JPH0447873A - Dubbing device - Google Patents

Abstract

PURPOSE:To attain excellent dubbing by providing a detection means detecting a synchronizing code from a control area of a signal reproduced from one recording medium and a control means controlling a period of recording for other recording medium based on the reception of the code to the device. CONSTITUTION:A format of a digital signal recorded or reproduced consists of bits [b15-b4], bits [b3-b1] and a bit [b0] for a picture area, a voice area and a control area set respectively. A video signal of the NTSC system is used and a picture data by 30 frames is arranged in the picture area for each compression reference period and the data is compressed within 1152000 bits. As the coding system for a voice data, the ADPCM system is employed and the data is compressed within 288000 bits. The control area is provided with a synchronization code section, a mode code section and a control code section and the time of recording on other recording medium is controlled by using the synchronization code detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an apparatus for dubbing a moving picture digital video signal and a digital audio signal recorded simultaneously.

[Prior art] Current digital audio recorder (hereinafter referred to as rD)
(referred to as "AT") is designed to record and reproduce only digital audio signals.

[Means for Solving the Problems] However, it would be very convenient if not only digital audio signals but also other signals, such as digital video signals for moving images, could be simultaneously recorded and reproduced.

Therefore, in the present invention, it is possible to dub a moving image digital video signal and a digital audio signal recorded at the same time in a good manner.

[Means for Solving the Problems] In the first invention, a digital signal of N bits (N is an integer) is recorded, and a portion of the N bits forms an image area, an audio area, and a control area, respectively. In the image area of each compression reference period, compressed digital video signals for multiple screens constituting a moving image are arranged, and in the audio area of each compression reference period, digital audio signals for the compression reference period are arranged. In a dubbing device that reproduces from one recording medium and records it on another recording medium, a plurality of types of synchronization codes are distributed at predetermined intervals in the control area in each compression reference period. The apparatus includes a detection means for detecting a synchronization code from a control area of a signal reproduced from the medium, and a control means for controlling a recording period on another recording medium based on the synchronization code detected by the detection means. be.

The second invention is recorded in the state of a digital signal of N bits (N is an integer), and a part of the N hits forms an image area, an audio area, and a control area, respectively, and the image area in each compression reference period is recorded. The compressed digital video signals for multiple screens constituting a moving image are arranged, and the digital audio signals for the compression reference period are arranged in the audio area for each compression reference period, and the control in each compression reference period is In a dubbing device that reproduces a time code from one recording medium and records it on another recording medium, the time code is detected from the control area of the signal reproduced from one recording medium. The recording medium includes a detection means and a control means for controlling a recording period on another recording medium based on the time code detected by the detection means.

[Function] In the first invention, the recording period on another recording medium is controlled by the synchronization code detected from the control area of the reproduced signal, and the dubbing start key and the dubbing end key control the recording period. When operating dubbing,
It is possible to control recording from slightly before a certain compression reference period to slightly after another compression reference period, making it possible to efficiently record necessary portions.

In the second invention, the period of recording on another recording medium is controlled by the time code detected from the control area of the signal to be reproduced, and dubbing of the period set with the dubbing period setting key is performed. This can be done automatically.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. In this example, a DAT is used as the recording/reproducing device.

FIG. 2 shows the format of the digital signal recorded and reproduced in this example. 16 humans) [b15~b
O], bits [b]5 to b4], bits [b3 to
bl] and bit [bO] are an image area, an audio area, and a control area, respectively.

Here, the conventional audio sampling clock is 48k
If the DAT transmission rate is 48kHzX2X16bit = 1536kbps, as in the case of recording left and right 2-channel digital audio signals at Hz, the transmission rate in the image area is 48kHzX2X12bit = 1152kbps, and the transmission rate in the audio area is , 48kHzX2X3bit = 288kbps, and the transmission rate in the control area is 48kHzX2X1bit = 96kbps (see Figure 3).

The recorded data is configured for a predetermined period, in this example, one second as a unit period (hereinafter referred to as "compression reference period").

That is, in each compression reference period, the image area is 115
The audio area is 288,000 bits, and the control area is 96,000 bits.

In this example, an NTSC video signal is used, and image data for 30 frames is arranged in the image area in each compression reference period. In this case, the image data for 30 frames has too much information as it is. For example, the pixel data of l frame is 256H x 240V,
And when the luminance signal Y, red difference signal U, and blue difference signal ■ are each 8 bits, the amount of information for 30 frames is 2.
56X240X8X30X3 = 44236800 bits.

Therefore, the image data for 30 frames is 115,200
It is compressed to within 0 bits.

For example, pixel data of 256H x 240V is halved by subsampling processing.

Furthermore, a total of 24 bits of the luminance signal Y, red difference signal U, and blue difference signal (2) are compressed into 9 bits.

As a result, the amount of information for one frame is 256X24
0X1/2X9 = 276480 bits.

Further, the image data of the second to 29th frames are each differentially compressed image data using the image data of the first frame as reference image data, and the information amount of this differentially compressed image data is, for example, 27,200 bits. .

Therefore, the amount of information for 30 frames is 276,480
Xl+27200X29=1065280 bits, which is within 1152000 bits.

Note that the remaining 86,720 bits are used for fixed length adjustment.

FIG. 4 shows an example of the structure of recorded data. At the beginning of the image area of each compression reference period are reference image data corresponding to the image data of the first frame, VBI, VB2, etc.
・ is arranged, followed by differentially compressed image data Δcl, Δc2, corresponding to the image data of the 2nd to 29th frames.
φ numbers Δc29 are sequentially arranged.

Furthermore, audio data for this compression reference period is arranged in the audio area for each compression reference period.

This audio data is data within 288,000 bits.

For example, the ADPCM method is adopted as the audio data encoding method, and the data is compressed.

As a result, when the sampling frequency is 32 kHz, 4 bits per sample, and 2 channels (stereo or 2 monaural channels), the amount of information is 32 kHz x 4 bits x 2.
The channel is 256,000 bits, and the data is within 288,000 bits.

Note that the remaining 32,000 bits are used for frequency adjustment.

As mentioned above, the 16 hits b15~ of the digital signal
A voice region is formed by 3 pitches b3 to bl of bO, and the transmission rate of the voice region is 96 kHz×3 pits=288 kbps (see FIGS. 2 and 3).

This can also be considered as 32kHz x 9 bits = 288kbpS. Therefore, for example, as shown in FIG. 5, audio data is allocated to 8 of each 9 bits, and the bit rate is adjusted. That is, 32k
Hz x 8 bits: 256 kbps.

Furthermore, the control area in each compression reference period is provided with a synchronization code section, a mode code section, and a control code section.

A plurality of synchronization code sections are provided in each compression reference period, and in this example, four synchronization code sections are provided at intervals of 0.25 seconds. For example, an area of 64×1 bits is secured in each synchronization code section. A framing code is used as a synchronization code,
Different types of synchronization codes 1 to 4 are arranged in the four synchronization code sections, respectively.

As shown in FIG. 4, synchronization code 1 is assigned to the synchronization code section immediately before the next compression reference period, and synchronization code 4 to 2 is assigned to the three previous synchronization code sections, respectively.
will be arranged.

A mode code section is provided following each synchronization code section. That is, in each compression reference period, 4
Each is provided. For example, each mode code section contains 64×1
The bit area is secured.

In this case, the end of the mode code section that follows the synchronization code section having synchronization code 1 is arranged so as to be located at the beginning of the next compression reference period.

