JPS61107893A - Information signal recording disk reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of color reproducibility by thinning out and transmitting to one field the picture element data for one frame which separately samples and quantizes a luminance signal and two kinds of color difference signals, and reproducing the disk recorded in the sequence of surfaces. CONSTITUTION:An A/D converter 30 A/D-converts based upon the sampling pulse from a sampling pulse generating device 32, converts to picture element data and supplies to a memory circuit 33. In the circuit 33. a writing/reading control pulse and a latch pulse generated by a memory reading/writing controller 35 are supplied, and luminance picture element data and two kinds of color difference picture element data reproduced per rotation of a disk 20 are written in the exclusive-use field memory. A reproducing luminance signal and two kinds of reproducing color difference signals R-Y and B-Y D/A-converted and removed by DA converters 39-41 are supplied to an encoder 42, here a compound synchronizing signal and a color burst signal from a synchronizing signal generating device 34 are applied, and converted to a color video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to information signal recording discs, and more particularly to an information signal recording disc reproducing apparatus capable of reproducing color still images with high quality.

2. Description of the Related Art Conventionally, analog information signals such as composite video signals and audio signals are subjected to frequency modulation (FM) and recorded on concentric or spiral tracks as, for example, changes in geometric shapes. (referred to as a "disk"). This disc is called a video disc because the recorded information is mainly a composite video signal (and the recording track contains a modulated wave signal obtained by performing analog modulation, in which a carrier wave is modulated with an analog information signal). A composite video signal, etc. is recorded on the video disc. For example, an address signal for random access, etc. is recorded during a specific period within the vertical blanking period of the composite video signal, and the address signal is a code. However, since the main body of recorded information is analog-modulated composite video signals, etc., tracks such as the recording track of this video disc will be referred to as [analog recording track] for convenience in the specification. It shall be as follows.

Among such video disks, there is known a disk in which a composite color video signal of the same field (or the same frame) is recorded on one track for one rotation, and by repeatedly playing back the tracks of this disk, the movement can be recorded. Disk playback devices that can obtain color still images without wobbling are known (for example, Japanese Patent Application No. 1983-489).
No. 26, etc.).

Problems to be Solved by the Invention However, the above-mentioned video disc playback device is capable of producing a video disc in which an analog composite color video signal, in which a luminance signal and a carrier color signal are band-sharing multiplexed, is frequency-modulated and recorded. The recording and playback band is narrow, and distortion and beat interference occur in the playback signal due to band sharing multiplexing.Furthermore, in the NTSC and PAL systems, the hue is affected by the phase of the playback carrier color signal relative to the phase of the color burst signal. Therefore, if a phase shift occurs in the reproduced color burst signal, there is a problem that color reproducibility deteriorates.

Therefore, the present invention thins out one frame's worth of pixel data, in which a luminance signal and two types of color difference signals are separately sampled and quantized, into one field, and transmits the same, and reproduces a disc recorded in frame sequential manner. Therefore, it is an object of the present invention to provide an information signal recording disk reproducing device that solves the above problems.

Means for Solving the Problems The information recording disk reproducing apparatus according to the present invention generates a luminance signal for one frame regarding a still image and two types of color difference signals in a first... Second
From the pixel data obtained by this, a total of one field's worth of luminance pixel data including the pixel data of the first and second fields, respectively, and the i-th and second field pixel data are obtained. The luminance pixel data of the first field, the luminance pixel data of the second field, and the first and second color difference pixel data of the first field are included in the first and second color difference pixel data for a total of one field each including pixel data of the field. Information in which the second color difference pixel data and the first and second color difference pixel data of the second field are switched every field and are sequentially recorded in a spiral or concentric track in time series at a period of 4 fields. A device for reproducing a signal recording disc, comprising a reproducing means for reproducing already recorded signals on the disc, a pixel data demodulating means, a memory circuit, a memory control means, and a video signal generating means.

The luminance pixel data and the first and second color difference pixel data demodulated from the reproduced signal by the pixel data demodulation means are serially supplied to a memory circuit and written therein, and then
The memory control means reads out the luminance pixel data at the first sampling frequency, and reads out the two types of color difference pixel data in parallel at the second sampling frequency. Each pixel data read from the memory circuit is converted by the video signal generating means into a reproduced color video signal compliant with a desired television system and output.

Effect One field of luminance pixel data and one field of two types of color difference pixel data written in the memory circuit are as follows: During the first and second field playback periods, the first and second field pixel data are Mixed and thinned out pixel data is supplemented with surrounding pixel data,
Luminance pixel data is read out at the first sampling frequency, and two types of color difference pixel data are read out at the second sampling frequency. Since this second sampling frequency is 1/2 times as high as the first sampling frequency, the band of the reproduced color difference signal is wider than the conventional one. Further, the luminance pixel data of the first field, the luminance pixel data of the second field, the first and second chrominance pixel data of the first field, and the first and second chrominance pixel data of the second field are transmitted for one field period. This is compared to a conventional video disc playback device that plays back a frequency-modulated wave signal that is frequency-modulated using a band-sharing multiplexed video signal. , the color difference signal and the luminance signal are not picked up and reproduced at the same time. An embodiment of the present invention will be described below with reference to the drawings.

