JPH05284455A - Information recording device - Google Patents

Abstract

PURPOSE:To attain high density recording of video signals or the like in which very fine patterns are consecutive for a long time stably without missing at all times by applying variable control to a compression parameter of a data compression means so that a recording data transfer rate of a recording means is not exceeded. CONSTITUTION:Companders 2d1, 2d2 implement complementarily compression processing and Q table rewrite for a same frame period. Furthermore, they predict a Q factor so that no difference takes place in the compressed data quantity depending on a pattern of a picture and set a Q table to implement adequate control of the Q factor. Then the Q factor of the companders 2d1, 2d2 being data compression means is subject to variable control in response to the information quantity of a digital video signal so that a recording data transfer rate of a medium 6 (a magneto-optical disk driver 6a, a hard disk driver 6b and a semiconductor memory 6c) being a recording means is not exceeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, JPEG (Joint Photographic Exp) as a color still image encoding system.
ert Group) standard digital video signal and AD
The present invention relates to an information recording device relating to a video disc recorder capable of continuously recording a digital audio signal compressed by a PCM (Adaptive Differential PCM) system in a disc device such as an optical disc or a hard disc, or a semiconductor memory in continuous synchronization. is there.

[0002]

2. Description of the Related Art Conventionally, a digital video signal compressed by the JPEG standard and a digital audio signal compressed by the ADPCM system are continuously recorded in a disk device such as an optical disk or a hard disk, or a semiconductor memory, and recorded in them. There is a video disc recorder which reproduces the reproduced data and reproduces the digital video signal expanded by the JPEG standard and the digital audio signal expanded by the ADPCM system in continuous synchronization.

[0003]

In the above-mentioned video disc recorder, particularly, the compressor for performing data compression changes the video image to be data-compressed (for example, the entire image is a single color or the entire image is a fine pattern). As a result, the compression rate changes according to the change of the video image for each frame (for example, a single color image is data compressed at a high compression rate, and a fine pattern image is data compressed at a low compression rate). As a result, if the data compression continues at a low compression rate, such recorded compressed data transferred from this compressor at a high transfer rate is recorded on a recording medium such as a disk device or a semiconductor memory (hereinafter referred to as recording means). If the respective recording data transfer rates in (1) are exceeded, there is a problem that recording is lost after that.

[0004]

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

The recording means comprises data compression means for outputting recording compression data obtained by data compression of a digital video signal according to the JPEG standard, and recording means for recording the recording compression data output from the data compression means. An information recording apparatus, wherein the compression parameter of the data compression means is variably controlled so as not to exceed the recording data transfer rate in.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An information recording apparatus according to the present invention will be described below with reference to FIGS.
It will be described with reference to FIG.

FIG. 1 is a system block diagram of a moving image recorder, FIG. 2 is a diagram for explaining the compression operation of two compression / expansion devices, FIG. 3 is a time chart of the operation start of a recording data transfer process, and FIG. 4 is a recording data transfer. 5 is a time chart for starting the reproduction data transfer process, FIG. 6 is a time chart for ending the reproduction data transfer process operation, FIG. 7 is a diagram for explaining the operation panel of the moving image recorder, and FIG. FIG. 9 is a diagram for explaining the relationship between the Q factor of the compression / expansion device and the compressed data file size, and FIG.
FIG. 10 is a diagram for explaining the relationship between the reciprocal of the factor and the compressed data file size, and FIG. 10 is a diagram for explaining the method for determining the Q factor.