The same data is allocated to the four mode code sections in each compression reference period. In this mode code section, data between image data, audio data, etc. to be arranged in the next compression reference period is arranged.

The following data can be considered as data related to image data.

■Resolution data 256H x 240V 512HX 480V 768H , Blue difference signal ■ Red signal R1
Green signal G, blue signal B Other bit data 24 bits (8 [Y, R] + 8 [LI, G] + 8 [V
, B co) 16 bits (6 [y] +5 [U] +5 [V co)
In addition to 9-bit (Y, U, V or R, G, B compressed data), the following data may be considered as data between the audio data.

■Encoding method data DPCM PCM (linear) PCM (nonlinear) Other ■Bit data 4 bits, 6 bits, 8 bits, 10 bits 12 bits, 16 bits, etc. ■Sampling frequency data 16kHz, 32kHzS 44.1kHz.

48 kHz, Other ■ Channel number data 1 channel, 2 channels, and other mode In addition to the data related to the image data and audio data mentioned above, the scene change occurs in the next compression reference period as described later. Sometimes, data indicating the presence or absence of a scene change is also arranged.

A control code section is provided following each mode code section. That is, four are provided for each compression period.

For example, an area of 23136 x 1 bit is secured in each control code section.

The same data is allocated to the four control code sections in each compression reference period. This control code section includes a microcode for decompressing the image data placed between the next compression standards U, and is made to be compatible with any compression method during playback.

In addition, the 41st! Although not shown in FIG.
A 6-bit guard area is provided.

As mentioned above, by distributing the same data to the four mode code sections and the control code section, during playback, the mode code and control code can be efficiently obtained no matter where the playback is started. The operation of the playback signal processing system can be smoothly controlled.

FIG. 6 shows the structure of recorded data when there is a scene change.

When there is a scene change, the recording state of the image data is reset at a point in the middle of the compression reference period (see time point tc in FIG. 6). That is, from time point tc, the reference image data VBN+2 after the scene change, differentially compressed image data ΔC1, Δc2, . . . are sequentially arranged and recorded in the image area.

In addition, along with this, the recording state of the data in the control area is also reset, and a synchronization code section having synchronization code 1 is provided immediately before the reference image data V B N+2. Data indicating that there is a scene change is placed in the mode code section of the compression reference period before the scene change.

1 shows an example of a signal processing device used when recording and reproducing recorded data as shown in FIGS. 4 and 6 using DAT.

First, the recording system will be explained.

The NTSC color video signal Sv supplied to the video in terminal 11 is amplified by an amplifier 12 and then supplied to a decoder 13. The decoder 13 outputs a luminance signal Y, a red difference signal U, and a blue difference signal ■, which are respectively supplied to the A/D conversion@14.

Further, the video signal S■ outputted from the amplifier 12 is supplied to a synchronization separation and clock generation circuit 15. circuit 1
From 5, frequency 8 synchronized with the synchronization signal of video signal S■
fsc/3 (fsc is color subcarrier frequency 3.58MH
2) clock CKRI is output, and this clock CK
RI is supplied to the A/D converter 14 as a sampling clock.

In the A/D converter 14, each of the signals Y%U and V is sampled so that the number of samples in one effective horizontal period is 256, and converted into a digital signal with 1 sample of 8 bits.

The signal YSU, (2) output from the A/D converter 14 is supplied to the movable terminal of the changeover switch 16.

Although the control line is not shown, the changeover switch 16 is controlled by a controller 110 including a CPU.
For each frame period, c side, b side, c side, c side, etc.
・Sequentially connected to.

The fixed terminals on the a-c side of the changeover switch 16 are connected to the RAM 17.
It is connected to the input side of a to 17c. RAM 17
Writing and reading of a to 17c is controlled by the RAM controller 120. Note that the operation of the RAM controller 120 is controlled by the controller 110.

The RAM controller 120 is supplied with the clock CKRI output from the circuit 15, and is also supplied with the vertical synchronization signal VDR1 and the horizontal synchronization signal T (DR) as a reference synchronization signal. The clock CKR2 with a frequency of 8fsc is supplied as a master clock, and the vertical synchronization signal V
DR1 horizontal synchronization signal HDR is supplied as a reference synchronization signal.

Furthermore, the controller 110 has a bit clock BCK (shown in FIG. 7B) and a clock LRCK (shown in FIG.
) is provided as a reference clock for timing with the DAT 130.

Note that the operation of the DAT 130 is controlled by the controller 110.

RAM17a to 17c each have a selector switch a.
“During one frame period connected to the −c side, the signal Y,
Between each of U and ■, 256 pieces in the horizontal direction,
240 sample data are written in the vertical direction.

Signals Y written in these RAMs 17a to 17c,
The 256H x 240V data for each of U and ■ is read out twice in the next two frames.

The signal read out from the RAM 17a is transferred to the selector switch 1.
8 a, 18 b, and 18 c, respectively, are supplied to the a side, a side, and C@ fixed terminals. The signals read out from the RAM 17b are transferred to the changeover switches 18a, 18b,
It is supplied to the b@, b side, and a@ fixed terminals of 18c, respectively. The signals read from the RAM 17c are the ell, ell, and
cll, supplied to the fixed terminal on the b side.

Although the control lines are not shown, there are changeover switches 18a to 18c.
are switched and controlled by the controller 110. These changeover switches 18a to 18c are connected to the C side, the a side, the b side, when the changeover switch 16 is connected to the a side, the b side, the C side, the a side, etc. C side...
・Sequentially connected to.

The output signals of the changeover switches 18a to 18c are each supplied to an image compression section 19. The operation of this image compression section 19 is controlled by a controller 10.

The image compression unit 19 performs the following processing on the first frame of image data among the 30 frames of image data constituting each compression reference period (1 second). First, subsampling processing is performed, and the signals Y, U,
The number of samples in one frame for each of V is 1
/2. Next, the 24-bit data is compressed to 9 bits. Thereby, reference image data VBN is formed.

Moreover, for the image data of the 2nd to 30th frames,
The following processing is performed respectively. First, subsampling processing is performed to obtain signals Y and U.

The number of samples in one frame between each of ■ is 1/2
It is said that The 24-hit data is then compressed to 9 bits. Furthermore, a difference from the reference image data is taken.

As a result, differentially compressed image data ΔC1 to Δc29 are formed.

Reference image data VBN and differentially compressed image data Δc1 to Δc2 formed by the image compression unit 19 in each compression reference period
9 are supplied to the video RAMs 22a to 22c via the connection switch 20 and the changeover switch 21, and are sequentially written to predetermined addresses.

Although the control lines are not shown, the connection switch 20 and the changeover switch 21 are controlled by the controller 110. The connection switch 20 is turned on during recording. The changeover switch 21 is set to the a side, bm,
Connected sequentially to C side, all, and sea.

Writing and reading of the video RAMs 22 a to 22 c is controlled by the RAM controller 120 .

The video RAMs 22a to 22c each contain reference image data V formed by the image compression unit 19 during one compression reference period when the changeover switch 21 is connected to the a-C side.
BN and differential compressed image data Δc1 to Δc29 are written.

Reference image data VBN and differentially compressed image data Δc1 to Δ written in these video RAMs 22a to 22c
c29 is read out during the following one compression reference period.

Reference image data VBN and differential compressed image data Δc1~ read out from video RAM 22a~22c
Δc29 is supplied to the mixing circuit 24 via the changeover switch 23, and is placed in the image area of the recording data.

Although the control line is not shown, the changeover switch 23 is controlled by a controller 110. Changeover switch 23
are connected to the a side to the C side, respectively, during the period when image data is read from the video RAMs 22a to 22b. The operation of mixing circuit 24 is controlled by controller 110.

