-described method, the time from issuing a playback instruction to displaying a playback image can be reduced as much as possible.

The information recording / reproducing apparatus according to the present invention will be described below using a moving picture recorder as an example.

As shown in FIG. 1, the moving picture recorder 1
It comprises a video processing unit 2, an audio processing unit 3, a panel unit 4, a control unit 5, a medium 6, and a data bus line 7.

The video processing unit 2 includes a decoder 2a,
It comprises an A / D converter 2b, frame memories 2c1, 2c2, compression / expansion units (compression / expansion units) 2d1, 2d2, bus interface 2e, FIFO 2f, D / A converter 2g, and encoder 2h. The audio processing unit 3 includes filters 3a and 3g, an A / D converter 3b, an ADPC
M encode / decoder 3c, bus interface 3
d, FIFO 3e, and D / A converter 3f.
The control unit 5 includes a PIO 5a, a CPU 5b, and a SCSI.
It comprises an interface 5c. The medium 6 includes a magneto-optical disk driver 6a provided as standard, a hard disk driver 6b as an expansion medium, and a semiconductor memory 6c. The data bus line 7 conforming to the VME bus standard is interconnected between the video processing unit 2, the audio processing unit 3, the control unit 5, and the semiconductor memory 6c.

Here, the data compression / expansion means of the present invention corresponds to the compression / expansion units 2d1, 2d2.

(1) First, the recording operation will be described.

From outside (for example, a video camera, a VTR, etc.), a composite video signal (composite input) of the NTSC broadcasting system or a Y /
The C component signal (Y / C input) is continuously input to the decoder 2a in the video processing unit 2 described above. The decoder 2a outputs a YUV signal obtained by performing color difference voltage conversion (YUV conversion) on the supplied video signal to an A / D converter 2b at the next stage. The A / D converter 2b uses this YU
A digital signal (YUV digital data) obtained by A / D converting the V signal is transferred to the frame memory 2c1 or 2c2 via a data distributor (not shown).
It is supplied alternately and continuously for each frame period (every 1/30 second). The frame memory 2c1 stores 1 stored here.
The YUV digital data for the frame is supplied to a compression / expansion unit 2d1 for compressing / expanding input / output data according to the JPEG standard. The compression / expansion unit 2d1 receives a key switch input from the panel unit 4 (“RECORD MODE” switch 409a to
409c, the YUV digital data for one frame is compressed at the compression ratio set by the compression ratio control signal supplied from the CPU 5b in the control unit 5 in accordance with the switching signal generated by selecting the 409c. The obtained recording compression data is output to the bus interface 2e.

Similarly, the frame memory 2c2 supplies the YUV digital data for one frame stored therein to the compression / expansion unit 2d2 having the same configuration as the compression / expansion unit 2d1. The compression / expansion unit 2d2 outputs the compressed recording data obtained by compressing one frame of YUV digital data at the same compression ratio as the compression / expansion unit 2d1, to the bidirectional bus interface 2e.

As shown in FIG.
The compression operations d1 and d2 are alternately performed every frame scanning period. The bus interface 2e is a compression / expansion device 2d
The compressed recording data supplied alternately from 1 and 2d2 is output onto the data bus line 7 via the bidirectional FIFO 2f.

The CPU 5b via the PIO 5a of the control unit 5
Switch input from the panel unit 4 (“REMO
The CPU 5b transfers the data from the video processing unit 2 to the data bus line 7 in response to the “TE” switch 402 being switched to the local state and a media selection signal for selecting the magneto-optical disk driver 6a. The operation for transferring and recording the compressed data to the magneto-optical disk driver 6a is started.

That is, the CPU 5b once fetches the above-mentioned compressed data on the data bus line 7 into its internal memory, and then sequentially reads out this compressed data from there to the SCSI interface 5c. The SCSI interface 5c converts the compressed data into a signal format conforming to the SCSI standard, and then supplies the compressed data to the magneto-optical disk driver 6a via the SCSI data line. The magneto-optical disk driver 6a converts the compressed data converted into the SCSI standard signal format into the signal format of the magneto-optical disk driver 6a itself, and sequentially records the data on the additionally recordable magneto-optical disk loaded therein. .

In this way, the above-mentioned video signal is continuously converted into a digital video signal, data is compressed, and then recorded on the magneto-optical disk.

Although the above description has been made on the case where only the magneto-optical disk driver 6a is selected and used as the medium 6, in addition to the above, the SCSI interface 5c as shown in FIG.
It is needless to say that the hard disk driver 6b can be further connected to the optical disk drive 6a and the hard disk driver 6b so that the compressed data can be recorded (copied) simultaneously or appropriately divided respectively.

Whether the magneto-optical disk driver 6a and the hard disk driver 6b are used independently or simultaneously is determined by a switch input from the panel unit 4 ("REM").
The "OTE" switch 402 is switched to a remote state, and a "media selection signal for selecting the hard disk driver 6b", which is generated by further performing an operation for specifying the expansion medium, "a magneto-optical disk driver 6a + a hard disk driver 6b" Is performed by the CPU 5b designating these media 6 in response to a "media selection signal for selecting".