Embodiment FIG. 1 shows a block system diagram of an embodiment of the reproducing apparatus of the present invention. In the figure, an information signal recording disk (hereinafter referred to as disk) 20 is a disk on which digital recording tracks and analog recording tracks (to be described later) are mixed together, and each pixel data described above is time-division multiplexed on the analog recording track. It is characterized in that a frequency-modulated wave signal that is frequency-modulated by a signal is recorded. First, the recorded information content of the disc 2o to be reproduced (particularly the recorded information content of the analog recording track) and the recording system will be explained.

FIG. 6 schematically shows an example of recorded information contents of a disc to be reproduced. In the figure, one rotation of the disk 1 has four field periods, and in the first one field period F1, luminance pixel data Y1 of the first field among the pixel data for one field in total, which will be described later, is recorded in chronological order. Then, in the next one field period F2, the color difference pixel data (RY)+ of the first field among the color difference pixel data related to the color difference signal RY for a total of one field, which will be described later, and the total one, which will be described later.
Among the color difference pixel data related to the field worth of color difference signals B-Y, the first field color difference pixel data (B-Y)+
are synthesized and recorded alternately in time series every 1/2 horizontal horizontal scan.

Furthermore, in the next one field period F3, the luminance pixel data Y2 of the second field is recorded in chronological order.
During the last field period F4 during rotation, the color difference pixel data (RY) 2 and (B-Y) 2 of the second field are synthesized and recorded alternately in time series every 1/2 horizontal scanning period. has been done. The above luminance pixel data Y + *
Y 2 t2 types of color difference pixel data (RY)! .

(RY)2. (B Y)+ and (B-Y)z are digital data obtained by respectively sampling and quantizing the luminance signal and two types of color difference signals regarding the same still image, and are actually digital-to-analog converted. It is then frequency modulated and recorded in the form of a frequency modulated wave signal on spiral or concentric tracks.

Further, each of the pixel data regarding one still image may be recorded on one track, or one still image may be repeatedly recorded on a plurality of tracks multiple times. Therefore, each of the above-mentioned pixel data related to the - still image is recorded on one track destined for the rotation of the disk. Among them, the luminance pixel data Y+ and Y2 are obtained by sampling and quantizing the luminance signal for one frame. Consists of one field of pixel data obtained by thinning out the remaining one field, and the same frequency as the sampling frequency after thinning (for example, 4.5MH7)
In contrast, two types of color difference pixel data (R-Y
)+ , (RY)2.

(B-Y)+ and (B-Y)2 are one field of pixel data obtained by separately sampling and quantizing the color difference signals (R-Y) and (B-Y) for one frame, respectively. It consists of the remaining one field after being thinned out, and is transmitted at a frequency that is twice the sampling frequency after thinning out (for example, 4.5MH7). Therefore, if the still image is assumed to be an image such as a keyhole for convenience of illustration, then if the already recorded signal is reproduced as it is during reproduction of each one field period shown by Fl and F3 in FIG. 6, then the image shown in FIG. A reproduced image based on the luminance signal as shown in FIG. As shown in , the color difference signal (
Each playback/image of (RY) and (B-Y) rotates the time axis by 1/
It is obtained by compressing the image into two and dividing it into two in the vertical direction.

Note that the transmission order of each pixel data described above is not limited to the order shown in FIG. 6; in short, the first field luminance pixel data Y+, the second field luminance pixel data Y2, . Two types of color difference pixel data (R-
Y)+ and (B-Y)+, and two types of color difference pixel data (R-Y)2 and (B-Y)2 in the second field are 1
It is sufficient if the data is switched for each field and transmitted sequentially in a time-series manner at a period of four fields.

Next, the recording system of the disc will be explained. FIG. 8 shows a block system diagram of an example of a recording system for recording and forming a disc. In the figure, the three primary color signals of red (R), green (G) and blue (B) obtained by transporting a subject (still image) by a television camera 3 are supplied to a matrix circuit 4, where a luminance signal Y
, are converted into two types of color difference signals R-Y and B-Y, respectively.