The moving picture recorder 1 is, as shown in FIG.
It is composed of 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 above video processing unit 2 includes a decoder 2a,
A / D converter 2b, frame memories 2c1 and 2c2, compression / expansion devices 2d1 and 2d2, bus interface 2e,
It is composed of a FIFO 2f, a D / A converter 2g, and an encoder 2h. The audio processing unit 3 described above is a filter 3
a, 3g, A / D converter 3b, ADPCM encoding /
Decoder 3c, bus interface 3d, FIFO3
e, D / A converter 3f. The control unit 5 described above includes a PIO 5a, a CPU 5b, and a SCSI interface 5c. The above-mentioned medium 6 is a standard-equipped magneto-optical disk driver 6a, a hard disk driver 6b as an expansion medium, and a semiconductor memory 6c.
Composed of. The data bus line 7, which is a VME bus standard, includes the video processing unit 2, the audio processing unit 3, and
The control unit 5 and the semiconductor memory 6c are interconnected.

The data compression means of the present invention corresponds to the compression / expansion devices 2d1 and 2d2, and the recording means corresponds to the medium 6 (magneto-optical disk driver 6a, hard disk driver 6b, semiconductor memory 6c).

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

An external (for example, video camera, VTR, etc.) composite video signal of NTSC broadcasting system (composite input) or Y / separated into luminance / color signals.
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 color difference voltage conversion (YUV conversion) of these supplied video signals to the A / D converter 2b at the next stage. The A / D converter 2b is this YU
A digital signal (YUV digital data) obtained by A / D converting the V signal is sent to the frame memory 2c1 or the frame memory 2c2 by 1 via a data distributor (not shown).
Each frame period (every 1/30 second) is alternately supplied continuously. The frame memory 2c1 is stored here 1
The YUV digital data for the frame is supplied to the compression / expansion unit 2d1 which compresses / expands the input / output data according to the JPEG standard. The compression / expansion device 2d1 receives a key switch input from the panel unit 4 (“RECORD MODE” switch 409a ...
In accordance with a switching signal generated by selecting 409c), the YUV digital data for one frame is compressed at the compression rate set by the compression rate control signal supplied from the CPU 5b in the control unit 5. The obtained recording compressed 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 device 2d2 having the same structure as the compression / expansion device 2d1. The compression / expansion unit 2d2 outputs the recording compression 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. 2, which will be described later, the compression / expansion units 2d1 and 2d2 alternately perform compression operations every frame period. The bus interface 2e outputs the recording compressed data alternately supplied from the compression / expansion units 2d1 and 2d2 onto the data bus line 7 via the bidirectional FIFO 2f.

CPU 5b via PIO 5a of control unit 5
Switch input from the panel unit 4 ("REMO
In response to a media selection signal indicating that the magneto-optical disk driver 6a is generated by switching the "TE" switch 402 to the local state, the CPU 5b transfers the data from the video processing unit 2 to the data bus line 7. The operation of transferring and recording the compressed data thus selected to the magneto-optical disk driver 6a is started.

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

In this way, the above 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 this, in order to expand the medium 6, as shown in the figure, the SCSI interface 5c described above is used.
It is needless to say that the hard disk driver 6b is further connected to and the compressed data can be simultaneously (and appropriately divided) recorded (copied) by using the magneto-optical disk driver 6a and the hard disk driver 6b.

Whether the magneto-optical disk driver 6a and the hard disk driver 6b are used independently or at the same time is determined by a switch input ("REM") from the panel unit 4.
“Media selection signal for selecting hard disk driver 6b”, which is generated by switching the “OTE” switch 402 to a remote state and further specifying an expansion medium, “magneto-optical disk driver 6a + hard disk driver 6b” The CPU 5b designates these media 6 in response to a "media selection signal".

