JPH0918827A - Image recording and reproducing device - Google Patents

Abstract

PURPOSE: To provide an image recording and reproducing device of high image quality which always holds the relation of the phases of image data and a reference signal by shifting the phase of the reference signal corresponding to image data according to image processing time when the image processing time for an image compression, etc., is taken. CONSTITUTION: From the burst signal fscA separated in a synchronizing signal separator circuit 201, the signal fscB whose phase is locked in a PLL 202 is generated. By a phase-shift circuit 203, the signal fscC in which the phase of the fscB is delayed by 180 deg. and is advanced by 180 deg. at the time of a recording and at the time of a reproduction, respectively, is generated. The fscB and fscC are selectively outputted as a fscD for each line of an image signal in a selection circuit 204 and the signal is synchronized with the synchronizing signal generated in a synchronizing signal reproduction and generation circuit 205 in a synthetic circuit 206. By the above processing, the phase of a reference signal is delayed by 180 deg. and is advanced by 180 deg. at the time of the recording and at the time of the reproduction, respectively, for a reference signal 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a device for recording or reproducing a digitized video signal, such as a digital VTR and a device connected to the digital VTR, for recording, reproducing or transmitting digital image data. The present invention relates to an image recording / reproducing apparatus that performs the processing of.

[0002]

2. Description of the Related Art A magnetic recording / reproducing apparatus for digitally encoding a video signal to record / reproduce, so-called digital VTR.
(Hereinafter DVTR), for example, proposed SM
PTE Standard for Digital Video
Recording 1/2 inch type D-5 component format 525/60 and 625
/ 50 (SMPTE279M, SMPTE journal,
May 1995) (PROPOSED SMPTE STANDARD for Digi
tal Video Recording 1 / 2-in Type D-5 ComponentForma
t 525/60 and 625/50 (SMPTE279M, SMPTE Journal, May
There is a so-called D5 VTR described in 1995)).

This DVTR is a DVTR for recording a component video signal sampled with 8 bits or 10 bits without compressing image data. On the other hand, recently, next-generation broadcasting systems such as EDTV2 system and HD system are about to start. These new broadcasting systems carry several times as much information as the current broadcasting systems. Therefore, in order to record the image data of these new broadcasting systems in the DVTR, it is necessary to use the correlation of the image data to compress and record the image by high efficiency coding. Especially E
Regarding the DTV2 system, although a progressive camera and a progressive monitor compatible with the progressive scanning system have already been developed, the VTR has not yet been developed.
As the VTR of EDTV2, for example, D1-VTR is 2
It is the current situation to operate by using a stand.

Therefore, it has been considered that a new VTR image data is recorded by attaching an image data compression adapter (hereinafter referred to as a compression adapter) to a VTR which is not compressed, for example, the above-mentioned D5 VTR. In this case DV
It is premised that the circuits inside the TR and the input interface format of the image data input to the DVTR and the interface format of the image data output from the DVTR are not changed. Therefore, all processing for recording in the DVTR must be performed on the compression adapter side.

As concrete processing, in the compression adapter, compression / expansion processing of image data (hereinafter referred to as compression processing) and DVT for recording the compressed image data in the DVTR are performed.
A process for converting the arrangement of data into an interface format with R (hereinafter, format process) is performed. At this time,
Almost no processing other than image data such as compression processing and format processing was performed.

[0006]

However, in the above-mentioned conventional method, only the image signal is processed, and the image processing requires a delay time to some extent. Therefore, the image signal and the corresponding color frame phase are deviated, When compressed, recorded, reproduced and expanded, the problem that the image is remarkably deteriorated occurs.

The above-mentioned conventional problems will be described below. In the description, the case where the image signal to be recorded is of the NTSC system (hereinafter, NTSC) is taken as an example. The color frame phase of NTSC makes a cycle of four fields. The DVTR records both image data and color frame phase. Usually 1
The image data of the field is divided into a plurality of tracks and recorded, and the color frame phase is recorded by inserting a color frame pulse (15 Hz) into the CTL signal. The color frame phase of the image data currently being reproduced can be known by detecting the color frame pulse during reproduction.

