JPS61107894A - Information signal recording disk - 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 recording them in the sequence of surfaces. CONSTITUTION:At one track for one rotation of an information signal recording disk 1, respective picture element data concerning one static picture are recorded, and after luminance picture element data Y1 and Y2 out of the data sample a luminance signal for one frame, they consist of one remaining field which thins out one field out of picture element data obtained by quantizing. Transmission is executed at the same frequency as the sampling frequency after thinning-out, two kinds of color difference picture element data (R-Y)1, (R-Y)2, (B-Y)1 and (B-Y)2 respectively consist of one remaining field obtained by quantizing after color difference signals R-Y and B-Y for one frame are separately sampled, and transmitted at the frequency two times as much as the sampling frequency after thinning-out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information signal recording disk, and more particularly to an information signal recording disk 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. Composite video signals, etc. are recorded. Note that on a video disc, for example, an address signal for random access is recorded during a specific period within the vertical blanking period of a composite video signal, and the address signal is a coded digital signal. Since the main body of information is an analog-modulated composite video signal, etc., a track such as the recording track of this video disc will hereinafter be referred to as an analog recording track for convenience in this specification.

In such a video disk, a composite color video signal of the same field or frame is recorded on one track for one revolution, and by repeatedly playing back that track, color images with no jitter are produced. Discs from which still images can be obtained are known (for example, Japanese Patent Application No. 56-48925, etc.).

Problems to be Solved by the Invention However, on the above-mentioned video disk, a frequency-modulated analog composite color video signal in which a luminance signal and a carrier color signal are band-sharing multiplexed is recorded. The band is narrow, and distortion and beat interference occur due to band sharing multiplexing.Furthermore, in the NTSC and PAL systems, the hue is expressed by the phase of the reproduced carrier color signal relative to the phase of the color burst signal, so the reproduced color burst signal When a phase shift occurs, there is a problem in that color reproducibility deteriorates.

Therefore, the present invention has proposed the above method by thinning out one frame's worth of pixel data obtained by separately sampling and quantizing a luminance signal and two types of color difference signals into one field, and recording them in a frame-sequential manner. The purpose of the present invention is to provide an information signal recording disk that solves the above problems.

Means for Solving the Problems The information recording disk according to the present invention samples and quantizes a luminance signal for one frame and two types of color difference signals regarding a still image separately at first and second sampling frequencies. , From the pixel data obtained thereby, a total of one field worth of luminance pixel data including pixel data of the first and second fields, respectively, and a total of one field including pixel data of the first and second fields, respectively.
Of the first and second chrominance pixel data for the fields, 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 luminance pixel data of the first field. The first and second color difference pixel data of two fields are switched every field and are recorded in a time-series manner on a spiral or concentric track at a cycle of four fields.

Effect The above two types of color difference signals have a sampling frequency of 1/1 of the luminance signal sampling frequency.
Since the second sampling frequency is twice as high as the frequency, and the audio signal is not recorded, the two types of color difference signals are transmitted over a wide band. Also, the luminance pixel data of the first field, the luminance pixel data of the second field, the first and second color difference pixel data of the first field, and the first pixel data of the second field.
and the second color difference pixel data are switched and recorded every field period, so the luminance signal and the two types of color difference signals are not simultaneously band-sharing multiplexed and recorded.

An embodiment of the present invention will be described below with reference to the drawings.

Embodiment FIG. 1 schematically shows an embodiment of the recorded information content of the information signal recording disk according to the present invention. In the same figure, inside the information signal record!
8 (hereinafter referred to as disk) 1 has 4 field periods, and the first 1 field period 1i! In IF1, the luminance pixel data Y+ of the first field out of the pixel data for one field, which will be described later, is recorded in chronological order.
In the next one field period F2, the first one of the color difference pixel data related to the color difference signal R-Y for one field, which will be described later.
field chrominance pixel data (R-Y) + and the first field chrominance pixel data (B-Y
)+ and are alternately synthesized and recorded in chronological order every 1/2 horizontal scanning period.

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 luminance pixel data Y+, Y
2.