The left and right channel audio signals SAL and SAR supplied to the audio in terminal 31 are amplified by an amplifier 32 and then supplied to an audio digital signal processor (audio DSP) 33.

The operation of the audio DSP 33 is controlled by the controller 110. In this audio DSP 33, the left and right channel audio signals SAL and SAR are each sampled with a 32 kHz clock, and are further encoded using the ADPCM method using the RAM 34 so that one sample has 4 bits. As a result, 256,000 bits of audio data are formed corresponding to each compression reference period.

The audio data formed by the audio DSP 33 is supplied to the mixing circuit 24 and is added to the audio area of the recorded data.
Arranged as shown in the figure.

In this case, the audio data output from the audio DSP is controlled so as to correspond to the image data supplied to the mixing circuit 24.

Further, 25 is a circuit for generating control data such as a synchronization code, a mode code, and a control code. The operation of this generating circuit 25 is controlled by a controller 110. The control data output from the generation circuit 25 is supplied to the mixing circuit 24 and arranged in the control area of recording data.

In this way, recording data as shown in FIG. 4 is formed in the mixing circuit 24, and this recording data is transferred to DAT 1.
30 and recorded in the DA'l' format.

Further, 26 is a scene change detection circuit.

The detection circuit 26 is supplied with two consecutive frames of signals supplied to the image compression section 19 from the changeover switches 18a to 18C. Then, data at a plurality of sample points are compared based on the comparison position signal from the RAM controller 120, and it is determined whether the difference exceeds a specified value. When the number exceeds the specified value,
It is determined that it is a scene change, and the determination signal is supplied to the controller 110 and the RAM controller 120.

When a scene change occurs, the signal processing state is reset even during the 1 second compression reference period. In other words,
The image compression unit 19 starts forming the reference image data VBN using the image after the scene change, and the changeover switch 21 is also switched to the next video RAM.

Note that the signal processing state of the audio system is also reset in the same way as the video system. The operation of the control data generation circuit 25 is also controlled, the generation timing of the synchronization code is controlled, and data indicating that a scene change has occurred is allocated to the mode code of the compression reference period before the scene change.

In this way, when there is a scene change, the mixing circuit 2
4, record data as shown in FIG. 6 is formed, and this record data is supplied to the DAT 130 and
It is recorded in this format.

FIG. 8 shows a timing chart of a recording system between a video signal and an audio signal.

A and B in the figure represent a video signal S and audio signals SAL and SAR, respectively, which are supplied to terminals 11 and 31. VGI, VG2,---AGI, AC3,
... are the video signal and audio signal of each compression reference period, respectively.

As shown in FIG. 2C, compressed image data CV Gl, CVG2, .compressed by the image compression section 19 are sequentially written into the video RAMs 22a to 22c.

In addition, although not mentioned above, the RAM 34 also contains the above-mentioned video R.
Similar to AM 22 a to 22 c, RAM a
As shown in the figure, the compressed audio data CA converted into ADPCM by the audio DSP 33 is provided.
GI, CA G2, . . . are written sequentially.

In this way, the video signal and the audio signal are processed at the same timing, and even if there is a scene change, the DAT 130 can store the compressed image data CV of each compression reference period.
GI, CVG2, ... and compressed audio data CAGI, C
AG2, . . . are recorded in correspondence (see E in the same figure).

Next, the reproduction system will be explained.

Data as shown in FIGS. 4 and 6 reproduced from the DAT 130 is supplied to a separation circuit 4. The operation of the separation circuit 41 is controlled by the controller 110,
Image data, audio data, and control data are separated from the reproduced data.

The control data separated by the separation circuit 41 is supplied to a control data discrimination circuit 42, where a synchronization code, mode code, and control code are discriminated, and the discrimination results are supplied to the controller 110.

Under the control of this controller 110, a reproduction signal processing system such as an image decompression unit and audio DSP 33, which will be described later, performs processing corresponding to the format and compression method of the reproduced image data and audio data. be done.

This makes it possible to deal with any situation regarding the image data and audio data to be reproduced. In the following, a case will be described in which data as shown in FIG. 4 or 6 is reproduced.

Further, 43 is a synchronization signal and clock generation circuit. The operation of this generating circuit 43 is controlled by a controller 110. Then, from the generation circuit 43, the frequency 4
f sc/3 clock CKPI, vertical synchronization signal V
DP, a horizontal synchronizing signal HDP, and a clock CK P2 with a frequency of 8 fsc are output.

The RAM controller 120 is supplied with the clock CKPI output from the generation circuit 43, and also supplied with the vertical synchronization signal VDP and the horizontal synchronization signal HDP as reference synchronization signals. The controller 110 also has a clock CKP2 with a frequency of 8fsc output from the generation circuit 43.
is supplied as a master clock, and a vertical synchronization signal VDP and horizontal synchronization signal HDP are supplied as reference synchronization signals.

Further, reference image data VBN and differential compressed image data Δcl~ of each compression reference visit are separated by the separation circuit 41.
Δc29 is the connection switch 44 and the changeover switch 45
The data is supplied to the video RAMs 22a to 22C via the video RAMs 22a to 22C, and sequentially written to predetermined addresses.

Although the control lines are not shown, the connection switch 44 and changeover switch 45 are switched by the controller 110. The connection switch 44 is turned on during playback. The changeover switch 45 selects all, b for each compression reference period.
side, a side, a side, . . . are connected sequentially.

Writing and reading of the video RAMs 22 a to 22 c is controlled by the RAM controller 120 . R
The reference image data VBN and differential compressed image data Δcl to ΔC29 separated by the separation circuit 41 are written into the AMs 22a to 22c in one compression reference period whose respective changeover switches 45 are connected to a=cgg.

The reference image data VBN and differentially compressed image data ΔC! written in these video RAMs 22a to 22c! ~Δ
c29 is read on subsequent l compression reference visits.

Reference image data VBN and differentially compressed image data ΔC] to Δc2 read from video RAMs 22a to 22c
9 is supplied to the image expansion section 46 via the changeover switch 23. Although the control line is not shown, the changeover switch 23 is controlled by the controller 110. The changeover switch 23 is connected to the a side to the C side, respectively, during a period when image data is read from the video RAMs 22a to 22c.

The operation of the image decompression section 46 is controlled by the controller 130 based on the control code as described above, and performs the opposite process to that of the image compression section 19.

In the image decompression unit 46, the following processing is performed on the reference image data VBN. First, 9 bits of data are expanded to 8 bits each for signals Y, U, and V. Next, interpolation processing is performed, and the signals Y, U,
The number of samples in one frame between each V is doubled. This forms the first frame of image data.

Further, the following processing is performed on each of the differentially compressed image data Δc1 to Δc29. First, the difference data is converted back to 9-bit data using the reference image data. Next, the 9-bit data is sent to the signals Y, U, V
are expanded to 8 bits each.

Furthermore, interpolation processing is performed, and the signals )', u,
The number of samples in one frame between each of v is doubled. As a result, image data of the second frame to the 30th frame is formed.

Signals Y, U, V output from the image decompression unit 46
are supplied to a matrix circuit 47, and primary color signals R, G, and B output from this matrix circuit 47 are supplied to a D/A converter 48. The D/A converter 48 is supplied with a clock CKPI from the generation circuit 43. And D
Analog primary color signal R output from /A conversion'@48
, G, B are video out terminals 49R,
49G and 49B.