When a problem occurs, for example, the original image signal to be recorded is a composite signal, and after YC separation, it is recorded in the component DVTR,
Consider the case where the reproduced signal of is converted into a composite signal again. Due to signal processing, when YC separation is performed, it is completely Y
(Luminance signal) and C (color difference signal) cannot be separated, and Y is C
Or a phenomenon such as C leaking into Y occurs. This is only due to the nature of the composite signal. The reason for recording a color frame is to record the color frame phase at the time of recording and attach the color frame signal in the same way as the original image signal at the time of reproduction, that is, if the same burst signal as the original image signal is added for reproduction. Image quality deterioration due to leakage, etc. can be minimized. This is the reason for recording the color frame phase. However, if a color frame phase different from the original signal is added, the errors accumulate and the image quality deteriorates significantly.

When the signal processing of the image data by the compression adapter takes two field periods, the image data of each field is FA0, FA1, FA2, FA3, F in chronological order.
B0, FB1, FB2, FB3, color frame phase of each field is PA0, PA1, PA2, PA3, PB
If 0, PB1, PB2, and PB3, the image data is delayed by two field periods at the time of recording, so that the field F
The color frame phase of PA2 is added to the image data of A0. Similarly, P is added to the image data of the field FA1.
A3 color frame phase, field FA2 image data has PB0 color frame phase, field FA
The image data of 3 has a color frame phase of PB1.

In the above case, when a composite signal is formed from reproduced image data and color frame information, for example, a color burst signal is inverted from a signal before recording. In such a state, a state in which a color signal leaks into a luminance signal or the like occurs, which causes a problem that a remarkable deterioration in image quality occurs. When an image data compression adapter (hereinafter referred to as a compression adapter) is attached to the DVTR, the image compression process requires time, so that the image data and the color frame phase are displaced as described above.

The above-mentioned conventional problems will be described in detail below with reference to the drawings. FIG. 5 is a conceptual diagram of an image recording / reproducing apparatus using a compression adapter and a DVTR. The flow of signals for recording and reproducing image data will be described with reference to FIG. In FIG. 5, 501 is a compression adapter, 502 is a DVTR, 50
3 is image data input from outside the system, 504 is a reference signal of the image data 503, and 505 is the image data 50.
3 is image data compressed by the compression adapter, 506 is a reference signal of the image data 505, 507 is image data reproduced from the DVTR 502, and 508 is the compression adapter 501.
The image data 507 is the expanded image data.

Here, the reference signal 504 is the image data 50.
3 and the image data 508, the color frame phase information signal. FIG. 6 is a block diagram of the internal configuration of the compression adapter 501. In FIG. 6, 400 is an image data processing means. The image data processing means 400 includes a compression circuit 407 for compressing and expanding an image, a field memory 408 capable of storing compressed image data for one field,
409, interface circuit 410, field memory 41 capable of storing compressed image data for one field
It consists of 1, 412.

Reference numeral 401 is input image data, which is the same as the image data 503 in FIG. 5, and 402 is compressed image data, and the image data 505 in FIG.
5, 403 is the compressed image data, 403 is the same as the image data 507 of FIG. 5, 404 is the decoded image data, and the image data 508 of FIG.
Is the same as Reference numeral 405 is a reference signal for the image data 401, which is the same as the reference signal 504 in FIG. 5, and 406 is a reference signal for the image data 402, which is the same as the reference signal 506 in FIG. In FIG. 6, the symbols A, B, C, D, and E are attached to each point in the flow of image data.

The input image data 401 is compressed by a compression circuit 407. The compressed data is written in the field memories 408 and 409. At this time, so-called shuffling processing is performed in which the arrangement of the image data is switched. For writing and reading image data, 40
8 and 409 are performed alternately. That is, the compression circuit 407
As the first process, the data for one field is continuously written in 408, the data for one field written in the previous field in 409 is continuously read for one field.