Two types of color difference pixel data (RY)+.

(RY)z, (B-Y)+, and (B-Y)2 are digital data obtained by sampling and quantizing the luminance signal and two types of color difference signals, respectively, regarding the same still image. is frequency modulated after digital-to-analog conversion,
It is 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. Of these, the luminance pixel data Y+ and Y2 are obtained by quantizing the luminance signal of one frame after sampling. Consists of the remaining 1 field after thinning out 1 field of the obtained pixel data, and has 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)z.

(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 is transmitted at a frequency (for example, 4.5 MHz) that is twice the sampling frequency after thinning. Therefore, if the still image is, for example, an image like a keyhole for convenience of illustration, then if the previously recorded signal is reproduced as it is during reproduction of each one field period indicated by Fl and F3 in FIG. 1, then the image shown in FIG. A reproduced image of the 'Is degree signal as shown in FIG. , color difference signal (RY),
Each reproduced image (8-Y) is obtained as if it were divided 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. Second field luminance pixel data Y2. Two types of color difference pixel data (R-
Y)+ and (8-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 of the present invention will be explained.

FIG. 3 shows a block system diagram of an example of a recording system for recording and forming a disc of the present invention. In the figure, three primary color signals of red (R), green (G), and blue (B) obtained by imaging a subject (still image) with a television camera 3 are supplied to a matrix circuit 4, where a luminance signal Y is generated.

They are converted into two types of color difference signals RY and BTY, respectively. The luminance signal Y is passed through a low-pass filter 5 with a cutoff frequency of 8MH7.
The signal is supplied to the AD converter 8 through.

On the other hand, the color difference signals R-Y and B-Y have a cutoff frequency of 4
The signals are separately supplied to AD converters 9 and 10 through MHz low-pass filters 6 and 7, respectively.

On the other hand, based on the synchronization signal from the synchronization signal generator (SSG) 11, the sampling pulse generator 12 generates a first sampling pulse with a repetition frequency of 9 MH2 and a second sampling pulse with a repetition frequency of 4.5 MHZ. generated and the first sampling pulse is sent to the AD converter 8.
and the second sampling pulse to AD
Converters 9 and 10 are supplied respectively. As a result, the AD converter 8 samples the luminance signal at a sampling frequency of 9 MHz, and then quantizes the luminance pixel data, which has a quantization bit count of 8 bits, for example, and supplies it to the memory circuit 13 . On the other hand, from the AD converters 9 and 10, the color difference signal R-Y
and B-Y are sampled separately at a sampling frequency of 465 MH2, and then quantized.
Separate color difference pixel data are extracted and supplied to the memory circuits 13, respectively.

The memory circuit 13 writes each input pixel data one field at a time in response to a write control signal generated by the memory write controller 14 based on a synchronization signal from a synchronization signal generator (SSG>11). To explain in 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> pieces, and the number of color difference pixel data for one frame is 32 (=4x4x2) for both RY and BY. Among these, only the pixels indicated by diagonal lines in FIG. 4(A) are written into the memory circuit 13 as luminance pixel data. The shaded pixels in Figure 4 (A>
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 sampling frequency 9MH7 is 1
Sampling frequency is 4.5M, which is thinned out every 3 seconds.
It is assumed to be Hz.

On the other hand, for the two types of color difference pixel data, only the pixels indicated by diagonal lines in FIG. 4(B) are written into the memory circuit 13. Pixels shown with diagonal lines in FIG. 4(B) are line #1 of the first field. #3. #5° Odd numbered pixels of #7 and line #2 of the second field. #4. #6. This is a total of one field worth of pixels including even-numbered pixels #8. Therefore, for both the first color difference pixel data and the second color difference pixel data, data having a sampling frequency of 4.5 MHz is thinned out every other pixel, so that the sampling frequency is substantially 2.25 MHz.
It is considered to be MH7.