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

Furthermore, switch input from the panel section 4 ("media selection signal for selecting semiconductor memory 6c", "semiconductor memory 6c + magneto-optical disk driver 6")
"Media selection signal for selecting 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") The CPU 5b designates these media 6 in accordance with the above. By the way, for example, a 2-channel stereo audio signal (L and R channel audio signals) synchronized with the video signal from the outside is continuously input to the filter 3a in the audio processing unit 3. Filter 3a is A /
The high-frequency noise component of the audio signal, which is the pre-processing of D conversion, is removed and the band-limited audio signal is converted to the next stage A / D
It outputs to the converter 3b. The A / D converter 3b continuously supplies a digital audio signal (16-bit digital audio data per one 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 digital audio data from the A / D converter 3b by the ADPCM method,
Compressed audio data (recorded compressed data) obtained by converting 4 bits per channel to bus interface 3
Output to d. The bus interface 3d outputs this 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 designated, the CPU 5b outputs 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 temporarily takes in the compressed audio data on the data bus line 7 to a portion of its internal memory other than the portion for storing the compressed video data, and then sequentially outputs this compressed data to the SCSI interface 5c. To read. The SCSI interface 5c converts this compressed audio data data into a signal format of the SCSI standard, and then supplies it 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 signal format of the SCSI standard into the signal format of the magneto-optical disk driver 6a itself and sequentially records it on the magneto-optical disk in association with the compressed video data.

In this way, the above-mentioned 2-channel stereo audio signal is continuously converted into a digital audio signal, data is compressed, and then recorded on a magneto-optical disk together with compressed video data.

Further, similarly to the above, the magneto-optical disk driver 6a, the hard disk driver 6b, and the semiconductor memory 6 are synchronized with the compressed compressed video data.
It is needless to say that c can be divided or can be recorded simultaneously with this as required.

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

Switch input from the panel section 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 controller 5 outputs a reproduction start control signal to the effect that the reproduction operation is started to the magneto-optical disk driver 6a based on the "reproduction selection signal" selected by 1).

In response to the switch operation, the magneto-optical disk driver 6a starts the reproducing operation, and the compressed video data and the compressed audio data recorded on the magneto-optical disk are continuously reproduced in accordance with the above-mentioned reproduction designating operation peculiar to the switch. To do. In this way, the reproduced compressed data is temporarily transferred from the signal format of the magneto-optical disk driver 6a to the SC.
After being converted to SI standard signal format, SCSI
It is supplied to the SCSI interface 5c via a line, where it is re-converted into the signal format of the moving picture recorder 1 and then taken into each part of the memory inside the CPU 5b.

Thereafter, the compressed data read out from the memory onto the data bus line 7 is controlled by the data read start control of the CPU 5b by the preamble data (video, audio identification data) included in this 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 the FIF in the audio processing unit 3.
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 frames one frame of YUV digital data obtained by expanding the compression data at the expansion rate set by the expansion rate control signal simultaneously supplied while the expansion start control signal is 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 device 2d2 expands the compressed data at the same expansion ratio as the compression / expansion device 2d1 to obtain Y for one frame.
The UV digital data is output to the frame memory 2c2. The compression / expansion devices 2d1 and 2d2 alternately perform the expansion operation for each frame period.

The frame memories 2c1 and 2c2 respectively store the YUV digital data for one frame stored in each frame.
Alternately supplied to the / A converter 2g. The D / A converter 2g is a YUV obtained by D / A converting this YUV digital data.
The signal is output to the encoder 2h. Encoder 2
h is a composite video signal obtained by inverse YUV conversion and Y
/ C signal is output.

In this way, the NTSC broadcast composite video signal and Y / C signal can be continuously reproduced.

As described above, the compressed audio data read on the data bus line 7 by the data read control of the CPU 5b is FI in the audio processing unit 3.
It is taken into the bus interface 3d through the FO 3e.

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

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

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

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

Here, the alternate use of the compression / expansion devices 2d1 and 2d2 during the recording / reproducing operation described above will be described.

According to the JPEG standard algorithm, even if the color still image is data-compressed by one compression / expansion device with the same level parameter (hereinafter referred to as Q factor), the volume of the compressed data sequentially generated by 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 that is successively generated.
A Q table that is a constant is set to perform adaptive control of the Q factor during compression.

However, it is not possible to change the Q factor again and perform the compression process on the compressed data that has been compressed once, because this will prolong the processing time.

Therefore, the Q factor is controlled by the method of determining the Q factor in the next one frame period in the immediately preceding one frame period. By the way, since the writing of the Q table to the compression / expansion unit must be completed within the immediately preceding one frame period, it takes time to fetch the image data to be compressed, perform compression processing, and rewrite the Q table. I can not afford to.