As the second processing in the compression circuit 407, when data for one field is continuously written in 409, the data for one field written in the previous field in 408 is continuously written for one field. Read out. The compression circuit 407 repeats the first processing and the second processing for each field. The signal at the point B is delayed by one field from the signal at the point A in order to write to and read from the field memory.

The interface circuit 410 is a DVTR5.
02 is a format circuit for making the optimum data format for recording compressed data in 02. In this circuit, processing for converting the arrangement of the compressed data output from the compression circuit 407 for recording in the DVTR is performed. The compressed image data input to the interface circuit 410 is written in the field memories 411 and 412. Writing and reading of compressed image data is performed by the field memory 411 and the field memory 412.
And alternate. That is, the interface circuit 41
As the first processing of 0, 1 is stored in the field memory 411.
When data for one field is continuously written, the data for one field written in the previous field in the field memory 412 is continuously read for one field.

As the second process, when the data for one field is continuously written in the field memory 412, the data for one field written in the previous field in the field memory 411 is continuously read for one field. Be done. The interface circuit 410 repeats the first processing and the second processing for each field. The signal at the point C is delayed by one field from the signal at the point B in order to write to and read from the field memory.

By the above processing, the signal at point C is delayed by two fields from the signal at point A. On the other hand, the reference signal 405 and the reference signal 406 have no timing delay. In this case, in NTSC, the color frame phase makes one round in four fields, so if there is a difference of two fields,
The color frame phase of the image data and the reference signal is out of phase by 180 degrees.

In the DVTR, the color frame phase signal is C
Since the information is recorded on the TL signal, the information of the image signal does not match the information of the color frame phase signal.
The color frame is reproduced with the phase shifted. If the color frame phase shifts by 180 degrees, a color burst signal shifted by 180 degrees from the original data will be added when forming a composite signal. Then Y, BY, RY
At the time of separation, there is a problem that a color signal leaks into a luminance signal, which causes remarkable deterioration of image quality.

At the time of reproduction, the interface circuit 410
The compression circuit 407 and the compression circuit 407 perform the opposite processing to that at the time of recording, but the time required for the processing is the same as at the time of recording. During reproduction, the signal flow of the image data passes from the image data 403 (point D) through the interface circuit 410, is delayed by one field at the interface circuit 410 (point E), and is also one field at the compression circuit 407 (point F). Be late. Therefore, the signal at point F is delayed by two fields with respect to the signal at point D.

As described above, the above-mentioned conventional image recording / reproducing apparatus has a problem that the image signal and the color frame phase information of the image signal are deviated from each other, so that the image is significantly deteriorated. The present invention solves the above-mentioned conventional problems, and provides an image recording / reproducing apparatus in which the image signal and the color frame phase information of the image signal match each other even when it takes time to process the image signal without causing image quality deterioration. The purpose is to provide.

[0022]

In order to achieve the above object, the present invention provides an image data processing means for processing image data in a P field period and an N field cycle in which a phase is associated with the image data. Reference signal regenerating means for generating a reference signal whose phase goes around by delaying the phase by P / N * 360 degrees, and reference signal whose phase is delayed by the image data and the reference signal regenerating means processed by the image data processing means. And image recording means for recording and.

Further, the image data processing means for processing the image data in the P field period, and the reference signal having a phase of one cycle in the N field cycle, which is associated with the phase of the image data, are set to P / N * 360 degree phase. A reference signal regenerating unit that precedes and generates image data that reproduces image data in synchronization with the reference signal whose phase precedes by the reference signal regenerating unit and inputs the reproduced image data to the image data processing unit. And means.

[0024]

According to the image recording / reproducing apparatus having the above-mentioned structure, the image data processing means for processing the image data in the P field period has N phase information of the image data at the time of recording.
P / N * is the reference signal whose phase makes one cycle in the field cycle.
The reference signal is generated by delaying the phase by 360 degrees, and the reference signal is apparently delayed by the P field period, and is recorded while maintaining the phase relationship between the image data of the input stage and the reference signal.