Furthermore, the medium 6 can be further expanded by using the semiconductor memory 6c directly connected to the data bus line 7 without going through the control unit 5.

Further, a switch input from the panel unit 4 ("a medium selection signal for selecting the semiconductor memory 6c", "semiconductor memory 6c + magneto-optical disk driver 6
a), “Media selection signal for selecting semiconductor memory 6c + hard disk driver 6b”, “Media selection signal for selecting semiconductor memory 6c + magneto-optical disk driver 6a + hard disk driver 6b”) Is performed by the CPU 5b designating these media 6 in accordance with. By the way, for example, a two-channel stereo audio signal (L, R channel audio signal) synchronized with the external video signal is continuously input to the filter 3a in the audio processing unit 3. Filter 3a is A /
A high-frequency noise component of the audio signal which is a pre-processing of the D conversion is removed, and the band-limited audio signal is converted into an A / D signal at the next stage.
Output to converter 3b. The A / D converter 3b continuously supplies a digital audio signal (16-bit digital audio data per channel) obtained by A / D converting the band-limited audio signal to the ADPCM encoder / decoder 3c. ADPCM encoding /
The decoder 3c encodes the above-mentioned digital audio data from the A / D converter 3b by the ADPCM method,
Compressed audio data (recorded compressed data) obtained by converting one channel to 4 bits is used as a bus interface 3
Output for d. The bus interface 3d outputs the compressed data to the data bus line 7 via the bidirectional FIFO 3e.

As described above, since the "media selection signal for selecting the magneto-optical disk driver 6a" is specified, the CPU 5b transmits the compressed audio data transferred from the audio processing unit 3 onto the data bus line 7. The operation of transferring and recording the compressed video data to the magneto-optical disk driver 6a is started.

That is, the CPU 5b once takes in the compressed audio data on the data bus line 7 into a portion of the internal memory other than the portion for storing the compressed video data, and then sequentially transfers the compressed data to the SCSI interface 5c. Read for. The SCSI interface 5c converts the compressed audio data data into a signal format conforming to the SCSI standard, and then supplies the data to the magneto-optical disk driver 6a via the SCSI data line.
The magneto-optical disk driver 6a converts the compressed data converted to the SCSI standard signal format into the signal format of the magneto-optical disk driver 6a itself and sequentially records the compressed video data on the magneto-optical disk in association with the compressed video data.

In this way, the above-described two-channel stereo audio signal is continuously converted into a digital audio signal, data is compressed, and then recorded on the magneto-optical disk together with the compressed video data.

In the same manner as described above, the magneto-optical disk driver 6 is synchronized with the compressed video data.
a, the hard disk driver 6b, and the semiconductor memory 6c can of course be divided or simultaneously recorded as necessary.

(2) Next, the reproducing operation will be described.

A switch input from the panel unit 4 ("REV
"SCAN" switch 414, "FWD SCAN" switch 415, "REV PLAY" switch 416,
"FWD PLAY" switch 417, "REV SL
“OW” switch 418, “FWD SLOW” switch 419, “REV STILL STEP” switch 4
20, "FWD STILL STEP" switch 42
The CPU 5b in the control unit 5 outputs a reproduction start control signal to start the reproduction operation to the magneto-optical disk driver 6a on the basis of the "reproduction selection signal" selected in step 1).

In response to this switch operation, the magneto-optical disk driver 6a starts a reproducing operation, and continuously reproduces the compressed video data and compressed audio data recorded on the magneto-optical disk in accordance with the above-mentioned switch-specific reproduction specifying operation. I do.

In this way, the reproduced compressed data obtained by reproducing the recorded compressed data is once converted from the signal format of the magneto-optical disk driver 6a itself to the signal format of the SCSI standard, and then supplied to the SCSI interface 5c via the SCSI line. Here, after being re-converted to the signal format of the moving picture recorder 1, the CPU 5b
Each part of the internal memory is captured.

Thereafter, under the control of the data reading start of the CPU 5b, the compressed data read out from the memory onto the data bus line 7 is converted by the preamble data (video and audio identification data) included in the data.
The compressed video data is taken into the bus interface 2e via the FIFO 2f in the video processing unit 2, and
The compressed audio data is stored in the IF
It is taken into the bus interface 3d via O3e.

The bus interface 2e in the video processing unit 2 simultaneously supplies the compressed data obtained from the data bus line 7 to the compression / expansion units 2d1 and 2d2. The compression / expansion unit 2d1 applies one frame of YUV digital data obtained by expanding the compressed data at the expansion rate set by the expansion rate control signal supplied at the same time as the expansion start control signal is being supplied from the CPU 5b. Output to the memory 2c1. The data decompression operation performed here is, of course, complementary to the data compression operation described above. The compression / expansion unit 2d2 expands the compressed data at the same expansion rate as the compression / expansion unit 2d1 and obtains Y for one frame.
The UV digital data is output to the frame memory 2c2. The compression / expansion units 2d1 and 2d2 alternately perform the expansion operation every frame scanning period.