The luminance signal Y is supplied to the AD converter 8 through a low-pass filter 5 with a cutoff frequency of 8 MH2. On the other hand, the color difference signals R-Y and B-Y are separately supplied to AD converters 9 and 10 through low-pass filters 6 and 7 having a cutoff frequency of 4 MHz, respectively. On the other hand, synchronization signal generator (SSG) 1
Based on the synchronization signal from 1, the sampling pulse generator 12 generates a first sampling pulse with a repetition frequency of 9MH7 and a second sampling pulse with a repetition frequency of 4.5MHZ, and converts the first sampling pulse into AD. The second sampling pulse is supplied to the converter 8, and the second sampling pulse is supplied to the AD converters 9 and 10, respectively. As a result, the AD converter 8 outputs the luminance signal at a sampling frequency of 9.
After sampling at MHz, luminance pixel data with, for example, 8 quantization pits obtained by quantization is extracted and supplied to the memory circuit 13. On the other hand, the color difference signals R-Y and B-Y are output from the AD converters 9 and 10 at a sampling frequency of 4.5M H
After being sampled separately in Z, two types of color difference pixel data having a quantization bit count of 8 bits, for example, obtained by quantization are extracted and supplied to the memory circuit 13, respectively.

The memory circuit 13 uses a write control signal generated by a memory write controller 14 based on a synchronization signal from a synchronization signal generator (SSG) 11 to write in each input pixel data one field at a time. To explain this write operation in more detail, for convenience of explanation, 1
The number of scanning lines in the field is 4, and the number of scanning lines per scanning line is 4.
Assuming that the number of pixels sampled at a sampling frequency of 9 MHz is 8, the number of luminance pixel data for one frame is 64 (
=8x4x2), and the number of color difference pixel data for one frame is 32 (=4x4x2>) for both R-Y and B-Y.Among these, luminance pixel data is shown with diagonal lines in FIG. 9(A). Only pixels are written into the memory circuit 13. The pixels shown with diagonal lines in FIG.
Field line #2. #4. #6. This is a total of one field worth of pixels including even-numbered pixels #8. Therefore, the luminance pixel data with a sampling frequency of 9 MHz is 1
Sampling frequency is 4.5M, which is thinned out every 3 seconds.
It is considered as HZ.

On the other hand, of the two types of color difference pixel data, only the pixels indicated by diagonal lines in FIG. 9(B) are stored in the memory circuit 13. Pixels shown with diagonal lines in FIG. 9(B) are line #1 of the first field. #3. Odd numbered pixels of #5 and #7,
Second field line #2. #4. #6. This is a total of one field worth of pixels including even-numbered pixels #8.

Therefore, both the first color difference pixel data and the second color difference pixel data have a sampling frequency of 4.5 MHz.
The sampling frequency is actually 2.25M, which is thinned out every 30 seconds.
It is assumed to be H7.

In this way, one field of luminance pixel data and two types of color difference pixel data each consisting of the first and second fields of pixel data are written into the memory circuit 13, respectively. Next, in the memory circuit 13, each written pixel data is read out by a read control signal generated by the memory read controller 15 based on the synchronization signal from the 5SG11. To explain this readout operation in more detail, first, during the first field WJ, the luminance pixel data Y1 of the first field at the shaded position in FIG. 10(A) is sampled at a sampling frequency of 4.
After being serially read out at 5 MHz, the two types of color difference pixel data (R-Y)+ and (B-) of the first field at the positions indicated by diagonal lines in FIG.
Y)+ are each read out serially with a sampling frequency of 4.5 MHz. Here, since the color difference pixel data is essentially written at a sampling frequency of 2.25 MHz, by reading it out at twice the speed, the color difference pixel data of the first field will be read out in 1/2 field. Become. Therefore, during each horizontal scanning period (+-1>, H/2 in the first half) of the one field period, the first field pixel data (R- Y)+ is read out, and in the second half H/2 period, the pixel data (B-Y) of the first field is read out of the second color difference pixel data related to the color difference signal B-Y.
+ is read out repeatedly.

In the third one-field period, the luminance pixel data Y of the second field at the shaded position in FIG.
2 is serially read out at a sampling frequency of 4.5 MHz, and in the fourth one-field period, the first and second color difference pixel data ( R-Y)2 and (B-Y)2 are read out serially alternately every H/2 period at a sampling frequency of 4.5 MHz.

In this way, the luminance pixel data and two types of color difference pixel data serially read out from the memory circuit 13 are
The signal is supplied to a converter 16, where it is digital-to-analog converted and then supplied to a video signal processing circuit 17. The video signal processing circuit 17 converts the analog video signal from the DA converter 16 into an analog video signal with a transmission band of substantially 4MH7 from the 5SGI 1.
After adding the J1 signal and the color burst signal, the signal is converted into a frequency modulated wave signal having a frequency spectrum as shown in FIG. output to a video disc cutting recording device.

In the frequency spectrum shown in FIG. 11, numeral indicates the carrier wave shift frequency band of 2.3 MHz of the above-mentioned frequency modulated wave signal, and fa corresponds to the sync tip (6.1 MHz)-I Z , fl) is a frequency of 6.6 MHz corresponding to the pedestal, and fc is a frequency of 7.9 MHz corresponding to the white beak.