Further, at the time of reproduction, a reference signal having a phase cycle of N field cycles, which has phase information of the image data, is supplied to the image data processing means for processing the image data in the P field period P / N *. The reference signal regenerating means for generating the phase by 360 degrees in advance leads the reference signal by an apparent P field period, and the phase relationship between the reproduced image data and the input reference signal is recorded. It is output as the phase relationship between the data and the reference signal.

[0026]

An embodiment of the present invention will be described below with reference to the drawings. First, the case of recording image data will be described. FIG. 1 is a system configuration diagram of a recording side of an image recording / reproducing apparatus according to an embodiment of the present invention. FIG.
In the figure, 101 is a compression adapter, 102 is an image data processing means, and 103 is a reference signal regeneration means as its internal configuration. Further, 104 is a DVTR as an image recording means, and 105 is a rotary head, 106 is a rotation control circuit, and 107 is a CTL head as its internal configuration. Of course, the DVTR 104 shows not only the illustrated configuration but also a simplified one here.

Next, the signal flow of FIG. 1 will be described. The image data 10 to be recorded and the reference signal 1 having the color frame phase information of the image data 10 are input to the compression adapter 101. The image data 10 is output as the image data 20 after the processing time of two fields. The reference signal 1 is an NTSC reference signal including a color burst signal and a horizontal blank signal and a vertical blank signal, and the color frame phase information of the image data 10 can be known from these signals. The reference signal regenerating unit 103 shifts the color frame phase by an amount corresponding to the delay of the image data 20 with respect to the image data 10, and outputs it as the reference signal 2.

The DVTR 104 records the image data 20 on the tape by using the rotary head 105. At the same time, the color frame phase information of the reference signal 2 is transferred to the CTL head 107.
Record on tape using. In this embodiment, the color frame phase is recorded by inserting a color frame pulse (15 Hz) into the CTL signal for detecting the track position during reproduction. The rotation control circuit 106 controls the rotation of the rotary head circuit 105, but is not particularly important in this embodiment during recording.

The image data processing means 102 is the same as the image data processing means 400 of FIG. The image data 10 input to the compression adapter 101 is subjected to image compression processing and format processing by the image data processing means 102,
The image data 20 is output and input to the DVTR 104. At this time, the time required for the image compression processing and the format processing, that is, the delay of the image data 20 with respect to the image data 10 is 2 fields in this embodiment.

The reference signal regenerating unit 103 delays the color frame phase information of the reference signal in response to the delay of the image data by the image data processing unit 102.
The actual processing of the reference signal regenerating unit 103 does not delay the reference signal 1 to generate the reference signal 2, but regenerates the reference signal so that the reference signal is apparently delayed.

Since the image processing time of the image data processing means 102 is a two-field period, it corresponds to a color frame phase shift of 180 degrees in NTSC. Therefore, in the reference signal regenerating unit 103, 18 is applied to the reference signal 1.
A signal whose phase is shifted by 0 degrees is regenerated and output as the reference signal 2. For example, in NTSC, the data input to the image data 10 is FA0, FA for each field.
1, FA2, FA3, FB0, FB1, FB2, FB3
And In addition, the reference signal 1 corresponding to the
0, PA1, PA2, PA3, PB0, PB1, PB
2, PB3.

Since the image data processing circuit 102 takes two field periods for processing, after two field periods, the FA
Image data 2 is output in the order of 0, FA1, FA2, FA3. Further, since the reference signal regenerating unit 103 also shifts the phase of the reference signal for two field periods, PA0,
The reference signal 2 is output in the order of PA1, PA2, PA3. That is, the phase relationship between the image data and the reference signal is maintained.

Therefore, the image data and the corresponding accurate color frame phase are recorded in the DVTR 104. When the reference signal generation means 103 shown in this embodiment is not provided, that is, in the conventional example shown in FIG. 5, since there is no reference signal phase adjustment function, FA0 of the image data 2 output from the image data compression means 102, For FA1, FA2, FA3, the reference signal 2 of the output of the compression adapter 101 is P
A2, PA3, PB0, PB1 and the phase relationship between the image data and the reference signal cannot be maintained.