The frame memories 2c1 and 2c2 store one frame of YUV digital data stored in
Are supplied alternately to the / A converter 2g. The D / A converter 2g converts the YUV digital data into a YUV
The signal is output to the encoder 2h. Encoder 2
h is the composite video signal obtained by YUV inverse conversion and Y
/ C signal is output.

Thus, the composite video signal and the Y / C signal of the NTSC broadcasting system can be continuously reproduced.

As described above, the compressed audio data read onto the data bus line 7 by the data read control of the CPU 5b is transmitted to the FI
The data is taken into the bus interface 3d via the FO 3e.

The bus interface 3d in the audio processing unit 3 supplies the above-described compressed data obtained from the data bus line 7 to the ADPCM encoder / decoder 3c. ADPCM encode / decoder 3c is C
While the decoding operation start control signal is being supplied from the PU 5b, the 4-bit compressed audio data is decoded into 16-bit digital audio data. The decoding operation performed here is, of course, complementary to the above-described encoding operation.

The ADPCM encoder / decoder 3c is 1
D / A converter 3 converts 6-bit digital audio data
f. The D / A converter 3f outputs a 2-channel stereo audio signal obtained by D / A converting the digital audio data to the filter 3g. The filter 3g outputs a two-channel stereo audio signal obtained by removing a high-frequency noise component generated at the time of the D / A conversion.

As described above, the composite video signal, the Y / C signal, and the data-compressed 2-channel stereo audio signal, which are recorded after being compressed, can be continuously reproduced in synchronization.

Although not described in detail here, the compressed video data and the compressed audio data divided or simultaneously recorded as necessary in the magneto-optical disk driver 6a, the hard disk driver 6b, and the semiconductor memory 6c are as described above. Of course, it can be reproduced similarly.

Here, the above-described compression / expansion units 2d1, 2d
2 describes that the switching operation is performed alternately every frame period.

Even if a color still image is compressed by one compression / decompression device using the same level parameter (hereinafter, referred to as a Q factor) by the algorithm of the JPEG standard, the capacity of the compressed data sequentially generated according to the image pattern is reduced. There will be a considerable difference.

For this reason, the Q factor is predicted so that there is no difference in the amount of compressed data generated successively and continuously.
Adaptive control of the Q factor at the time of compression is performed by setting a constant Q table.

However, it is impossible to change the Q factor again and perform compression processing on the compressed data once compressed because the processing time becomes long.

Therefore, the control of the Q factor is performed by a method of determining the Q factor in the next one frame period in the immediately preceding one frame period. By the way, the writing of the Q table to the compression / expansion unit needs to be completed within the immediately preceding one frame period. Therefore, it takes time to take in the image data to be compressed, perform the compression process, and further rewrite the Q table. I can not afford to.

From the above, the compression / expansion units 2d1, 2d
2 are used, and the switching operation is performed alternately every one frame scanning period.

As shown in FIG. 2A, the first compression / expansion unit 2d1 performs compression processing within the n-th one frame period.
If it is necessary to change the compression ratio, after rewriting the Q table within the (n + 1) -th one frame period, (n + 2)
Perform compression processing within the first one frame period,
Q table rewriting is performed alternately in units of one frame period.

The second compression / expansion unit 2d2 rewrites the Q table during the n-th one-frame period and performs the compression process within the (n + 1) -th one-frame period, as shown in FIG. After performing the above, Q within the (n + 2) th one frame period
Table rewriting is performed, and Q table rewriting and compression processing are alternately performed in units of one frame period. FIG. 3C shows a vertical synchronizing signal waveform.

As described above, the compression / expansion units 2d1, 2d2
Performs the compression process and the Q table rewriting operation complementarily within the same one frame period. Similarly, the compression / expansion device 2d
In 1 and 2d2, the expansion process and the Q table rewriting operation are performed complementarily within the same one frame period.

Thus, the plurality of compression / expansion units 2d1, 2d
By using 2, it is possible to perform real-time moving image compression recording and control to variably control the Q factor which is a compression parameter to keep the compression ratio constant.

Further, since the plurality of compression / expansion units 2d1 and 2d2 are switched and used for each frame scanning period,
A moving image recording (reproducing) mode (for example, 512 × 480 maximum processing pixels per frame) for continuously compressing and recording (expanding and reproducing) moving images in a frame scanning period, or a moving image in one field scanning period A moving image recording (playback) mode in which compression recording (expansion playback) is performed continuously (for example,
(Maximum number of processing pixels per field: 512 × 240)
Both modes are available.

Further, here, the compression / expansion units 2d1 and 2d2 are switched every frame scanning period. For example, the compression / expansion unit 2d1 performs compression recording (expansion reproduction) of the upper half of each color still image to be processed. In addition, the compression / expansion device 2d2 can be easily used for compression recording (expansion reproduction) of the lower half thereof.