From the above, the compression / expansion devices 2d1 and 2d
It is decided to use two 2's and process them alternately for each frame period.

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

The second compression / expansion unit 2d2 rewrites the Q table within the nth frame period and compresses within the (n + 1) th frame period, as shown in FIG. After performing, Q within the (n + 2) th one frame period
The table is rewritten, and the Q table is rewritten and the compression process is alternately performed for each frame period. FIG. 6C shows a vertical synchronizing signal waveform.

In this way, the compression / expansion devices 2d1, 2d2
Performs complementary compression processing and Q table rewriting in the same one frame period. Similarly, the compression / expansion devices 2d1, 2d
As a matter of course, in d2, the expansion processing and the Q table rewriting are complementarily performed within the same one frame period.

Next, the Q factor is predicted so that the amount of compressed data does not vary depending on the image pattern, and the Q table is set to perform the adaptive control of the Q factor.

For this purpose, the medium 6 as a recording means is used.
The Q factor of the compression / expansion devices 2d1 and 2d2, which are data compression means, is changed according to the information amount of the digital video signal so that the recording data transfer rate in the (optical magnetic disk driver 6a, hard disk driver 6b, semiconductor memory 6c) is not exceeded. You can control it.

As shown in FIG. 8, the recording compression data characteristics a and b output from the compression / expansion devices 2d1 and 2d2 are obtained by comparing the Q factor of the compression / expansion devices 2d1 and 2d2 with the compression data file size V of the medium 6. The relationship is inversely proportional, and both characteristics a and b are non-linear. In the characteristic a of a relatively fine pattern and the characteristic b of a relatively coarse pattern, when the Q factor is relatively small, both characteristics a,
Although the respective compressed data file sizes V corresponding to b are largely different, each compressed data file size V becomes an approximation that converges within a certain range as the Q factor becomes relatively large.

Therefore, in order to make the non-linear recording compressed data characteristics a and b linear characteristics, as shown in FIG. 9, the reciprocal of the Q factor (K / Q, K is a positive number) is used as a parameter. Similarly, when plotted in the same manner, the non-linear recording compressed data characteristics a and b become linear characteristics a ′ and b ′. Then, in the figure, a virtual convergence point O at which the linear characteristics a'and b'will converge is assumed, and it is approximated that the characteristics of all patterns finally converge to the virtual convergence point O. ..

After that, the Q factor based on the virtual convergence point O is determined. First, as shown in FIG. 10, an arbitrary Q factor (for example, Q = 1) is applied to the compression / expansion units 2d1 and 2d2.
50) is given to perform data compression, and as a result, the point T =
Suppose that it becomes (x0, y0). After that, a straight line c passing through this point T and the virtual convergence point O is obtained. Then, a new Q factor corresponding to the compressed data file size V (designated M size) of the medium 6 at this time is obtained and set as the Q factor of the next frame period.

As described above, the data compression recording operation performed in real time by the moving image recorder is to repeat the following steps (1) to (4). (1) Any Q factor (eg Q = 15) as a test
Data compression is performed in 0), and the first Q factor is determined from the result. (2) The recording work is started, and the compressed data is transferred from the compression / expansion units 2d1 and 2d2 to the medium 6. (3) If the amount of compressed data transferred from the compression / expansion devices 2d1 and 2d2 is within a predetermined range (for example, within ± 1 kByte) compared with the designated compressed data amount of the medium 6, the Q table is not rewritten. , Return to the operation of (2) above. (4) If the amount of compressed data is outside the predetermined range (for example, ± 1 kByte or more) compared to the designated amount of compressed data, the Q table is rewritten and the operation returns to the above (2).

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 falling t1 of the vertical synchronizing signal (V signal) (shown in FIG. 7A) immediately after the REC is received. Then, the acquisition of the digital data for the first one frame is started (“FM acquisition” shown in FIG.