In this embodiment, the phase relationship between the image data and the reference signal is maintained by the function of the reference signal regenerating means 103. The DVTR 104 divides the image data 20 into a plurality of tracks and is recorded by a plurality of recording heads on the rotary head 105. 1 for D5 VTR
The field data is 1.5 with 8 heads.
It is divided into 12 tracks by rotation and recorded. Also CT
The L head 107 detects the color frame phase information obtained from the reference signal 2 and relates the color frame of the image data 20 to the CTL track at the lower end of the tape in relation to the position on the tape where the image data 20 is recorded on the tape. Record phase information.

In the present embodiment, as described above, the color frame phase is the color frame pulse (15
Hz) and record. The color frame phase of the image data currently being reproduced can be known by detecting the color frame pulse during reproduction. Next, with reference to FIG. 2, the configuration of the reference signal regenerating unit 103, which is the main feature of the present invention, will be described in detail. FIG. 2 is a block diagram showing details of the reference signal regenerating unit 103. In FIG. 2, 201 is a synchronizing signal separation circuit, 202 is a PLL (phase locked loop circuit), 203 is a phase shift circuit, 2
Reference numeral 04 is a selection circuit, 205 is a synchronization signal regeneration circuit, 206
Is a synthesis circuit.

For the sake of explanation, fscA, f
The symbols scB, fscC, and fscD are added. The reference signal 1 is an NTSC reference signal including a color burst signal, a horizontal blank signal and a vertical blank signal. The sync signal separating circuit 201 extracts the color burst signal fscA from the reference signal 1 and sends it to the PLL 202, and also extracts the horizontal blank signal and the vertical blank signal from the reference signal 1 and sends it to the sync signal reproducing circuit 205.

The PLL 202 outputs a signal fscB whose phase is locked to the color burst signal and which has the same frequency as the subcarrier frequency. The output of PLL 202 is
It is input to the selection circuit 204 and the phase shift circuit 203. The phase shift circuit 203 generates a signal fscC in which the phase of fscB is shifted by 180 degrees. In this embodiment, the phase shift circuit 20
3 uses the inverting circuit to generate fscC.
In the selection circuit 204, fscB is added to each line of each field.
Alternatively, it is selected which of fscC is attached. The selection control is generated by the synchronization signal regeneration circuit 205 described later. In the selection circuit 204, the apparent reference signal is 180
Either fscB or fscC is selected as if it was delayed.

The sync signal regeneration circuit 205 apparently delays the input horizontal sync signal and vertical sync signal by two field periods to generate a horizontal sync signal and a vertical sync signal. In addition, the selection circuit 204 is fscB or f
A selection control signal for selecting which of scC is selected is generated. The synthesizing circuit 206 outputs the color burst signal fscD output from the selecting circuit 204 and the sync signal regenerating circuit 205.
Are combined to form a reference signal in the form of a regular NTSC signal including a color burst signal, a horizontal synchronizing signal and a vertical synchronizing signal.

By the above processing, the reference signal 2 is a signal whose phase is delayed by 180 degrees with respect to the reference signal 1. Next, the reproducing side in this embodiment will be described. FIG. 3 is a system configuration diagram on the reproducing side of the image recording / reproducing apparatus in this embodiment. In FIG. 3, 301 is a compression adapter,
302 and 303 are inside the compression adapter 301, and
Reference numeral 02 is an image data processing unit, 303 is a reference signal regenerating unit, 304 is a DVTR as an image reproducing unit, 305,
306 and 307 are inside the DVTR 304, and 305
Is a rotary head, 306 is a rotation control circuit, and 307 is a CTL.
Head. At the time of reproduction, the configuration is the same as that at the time of recording, but the processing and signal flow of the reference signal regenerating unit 303 are different.