Further, I[L, IILI indicate the lower sideband and upper sideband of the frequency modulated wave signal. Furthermore, fPl.

fp 2 and Tj fp 3 WA signal fp+, r
The frequency spectra of p2 and fP3 are shown.

Here, the frequency-modulated wave signal described above is recorded on the spiral or concentric tracks of the disk as shown in FIG.
119507Ji - proposed in Japanese Patent Application No. 59-119509, an analog recording track of an analog composite video signal related to an image indicating the content is placed at the beginning position of each digital recording track portion in which a plurality of still images are recorded. When applied to a recorded disc,
The frequency modulated wave signal will be recorded on this analog recording track.

During a high-speed search, this disc scans the digital recording tracks at high speed, and the analog recording tracks are played back at a low speed below that of normal playback. The content of the image is identified. Thereby, digital recording tracks can be searched in a short time. The above-mentioned digital recording track refers to a track such as a recording track of a digital audio disk, in which one block (frame) of signal in the signal format shown in FIG. 12 is recorded in 44,
A digital signal synthesized in time series at a transmission frequency of 056 kHz (or 44.100 kHz >), obtained by frequency modulating a carrier wave of about 7 MH2, for example, the 13th
A frequency modulated wave signal (second FM signal) having a frequency spectrum as shown in the figure is recorded.

Here, in one block of signals shown in FIG.
indicates the placement position of an 8-bit fixed pattern synchronization signal indicating the start of a block. ch-1, C11-2, Ch
-3 and Ch-4 each indicate the placement position of one word of a 16-bit digital signal. As this digital signal, the voice signal (audio signal) is pulse code modulated (PC
M) There are digital audio signals obtained by PCMI, and digital video signals obtained by PCMI.

Here, of the 4 channels of digital data, 2 channels are digital video signal data related to still images (including partial moving images), and the remaining 2 channels are the ones proposed by the applicant in Japanese Patent Application No. 13944/1983. Selected for control program signals, compressed audio data, etc.

The above control program signal is a signal that should be loaded into a device such as a personal computer with a judgment screen connected to a disc playback device, is modulated using a self-clockable modulation method, and is limited to the audio band. This is a signal. In addition, the compressed audio data mentioned above is digitally modulated with a low frequency audio signal of about several kHz, such as an announcement sound to explain a still image or a sound effect that gives an acoustic effect to a still image, to compress the band. This is digital data that has been compressed in one or two of bit-wise compression (for example, non-linear quantization) or time-axis compression. Also the first
P and Q shown in FIG. 2 are each 16-bit error correction codes.

Furthermore, CRC is a 23-bit error detection code, and ch-i to ch-4, P are arranged in the same block.

Q(7) For each word, for example, X23+X5 +X4 +X
This is the 23-bit remainder obtained when dividing by the generator polynomial +1.During reproduction, the signal from the 9th bit to the 127th bit of the same block is divided by the above generator polynomial, and the resulting remainder is When it is zero, it is used to detect that there is no error.
r indicates a 1-bit multiplexing position of various control signals (address signals) used for random access and the like. This control signal distributes each bit data and transmits one bit in one block. For example, all bits of the control signal are transmitted in 196 blocks (that is, the control signal is transmitted in 196 blocks).
Consists of bits. ).

Furthermore, U is two reserved bits called user's bits. One block of signals is composed of a total of 130 bits from S to U shown in FIG. They are synthesized at the same frequency and transmitted in chronological order.

The above 196-bit control signal has a configuration in which four types of address codes of 49 bits each are synthesized in chronological order.
These four types of address codes all have the same signal format.

A frequency modulated wave signal (first FM signal) having a frequency spectrum as shown by the solid line in FIG. 11 and a frequency modulated wave signal (second FM signal) having a frequency spectrum as shown by the solid line in FIG. 13. Only one of the FM signals is supplied to the recording device. The recording device is a known cutting device using a laser beam, and the above-mentioned first or second FM signal is supplied as a first input signal, and every four field periods equal to one rotation period of the disc-shaped recording master. A burst-like first reference signal fρ1 and a burst-like second reference signal fP2 are generated in relation to the switching positions of the alternately arranged reference signals and the switching positions of rp+ and rpz, respectively. A signal consisting of the third reference signal fP3 is supplied as the second input signal. The recording device records these two human input signals as the first. The laser beams are converted into second modulated laser beams and simultaneously focused on the photosensitive material on the disc-shaped recording master at a distance of about 1/2 track pitch from each other.

This recording master disk is subjected to a known development process, and from this, a disk 20 having an electrode function and a track pattern as shown in FIG. 14 in which no needle guide groove is formed is manufactured by a known one-disc process. .