The terminal 50 is a synchronization signal output terminal, and this terminal 50 receives the decoded synchronization signal 5YNC output from the generation circuit 43.
is derived.

Furthermore, the audio data separated by the separation circuit 41 is supplied to the audio DSP 33, where the ADPCM signal is demodulated. The left and right audio signals SAL and SAR output from the audio DSP 33 are output from the amplifier 3.
5 to the audio out terminal 36.

Note that when a scene change occurs, the signal processing state is reset even during the 1 second compression reference period. In other words, the changeover switch 45 is switched and writing to the next video RAM is started. Even during the processing performed by the image decompression unit 46 after one compression reference period, the formation of the first frame of image data is started from the reference image data VBN after the scene change.

Note that the signal processing state of the audio system is also reset in the same way as the video system.

FIG. 9 shows a timing chart of a reproduction system between a video signal and an audio signal.

From DAT 130, compressed image data CVGL, CVG2, etc. of each compression reference period and compressed audio data CA
GI, CAG2, and are played in correspondence (9th
(See Figure A).

The video RAMs 22a to 22c contain reproduced compressed image data CVGI, CV G2, and
The inside of φ is written sequentially.

In addition, in the RAM a - c area of the RAM 34, as shown in FIG.
1% CAG2, . . . are written sequentially.

In this way, compressed image data and compressed audio data are processed at the same timing, and terminals 49R to 49B and 36
are the video signals VGI and V of each compression reference period, respectively.
G2, . . . and audio signals AGI, AG2, .

FIG. 10 is a flowchart showing the operation of the video system during normal playback.

In the figure, when the playback key of the keyboard 140 is turned on, it is determined in step 51 whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
In step 52, the mode code and control code placed following the synchronization code are loaded into the control area, and the image expansion section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

Next, in step 53, it is determined whether synchronization code 1 has been input. When synchronization code 1 is input, in step 54, one of the video RAMs (Video RAM
(M22a to M22c are used sequentially), input of compressed image data for one compression reference period is started.

Next, in step 55, it is determined whether synchronization code 1 has been input. When synchronization code 1 is input, input of compressed image data for one compression reference period to the next video RAM is started in step 56.

Next, in step 57, the video RA
The compressed image data written in M is sequentially read out and the image decompression section 46 starts decompression processing.

The image is then displayed on a monitor (not shown) connected to the terminals 49R to 49B.

Next, in step 58, it is determined whether synchronization code 1 has been input. When the synchronization code] is input, it is determined in step 59 whether or not the stop key on the keyboard 140 is on.

When the stop key is not on, the process returns to step 56 and repeats the above-described operation, while when the stop key is on, the playback operation is stopped.

Note that the decompression processing in step 57 starts after the decompression processing of the compressed image data written to any of the video RAMs 22a to 22c in the previous compression reference period is completed, and then the processing for the subsequent compression reference period is started. .

Therefore, when there is a scene change in the middle, the compressed image data of a certain compression reference period is read from one video RAM and decompressed, while the compressed image data is written to the other two video RAMs. (See the scene change section in FIG. 9 C0D). In other words, the compressed image data (CV G N+1) before the scene change is written to one of the two video RAMs,
On the other hand, compressed image data (CV G
N+2) is written. In this sense, three video RAMs 22a--22c are used.

Although not mentioned above, as an IC that performs compression processing in the image compression section 19 and decompression processing in the image decompression section 46, there is, for example, Intel Corporation's compression/decompression IC [82750PBI.

Next, special playback such as still playback and strobe playback will be explained.

First, still playback will be explained. The playback tape running speed in still playback is the same as in normal playback.

FIG. 11 is a flowchart showing the operation of still playback (first still playback) in which still images based on reference image data are sequentially displayed by manual operation.

In the figure, when the first still playback is designated by operating the keyboard 140, it is determined in step 61 whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
In step 62, the mote code and control code placed following the synchronization code are loaded into the control area, and the image expansion section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

Next, in step 63, it is determined whether the synchronization code 1 has been input. When synchronization code 1 is input, step 64 is performed to input one of the video RAMs (Video RAM).
M22a to 22c write reference image data to (next use).

Next, in step 65, reference image data is read from the video RAM, and the image decompression section 46 performs decompression processing to form image data for one frame, and this image data for one frame is stored in the memory. Store in.

Then, image data for one frame is repeatedly read out from this memory, and a still image based on the reference image data is displayed on a monitor connected to terminals 49R-49B.

Next, in step 66, the DAT 130 is placed in a playback pause.

Next, in step 67, it is determined whether the playback key of the keyboard 140 is on. If the playback key is on, the playback pause state of the DAT 130 is released in step 68, and the process returns to step 61. Then, by the same operation as described above, a still image based on the reference image data of the next compression reference period is displayed.

Step 67, when the playback key is not on! i. In step 69, it is determined whether the stop key of the keyboard 140 is on. When the stop key is not on,
Return to step 67.

In step 69, when the stop key is on, the first
Stops the still playback operation.

FIG. 12 is a flowchart showing the operation of still playback (second still playback) in which still images based on reference image data immediately after a scene change are sequentially displayed by manual operation.

In the figure, when the second still playback is designated by operating the keyboard F' 140, it is determined in step 71 whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
In step 72, the mote code placed following the synchronization code is imported into the control area, and in step 73, based on the data indicating the presence or absence of a scene change in the mote code,
It will be judged whether there is a scene change or not. If there is no scene change, the process returns to step 71.

When there is a scene change, the control code placed following the mode code is loaded in step 74.

Then, based on the mode code and the control code, the image expansion section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

Next, in step 75, it is determined whether synchronization code 1 has been input. When synchronization code 1 is input, in step 76, one of the video RAMs (Video RAM
22a to 22c are used sequentially) to write the reference image data immediately after the scene change.

Next, in step 77, reference image data is read from the video RAM, and the image decompression section 46 performs decompression processing to form image data for one frame, and this image data for one frame is stored in the memory. Store.

Then, image data for one frame is repeatedly read out from this memory, and a still image based on the reference image data immediately after the scene change is displayed on the monitors connected to the terminals 49R to 49B.

Next, in step 78, the DAT 30 is brought into the state of recycled water.

Next, in step 79, it is determined whether the playback key on keyboard 140 is on. If the playback key is on, the playback pause state of the DAT 130 is released in step 80, and the process returns to step 71. Then, by the same operation as described above, a still image based on the reference image data immediately after the next scene change is displayed.

If the playback key is not on in step 79, it is determined in step 81 whether or not the stop key on the keyboard 140 is on. If the stop key is not on, the process returns to step 79.

Step 81, when the stop key is on, the second
Stops the still playback operation.

Figure 13 shows still playback (3rd stage) in which still images based on reference image data are automatically displayed sequentially at predetermined time intervals.
12 is a flowchart showing the operation of still playback. Steps corresponding to those in FIG. 11 are indicated with the same reference numerals.

In the figure, after the DAT 30 is placed in a playback pause state in step 66, it is determined in step 91 whether or not time t has elapsed.

When time t has elapsed, it is determined in step 92 whether the stop key of keyboard 140 is on. If the stop key is not on, then in step 68 the DAT
The playback pause state of 130 is released and the process returns to step 61.

In step 92, when the stop key is on, the third
Stops the still playback operation.

The rest is the same as the example in FIG. 11.

In this third still playback, still images based on reference image data of each compression reference period are automatically displayed on the monitor one after another at time intervals determined by time t.