As a signal flow, the reference signal 3 is input to the compression adapter 301. The reference signal 3 is an NTSC reference signal including a color burst signal and a horizontal blank signal and a vertical blank signal, and outputs it as the reference signal 4 by advancing the phase corresponding to the delay of the image data 30 with respect to the image data 40. The reference signal 4 is the rotation control circuit 30.
6 is input. On the other hand, the color frame phase information detected by the CTL head 307 is also input to the rotation control circuit 306. The rotation control circuit 306 locks the color frame phase of the reference signal 4 and the phase of the rotary head 305 based on the two input signals, and reproduces the image data 40 of the color frame phase corresponding to the reference signal 4. That is, the color frame phase of the image data 40 precedes the reference signal 3 by the time required for the processing of the image data processing means 302. In the present embodiment, since the time required for the processing of the image data processing means 302 is two field periods, the color frame phase of the image data 40 precedes the reference signal 3 by two field periods, that is, 180 degrees. .

The image data processing means 302 is a circuit which performs the reverse processing of the image data processing means 102 of FIG. D
This is a circuit for converting the sequence of data that can be expanded from the VTR interface (the reverse of the format processing) and expanding the compressed data. Image data processing means 102
Since it is the reverse process of, the process requires two field periods.

The reference signal regenerating unit 303 performs a process of advancing the phase information of the reference signal corresponding to the delay of the image data by the image data processing unit 302. The reference signal regenerating unit 303 can be realized by advancing the phase shift of the phase shift circuit 203 by 180 degrees in FIG. Symbols are used for explanation. FA0, FA1, FA2, FA3, FB0, FB1,
FB2, FB3, FC0, FC1, FC2, FC3. The corresponding reference signals are PA0, PA1, PA
2, PA3, PB0, PB1, PB2, PB3, PC
0, PC1, PC2, PC3. Reference signal 3 is PB
When 0, PB1, PB2, PB3, PC0, PC1 make one cycle in four fields, the reference signal 4 precedes by 180 degrees, so that the output of the reference signal generating means 303 is PA2, P2.
A3, PB0, PB1, PB2, PB3. The image data 40 is FA2, FA3, FB according to the reference signal 4.
0, FB1, FB2, FB3 are reproduced. Since the image data processing means 302 is delayed by two fields, the image data 3 is FB0, FB1, FB2, FB3, FC0, F.
C1, FC2, FC3, and the reference signal 3 and the color frame phase match.

As described above on the recording side and the reproducing side, according to this embodiment, the phase of the image data and the corresponding reference signal (color frame phase) always match. In the present embodiment, the case where the image signal (video signal) is the NTSC system has been described as an example, but the essence of the present invention is that the reference signal is equivalent to the processing time of the image data during recording. Since it is delayed and preceded at the time of reproduction, it is possible to cope with image signals (video signals) of other broadcasting systems. For example, in the case of the PAL system, since the color frame phase makes a round in 8 fields, assuming that the processing time of image data is 2 field periods,
In recording, the phase of the reference signal may be delayed by 90 degrees, and in reproducing, the phase of the reference signal may be advanced by 90 degrees.

Generalizing this, the P field (P
Is a P / N * 36 at the time of recording, for the image data processing means having a delay of a positive real number period, a reference signal that makes a cycle with a phase of N field (N is a natural number) cycle.
The phase may be delayed by 0 degree and advanced by P / N * 360 degree phase during reproduction. An example of the reference signal regenerating means for PAL will be described below. Figure 4 is PAL
It is a block diagram of the reference signal regeneration means of. In the case of PAL, the PLL of the block diagram of the reference signal regeneration means of FIG.
The parts of 202, the phase shift circuit 203, and the selection circuit 204 may be implemented by the PLL 602 and the selection circuit 604 as shown in FIG.