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, the memory circuit 13 reads each written pixel data using a read control signal generated by the memory read controller 15 based on the synchronization signal from the 5SGI 1. To explain this readout operation in more detail, first, in the first field period, the luminance pixel data Y+ of the first field at the shaded position in FIG. After being output, the two types of color difference pixel data (R-Y)+ and (B-Y)+ of the first field at the positions indicated by diagonal lines in FIG. 5(B) are sampled in the next one field period. It is read out serially at a frequency of 4.5MH7.Here, the color difference pixel data is substantially sampled at a sampling frequency of 2.25M.
Since it is written at H7, the color difference pixel data of the first field is read out at twice the speed, and the color difference pixel data of the first field is 1/1
It will be read in two fields.

Therefore, each horizontal scanning period (H) of the above one field period
In the first half H/2 period, the first field pixel data (R-Y)+ of the first color difference pixel data related to the color difference signal R-Y is read out, and in the second half H/2 period, the color difference signal B Of the second color difference pixel data regarding -Y, the pixel data (B-Y)+ of the first field is read out repeatedly.

In the third one-field period, the luminance pixel data Y2 of the second field at the shaded position in FIG.
is read out serially at a sampling frequency of 4.5 MHz, and in the fourth one-field period, the first and second color difference pixel data (R7Y )2, (8-Y)2 is the sampling frequency 4
．． 5MH2 is read out serially alternately every H/2 period.

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 adds a synchronization signal and a color burst signal from the 5SG 11 to the analog video signal from the DA converter 16 with a transmission band of substantially 4 MHz, and then adds the synchronization signal and color burst signal from the 5SG 11 to the analog video signal from the DA converter 16, which has the same frequency spectrum as the video signal recording frequency spectrum of the existing video disc. 6
After converting into a frequency modulated wave signal having a frequency spectrum as shown in the figure, it is outputted to a known video disc cutting and recording device via an output terminal 18.

In the frequency spectrum shown in FIG. 6, numeral indicates the carrier wave shift frequency band of 2.3 MHz of the above-mentioned frequency modulated wave signal, and ra indicates the frequency of 6.1 MHz corresponding to the sync tip, [ b corresponds to pedestal 6
, 6 MHz, and fc indicates a frequency of 7 and 9 MHz corresponding to the white beak.

Further, IIL and IILJ indicate the lower sideband and upper sideband of the frequency modulated wave signal. Furthermore, fPl.

rpz and rp3 are reference signals fp+, rp2 and fP
The frequency spectrum of 3 is shown.

Here, the above-mentioned frequency modulated wave signal is recorded on the spiral or concentric tracks of the disk as shown in FIG.
119507 to 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. If this is applied to a recorded disk, 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 slower speed than normal playback, so that the image obtained from the analog recording track is used to scan the digital recording track immediately after that. 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 having the signal format as shown in FIG.
It is a digital signal synthesized in time series at a transmission frequency of 6 kHz (or 44.100 kHz, ), and is obtained by frequency modulating a carrier wave of about 7 MHz, for example.
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. 7, S indicates the arrangement position of an 8-bit fixed pattern synchronization signal indicating the start of the block. Ch-1゜Ch-2,0h-3
and Ch-4 each indicate the placement position of one word of a 16-bit digital signal.This digital signal can be a digital audio signal obtained by pulse code modulation (PCM) of an audio signal, or a video signal obtained by PCM.
There is a digital video signal obtained from a commercial.

Here, of the four channels of digital data, two channels are digital video signal data regarding still images and partial moving images, and the remaining two channels are the control proposed by the applicant in Japanese Patent Application No. 13944/1983 Selected for 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 judgment capability connected to the disc playback device, and is modulated using a modulation method that allows Relf clocking, and is limited to the audio band. It's a signal. In addition, the above compressed audio data 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 the bit direction (for example, non-linear □ Chishu, etc.) or in one or both of the two compressions in the time axis. Further, P and Q shown in FIG. 7 are error correction codes each having 16 pits.

Furthermore, CRC is a 23-bit error detection code, and Ch-1 to Ch-4, P are arranged in the same block.

For example, each word of Q is X23+X5 +X4 +X+1
This is the 23-bit remainder obtained when dividing by the generator polynomial, and the 9th to 1st bits of the same block during playback.
The signal up to the 27th bit is divided by the above-mentioned generator polynomial, and when the resulting remainder is zero, it is used to detect that there is no error.