In FIG. 14, a disk 20 has an information signal consisting of a video signal, an audio signal, and an address signal under a spiral track as frequency modulated wave signals (first FM signal, second FM signal). Bits are formed and recorded intermittently depending on the content. The track corresponding to each rotary valve of the disk 20 under one continuous spiral track shown by the solid line in FIG. 14 is tIt t2. t3.・
Shown as... Each track has information signal bits formed on a flat surface, and no needle guide groove is formed. −
For each horizontal scanning period (one day), bits of the first reference signal fPl are placed on both sides of the longitudinal direction of the analog recording track at positions corresponding to the recording horizontal blanking period for each horizontal scanning period (one day). The bits of the second reference signal fP2 are formed.

Only one of the bits of the reference signals fPI and fP2 is formed at an intermediate position between the center lines of adjacent tracks, and the reference signals fP, , rρ2 are recorded for the - track. The playing side changes with each track. That is, in FIG. 14, the track of the reference signal fρ1 is shown by a broken line, and the tracks 1 to 1 of the reference signal fP2 are shown by a dashed line.

Vl, V2. V3. ... indicates the position of the vertical synchronization signal of each field. Also, each track tl, t
2゜t3,...'s starting end position, that is, the reference signal fP I
and fP2 switch positions vl, v5. vg...
The third reference signal fρ3 is recorded for approximately 3H period, for example.

Further, one rotation period of the disk 20 is equal to, for example, four field periods of a video signal, and the vertical blanking period of an analog recording track is shown in FIG. 14a.

Tracks within the range shown in b, c and d °tI, t2L3
．． It is recorded in ja.

Furthermore, three types of address signals are recorded in time series in each of the four vertical blanking period recording portions a to d of the analog recording track of the disk 20.

Furthermore, the digital recording track t5 of the disk 20.
t6. t7. ... are also formed on the spiral track T, but after one block of signals in the signal format shown in FIG. 12 is synthesized in time series, the second F
It is recorded as an M signal, and vertical blanking period recorded portions a to d do not exist.

However, the digital recording track is, t6゜ty
, . . ., the above reference signal fP 3 is the reference signal rp 3 of the analog recording track (L+ to t4) and the disc 2
The reference signals fP+ and fP2 are recorded on both sides of the reference signal fP+ and fP2 at a period of 1H. That is, the reference signals fP1 to rP3 are always recorded on the disk 20 at a constant period, regardless of whether the analog recording track or the digital recording track is involved.

The present applicant previously proposed a disc in which analog recording tracks and digital recording tracks are recorded in a mixed manner, and a reproducing apparatus therefor in Japanese Patent Application Nos. 58-83232 to 1987-83235. The disc to be reproduced in the present invention has a color video signal related to a color still image representing the information content of a still image recorded on the digital recording track immediately after the analog recording track as shown in FIG. 10 (A). ) to (D>).

Next, a disc playback device according to the present invention will be explained.

In FIG. 1, a disk 20 on which the analog recording tracks and digital recording tracks described above are recorded is placed on a turntable 21, and an output signal from a servo circuit (not shown) is driven by a motor 22. They are rotated synchronously based on the The scanning needle 23 is moved in the radial direction of the disk 20 by the feed mechanism 25 together with the tracking coil 24 while sliding on the disk 20 . Since the disk 20 has an electrode function and the scanning needle 23 is formed with an electrode, an electrostatic capacitance is formed between the disk 20 and the electrode of the scanning needle 23, which causes the geometry of the recording track to change. It changes in response to the change in the physical shape, and this change is converted into an electrical signal by the pickup circuit 26 in a known manner.

The reproduction signal (RF
The multiplied signal is supplied to a known tracking servo circuit 27, where the reference signal fρI described above is supplied.

After fP2 is discriminated and separated, envelope detection is performed, and the detection outputs are differentially amplified and converted into tracking error signals. This tracking error signal is applied to the tracking coil 24, and the scanning needle 23 is applied so that the scanning needle 23 always scans on the information signal recording track without track deviation.
The tip of the needle is momentarily and minutely displaced in the track width direction.

Furthermore, the reproduced signal taken out from the pickup circuit 26 is supplied to a video signal processing circuit 28, where it is FM demodulated, and is outputted via an output terminal 29 to a known digital audio disc reproduction circuit section (not shown). is output to
Here, the digital signal reproduced from the digital recording track is demodulated and reproduced. On the other hand, the first FM signal reproduced from the analog recording track by the video signal processing circuit 28 is FM demodulated and then supplied to the AD converter 30, where it is analog-to-digital converted and converted into the 10th FM signal.
Pixel data as shown in Figures (A) to (D) is obtained. This pixel data relates to signals in a video period excluding the composite synchronization signal and color burst signal in the composite video signal. Also,
The demodulated composite video signal taken out from the video signal processing circuit 28 is separated and extracted into a horizontal synchronization signal and a vertical synchronization signal by a synchronization separation circuit 31, and then supplied to a sampling pulse generator 32. This sampling pulse generator 3
The tracking servo circuit 27 also supplies the third reference signal fP 3 of one rotation period of the disk 20 to the tracking servo circuit 27 .