Further, the compression / expansion unit 2d1,
By using a number of compression / decompression devices having the same configuration as 2d2 in parallel,
Since each color still image to be processed is divided into a plurality of blocks and can be processed in parallel, it is possible to support HDTV. For example, the first compression / expansion unit performs compression recording (expansion reproduction) of the uppermost part of each color still image to be processed when the color still image is horizontally divided into four, and the second compression / expansion unit compresses the lower part. For recording (expansion reproduction), the third compression / expansion apparatus further performs compression recording (expansion reproduction) of the lower part, and the fourth compression / expansion apparatus performs compression recording (expansion reproduction) of the lowest part of the image.
Any configuration may be used as long as it is used for each.

FIG. 3 is a time chart for starting the operation of the recording data transfer process.

When the “REC” switch 412 is pressed,
As a result, the CPU 5b accepts the start of recording data transfer (REC acceptance) and outputs various control signals to the video processing unit 2 and the audio processing unit 3 to perform the following operations.

That is, the frame memory 2c1 is output from the A / D converter 2b in synchronization with the fall t1 of the vertical synchronizing signal (V signal) (shown in FIG. 7A) immediately after receiving the REC. First, the capture of digital data for the first frame is started (“FM capture” shown in FIG. 3B).

At the same time, the ADPCM encoder / decoder 3c outputs the first 1 output from the A / D converter 3b.
Data compression of digital audio data for a frame is started (“recording” shown in FIG. 3D). Thereafter, the data fetched into the frame memory 2c1 is read out to the compression / expansion unit 2d1 in synchronization with the next fall t2 of the V signal ("FM readout" shown in FIG. 2B), and received. The compressor / decompressor 2d1 sequentially starts data compression processing ("COMP" shown in FIG. 3B), and immediately transfers the data to the CPU 5b via the bus interface 2e, FIFO 2f, and data bus line 7 after completion of data compression. (“V” shown in FIG. 9E).

The data compression of the digital audio data started in synchronization with the falling t1 of the V signal is V
The processing ends in synchronization with the falling edge t2 of the signal, and is immediately transferred to the CPU 5b via the bus interface 3d, the FIFO 3e, and the data bus line 7 ("A" shown in FIG. 11E). The CPU 5b stores the compressed video data and compressed audio data thus transferred in its internal memory (for example, a dual port RAM).

Thus, after the recording operation starts, the compressed video data and compressed audio data for the first one frame are stored in the internal memory of the CPU 5b ("the end of the writing of the first one frame" shown in FIG. 8E). .

The frame memory 2c2 starts taking in the next one frame of digital data output from the A / D converter 2b in synchronization with the falling t2 of the V signal (see FIG. 9C). Illustrated “FM uptake”). At the same time, the ADPCM encode / decoder 3
c starts data compression of the next one frame of digital audio data output from the A / D converter 3b ("recording" shown in FIG. 3D).

Thereafter, the data fetched into the frame memory 2c2 is read out to the compression / expansion unit 2d2 in synchronization with the next falling edge t3 of the V signal (“F” shown in FIG.
M reading ”), and in response to this, the compression / expansion unit 2d2 sequentially starts data compression processing (“ CO ”shown in FIG.
MP)), and after the data compression is completed, the data is immediately transferred to the CPU 5b ("V" shown in FIG. 11E).

The data compression of the digital audio data started in synchronization with the falling t2 of the V signal is V
The process ends in synchronization with the falling edge t3 of the signal, and is immediately transferred to the CPU 5b in synchronization with the end of the transfer of the first one frame of compressed data to the CPU 5b (FIG. 10E).
"A" shown in FIG. The CPU 5b stores the transferred compressed video data and compressed audio data in its internal memory.

Thus, the next one following the first one frame
The compressed video data and compressed audio data for the frame are stored in the internal memory of the CPU 5b (FIG. 10E).
"End of next frame writing" shown in FIG.

As described above, after the start of the recording operation, the above-described recording operation is alternately repeated every frame period.

FIG. 4 is a time chart showing the end of the recording data transfer process operation.

When the "STOP" switch 413 is pressed while the recording data is being transferred, the CPU 5b accepts the end of the recording data transfer (R
ECSTOP), and outputs various control signals to the video processing unit 2 and the audio processing unit 3 to perform the following operations.

That is, the frame memory 2c1 synchronizes with the falling t9 of the V signal (shown in FIG. 7A) immediately after the reception of the REC STOP and the A / D in synchronization with the falling t8 of the V signal. The last one already captured from the converter 2b (“FM capture” shown in FIG. 2B)
The digital data corresponding to the frame is output to the compression / decompression device 2d1 (“FM reading” illustrated in FIG. 3B).

Thereafter, the frame memories 2c1, 2c2
Becomes inoperative. The ADPCM encoder / decoder 3c starts the compression in synchronization with the fall t8 of the V signal and ends the compression in synchronization with the fall t9 of the V signal ("recording" shown in FIG. 3D). The audio data is transferred to the CPU 5b in synchronization with the end of the transfer of the compressed video data from the compressor / decompressor 2d2 to the CPU 5b ("V" shown in FIG. 10E) ("A" shown in FIG. 10E). )). The compression / expansion unit 2d1 sequentially starts the compression processing of the data read from the frame memory 2c1 (“COMP” shown in FIG. 3B), and after the data compression is completed, transfers the compressed video data to the CPU 5b. Thereafter, the compression / decompression devices 2d1 and 2d2 do not operate. CPU
5b stores the transferred compressed video data and compressed audio data in the internal memory.