Furthermore, 1 in Figure 7. A and dr are one of various control signals (address signals) used for random access etc.
Shows multiple positions of pits. This control signal distributes each bit data and transmits one bit in one block. For example, all bits of the control signal are transmitted by 196 blocks (that is, the control signal is composed of 196 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.
4.100 kHz) and transmitted in time series.

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. 6 and a frequency modulated wave signal (second FM signal) having a frequency spectrum as shown by the solid line in FIG. 8. Only one of the FM signals is supplied to the recording device. The recording device is a known cutting device that uses laser light, and the recording device is a known cutting device that uses laser light.
The M signal is supplied as a first input signal, and a burst-like first reference signal rp I and a burst-like second reference signal fρ2 are input every four field periods, which is equal to one rotation period of the disc-shaped recording master. A signal consisting of reference signals alternately switched and arranged in an interleaved manner, and a third reference signal fP3 generated in relation to the switching position of fpI[P2 is supplied as a second input signal. Ru. 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 is subjected to a known developing process, and then a known iron making process is used to produce a disk 20 having an electrode function and a track pattern as shown in FIG. 9 without needle guide grooves. .

In FIG. 9, a disk 20 has a spiral track T in which information signals consisting of a video signal, an audio signal, and an address signal are converted into frequency modulated wave signals (first FM signal, second FM signal), and the information Bits are formed and recorded intermittently depending on the content. Of one continuous spiral track T shown by a solid line in FIG. 9, the tracks corresponding to each rotary valve of the disk 20 are designated as tl, tz, tz, . . .
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 rpl are placed on both longitudinally upper sides of the analog recording track at positions corresponding to the recording horizontal blanking period. , forming the bits of the second reference signal fP2.

Only one of the bits of the reference signals fP+ and fPz is formed at the intermediate position between the center lines of adjacent tracks, and the reference signals fp+ and fpz are recorded for the - track. The sides change with each track. That is, in FIG. 9, the track of the reference signal fρ1 is shown by a broken line, and the track of the reference signal fρ2 is shown by a dashed line. V+.

v2 * ■3 r... indicates the position of the vertical synchronization signal of each field. Also, each track tl, tz
, tz.

..., that is, the reference signals fP'l and fP2
At the positions V+, Vs, Vg, etc., where the
The reference signal rρ3 is recorded for about 3H period, for example.

Further, one rotation period of the disk 20 is equal to, for example, four field periods of the video signal, and the vertical blanking period of the analog recording track is shown in FIGS. 9a and 9b.

Tracks within the range shown in C and d tl, t2°t3.
It is recorded at t4.

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 ts of the disk 20,
t6. ty, . . . are also formed on the spiral track T, but after one block of signals in the signal format shown in FIG.
It is recorded as a signal, and vertical blanking period recorded portions a to d do not exist.

However, the digital recording track is, t6° (7, ・
..., the above reference signal fp3 is recorded in alignment with the reference signal fP3 of the analog recording track (j+~i<) in the radial direction of the disk 20, and the reference signals rp+, rp2 are recorded on both sides thereof. is similarly recorded at a 1H period. That is, the reference signals fpI to fP3 are always recorded on the disk 20 at a constant period, regardless of whether the analog recording track or the digital recording track is the same.

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. 5 (A). ) to (D).

Next, a disc reproducing apparatus for reproducing a disc according to the present invention will be explained. FIG. 10 shows a block diagram of an example of a disc playback device. In the figure, a disk 20 on which the analog recording tracks and digital recording tracks described above are mixed and recorded is on a turntable 21.
It is placed on top and is synchronously rotated by a motor 22 based on an output signal from a servo circuit (not shown).

The scanning needle 23 is moved along with the tracking coil 24 in the radial direction of the disk 20 by a feed mechanism 25 while sliding on the disk 20 .