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 frames is started ("Recording" shown in FIG. Thereafter, the data taken into the frame memory 2c1 is read by the compression / expansion unit 2d1 in synchronization with the next falling t2 of the V signal (“FM read” shown in FIG. 7B), and receives it. Then, the compression / expansion device 2d1 sequentially starts data compression processing (“COMP” shown in FIG. 2B), and after the data compression is completed, it is immediately transferred to the CPU 5b via the bus interface 2e, the FIFO 2f, and the data bus line 7. (“V” in the figure (E)).

Data compression of digital audio data started in synchronization with the falling t1 of the V signal is V
It 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" in the figure (E)). The CPU 5b stores the compressed video data and compressed audio data thus transferred in its internal memory (eg, dual port RAM).

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

Now, the frame memory 2c2 starts taking in the digital data for the next one frame output from the A / D converter 2b in synchronization with the falling t2 of the V signal (see (C) in the figure). "FM import" shown). At the same time, the ADPCM encoder / 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 taken into the frame memory 2c2 is read out by the compression / expansion unit 2d2 in synchronization with the next falling t3 of the V signal (see "F" in FIG. 6C).
In response to this, the compression / expansion device 2d2 sequentially starts data compression processing (see "CO" in FIG.
MP "), the data is immediately transferred to the CPU 5b after the data compression is completed (" V "in the figure (E)).

Data compression of digital audio data started in synchronization with the falling t2 of the V signal is V
It 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 ((E) in the figure).
"A" in the figure). The CPU 5b stores the transferred compressed video data and compressed audio data in its internal memory.

Thus, the next 1 following the first 1 frame
The compressed video data and compressed audio data for the frames are stored in the internal memory of the CPU 5b ((E) in the figure).
("End writing of the next one frame").

As described above, after the recording operation is started, the recording operation described above 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 completion of the recording data transfer (R
ECSTOP is accepted), and various control signals for performing the following operations are output to the video processing unit 2 and the audio processing unit 3.

That is, the frame memory 2c1 synchronizes with the falling edge t9 of the V signal (shown in FIG. 9A) immediately after the REC STOP is accepted, and the frame memory 2c1 synchronizes with the falling edge of the V signal A / D. The final 1 that has been imported from the converter 2b ("FM import" shown in FIG.
The digital data for the frame is output to the compression / expansion unit 2d1 ("FM read" shown in FIG.

Thereafter, the frame memories 2c1 and 2c2
Will be inactive. Further, the ADPCM encoder / decoder 3c starts the compression in synchronization with the falling t8 of the V signal and ends the compression in synchronization with the falling t9 of the V signal (“recording” shown in FIG. 7D). The audio data is transferred to the CPU 5b in synchronization with the end of the transfer of the compressed video data from the compression / expansion unit 2d2 to the CPU 5b ("V" in the figure (E)) ("A" in the figure (E)). )). 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. After this, the compression / expansion devices 2d1 and 2d2 become inoperative. CPU
5b stores the transferred compressed video data and compressed audio data in the internal memory.

Thus, even if the recording operation is stopped on the way, the recording operation is continued until the final compressed video data and compressed audio data for one frame are stored in the internal memory of the CPU 5b (see (E) in the figure). ("Final frame writing is completed" in the figure)).

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

For example, the "FWD PLAY" switch 4
When the user presses the button 17, 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 falling t10 of the V signal immediately after the PLAY acceptance, the internal memory of the CPU 5b, the data bus 7, the FIFO.
2f and the compressed video data (“V” shown in FIG. 2E) reproduced via the bus interface 2e
It is supplied to d1 (“pressure derating” shown in FIG.

In response to this, the compression / expansion device 2d1 sequentially starts the expansion processing of the compressed video data in synchronization with the falling t11 of the V signal (see "DECOM" in FIG.
P "), and the decompressed digital video data is written in the frame memory 2c1 (" FM writing "shown in FIG. 7B).