Figure 14 shows still playback (fourth stage) in which still images based on standard image data immediately after a scene change are automatically displayed one after another.
12 is a flowchart showing the operation of still playback. Steps corresponding to those in FIG. 12 are indicated with the same reference numerals.

In the figure, after the DAT 130 is placed in a playback pause state at step 78, it is determined at step 94 whether time t has elapsed.

When the time t has elapsed, in step 95, it is determined whether the stop key of the keyboard 140 is on.

If the stop key is not on, step 80
The playback pause state at T130 is released and the process returns to step 71.

In step 95, when the stop key is on, the fourth
Stops the still playback operation.

The rest is the same as the example in FIG. 12.

In this fourth still playback, the next scene change is detected after time t has elapsed, and still images based on the reference image data immediately after the scene change are automatically displayed on the monitor one after another.

Note that when the pause key of the keyboard 140 is turned on to enter the playback pause state during the normal playback operation shown in the flowchart of FIG. It is also possible to display a still image of an arbitrary frame on a monitor so that a still image of an arbitrary frame can be monitored.

Next, strobe playback will be explained. The playback tape running speed in strobe playback is the same as in normal playback.

FIG. 15 is a flowchart showing the operation of strobe playback.

In the figure, when strobe playback is designated by operating the keyboard 140, it is determined in step 151 whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
At step 152, the mote code and control code placed following the synchronization code are taken into the control area, and the image decompression section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

Next, in step 153, it is determined whether synchronization code 1 has been input. When sync code 1 is input,
In step 154, one of the video RAMs (Video R
A M 22 a to 22 c are sequentially used), the input of compressed image data for one compression reference period is started.

Next, in step 155, it is determined whether the synchronization code l was manually input. When sync code 1 is input,
In step 156, N=0 is set, and in step 15
In step 7, L=1 is set, and in step 158, input of compressed image data for one compression reference period to the next video RAM is started.

Next, in step 159, the video R is
The reference image data written in AM is read out and expanded by the image expansion section 46. And terminal 49R~4
A still image based on the reference image data is displayed on a monitor (not shown) connected to 9B.

Next, in step 160, N=N+1 is set, and the differentially compressed image data ΔcN is read out from the video RAM and decompressed.

Next, in step 161, it is determined whether N is equal to LXM+1. Here, M is the number of frame skips in strobe display, and is set in advance using the keyboard 140.

If step 161 is not equal, step 16
Returns to 0 and performs the same processing as described above. On the other hand, when they are equal, in step 162, a still image based on the differentially compressed image data ΔcN is displayed on the monitor.

Next, in step 163, it is determined whether synchronization code 1 was entered manually. When synchronization code 1 is not input, L=L+1 is set at step 164, and step 1
Returning to step 60, the same operation as described above is performed.

When synchronization code 1 is input in step 163, it is determined in step 165 whether or not the stop key of keyboard 140 is on.

When the stop key is not on, the process returns to step 156 and the same operation as described above is repeated, while when the stop key is on, the strobe playback operation is stopped.

In such a strobe playback operation, in each compression reference period, still images based on image data of every M frame are sequentially displayed on the monitor, so-called strobe display.

Next, fast-forward playback will be explained.

FIG. 16A shows reproduced image data during normal reproduction, and VBI, VB2, . . . are reference image data of each compression reference period, and are reproduced at 1 second intervals during normal reproduction.

In this example, when certain reference image data, for example VBI, is played back, the playback tape running speed of the DAT 130 is increased to twice the normal speed and run for 2 seconds, and then the playback tape running speed is returned to the normal speed. The next reference image data is reproduced (as shown in FIG. 2B).

Thereafter, similar operations are repeated.

The reason why the reproduction tape running speed is returned to normal before reproducing the reference image data is to allow the rotating head to correctly scan the recording trunk without overlapping the recording trunk.

By the above-described playback operation, as shown in FIG.
H2, V B 11, ”l) 1 regeneration Sarel.

Note that in the portion shown by the broken line, the rotary head scans across the recording track, and correct image data cannot be obtained.

The reference image data VBI, VH2, reproduced in this way,
VBII, -- is shown in the same figure D C, m.
The data is sequentially written to the video RAMs 22a to 22c.

Then, the reference image data written in the video RAMs 22a to 22c is read out, supplied to the image expansion section 46, and expanded, thereby forming image data for one frame. Then, the still image based on the image data for one frame continues to be displayed until the image data for one frame is formed using the next reproduced reference image data (E in the same figure).
(illustrated).

In this way, during normal playback, 3.
Displayed at intervals of 15 seconds. Therefore, 5/3
．． Fast-forward playback is performed at approximately 1.6 times the 15″F.

FIG. 17 is a flowchart showing the operation of this fast-forward playback.

In the figure, when fast-forward playback is specified by operating the keyboard 140, the controller 110 moves to step 171.
The DAT 130 is controlled to be in a normal speed playback state.

Next, in step 172, it is determined whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
In step 173, the mote code and control code placed following the synchronization code are loaded into the control area, and the image expansion section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

Next, in step 174, it is determined whether the synchronization code 1151 has been entered manually. When synchronization code 1 is input, reference image data is written in one of the video RAMs (the video RAMs 22a to 22c are used for each page) in step 175.

Next, in step 176, the reference image data is read from the video RAM, and the image decompression unit 46 performs decompression processing to form image data for one frame, and stores the image data for one frame in the memory. Store. Then, image data for one frame is repeatedly read out from this memory, and a still image based on the reference image data is displayed on a monitor connected to terminals 49R-49B.

Next, in step 177, the controller 110 controls the DAT 130 to double the tape running speed.

Next, in step 178, it is determined whether two seconds have elapsed. When two seconds have elapsed, it is determined in step 179 whether the stop key on keyboard 140 is on.

When the stop key is not on, the process returns to step 171 and the same operation as described above is performed, and when the stop key is on, fast-forward playback is stopped.

In the above description, an example was shown in which fast-forward playback at a speed of about 1.6 times is performed, but fast-forward playback at any speed is possible by adjusting the playback tape running speed and running time.

Next, slow playback will be explained.

FIG. 18A shows the reproduced image data during normal reproduction, and shows the compressed image data of each compression reference period (reference image data VBN
and differential compressed image data Δc1 to ΔC29), which are sequentially reproduced every second during normal reproduction.

In this example, the DAT 130 is put into the normal speed playback state for three compression reference periods, then put into the slow playback state for the same period, and this is repeated thereafter.

By the operation of the AT 130 as described above, as shown in FIG.
I to CVG3) are played back consecutively, and then after the same period, the compressed image data (CVG4
~CVG6) are played continuously. Hereinafter, the same process will be repeated.

The compressed image data CVGI, CV G2, . . . of each compression reference period reproduced in this way is sequentially written into the video RAMs 22a to 22c, as shown in FIG.

The compressed image data written in the video RAMs 22a to 22c is then read out and supplied to the image decompression section 46 for decompression processing. In this case, similarly to normal playback, 30 frames worth of image data VGI, VO2, . . . are obtained from the compressed image data CVGI, CVG2, .
is formed.

Then, a moving image based on the image data VGI, VO2, . . . is displayed on the monitor, but the same screen is displayed continuously two frames at a time. In other words, image data VGI,
The time axis of the moving images from VO2, . . . is expanded twice and displayed (as shown in the figure).

In this way, the time axis of the moving image displayed on the monitor is expanded by twice, so that a 1/2 slow-motion image is displayed on the monitor.

FIG. 19 is a flowchart showing the operation of this slow playback.

In the figure, when slow playback is specified by operating the keyboard 140, in step 181, the controller 110
The DAT 130 is controlled to be in a normal speed playback state.