The disk 20 has an electrode function and also has a scanning needle 23.
Since electrodes are formed on the disk 20 and the electrodes of the scanning stylus 23, an electrostatic capacitance is formed between the disk 20 and the electrode of the scanning needle 23, and this changes in response to changes in the geometrical shape of the recording track. The pickup circuit 26 converts the signal into an electrical signal in a known manner.

The reproduction signal (RF
The multiplied signal is supplied to a known tracking servo circuit 27, which receives the reference signal rp,+ as described above.

- After rρ2 is discriminated and separated, envelope detection is performed, and the detection outputs are differentially amplified and converted into a tracking error signal. 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.

The playback signal taken out from the pickup circuit 26 is supplied to a video signal processing circuit 28, where it is FM demodulated, and is output to a known digital audio disc playback circuit (not shown) via an output terminal 29. Here, the digital signal reproduced from the digital recording track is demodulated and reproduced. On the other hand, the video signal processing circuit 2
The first FM signal reproduced from the analog recording track by 8 is FM demodulated and then supplied to the AD converter 30, where it is analog-to-digital converted to the signal shown in FIG.
Pixel data as shown in A) to (D) are 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. Further, 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 a sampling pulse generator 3
2. The sampling pulse generator 32 is also supplied with the third reference signal rρ3 of one rotation period of the disk 20 from 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 33. The memory circuit 33 includes a synchronization signal generator (S
A write/read control pulse and a latch pulse generated by the memory read/write controller 35 based on the output signal of the SG) 34 are supplied, respectively, and the luminance pixel data and two types of color difference reproduced per one revolution of the disk 20 are supplied. Each pixel data is written to a dedicated field memory. That is, the memory circuit 33 consists of three field memories and a plurality of latch drivers, and it stores the luminance pixel data indicated by Y+ and Y2 in FIG. 1, that is, the pixels at the shaded positions in FIG. Data is written to the first field memory. Also shown in FIG.
.

The first color difference pixel data indicated by (RY)2, that is, the color difference pixel data at the shaded position in FIG. 4(B) is the second color difference pixel data.
is written to the field memory of
The second color difference pixel data indicated by Y)+ and (B-Y)2, that is, the color difference pixel data at the shaded position in FIG. 4(B), is written into the third field memory.

Next, the memory circuit 33 serially reads the luminance pixel data to the terminal 36 at 9MH7 according to the readout control signal from the memory read/write controller 35.
2nd color difference pixel data to terminal 37.38 4.5M H
Read serially with Z.

Here, the accumulated pixel data is for a total of one field, consisting of half of each pixel data of the first field and half of the second field, and if this is read out in the same order for two consecutive fields, the vertical resolution will deteriorate significantly. , as previously proposed by the present applicant in Japanese Patent Application Laid-Open No. 59-63014 and others,
During the first field reproduction period, the pixel data that should originally be displayed is shown in solid lines in Fig. 11 at the diagonally shaded positions in Fig. 4 (A> and (B) (positions indicated by black circles in Fig. 11)). During the second field reproduction period, the pixel data that should originally be displayed at the positions indicated by the black circles in FIG. DA corresponding to the read pixel data
Converter 39.40°41 is supplied.

As a result, according to the playback device proposed above, the fourth
Figures (A> and (B)) Moreover, the pixel data that is not transmitted, shown in the blank area in Figure 12, is the pixel data that is transmitted, shown in the shaded area in both figures, as shown in Figure 12. Pixel data on one line (i.e. - on one line of a different field).

゛ Or, since it is displayed as pixel data one line below, the playback screen is displayed as shown in Fig. 13, where the transmitted original pixel data indicated by a black circle is displayed as being one line below (or one line below) as shown by diagonal lines. The screen is also displayed in the pixels on the top row). That is, according to the playback device proposed above, the 13th
As can be seen from the figure, 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 arranged and displayed on each line, In addition, since the combination of array pixel data is displayed differently in both field reproduction periods, the apparent decrease in vertical resolution of the field image is reduced. Furthermore, since the correlation between pixels between adjacent lines is usually strong, aliasing distortion is dispersed toward higher frequencies, and the noise that appears in the reproduced image due to aliasing distortion can be reduced to some extent.