The AD converter 30 performs analog-to-digital conversion based on the sampling pulse from the sampling pulse generator 32, converts it into the above-mentioned pixel data, and supplies it to the memory circuit 3. The memory circuit 33 is a synchronization signal generator (SS
G) A write/read control pulse and a latch pulse generated by the memory read/write controller 35 based on the output signal of the disk 20 are supplied, respectively, and luminance pixel data and two types of color difference are reproduced per rotation of the disk 20. Each pixel data is loaded into a dedicated field memory.

FIG. 2 shows a block diagram of one embodiment of the memory circuit 33. In the same figure, the above pixel data serially taken out from the AD converter 30 is supplied to latch drivers 511 to 518, respectively, via the input terminal 50, and is then supplied to the latch drivers 511 to 518, respectively, from the memory read/write controller 35 to the terminals 521 or 52.
It is latched by a 4.5 MHZ latch pulse coming through 2. Since the input latch pulse of the terminal 521 and the input latch pulse of the terminal 522 have a phase difference of 180 degrees, the first input pixel data is sent to the latch driver 511.
．． 512.51s, 51y, and the next input pixel data is sent to the latch drivers 513, 51J, 516.
51s, and thereafter, each time pixel data comes in, the first latch driver 511, 512, 515 and 517
latch group and latch driver 513.5”+4.51
s and the second group of latches 518 alternately.

The pixel data latched by the latch drivers 511-518 are individually transferred to the memory element groups 531-538, respectively, until the next latch pulse arrives. Here, the memory element groups 531 to 538 include the controller 3.
5, a write pulse or read pulse of <2.25 MH2 is applied as shown in R/W, but the write pulse is applied during one field reproduction period of the luminance pixel data Y+ of the first field indicated by Fl in FIG. The voltage is applied only to the memory element groups 531 and 533, and each line is During the first half of each line, the voltage is applied only to the memory element group 535, and during the second half of each line, it is applied only to the memory element group 537. Further, during one field reproduction period of the i-plane pixel data Y2 of the second field indicated by F3 in FIG.
Furthermore, a write pulse is applied to the memory element group 536 during the first half of each line during the one-field reproduction period indicated by F4, and to the memory element group 538 during the latter half of each line.

Therefore, the luminance pixel data Y1 of the first field is alternately written to the memory element groups 53+ and 533, and the luminance pixel data Y2 of the second field is alternately written to the memory element groups 532 and 534, respectively. Further, the first color difference pixel data (RY)+ of the first field is stored in the memory element group 5.
35, and the first color difference pixel data (RY) 2 of the second field is written to the memory element group 536.

Furthermore, the second color difference pixel data (B-Y) of the first field
+ is written to the memory element group 537 and the second color difference pixel data of the second field (B Y>2 is written to the memory element group 5
38.

Each of the memory element groups 531 to 538 has x/4 bits, where the number of quantized bits to be reproduced (read) is X (X is 8, for example) out of the 8 bits of quantized bits of pixel data. Consists of 64k RAM (Random Access Memory).

That is, a total of one field worth of luminance pixel data is written to the memory element groups 531 to 534, and the memory element group 53
5 and 536. The storage capacity is sufficient to write a total of one field's worth of first and second color difference pixel data in 537 and 538, respectively.

As described above, the pixel data of the first field is written into the memory element groups 53+, 533.53s, and 537. , memory element groups 532, 534, 53g and 53 into which the second field pixel data is written.
The address of 8 is specified by a memory address signal coming from the controller 35 via the terminal 542.

This memory address signal has, for example, 16 bits, which are divided into upper 8 bits and lower 8 bits and transmitted in a time-division manner. The upper 8 bits of the memory address signal indicate a numerical value corresponding to, for example, a line of one field and 1=1, and the lower 8 bits indicate a numerical value corresponding to a pixel position (sampling point) in that one line.

When all the pixel data reproduced during one rotation period of the disk 20 has been stored in the memory element groups 531 to 538,
Next, memory element groups 531 to 538 are accessed simultaneously, and a total of eight pixel data read from designated addresses are simultaneously latched by latch drivers 55+ to 558 based on latch pulses from terminals 56. This latch pulse is a 2.25 MH2 pulse generated by the controller 35, and the drive pulse generated by the controller 35 within the period is the terminal 57.
+, 572, 573, and 574 in a time-division manner, and within one period of the latch pulse, drive pulses are sequentially applied to terminals 58, 59, and 1. : Arrives one time at a time in a time-sharing manner.