Next, in step 182, it is determined whether synchronization code 2, 3, or 4 has been input.

When any of these sync codes are entered,
At step 183, the mode code and control code placed following the synchronization code are loaded into the control area, and the image expansion section 46 and the like are set to operate in accordance with the compressed image data to be reproduced.

If there is no synchronization, N=0 is set in step 184, and then in step 185 it is determined whether synchronization code 1 has been input manually.

When synchronization code 1 is input, N=N+1 is set in step 186, and then N=N+ is set in step 187.
2 or not is determined. If N=2, go directly to step 188; if N=2, go to step 1
89, the process proceeds to step 188.

In step 189, reading of the compressed image data corresponding to three compression standards that are successively written into the video RAMs 22a to 22C is started, and the image decompression section 46 starts decompression processing, and the monitor ( (not shown)
Display video images.

In this case, the same screen is displayed continuously two frames at a time.

In step 188, one of the video RAMs (video R, A M 22a to 22c are used sequentially) is
Start inputting compressed image data for the compression base and period.

Next, in step 190, it is determined whether synchronization code 1 was entered manually. When sync code 1 is input,
At step 191, it is determined whether N=3. N
If not equal to 3, the process returns to step 186 and the same operations as described above are repeated.

When N=3, in step 192, the DAT 130 is controlled by the controller 110 to be in the regeneration hose state. At this point, video R, A M 22
Compressed image data for three consecutive compression reference frames are written in a to 22c.

Next, in step 193, it is determined whether the same time closing time T3 as the three compression reference intervals described above has elapsed.

Here, the reason why it is not set to 3 seconds is because the 3 compression reference periods may become shorter than 3 seconds when there is a scene change as described above.

Next, in step 194, the DAT 130 is controlled by the controller 110 to release the playback pause state, and in step 195, N=0 is set, and then the DAT 130 is controlled by the controller 110.
At step 96, it is determined whether the stop key of keyboard 1' 140 is on.

When the stop key is not on, the process returns to step 186 and repeats the above-described operation, while when the stop key is on, the slow playback operation is stopped.

The above description is based on an example in which the normal speed playback state during the three compression reference periods and the playback pause state during the same period are repeated, but the three compression reference periods are based on three video RAMs. 22a to 22C, and is not limited thereto. For example, it may be one compression reference period or two compression reference periods.

Furthermore, although the above example shows an example in which 1/2 slow playback is performed, slow playback at any speed is possible by adjusting the pause period. For example, if the pause period is set to wJm, which is twice the compression reference period played at normal speed, and the same screen is displayed for three frames,
The time axis of the moving image displayed on the monitor is expanded three times, resulting in slow playback of 1/3.

Next, reverse playback will be explained.

In order to realize reverse playback, the recorded data is structured as shown in FIG. The data structure of the control area is changed with respect to the example in FIG. 4.

That is, 4ijA synchronization code IA in each compression reference period.
~4A and mode code IA~4A are arranged. These are similar to the synchronization code and mode code in the example of FIG.

In the case shown in FIG.
Synchronization code IB-4 is placed in a symmetrical position with mode code IA-4A (control code area in the example in Fig. 4).
B. Mode codes IB to 4B are arranged.

The synchronization codes IA-4A and mode codes IA-4A can be detected during normal playback, while the synchronization codes IB-4B and mode codes IB-4B can be detected during reverse playback.

Similar to the mode code in the example shown in FIG. 4, data corresponding to the next compression reference period in the normal playback direction is arranged in the mode code IA-4A.

Mode codes IB to 4B contain data corresponding to the next four periods of compression base in the reverse playback direction.

In addition to data similar to mode codes IA to 4A, this includes differential compressed image data Δc in the next compression period.
Variation data of the data amount from 1 to Δc29, data as to whether or not the period is immediately before the occurrence of a scene change, data on the period in that case, etc. are arranged.

In the above description, the amount of data of the differentially compressed image data ΔC1 to ΔC29 is fixed, and therefore the arrangement position of each differentially compressed image data is fixed. However, as will be described later, depending on the state of the image, the differentially compressed image data Δcl~
The data amount of Δc29 may be varied to improve the performance of image data. In this case, the arrangement position of each differentially compressed image data changes. Therefore, as will be described later, in order to control the addresses of the video RAMs 22a to 22c during reverse playback and write playback data from the reverse direction to exactly the same address as during normal playback, each differentially compressed image data ΔC
It is necessary to consider the data amount of 1 to Δc29.

This is the differential compressed image data Δc1~
This is the reason why the fluctuation data of the data amount of Δc29 is arranged.

This variation in data amount will be described later.

By configuring the recorded data as shown in FIG. 20, during normal playback, the synchronization codes IA to 4A and the remote code are
A reproducing operation is performed using F'IA to 4A.

Furthermore, during reverse playback, the playback operation is performed using the synchronization codes IB to 4B and the remote codes IB to 4B. In this case, based on the fluctuation data of the data amount of the differentially compressed image data placed in the ``MOTECO'' IB-4B,
The addresses of the video RAMs 22a to 22c are controlled, and playback data is written from the opposite direction to exactly the same address as during normal playback.

As a result, the subsequent decompression processing in the image decompression section 46 is performed in the same manner as during normal playback, and a reverse playback screen is displayed on the monitor.

It should be noted that with the structure of the recorded data as shown in FIG. 20, still playback in the reverse direction, fast forward playback, and slow playback can be performed in the same way.

Next, fluctuations in the amount of data of the differentially compressed image data Δc1 to Δc29 will be explained.

Figure 21 shows an example of realizing fluctuations in the amount of data.
I'm here.

As the area of reference image data, 276,480 hits are provided as in the case where the amount of data is fixed as described above.

Furthermore, as areas of the differentially compressed image data Δc1 to Δc29, there are 31 areas B1 to Δc29 each having 27,200 bits.
B31 is provided. The total area is 843,200 bits.

27200X31 = 843200 bits The image area of l compression reference period is 1152000 bits as mentioned above.
The remaining 32320 bits are used for fixed length adjustment.

Reference image data is arranged in the reference image data area. This is similar to the case where the amount of data is fixed as described above.

Also, basically, the differentially compressed image data ΔC1 to Δc2
9 are placed in the areas B1 to B29, respectively, but if the image changes rapidly from an image with little movement to an image with large movement and the differentially compressed image data cannot be accommodated in the 27200-bit area, two or more area is used.

In this way, when two or more areas are used for one differentially compressed image data, the information is placed and recorded at the beginning of the control code, for example, as shown in the figure.

In the block number section, data 1 to 29 indicating differentially compressed image data using an area of 21 m or more are arranged. Further, data indicating the number of areas to be used (for example, 2 is "0" and 3 is "1") is arranged in the number section.

For example, when two areas are used for each of the differentially compressed image data ΔC5 and Δc20, the first block number part data is "5" and the number part data is "5".
0'', ``20'' as the next block number part data, and ``0'' as the number part data.

As a result, image data ΔC1 to ΔC4 are arranged in regions B1 to B4, respectively, image data ΔC5 is arranged in regions B5 and B6, image data ΔC6 to Δc19 are arranged in regions 87 to B20, respectively, and image data Δc20
is arranged in areas B2+ and B22, and image data Δc2
1 to Δc29 are shown to be arranged in regions 823 to B3+, respectively.

At the time of playback, this information is taken into the controller 110, and the addresses of the video RAMs 22a to 22c are controlled, so that the playback signal processing is performed correctly as in the case where the amount of data of each differentially compressed image data is fixed. Ru.