Moreover, since 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 4.5 MHz, which is substantially twice as high, the transmission band becomes wider than before. .

DA converters 39, 40 and 41 respectively provide digital
The analog-converted reproduced luminance signal and the two reproduced color difference signals R-Y and B-Y are respectively supplied simultaneously to the encoder 42, where they are added with a composite synchronization signal and a color burst signal from the 5SG34, and , the signal is converted into a composite color video signal based on a predetermined television system and output to a monitor display device (not shown) via the 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 the speed of normal playback, for example, and by reproducing the already recorded playback signal, A high quality color still image showing the information content of the digital recording track will be 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 for one field of pixel data that has not been originally transmitted, data obtained by appropriately weighting a plurality of pixel data located around the pixel data on the screen and then adding and combining them may be used.

Effects of the Invention As described above, according to the present invention, 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 recorded serially. There is no beat or distortion between the luminance signal and two types of color difference signals, which sometimes occurs on conventional video discs in which band-sharing multiplexed color video signals are recorded, and S/ N can be significantly improved, and the sampling frequency of two types of color difference pixel data is high.
In addition, since no audio signals are recorded, the transmission band of color difference signals can be made wider than that of conventional video discs, and the reproduced color still images can be of high quality. This makes it possible to prevent deterioration of color reproduction due to phase shift of the color burst signal during playback, and also to prevent the mixed digital recording track and analog recording track proposed by the applicant earlier.
- When recording is made on the analog recording track of the screen, it has the advantage that a color still image for high-speed digital recording track search can be recorded in high quality on the analog recording track.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing an example of the recorded information content of the disk of the present invention, and FIG. 2 is a diagram showing a reproduced image when the recorded video signal of one field period of the disk shown in FIG. 1 is reproduced as is. 3 is a block system diagram showing an example of the recording system of the disk of the present invention; FIG. 4 is a diagram illustrating pixel data stored in the memory circuit in the block system shown in FIG. 3; The figure is from the memory circuit in the block system shown in FIG. FIG. 6 is a diagram illustrating pixel data read out for each field period; FIG. 6 is a diagram illustrating an example of the frequency spectrum of a frequency-modulated wave signal frequency-modulated with the pixel data;
FIG. 7 is a diagram (not shown) showing an example of the signal format of one block of the digital signal to be recorded on the digital recording track, and FIG. FIG. 9 is a diagram showing an example of the frequency spectrum of a wave signal, FIG. 9 is a diagram showing an example of the track pattern of the disk of the present invention, and FIG.
The figure is a block system diagram showing an example of a playback device for playing back discs of the present invention, and FIG. 11 is a diagram showing the original position within the screen and readout order of pixel data stored in the memory circuit in the playback device. , FIG. 12, and FIG. 13 are diagrams for explaining how non-transmitted pixel data is substituted and displayed by transmitted pixel data at the top and bottom of the screen in the reproducing device, respectively. 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...
OA converter, 18...recording signal output terminal, 23...
Scanning needle, 24...Tracking coil, 26...Pickup circuit, 27...Tracking servo circuit,
29... Reproduction signal output terminal, 30... AD converter,
35...Memory read/write controller, 42.
...Encoder. Patent applicant: Victor Japan Co., Ltd. Figure 1 Figure 2 (A) (B)

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 in a cycle of 4 fields. An information signal recording disk characterized in that information is recorded in a spiral or concentric track in a time-series manner. (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. An information signal recording disk according to claim 1, characterized in that: (3) A digital signal obtained by further modulating a digital signal in which multiple channels of digital data obtained by digitally modulating an information signal mainly consisting of a plurality of first still images is synthesized in block units in a time-series manner. a digital recording track in which one modulated wave signal is recorded, and a digital recording track formed immediately before and immediately after the recording track portion of each of the plurality of first still images of the digital recording track. and an analog recording track in which a second modulated wave signal obtained by analog modulation with a composite video signal regarding a second still image representing the content of the first still image of the recording track is recorded. 3. The information signal recording disc according to claim 2, wherein the frequency modulated wave signal is recorded as the second modulated wave signal.