Thereafter, the frame number corresponding to the digital video data written in the frame memory 2c1 is displayed in the "FRAME COUNTER" 4b for one frame period in synchronization with the falling t12 of the V signal (see the same figure ( "FM display" shown in B)). 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 the D / A converter 2g and the encoder 2h.

Compressed audio data (“A” shown in FIG. 7E) 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 encode / decoder 3c in synchronization with the falling edge t11 of the V signal, and the compressed audio data is decompressed here, and then the D / A converter 2g is synchronized with the falling edge t12 of the V signal. , Encoder 2h
A two-channel stereo audio signal is output via the "(playback (sound)" shown in FIG.

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

The compression / expansion device 2d2 sequentially starts the expansion processing of the compressed video data in synchronization with the falling t12 of the V signal ("DECOMP" shown in FIG. 7C), and the expanded digital video data. Frame memory 2c2
("FM writing" shown in FIG. 7C).

After that, 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 the D / A converter 2g and the encoder 2h.

The compressed audio data (“A” shown in FIG. 6E) supplied from the internal memory of the CPU 5b is AD-converted in synchronization with the falling t12 of the V signal.
After being supplied to the PCM encoder / decoder 3c, the compressed audio data data is decompressed there, and then in synchronization with the falling t13 of the V signal, 2-channel stereo audio is transmitted via the D / A converter 2g and the encoder 2h. A signal is output ("reproduction (sound)" shown in FIG.

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

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

Although the reproduction data transfer start by the push button operation of the “FWD PLAY” switch 417 has been described here, the present invention is not limited to this, and the “REV SCAN” switch 414, the “FWD SCAN” switch 415, and the “R” can be used.
"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
It is needless to say that the reproduction data can be transferred according to the designation of each switch even when the button is operated.

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

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 (S).
TOP reception), 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 received
In synchronization with the trailing edge t17 of the signal (shown in (A) of the figure), the expansion processing of the reproduced compressed video data ("pressure de" shown in (B) of the figure) already supplied to the compression / expansion unit 2d1. Are sequentially started (“DECOM shown in FIG.
P "), and the decompressed digital video data is written in the frame memory 2c1 (" FM writing "shown in FIG. 7B).

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

Thereafter, the frame memories 2c1 and 2c2
Will be inactive. At the same time, the frame memory 2c1
The digital data written in is output as a composite video signal or a Y / C signal via the D / A converter 2g and the encoder 2h. After this, the compression / expansion devices 2d1 and 2d2 become inoperative.

In addition, compressed audio data ((E) in the same figure)
Is supplied to the ADPCM encoder / decoder 3c in synchronization with the falling t17 of the V signal,
Here, after the compressed audio data has been decompressed,
The D / A converter 2 is synchronized with the falling t18 of the V signal.
2 channel stereo via g, encoder 2h
An audio signal is output ("reproduction (sound)" shown in FIG. After this, the ADPCM encode / decoder 3c becomes inoperative.

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

As described above, the composite video signal or the Y / C signal of the final frame or the 2-channel stereo audio signal can be completely reproduced even if the reproduction data is stopped during the transfer.

It is an input operation from the panel section 4 shown in FIG. 7 that controls the recording / reproducing operation of the moving picture recorder 1 described above.

As shown in the figure, when the "POWER" switch 401 provided on the front panel 4a is pressed, the power of the moving image 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 is for RE
Switch between MOTE / LOCAL. In the local state (LED in the switch is off), the moving image recorder 1
The input operation from the front panel 4a is effective. Further, in the remote state (the LED is lit), the communication module RS232C enables remote operation from outside the moving image recorder 1, and by inputting 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 external medium such as a magneto-optical disk driver, a hard disk driver, and a semiconductor memory.

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

When the "FORMAT" switch 404 is pushed once, the format start ready state is set, the LED in the switch is in a blinking state, and when the button is pushed again, the physical format and the logical format are executed. If any other switch is pressed in the format start ready state, the LED in the switch is changed from the blinking state to the extinguished state, and the format start ready state is released.