FIG. 22 shows another example of realizing variation in data amount.

As in the case where the amount of data is fixed, 276,480 bits are provided as the area for the reference image data.

Moreover, the area of differentially compressed image data Δcl to Δc29 is
The number of bits corresponding to each data amount is provided.

Then, differentially compressed image data ΔC provided in the image area
1 to Δc29, the control area includes video RAMs 22a to 22 which are written during playback.
The address information of 2c is arranged as, for example, 18-bit data.

During playback, this address information is taken into the controller 110 and the addresses of the videos R and AM 22a to 22C are controlled, and the playback signal is processed correctly in the same way as in the case where the data amount of each differentially compressed image data is fixed. will be carried out.

By varying the amount of data as shown in FIGS. 21 and 22, it is possible to record and reproduce differentially compressed image data with an amount of data that corresponds to the image condition, and the performance of the image data can be improved. .

In addition, from the perspective of being able to use the image area effectively, the second
Although the example in Figure 2 is better, the example in Figure 21 is better from the viewpoint of effective use of the control tai+ area.

Next, time code will be explained.

Although not mentioned above, it is conceivable to place a time code in the control area of recording data.

In the above example, the synchronization code section has 64 bits, but as shown in FIG. 23, for example, the synchronization code section has 48 bits, and a 16-pit time code section is provided between the synchronization code section and the mote code section. .

This time code section also includes a synchronization code section and a remote code section.
Similar to section F, for example, four sections are provided in one compression reference period (1 second), and the same data is allocated to the four sections.

The 16-bit data in the time code F section is, for example, absolute time W! It is assumed to represent 1 (second). In this case, each digit of a decimal number is represented by a 4-bit binary number, so-called BCD.
(Binary coded 10 ways) If it is data, it can represent time from 0 to 9999 seconds. Also, if it is 16-bit binary data, it can represent time from 0 to (2''-1) seconds.

During playback, by importing the time code recorded in this way, it can be used to control searches, display of remaining tape capacity, position adjustment during editing, etc.

In addition, by using the time suit mentioned above, 1
Although a search is possible with an accuracy of a second, by using different types of synchronization codes 1 to 4, a search can be performed with an accuracy of 1/4 second.

Furthermore, as described above, by using the variation data of each differentially compressed image data arranged in the control area, it becomes possible to search with frame accuracy, which is effective for screen adjustment during editing, for example.

Incidentally, the structure, arrangement position, and number of hits of the time code are not limited to the example shown in FIG. 23. For example, the time code structure may be expressed in hours, minutes, and seconds.

Next, by using the signal processing device shown in FIG.
The signal with the data structure of the example in Figure 4 or the example in Figure 20 is DA
An example will be described in which a tape recorded with T is digitally dubbed using two DATs.

FIG. 24 shows a configuration for digital dubbing using two DATs.

In the same figure, 201 is the DAT on the master side, and 201 is the DAT on the master side.
02 is the DAT on the slave side. These DAT201
and 202 are connected by a so-called digital audio interface DAI, and DAT2
From 01 to DAT202, in order to synchronize both,
A synchronizing signal such as BCK is supplied. Further, the DAT 201 supplies the DAT 202 with various control flags for controlling the operation of the DAT.

Further, the DAT 201 is equipped with at least a video reproduction circuit of the signal processing device shown in the example of FIG. 1, and a monitor 203 is connected to the video out terminal.

Further, the DAT 201 is provided with a dubbing start key 201a, a dubbing stop key 201b, and a dubbing period setting key 201C in addition to normal recording/reproducing keys (not shown).

First, an example will be described in which dubbing is performed for an arbitrary period while monitoring the playback screen along the flowchart of FIG. 25. In this dubbing example, in addition to the synchronization codes IA to 4A, synchronization codes IB to 4B for reverse playback must be arranged and recorded as in the example in FIG. 20.

When the dubbing start key 201a is turned on and dubbing is instructed while the DAT 201 is in the normal playback state and a moving image is displayed on the monitor 203, step 211
Then, a recording pause flag is supplied from the DAT 201 to the recording pause flag 202, and the DAT 202 is placed in a recording pause state.

Next, in step 212, the frame image data at the time when the dubbing start key 201a was turned on is sequentially read out from the image expansion section 46, and a still image is displayed on the monitor 203.

Next, in step 213, the DAT 201 starts reverse playback. Even during this reverse playback, still images continue to be displayed on the monitor 203.

Next, in step 214, it is determined whether the synchronization code 1B was entered manually. When the synchronization code IB is input manually, it is determined in step 215 whether or not the synchronization code F' 4 B has been input. When the synchronous code F' 4 B is input, in step 216, the synchronous code F' 4 B is input.
It is determined whether or not has been input.

When the synchronization code 3B is input in step 216, the reverse playback of the DAT 201 is stopped in step 217.

Next, in step 218, the DAT 201 supplies the Bose release flag to the DAT 202, and the DAT 202 is placed in a recording state.

Next, in step 219, normal playback of the DAT 201 is started, and the digital audio interface DAI
Playback data is supplied to the DAT 202 via the DAT 202, and recording is started.

Then, in step 220, display of a moving image is started on the monitor 203.

Next, in step 221, it is determined whether the dubbing stop key 201b is on. When the dubbing stop key 201b is on, in step 222, the synchronization code IA
It is determined whether or not has been input. When the synchronization code IA is input, it is determined in step 223 whether or not the synchronization code 2A has been input.

When synchronization code 2A is input, step 224
Then, a recording stop flag is supplied from the DAT 201 to the DAT 202, the DAT 202 is placed in a stopped state, and recording is stopped.

Then, in step 225, reproduction of the DAT 201(7) is stopped, and the dubbing operation is ended.

According to the dubbing example shown in FIG. 25, a still image based on the frame image data at the time when the dubbing start key 201a is turned on is displayed, so that it is possible to confirm the image at which dubbing is to be started. Furthermore, the synchronization code 4A is controlled based on the synchronization code.

It is recorded from the part immediately before 4B, and the synchronization code) 2A
, 2B, the necessary parts can be recorded efficiently.

Next, an example will be described in which dubbing for an arbitrary period is executed while monitoring the playback screen along the flowchart of FIG. 26. It should be noted that this dubbing example can be applied to recording in either the configuration shown in the example shown in FIG. 4 or the example shown in FIG. 20. In the example shown in FIG. 20, synchronization codes 1 to 4 are synchronization codes F' I A ~
Corresponds to 4A.

When the dubbing start key 201a is turned on and dubbing is instructed while the DAT 201 is in the normal playback state and a moving image is displayed on the monitor 203, step 231
Then, a recording pause flag is supplied from the DAT 201 to the DAT 202, and the DAT 202 is placed in a recording pause state.

Next, in step 232, it is determined whether synchronization code 3 has been input. When sync code 3 is manually generated,
In step 233, a pause release flag is supplied from the DAT 201 to the DAT 202, and the DAT 202 is placed in a recording state. As a result, recording of playback data supplied from the DAT 201 via the digital audio interface DAI is started.

Next, in step 234, it is determined whether the dubbing stop key 201b is on. When the dubbing stop key 201b is on, it is determined in step 235 whether synchronization code 1 has been input. When synchronization code 1 is input, it is determined in step 236 whether or not synchronization code 2 was input manually.

When synchronization code 2 is input, a recording stop flag is supplied from DAT 201 to 202 in step 237, DAT 202 is placed in a stopped state, and recording is stopped.