Thus, even if the recording operation is stopped halfway, the recording operation is continued until the last one frame of the compressed video data and the compressed audio data is stored in the internal memory of the CPU 5b (see FIG. 10E). "Last frame write end" in the figure).

FIG. 5 is a time chart for starting the operation of the reproduction data transfer process.

For example, “FWD PLAY” switch 4
When the button 17 is pressed, the CPU 5b accepts the start of reproduction data transfer (PLAY acceptance), and outputs various control signals to the video processing unit 2 and the audio processing unit 3 to perform the following operations. That is, in synchronization with the fall t10 of the V signal immediately after the reception of the PLAY, the internal memory of the CPU 5b, the data bus 7, and the FIFO
2f, and the compressed video data reproduced (“V” shown in FIG. 9E) via the bus interface 2e.
This is supplied to d1 ("pressure de" shown in FIG. 4B).

In response to this, the compression / expansion unit 2d1 sequentially starts the expansion processing of the compressed video data in synchronization with the fall t11 of the V signal (see “DECOM” in FIG.
P "), and writes the expanded digital video data into the frame memory 2c1 (" FM writing "shown in FIG. 3B).

Thereafter, the frame number corresponding to the digital video data written in the frame memory 2c1 in synchronization with the falling t12 of the V signal is displayed in the "FRAME COUNTER" 4b for one frame period (FIG. B) "FM display" shown). At the same time,
The digital data written in the frame memory 2c1 is output as a composite video signal or a Y / C signal via a D / A converter 2g and an encoder 2h.

The compressed audio data (“A” shown in FIG. 10E) is transmitted via the internal memory of the CPU 5b, the data bus 7, the FIFO 2f, and the bus interface 2e.
Is supplied to the ADPCM encoder / decoder 3c in synchronization with the fall t11 of the V signal, where the data of the compressed audio data is expanded, and then the D / A converter 2g is synchronized with the fall t12 of the V signal. , Encoder 2h
, A 2-channel stereo audio signal is output (“playback (sound)” shown in FIG. 3D).

When the "FWD PLAY" switch 417 is pressed in this way, a composite video signal or Y / C signal for the first frame and a two-channel stereo audio signal are output in synchronization.

The compressor / decompressor 2d2 sequentially starts the decompression processing of the compressed video data in synchronization with the fall t12 of the V signal ("DECOMP" shown in FIG. 10C), and outputs the decompressed digital video data. To the frame memory 2c2
(“FM writing” shown in FIG. 3C).

Thereafter, the frame number corresponding to the digital video data written in the frame memory 2c2 in synchronization with the falling t13 of the V signal is displayed in the "FRAME COUNTER" 4b for one frame period (FIG. “FM display” shown in C)). At the same time,
The digital data written in the frame memory 2c2 is output as a composite video signal or a Y / C signal via a D / A converter 2g and an encoder 2h.

The compressed audio data (“A” shown in FIG. 10E) supplied from the internal memory of the CPU 5b is AD synchronized with the falling t12 of the V signal.
The compressed audio data is supplied to the PCM encoder / decoder 3c, where the compressed audio data is expanded, and then synchronized with the falling edge t13 of the V signal via the D / A converter 2g and the encoder 2h to output 2-channel stereo audio data. A signal is output ("reproduction (sound)" shown in FIG. 4D).

Thus, the next 1 following the first 1 frame
Composite video signals or Y / C signals for two frames and two-channel stereo audio signals are output in synchronization.

As described above, after the "FWD PLAY" switch 417 is pressed, the above-described reproduction operation is alternately repeated every frame period.

Here, the start of reproduction data transfer by the push-button operation of the “FWD PLAY” switch 417 has been described. However, the present invention is not limited to this. The “REV SCAN” switch 414, the “FWD SCAN” switch 415, and the “R
EV PLAY ”switch 416,“ REV SLO
W ”switch 418,“ FWD SLOW ”switch 4
19. "REV STILL STEP" switch 42
0, “FWD STILL STEP” switch 421
Of course, the reproduction data can be transferred according to the designation of each switch.

FIG. 6 is a time chart showing the end of the operation of the reproduction data transfer process.

When the "STOP" switch 413 is pressed while the reproduction data is being transferred, the CPU 5b accepts the end of the reproduction data transfer (S5).
TOP), and outputs various control signals to the video processing unit 2 and the audio processing unit 3 to perform the following operations.

That is, V immediately after STOP is accepted
Decompression processing of reproduced compressed video data (“compression data” shown in FIG. 2B) already supplied to the compression / expansion unit 2d1 in synchronization with the fall t17 of the signal (shown in FIG. 2A). Are sequentially started (“DECOM” shown in FIG.
P "), and writes the expanded digital video data into the frame memory 2c1 (" FM writing "shown in FIG. 3B).