When the "DISPLAY" switch 405 is pressed, the LED in the switch is turned on,
Each number of the 9-digit “FRAME COUNTER” 4b and the 3-digit “CHAPTER” 4c can be displayed on a monitor (not shown) connected to the moving image recorder 1. The "FRAME COUNTER" 4b sequentially displays the frame number attached to the video image in minutes (M), seconds (S), and frames (F). Also, “CHAPTER” 4c is “CHAPTER“ 0 ”.
The chapter number designated by the "9" ten keys 422 is displayed.

[CH1 / CH2 INPUT level] The volumes 406a and 406b respectively adjust the recording levels of the L and R channels of the above-mentioned 2-channel stereo audio signal supplied to the moving picture recorder 1.

"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 respectively.

"HEAD PHONE OUT" terminal 4
Reference numeral 07 is used to connect a headphone here and monitor an audio signal during recording and reproduction. "HEA
DPHONE LEVEL ”volume 408, terminal 4
Adjust the output level of 07.

"RECORD MODE" switch 40
9a, 409b, and 409c are for selecting the image quality mode at the time of recording, and the "HIGH" switch 409a has the lowest compression rate of the above-mentioned compressed video signal and is "LOW".
The switch 409c has the highest compression ratio,
The "M" switch 409c is a standard compression ratio. The selected switches 409a to 409c turn on the internal LEDs.

The "ERASE" switch 410 is operated in advance with the "CHAPTER" 0 "to" 9 "" ten keys 42.
If either button 2 is designated as a push button and then this button is pushed, the erase ready state is entered and the LED in the switch 410 is in a blinking state. In this state, if the numeric keypad 422 other than the push button is previously designated, the push button is re-designated, the erase ready state is released, and the LED goes from the blinking state to the extinguished state. In the erase ready state,
When the "ASE" switch 410 is pushed again, the compressed data corresponding to the chapter number previously designated by the ten keys 422 can be erased (compressed data is divided and recorded for each chapter in the above-mentioned magneto-optical disk. Exist).

When the chapter number is clear ("CHA
Press the PTER "C" clear key 423 and
(When each number display of "CHAPTER" 4c is blank), pressing the "ERASE" switch 410 twice erases the entire surface of the magneto-optical disk.

[C-REC (CHAPTER-RE
The C) ”switch 411 is a switch for recording the compressed data in the chapter number erased by the above-mentioned“ ERASE ”switch 410. When recording the compressed data of a time longer than the compressed data time of the erased chapter number, the recording is automatically stopped before the next chapter. L in switch 411 for recording
The ED lights up, and the switch 411 is locked when recording is being performed on the specified chapter number.

The "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. The recording with this key switch is additionally recorded after the last chapter.

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

The "REV SCAN" switch 414 is
"REV PLAY" switch 416 or "REV PLAY"
"SLOW" switch 418, "REV STILL"
If the push button is pressed during operation of the "STEP" switch 420, the LED in the switch is turned on, and reverse reproduction is performed at a quadruple speed from that point. When this switch is pressed from the stop state, reverse playback is performed from the end of the designated chapter at 4 × speed.

The "FWD SCAN" switch 415 is
"FWD PLAY" switch 417 or "FWD PLAY"
"SLOW" switch 419, "FWD STILL"
If the push button is pressed during the operation of the "STEP" switch 421, the LED in the switch is turned on, and the reproduction is carried out at 4 times speed from that point. When this switch is pressed in the stop state, reproduction is performed at 4 times 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"
If the push button is pressed during operation of the "STEP" switch 420, the LED in the switch is lit, and reverse reproduction is performed at the standard speed from that point. When this switch is pressed from the stop state, reverse playback is performed from the end of the specified chapter at standard speed.