As a result, the luminance pixel data temporarily stored in each of the latch drivers 551 to 554 is read out in a time-division manner at 9 MHz, and is supplied to the DA converter 39 shown in FIG. 1 via the output terminal 36. On the other hand, at the same time, the first color difference pixel data temporarily stored in the latch drivers 555 and 556, respectively, and the second color difference pixel data temporarily stored in the latch drivers 557 and 558, respectively, are time-divisionally stored. The signal is read out at 4.5 MHz and supplied to the DA converter 40.41 shown in FIG. 1 via the output terminal 37.

Here, as described above, the memory element groups 531 to 538 store three types of pixel data for a total of one field, each half of the pixel data of the first field and the pixel data of the second field. However, if two fields are read out in the same order in succession, the deterioration in vertical resolution will be small, so as previously proposed by the applicant in Japanese Patent Laid-Open No. 59-63014, etc., the memory read/write controller 35 By devising the output order of read addresses generated by
The pixel data that should originally be displayed at the diagonally shaded positions in ) and the positions indicated by black circles in Figure 3 are read out in a so-called staggered manner in the order shown by solid lines in Figure 3, and the second field reproduction period is started. The pixel data that should originally be displayed at the positions indicated by black circles in FIG. 3 are read out in a so-called staggered manner in the order indicated by broken lines in the same figure.

As a result, the untransmitted pixel data shown in FIGS. 9 <A> and (B) and the blank areas in FIG. As shown in Figure 5, the pixel data is displayed as pixel data (one line above (that is, one line of a different field) or one line below), so the playback screen is displayed as a black circle as shown in Figure 5. As shown by diagonal lines, the original transmitted pixel data is also displayed in the pixels one row below (or one row above). That is, as can be seen from FIG. 5, in both the reproduction period of the first field and the second field, the pixel data of the first field and the pixel data of the second field are alternately displayed on each line. Since the field images are displayed in an array, and the combination of the array pixel data is displayed differently in both field reproduction periods, the apparent decrease in vertical resolution of the field image is reduced. In addition, since the correlation between pixels between adjacent lines is usually strong, aliasing distortion is dispersed toward higher frequencies,
Noise appearing in reproduced images due to aliasing distortion can be reduced to a visually unpleasant degree.

Moreover, the two types of color difference pixel data supplied to the DA converters 40 and 41 are both read out at a sampling frequency of 4.5M (Z), which is substantially twice the sampling frequency, so the transmission band is lower than that of the conventional one. Broadband.

Returning to FIG. 1 again, the DA converter 39.40
The reproduced luminance signal and the two types of reproduced color difference signals R-Y and B-Y, which are respectively digital-to-analog converted and extracted by the encoder 41, are simultaneously supplied to the encoder 42, where the composite synchronization signal and color burst signal from the 5SG34 are Added signal and specified television system *+i
After being converted into a composite color video signal, the signal is outputted to a monitor display device (not shown) via an output terminal 43.

In this way, the disc 2 is recorded with a mixture of digital recording tracks and analog recording tracks.
0 means that during a high-speed search, the digital recording track section is transferred at high speed, and the analog recording track section is transferred at, for example, the normal playback speed, and the previously recorded playback signal is played back as described above. As a result, a high-quality color still image showing the information content of the digital recording track immediately after that is displayed on the monitor display device. Therefore, by viewing these color still images one after another, the user can search for a desired digital recording track in a short time.

It goes without saying that one field of pixel data that has not been originally transmitted may be reproduced and displayed using data obtained by appropriately weighting a plurality of pixel data located around it on the screen and then adding and combining the data. It is.

Effects of the Invention As described above, according to the present invention, it is possible to reproduce a disk on which a total of one field's worth of luminance pixel data and two types of color difference pixel data, including pixel data of the first and second fields, are serially recorded. Therefore, the beats and distortions between the luminance signal and the two types of color difference signals that occur on conventional video discs that record band-sharing multiplexed color video signals do not occur at all. In addition, it reproduces a color video signal whose transmission band is expanded by the recording frequency of the audio signal, and two types of pixel data can be read out at a high sampling frequency, resulting in high quality and good S/N. Furthermore, since the color burst signal is added on the playback device side, it is possible to prevent color reproduction from deteriorating due to phase shift of the color burst signal during playback. When playing a disk on which the time-series composite signal of the three types of pixel data is recorded on the analog recording track of a mixed disk of digital recording tracks and analog recording tracks proposed earlier, the It has features such as being able to reproduce color still images in high quality from the analog recording track.