Thereafter, the frame number corresponding to the digital video data written in the frame memory 2c1 in synchronism with the fall t18 of the V signal is displayed in the "FRAME COUNTER" 4b for one frame period (FIG. B) "FM display" shown).

Thereafter, the frame memories 2c1 and 2c2
Becomes inoperative. At the same time, the frame memory 2c1
Is written as a composite video signal or a Y / C signal via a D / A converter 2g and an encoder 2h. Thereafter, the compression / decompression devices 2d1 and 2d2 do not operate.

The compressed audio data (see FIG.
Is supplied to the ADPCM encoder / decoder 3c in synchronization with the fall t17 of the V signal,
Here, after the compressed audio data is expanded,
The D / A converter 2 is synchronized with the falling t18 of the V signal.
g, 2 channel stereo via encoder 2h
An audio signal is output ("reproduction (sound)" shown in FIG. 3D). Thereafter, the ADPCM encode / decoder 3c becomes inactive.

When the "STOP" switch 413 is pressed in this way, the reproduction operation is continued until the final composite video signal of one frame or Y / C signal or 2-channel stereo audio signal is output in synchronization.

As described above, the composite video signal or the Y / C signal of the last frame or the two-channel stereo audio signal can be completely reproduced even if the reproduction data is stopped during transfer.

The operation of controlling the recording / reproducing operation of the moving image recorder 1 is an input operation from the panel unit 4 shown in FIG.

As shown in the figure, when the "POWER" switch 401 provided on the front panel 4a is pressed, the power of the moving picture recorder 1 is turned on, and the LED in the switch is turned on. When the button is pressed again, the power of the moving image recorder 1 is turned off, and the LED in the switch is turned off.

The "REMOTE" switch 402
Switch between Mote and Local. In the local state (the LED in the switch is turned off), the moving image recorder 1
Input operation from the front panel 4a becomes effective. In the remote state (the LED is turned on), remote operation from outside the moving image recorder 1 by the communication module RS232C becomes possible, and by input operation of various switches described later, for example, the moving image is transmitted via the communication module RS232C. Data can be exchanged between the recorder 1 and an extended medium such as an external magneto-optical disk driver, hard disk driver, or semiconductor memory.

When the "EJECT" switch 403 is pressed, for example, the aforementioned magneto-optical disk driver 6a
You can eject the disc stored in the.

When the "FORMAT" switch 404 is depressed once, it enters a format start ready state, and the LED in the switch flashes. When the button is pressed again, the physical format and the logical format are executed. When any other switch is pressed in the format start ready state, the LED in the switch is turned off from the blinking state and the format start ready state is released.

When the "DISPLAY" switch 405 is pressed, the LED in the switch is turned on.
The nine-digit “FRAME COUNTER” 4b and the three-digit “CHAPTER” 4c can be respectively displayed on a monitor (not shown) connected to the video recorder 1. The "FRAME COUNTER" 4b displays the frame number added to the video image in the order of minutes (M), seconds (S), and frames (F). "CHAPTER" 4c is "CHAPTER" 0 "
Displays the chapter number specified by the ".about." 9 "ten key 422.

The “CH1 / CH2 INPUT level” adjusters 406a and 406b adjust the recording levels of the L and R channels of the two-channel stereo audio signal supplied to the moving picture recorder 1, respectively.

"PEAK / LEVEL INDICAT"
OR "406c, 406d is the volume 406a, 40
The peak levels of the L and R channels adjusted in 6b are displayed.

“HEAD PHONE OUT” terminal 4
Reference numeral 07 is used to monitor audio signals during recording and reproduction by connecting headphones here. "HEA
DPHONE LEVEL ”volume 408 is connected to terminal 4
07 output level is adjusted.

"RECORD MODE" switch 40
9a, 409b, and 409c are used to select an image quality mode at the time of recording, and a "HIGH" switch 409a has the lowest compression ratio of the above-described compressed video signal, and "LOW".
The switch 409c has the highest compression ratio and “NOR
The "M" switch 409c is a standard compression ratio. Each of the selected switches 409a to 409c turns on an internal LED.

The “ERASE” switch 410 has been previously set to “CHAPTER“ 0 ”to“ 9 ””
If any one of the buttons 2 is designated as a push button, and then the button is pushed, the erase ready state is set and the LED in the switch 410 blinks. In this state, if the numeric key 422 other than the one that was previously specified is pressed again, the erase ready state is released, and the LED changes from the blinking state to the extinguished state. In the erase ready state, the "ER
When the "ASE" switch 410 is pressed again, the compressed data corresponding to the chapter number previously specified by the numeric keypad 422 can be erased (compressed data is divided and recorded for each chapter on the aforementioned magneto-optical disk). There).

When the chapter number is cleared (“CHA
Press the PTER “C” clear key 423
When each number display of "CHAPTER" 4c is blank), when the "ERASE" switch 410 is pressed twice, the entire magneto-optical disk is erased.