In FIG. 4, reference numeral 601 denotes a sync signal separation circuit, which has the same function as the sync signal separation circuit 201. 6
Reference numeral 02 is a PLL, 604 is a selection circuit, and 605 is a synchronization signal regeneration circuit, which has the same function as the synchronization signal regeneration circuit 205. A combining circuit 606 has the same function as the combining circuit 206. Also, for the sake of explanation, fs is attached to each point in the figure.
The symbols cAA, fscBB, fscCC, fscDD are attached.

The difference from the case of NTSC in FIG.
L602 is a color burst signal extracted from the reference signal 1 which is the output of the synchronization signal separation circuit 601 and is internally V
It is multiplied by 4 using CO and then divided by 1/4. The phase of the color burst signal corresponding to the processing time of the image signal is delayed by 90 degrees with respect to fscAA at the time of frequency division to generate fscBB, and is advanced by 90 degrees at the time of reproduction to generate fscBB. Adjust. fs
In the case of PAL, cCC has a phase difference of 9 degrees with fscBB because the two burst signals have a phase difference of 90 degrees for each line.
It is the other color burst signal that differs by 0 degrees. fs
The ccCC can be easily created during frequency division when generating fscBB. The subsequent processing is almost the same as that described with reference to FIG.

Also in the configuration of FIG. 4, the phase of fscBB is the phase when dividing, and the phase is 18 when recording with respect to fscAA.
It is delayed by 0 degree to generate fscBB and 180 during playback.
NTS by generating fscBB in advance
It is compatible with the C method. Further, in the present embodiment, the case where the processing of the image signal takes two field periods has been described as an example, but the processing period may not be an integral multiple of one field period and corresponds to an arbitrary processing time of the image processing. Thus, the phase of the reference signal may be delayed during recording and advanced during reproduction.

Although the image processing in this embodiment is image compression, the present invention can be applied to other image processing. Further, in this embodiment, one phase shift circuit is used for delaying the phase, but by using a plurality of phase shift circuits, it is possible to cope with various broadcasting systems and image data processing periods.

[0049]

As described above, according to the image recording / reproducing apparatus of the present invention, the reference signal is delayed by the time required for the image data processing means at the time of recording and sent to the image recording means. And the phase information of the reference signal corresponding thereto is recorded. Further, at the time of reproduction, the reference signal is preceded by the time required for the image data processing means and sent to the image reproduction means, and the image data after the image data processing means can match the phase relationship of the reference signal.

Therefore, the image data and the phase of the reference signal always match each other, recording and reproduction can be performed without deterioration in image quality, and high image quality can be maintained, which is extremely advantageous in practical use. .

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a recording side of an image recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of reference signal regenerating means in the embodiment.

FIG. 3 is a system configuration diagram of a reproducing side of the image recording / reproducing apparatus in the embodiment.

FIG. 4 is a PAL of the reference signal regenerating means in the embodiment.
Block diagram of the case

FIG. 5 is a conceptual diagram of an image recording / reproducing apparatus using a conventional compression adapter and DVTR.

FIG. 6 is a block diagram of the internal configuration of a conventional compression adapter.

[Explanation of symbols]

 101 compression adapter 102 image data processing means 103 reference signal regeneration means 104 DVTR 201 synchronization signal separation circuit 202 PLL 203 phase shift circuit 204 selection circuit 205 synchronization signal regeneration circuit 206 synthesis circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shiro Kato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. An image data processing means for processing image data in a P field period, and a reference signal, which has a phase in relation to the image data and has a cycle of N field cycles, is P / N * 360 degree phase. Image recording / reproducing having reference signal regenerating means for delaying the generation of the signal, and image recording means for recording the image data processed by the image data processing means and the reference signal having the phase delayed by the reference signal regenerating means. apparatus. 2. An image data processing means for processing image data in a P field period, and a reference signal, which has a phase with the image data and has a cycle of N field cycles, is P / N * 360 degree phase. And a reference signal regenerating means for generating the image data in synchronism with the reference signal whose phase is preceded by the reference signal regenerating means, and the reproduced image data to the image data processing means. An image recording / reproducing apparatus having an image reproducing unit for inputting.