[Brief explanation of drawings]

Figure 1 shows a program showing an embodiment of the playback device of the present invention.
・Ivy system diagram, Figure 2 is a block system diagram showing an example of the memory circuit in the block system shown in Figure 1, and Figure 3 is the original screen of pixel data stored in the memory circuit shown in Figure 2. Figure 4 shows the position and reading order within
Figures 5 and 5 are diagrams for explaining how non-transmitted pixel data is displayed in place of transmitted pixel data at the top and bottom of the screen in the reproducing device, respectively, and Fig. 6 shows the information signal recording disc to be reproduced by the device of the present invention. A diagram schematically showing an example of recorded information content,
7 is a diagram showing an example of a reproduced image when the recorded video signal of one field period of the disk shown in FIG. 1 is reproduced as it is; FIG. 8 is a block diagram showing an example of the recording system of the disk;
FIG. 9 is a diagram explaining pixel data stored in the memory circuit in the block system shown in FIG. 8, and FIG. 10 is a diagram explaining pixel data stored in the memory circuit in the block system shown in FIG. FIG. 11 is a diagram showing an example of the frequency spectrum of a frequency-modified harmonic signal frequency-modulated with the above pixel data, and FIG. 12 is a diagram showing seven blocks of digital signals to be recorded on a digital recording track. A diagram showing an example of the format, FIG. 13 is a diagram showing an example of the frequency spectrum of a frequency-modulated wave signal to be recorded on a digital recording track frequency-modulated with the digital signal, and FIG. 14 is a diagram showing information to be reproduced. It is a figure which shows an example of the track pattern of a signal recording disk. 1.20... Information signal recording disk (disc), 4...
・Matrix circuit, 8 to 10... AD converter, 11°34... Synchronous signal generator (SSG), 12.32...
- Sampling pulse generator, 13.33... Memory circuit, 14... Memory write controller, 15...
・Memory read controller, 16.39-41...
DA converter, 18... recording signal output terminal, 23...
Scanning needle, 24...Tracking coil, 26...Pickup circuit, 27...Tracking servo circuit,
2... Reproduction signal output terminal, 30... AD converter,
35...Memory read/write controller, 42.
...Encoder, 52+, 522.56...Latch pulse input terminal, 531-538...Memory element group,
54+, 542...Memory address signal input terminal.

Claims (3)

[Claims] (1) A total of 1 field including the pixel data of the first and second fields extracted from the pixel data obtained by sampling and quantizing the luminance signal of one frame related to a still image at the first sampling frequency. luminance pixel data for 10 minutes and two types of color difference signals for 1 frame regarding the still image are each sampled separately at a second sampling frequency that is 1/2 times the first sampling frequency, and The luminance pixel data of the first field, among the first and second chrominance pixel data for a total of one field each including pixel data of the first and second fields respectively extracted from the pixel data obtained by
The luminance pixel data of the second field, the first and second chrominance pixel data of the first field, and the first and second chrominance pixel data of the second field are switched every field, and the cycle is 4 fields. a reproducing means for picking up and reproducing the recorded signals of the information signal recording disk sequentially recorded in a spiral or concentric circular track in time series with a reproducing element; and pixel data demodulation means for obtaining second color difference pixel data, respectively; a memory circuit to which each pixel data from the pixel data demodulation means is serially supplied; After one field's worth of pixel data is written, the thinned out pixel data is supplemented with peripheral transmission pixel data, so that the luminance pixel data is at the first sampling frequency and at the first and second sampling frequency. 2 color difference pixel data are read out in parallel at the second sampling frequency, and a reproduced color video signal compliant with a desired television system is generated from each pixel data read out from the memory circuit. An information signal recording disk reproducing device comprising: an outputting means; and an information signal recording disk reproducing device. (2) The luminance pixel data and the first and second color difference pixel data are each subjected to digital-to-analog conversion, and then converted into a frequency modulated wave signal and recorded on the spiral or concentric track. The pixel data demodulating means performs frequency demodulation on the frequency modulated wave signal in the reproduced signal, and
An information signal recording disk reproducing apparatus according to claim 1, characterized in that the information signal recording disk reproducing apparatus is configured to perform conversion. (3) The information signal recording disk stores a digital signal in which multiple channels of digital data obtained by digitally modulating information signals mainly composed of a plurality of first still images are synthesized in block units in a time-series manner. Furthermore, a digital recording track in which the first modulated wave signal obtained by modulation is recorded, and a digital recording track formed immediately before the recording track portion of each of the plurality of first still images of the digital recording track; an analog recording in which a second modulated wave signal obtained by analog modulation with a composite video signal regarding a second still image indicating the content of the first still image of the digital recording track to be recorded immediately after is recorded; tracks are respectively formed, and the frequency modulated wave signal is recorded as the second modulated wave signal, and the pixel data demodulation means is configured to convert the analog recording track into a normal one of the digital recording track. Claim 2 is characterized in that the reproduced frequency modulated wave signal is subjected to frequency demodulation and then AD converted when scanning is performed at a transfer speed that is the same as or slower than that during reproduction. Information signal recording disk reproducing device.