"C-REC (CHAPTER-RE)
The “C)” switch 411 is a switch for recording compressed data on the chapter number erased by the “ERASE” switch 410 described above. When recording the compressed data longer than the compressed data time of the erased chapter number, the recording is automatically stopped immediately before the next chapter. When recording, L in switch 411
The ED is turned on, and the switch 411 is locked when recording to the designated chapter number is in progress.

A “REC” switch 412 is a switch for recording an input video signal (input image).
The LED in the switch 412 is in a lighting state. Recording by this key switch is additionally recorded after the last chapter.

A "STOP" switch 413 is a switch for stopping the operation. The monitor output in the stopped state is an EE output that outputs the input image as it is when there is an input image.
If not, use a gray image.

The "REV SCAN" switch 414 is
"REV PLAY" switch 416 or "REV
SLOW ”switch 418,“ REV STILL ”
When the push button is pressed during the operation of the "STEP" switch 420, the LED in the switch is turned on, and the reverse reproduction is performed at the quadruple speed from that point. When this switch is pressed from the stop state, reverse playback is performed at quadruple speed from the end of the specified chapter.

The "FWD SCAN" switch 415 is
"FWD PLAY" switch 417 or "FWD PLAY"
SLOW ”switch 419,“ FWD STILL ”
When the button is pressed during the operation of the "STEP" switch 421, the LED in the switch is turned on, and the reproduction is performed at the quadruple speed from that point. When this switch is pressed from the stop state, the reproduction is performed at a quadruple speed from the start of the designated chapter.

The "REV PLAY" switch 416 is
"REV SCAN" switch 414 or "REV SCAN"
SLOW ”switch 418,“ REV STILL ”
When the button is pressed during the operation of the "STEP" switch 420, the LED in the switch is turned on, and the reverse playback is performed at the standard speed from that point. When this switch is pressed from the stop state, reverse playback is performed at the standard speed from the end of the specified chapter.

The "FWD PLAY" switch 417 is
“FWD SCAN” switch 415 or “FWD SCAN”
SLOW ”switch 419,“ FWD STILL ”
When the button is pressed during the operation of the "STEP" switch 421, the LED in the switch is turned on, and the reproduction is performed at the standard speed from that point. When this switch is pressed from the stop state, the reproduction is performed at the standard speed from the start of the designated chapter.

The “REV SLOW” switch 418 is
"REV SCAN" switch 414 or "REV SCAN"
PLAY "switch 416," REV STILL "
When the button is pressed during the operation of the "STEP" switch 420, the LED in the switch is turned on, and the slow reproduction in the reverse direction is performed from that point. When this switch is pressed from the stop state, slow reproduction in the reverse direction is performed from the end of the specified chapter.

The "FWD SLOW" switch 419 is
“FWD SCAN” switch 415 or “FWD SCAN”
PLAY "switch 417," FWD STILL "
When the button is pressed during the operation of the "STEP" switch 421, the LED in the switch is turned on, and the slow reproduction in the forward direction is performed from that point. When this switch is pressed from the stop state, slow reproduction in the forward direction is performed from the start of the designated chapter.

The “REV STILL STEP” switch 420 includes a “REV SCAN” switch 414, a “REV PLAY” switch 416, and a “REV
When the button is pressed during the operation of the "SLOW" switch 418, the LED in the switch is turned on, and from that point of time, the mode is set to the reverse frame forward (still) mode. Each time the switch is pressed, frame-by-frame playback is performed one frame at a time in the reverse direction. When this switch is pressed from the stop state, the frame is set to the reverse frame forward mode from the end of the designated chapter.

The “FWD STILL STEP” switch 421 includes a “FWD SCAN” switch 415, a “FWD PLAY” switch 417, and a “FWD PLAY” switch 417.
When the button is pressed during the operation of the "SLOW" switch 419, the LED in the switch is turned on, and from that point of time, the mode is set to the forward frame forward (still) mode. 1 each time the switch is pressed
Frame forward playback is performed in the forward direction frame by frame. When the switch is pressed from the stop state, the mode is set to the forward frame forward mode from the start of the designated chapter.

The “CHAPTER“ 0 ”to“ 9 ”” numeric keys 422 are used to designate a chapter number. "CHAPTER" C "" clear key 42
3 can clear the chapter number designated by the ten key 422 by pressing this button.
When this button is pressed, the number display of “CHAPTER” 4c becomes blank. "CHAPTER" SARC
The "H""key 424 locates the specified chapter number. When the standby is completed after the search, the LED in the switch is turned on.

As described above, the recording / reproducing operation of the moving picture recorder 1 can be controlled by various input operations from the panel unit 4.

The operation recorder 1 having the above configuration is
For example, it can be applied to fields such as video motion analysis, sports replay, and security.