Then, in step 238, reproduction of the DAT 201 (7) is stopped and the dubbing operation is completed.

In the dubbing example shown in FIG. 26 as well, the control based on the synchronization code records from the part immediately before synchronization code 4 and also records up to the part immediately after synchronization code 2, so that necessary parts can be efficiently recorded.

Next, an example in which dubbing is performed during a set dubbing period will be described along the flowchart of FIG. 27. Note that this dubbing example can be applied to a dubbing in which a time code is recorded, as shown in FIG.

First, in step 241, the dubbing period setting key 20]
The dubbing start key and dubbing end time are set using c. For example, the time is input in "hours, minutes, seconds".

At step 242, the dubbing start key 201 is pressed.
When a is turned on, in step 243, DA T 2
The recording bosu flag is supplied from 01 to 202, and D
A T 202 is placed in a recording pause state.

Next, in step 244, playback of the DAT 201 (7) is started, and in step 245, the time code detected from the control area of the playback data is "dubbing start time - 1 second".
It is determined whether or not. When the time code is "dubbing start time - 1 second", it is determined in step 246 whether synchronization code 3 has been input.

When synchronization code 3 is input in step 246, a pause release flag is supplied from DAT 201 to 202 in step 247, and DAT 202 is placed in a recording state. As a result, recording of playback data supplied from the DAT 201 via the digital audio interface DAI is started.

Next, in step 24, it is determined whether the time code detected from the control area of the reproduced data is "dubbing end time + 1 second". When the time code is "dubbing end time + 1 second", in step 249, the DA
A recording stop flag is supplied from T201 to 202, and DA
T202 is set to a stopped state, and recording is stopped.

Then, in step 250, reproduction of the DAT 201 is stopped, and the dubbing operation is ended.

According to the dubbing example shown in FIG. 27, dubbing for a set period can be automatically performed. Further, by controlling based on the synchronization code, the data is recorded starting from the part immediately before synchronization code 4, and is also recorded up to the part immediately after synchronization code 2, so that the necessary part can be efficiently recorded.

In addition, in the example in FIG. 24, the DAT20 on the master side
Although the DAT 202 on the slave side may be provided with operation keys and configured to be operated by keys.

Incidentally, in the above example, only image data for a moving image is recorded, but it is also possible to record image data for a still image by switching.

In this case, as shown in FIG. 28, after certain moving image compressed image data is arranged, still image image data S1, S
2,... are recorded.

In this way, recording of image data S1, S2, etc. for still images can be easily realized using the signal processing apparatus shown in FIG. 1.

That is, the image data of each frame that is sequentially input to the RAMs 17a to 17c is read out and recorded as still image data in the data area.

In this case, in addition to performing compression processing in the image compression unit 19 to make the still image image data SL S2, . . . the same as the moving image reference image data VBN, the compression rate is reduced, Alternatively, image data for still images of higher image quality can be recorded by expanding the area and recording without compression.

According to the signal processing device shown in FIG. 1, the RA for three frames is
Since it has M17a-17c, even if the image data for still images is of high image quality, it is possible to record at least three consecutive frames, so-called continuous shooting of three images.

In addition, as shown in FIG. 28, image data S for still images
A synchronization code section and a mode code section are provided in the control area a corresponding to immediately before the start of each of S1, S2, . . . . The mote code section contains data indicating that it is a still image mote.

During playback, control is performed to shift from moving image playback processing to still image playback processing based on data indicating that the still image mode is detected from the control area of the playback data.

In the example shown in FIG. 28, image data S for still images
1. S2. ... are arranged consecutively, but they may be arranged at predetermined intervals.

In the above-mentioned embodiment, for the total number of 16 hits in the digital signal recorded and reproduced on the DAT, the I2 pit is the image area, 3 bits are the audio area, and 1 hit is the control signal. The number of hits and the placement positions are of course not limited to this.

In the above embodiment, the video signal is NTSC.
Does it show an example of handling C method?
It is also possible to handle video signals of the L format or other formats such as SEC and AM formats in the same way. In that case, changes will be required depending on the number of frames, etc. For example, when the number of frames is 2δ frames/sec, the differentially compressed image data will be 24 pieces from Δcl to Δc24.

Further, in the above-described embodiments, the recording/reproducing apparatus is a DAT, but the present invention can be similarly applied to a disc or an optically recorded recording medium.

[Effects of the Invention] As explained above, according to the first invention, the period of recording on another recording medium is controlled by the synchronization code detected from the control area of the signal to be reproduced, so that dubbing cannot be started. When dubbing is operated using the key and the dubbing end key, it is possible to control recording from slightly before a certain compression reference period to slightly after another compression reference period, so that necessary portions can be efficiently dubbed.

Further, according to the second invention, since the period of recording on another recording medium is controlled by the time code detected from the control area of the signal to be reproduced, dubbing of the period set with the dubbing setting key is performed. It can be done automatically.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a signal processing device according to the present invention, FIGS. 2 to 6 are diagrams for explaining recorded data, and FIGS. 7 to 9
The figure is a diagram for explaining the example in Figure 1, Figure 10 is a flowchart showing the operation during normal playback, Figures 11 to 15 are flowcharts showing the operation in still playback, and Figure 16 is the operation in fast forward playback. Fig. 17 is a flowchart showing the operation of fast forward playback, Fig. 18 is an explanatory drawing of the operation of slow playback, Fig. 19 is a flowchart 1 showing the operation of slow playback, and Fig. 20 is a flowchart showing the operation of reverse playback. 21 and 22 are diagrams showing the configuration of recording data when varying the amount of data, Figure 23 is a diagram for explaining the time code, and Figure 24 is a diagram showing the configuration of recording data to realize this. FIGS. 25 to 27 are flowcharts showing the dubbing operation, and FIG. 28 is a diagram showing the structure of recording data when switching and recording moving images and still images. 17a to 17c, 34...RAM 19...Image compression section 22a to 22c...Video RAM 24...Mixing circuit 25...Control data generation circuit 26...Conflict scene change detection circuit 33... Audio DSP 41...Separation circuit 42...Control data discrimination circuit 46...Image decompression section 110...Controller 120...RAM controller 130.201.202...DAT ]40...Keyboard Monitor still playback (1st still playback) Fig. 11 Still playback (3rd still playback) Fig. 3 Fig. 7 File code Fig. 23

Claims (2)

[Claims] (1) Recorded as a digital signal of N bits (N is an integer), a part of the N bits forms an image area, an audio area, and a control area, respectively, and the image area in each compression reference period is , compressed digital video signals for multiple screens constituting a moving image are arranged, and digital audio signals for the compression reference period are arranged in the audio area in each compression reference period,
In a dubbing device that reproduces from one recording medium and records on another recording medium, a plurality of types of synchronization codes are arranged at predetermined intervals in the control area in each compression reference period. a detection means for detecting the synchronization code from the control area of the signal reproduced by the signal; and a control means for controlling the recording period on the other recording medium based on the synchronization code detected by the detection means. dubbing equipment. (2) It is recorded in the state of a digital signal of N bits (N is an integer), and a part of the N bits forms an image area, an audio area, and a control area, respectively, and the image area in each compression reference period is , compressed digital video signals for multiple screens constituting a moving image are arranged, and digital audio signals for the compression reference period are arranged in the audio area in each compression reference period,
In a dubbing device that reproduces a time code from one recording medium and records it on another recording medium, the control area in each compression reference period contains a time code. A dubbing device comprising: a detection means for detecting the time code from the control area; and a control means for controlling a recording period on the other recording medium based on the time code detected by the detection means.