The "FWD PLAY" switch 417 is
"FWD SCAN" switch 415 or "FWD SCAN"
"SLOW" switch 419, "FWD STILL"
When the push 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 in the stop state, playback is performed at the standard speed from the start of the specified chapter.

The "REV SLOW" switch 418 is
"REV SCAN" switch 414 or "REV SCAN"
PLAY ”switch 416,“ 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 from that time point, slow reproduction in the reverse rotation direction is performed. When this switch is pressed from the stop state, slow playback in the reverse rotation 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 push button is pressed during the operation of the "STEP" switch 421, the LED inside the switch is turned on, and from that point in time, forward slow-motion reproduction is performed. When this switch is pressed from the stop state, forward slow playback is performed from the start of the specified chapter.

The “REV STILL STEP” switch 420 is the “REV SCAN” switch 414 or the “REV PLAY” switch 416, and the “REV STILL STEP” switch 416.
When the push button is pressed during the operation of the "SLOW" switch 418, the LED in the switch is lit up, and from that time point, the reverse frame feed (still) mode is set. Each time the switch is pressed, frame-by-frame reverse playback is performed one frame at a time. When this switch is pressed in the stop state, the reverse frame feed mode starts from the end of the specified chapter.

The "FWD STILL STEP" switch 421 is the "FWD SCAN" switch 415 or the "FWD PLAY" switch 417, "FWD".
When the push button is pressed during the operation of the "SLOW" switch 419, the LED in the switch is turned on, and from that time point, the frame forward (still) mode is set. 1 each time you press the switch
Plays back frame by frame in the forward direction. When this switch is pressed in the stop state, the forward frame advance mode starts from the start of the specified chapter. "C
HAPTER "0" to "9" Numeric keys 422 are used to specify a chapter number. "CHA
By pressing the PTER “C” clear key 423, the chapter key specified with the ten keys 422 can be
The number can be cleared. When this button is pressed, each number display of "CHAPTER" 4c becomes blank. "CHAPTER" SARCH "" key 42
Step 4 cues the specified chapter number. When the search is completed and the unit enters the standby state, the LE in the switch
D lights up.

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

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

[0113]

As described above, the information recording apparatus according to the present invention outputs the compressed data obtained by compressing the digital video signal according to the JPEG standard and the data compressing means. A recording unit for recording the recording compressed data, and the compression parameter of the data compression unit is variably controlled so as not to exceed the recording data transfer rate in the recording unit. The data transfer rate can be maintained at a constant value at all times, and the change in the video image to be data-compressed (for example, the video image for each frame such as a monochrome image on the entire surface or a fine pattern on the entire image) Change), the data compression means can always output the recorded compressed data at a constant transfer rate. Since the transfer rate of the compressed data does not exceed the specified transfer rate of the recording data in the recording device such as the disk device or the semiconductor memory, the video signal with a very fine pattern for a long time is always stable and high density without loss. There is an effect that can be recorded.

[Brief description of drawings]

FIG. 1 is a system block configuration diagram of a moving image recorder that is an embodiment of an information recording / reproducing apparatus according to the present invention.

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

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

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

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

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

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

FIG. 8 is a diagram illustrating a relationship between a Q factor of a compression / expansion device and a compressed data file size.

FIG. 9 is a diagram illustrating the relationship between the reciprocal of the Q factor and the compressed data file size.

FIG. 10 is a diagram illustrating a method of determining a Q factor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 moving image recorder 2 video processing unit 3 audio processing unit 4 panel unit 5 control unit 6 media (recording unit) 2d1, 2d2 compression / expansion unit (data compression unit) 3c ADPCM decoding / encoder 6a magneto-optical disk driver 6b hard disk driver 6c semiconductor memory

Claims (1)

[Claims] 1. A data compression means for outputting recording compression data obtained by compressing a digital video signal according to the JPEG standard, and a recording means for recording the recording compression data output from the data compression means, An information recording apparatus, wherein a compression parameter of the data compression means is variably controlled so as not to exceed a recording data transfer rate in the recording means.