[0139]

As described above, the information recording / reproducing apparatus according to the present invention outputs recorded / compressed data obtained by compressing a digital video signal according to the JPEG standard and reproduces / compresses the recorded / compressed data. Data compression / expansion means for outputting the digital video signal obtained by decompressing the data according to the JPEG standard, and a change in the data transfer amount due to the recording compression data in which the data compression ratio varies according to the subject related to the digital video signal. Temporary storage means for temporarily storing the reproduced compressed data so as to be absorbed, so that a large amount of data can be stored on a recording medium having an extremely low transfer rate as compared with a conventional information recording / reproducing apparatus for transferring data without compression. Since compressed data can be recorded, for example, when the present invention is applied to a video editing machine, many video scenes The recorded video tape is reproduced by the master VTR, supplied to the apparatus of the present invention, and data is compressed and temporarily recorded at a low transfer rate. At the time of editing, the compressed data is read at a low transfer rate. Only the video scene to be played can be reproduced by setting the forward direction or the reverse direction of the reproduction direction and the reproduction speed arbitrarily, so that the required video scene can be connected in a short time,
In addition, the connected video scenes can be compressed and recorded again, and the continuous video scenes can be supplied and dubbed to the slave VTR connected to the reproducing side of the apparatus of the present invention, thereby making it extremely simple and short. Video editing can be performed in time, and when a combination of a video camera and the device of the present invention is used as a correction device for correcting an athlete's form, the form captured by the video camera can be monitored instantaneously or when necessary. Depending on the tail,
Since special reproduction operations such as slow, reverse, and fast-forward can be monitored, it is extremely suitable as a correction device.
When a moving image is compressed in accordance with the JPEG standard, the compression ratio changes depending on the subject (for example, the compression ratio is low for a dark subject, and large for a whitish subject). In this reproduction, the data transfer amount changes due to the variation of the compression ratio according to the subject (for example, in the case of a dark subject, the compression ratio is large, so the data transfer amount during reproduction becomes large, and ,
(In the case of a whitish subject, the compression rate is small, so the data transfer amount during playback is small.) A change in the data transfer amount can be absorbed. For example, from when a playback start instruction is received until a playback image appears. Since the waiting time can always be minimized (immediately) irrespective of the subject, there is an effect that a recording / reproducing apparatus having extremely good operation followability can be provided.

[Brief description of the drawings]

FIG. 1 is a system block diagram of a moving picture recorder as one embodiment of an information recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram illustrating a compression operation of two compression / decompression devices.

FIG. 3 is a time chart of the start of a print data transfer process operation.

FIG. 4 is a time chart at the end of a print data transfer process operation.

FIG. 5 is a time chart at the start of a reproduction data transfer process operation.

FIG. 6 is a time chart at the end of a reproduction data transfer process operation.

FIG. 7 is a diagram illustrating an operation panel of the moving image recorder.

FIG. 8 is a diagram illustrating a prefetch management table.

FIG. 9 is a diagram showing playback start frames of frame numbers 1 to 30 in frame group number 1.

FIG. 10 is a diagram illustrating a reproduction start frame of frame numbers Gsto to Glto in a frame group number Gnum.

FIG. 11 is a diagram for explaining a reproduction start frame of frame numbers GstN to GltN in a frame group number Glast.

[Explanation of symbols]

 Reference Signs List 1 moving image recorder 2 video processing unit 3 audio processing unit 4 panel unit 5 control unit 6 media 2d1, 2d2 compression / expansion device (data compression / expansion means) 3c ADPCM decode / encoder 6a magneto-optical disk driver 6b hard disk driver 6c semiconductor memory

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 G11B 20/10-20/12 H04N 1/41-1/419 H04N 7 / 24-7/68

Claims (1)

(57) [Claims] An input image signal is converted into data in units of image frames.
Tokoro and data compression means for outputting the compressed compressed data, the compressed data output from the data compression means
Image frame group, which is a set of constant image frames
Recorded in units and recorded in image frame groups
Using a predetermined data transfer amount
Data recording / reproducing means for reproducing as compressed data to be reproduced
And the reproduced compressed data output from the data recording / reproducing means.
Output image in which data is expanded in a complementary manner to data compression
An information storage device having data expansion means for outputting as an image signal
In the recording / reproducing apparatus, the compressed data output from the data compression means is
When recording on the data recording / reproducing means, the predetermined data
Of the compressed data for each image frame with respect to the data transfer amount.
The difference data amount of the data amount is recorded as difference data information.
When the difference data information recording means and the image reproduction start are instructed, the reproduction is instructed.
The reproduction pressure over the entire image frame group for the image
Compressed data is transmitted from the data recording / reproducing means to the data expansion
Prior to being output to the
Of the difference data amount related to the difference data information
Buffering data from the data recording / reproducing means
Read and temporarily from the first address to the second address
Buffer means for recording, and the buffering data being temporarily stored in the buffer means.
When recorded, the data is expanded from the buffer
From the first address to the buffering data.
The data recording / reproducing means
Immediately after the second address with respect to the buffer means
Before the entire image frame group from the address
The buffer is set so as to start outputting the playback / compression data.
Controlling each operation of the data recording / reproducing means and the data recording / reproducing means.
Having the control means, the image whose reproduction is instructed
Interrupting the output image signal of the image frame group according to
An information recording / reproducing apparatus for reproducing without performing .