JPS61107892A - Information signal recording disk reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of color reproducibility by time-base- multiplexing the picture element data of the first and second fields in the sequence of surfaces by three kinds in total of picture element data for one field and reproducing the frequency-divided disk by a modulated sound signal. CONSTITUTION:After the first FM signal of a frequency spectrum reproduced from an analog recording track by a video signal processing circuit 38 is FM- demodulated, etc., the signal is AD-converted by an AD converter 40, and picture element data are obtained. A demodulating frequency dividing multiplexing signal of the frequency spectrum removed from the circuit 38, after a horizontal synchronizing signal and a vertical synchronizing signal are respectively separated and extracted, is supplied to a sampling pulse generating device 42. To the generator 42, the third reference signal fp3 of one rotation period of a disk 30 is also supplied from a tracking servo circuit 37. After the demodulating frequency dividing multiplexing signals are supplied respectively to band filters 43 and 44 and a modulated frequency sound signal is separated and filtered, a reproducing sound signal of the first and second channels is supplied respectively from FM demodulating devices 45 and 46 to output terminals 47 and 48.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information signal recording disc reproducing device, and particularly for reproducing in high quality video and audio signals recorded on an information signal recording disc in the form of analog signals. The present invention relates to an information signal recording disk reproducing device.

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. This disk is called a video disk because the recorded information is mainly composed of composite video signals, and its recording track has analog modulation in which a carrier wave is modulated with an analog information signal. A composite video signal, etc. is recorded in the form of a modulated wave signal obtained by is recorded, and its address signal is a coded digital signal.However, since the main body of recorded information is an analog modulated composite video signal, etc., a track like the recording track of this video disc is used. Hereinafter, in this specification, for convenience, it will be referred to as an "analog recording track."

Problems to be Solved by the Invention However, the above-described video disc playback device plays back a video disc in which a frequency-modulated analog composite color video signal in which a luminance signal and a carrier color signal are band-sharing multiplexed is recorded. As a result, 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, hue is expressed by the phase of the playback carrier color signal relative to the phase of the color burst signal. Therefore, there is a problem in that color reproducibility deteriorates when a phase shift occurs in the reproduced color burst signal.

Therefore, the present invention provides a disc in which three types of pixel data for a total of one field, including pixel data of the first and second fields, are time-division multiplexed in a frame-sequential manner, and a modulated audio signal is frequency-division multiplexed. It is an object of the present invention to provide an information signal recording disk reproducing apparatus which solves the above-mentioned problems by reproducing information.

Means for Solving the Problems The information signal recording disk reproducing apparatus according to the present invention separately processes one frame's worth of luminance signals at a first sampling frequency and two types of color difference signals at a second sampling frequency. Luminance pixel data for a total of one field including pixel data of the first and second fields from the pixel data obtained by sampling and quantizing the pixel data.

Among the first and second chrominance pixel data, 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 above luminance pixel data of the second field. The first and second color difference pixel data are switched field by field and synthesized in time series, and are frequency division multiplexed onto the audio signal as a modulated wave signal and recorded on a spiral or concentric track. A device for reproducing an information signal recording disc that is
It comprises a reproduction means for reproducing the recorded signal on the disc, a pixel data demodulation means, a memory circuit, a memory control means, a video signal generation means, and an audio signal demodulation 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 chrominance 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. Further, by separating and demodulating the modulated audio signal in the reproduced signal by the audio signal demodulating means,
Obtain the playback audio signal.

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 1.2 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. Furthermore, 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 second
Since the first and second color difference pixel data of the field are synthesized and reproduced in time series for each field period,
Compared to the case where a conventional video disk reproducing apparatus reproduces a frequency-modulated wave signal frequency-modulated with a band-sharing multiplexed color video signal, the color difference signal and the luminance signal are not picked up and reproduced at the same time. Furthermore, the reproduced audio signal can be obtained simultaneously with the reproduced color video signal by the audio signal demodulating means. 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 a disk) 30 is a disk on which digital recording tracks and analog recording tracks (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 contents of the disc 30 to be reproduced (particularly the recorded information contents 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-file upper period F1, luminance pixel data Y1 of the first field out of 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 first field of color difference pixel data (R-Y)+ of the color difference pixel data related to the color difference signal R-Y for a total of one field, which will be described later, and a total of one field, which will be described later. Chrominance pixel data (B-Y) of the first field among the chrominance pixel data related to the chrominance signal 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 best one field period E4 during rotation, the color difference pixel data (RY)2 and (B Y)2 of the second field are
are alternately synthesized and recorded in chronological order every 1/2 horizontal scanning period. The luminance pixel data Y+ described above,
Y2.

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

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

In addition, each of the above-mentioned pixel data is recorded on one track destined for the rotation of the disk, of which luminance pixel data Y+ and Y2 are pixel data obtained by sampling and quantizing the luminance signal for one frame. It consists of one field that remains after thinning out one field, and is transmitted at the same frequency as the sampling frequency after thinning (for example, 4.5MH2), while two types of color difference pixel data (R-Y) + .

(RY)2. (B Y>1. (B-Y)2 represents one field of pixel data obtained by separately sampling and quantizing the color difference signals (RY) and (8-Y) for one frame. Consists of the remaining one field after thinning out, and has a frequency that is twice the sampling frequency after minus (e.g. 4.5 MHz)
Transmitted by . Therefore, if the video signal to be reproduced is, for example, an image such as a keyhole for convenience of illustration, then the sixth
If the previously recorded signal is reproduced as it is during reproduction of each one field period indicated by Fl and F3 in the figure, a reproduced image based on the luminance signal as shown in FIG. 7(A) will be obtained;
If the recorded signals are reproduced as they are during reproduction for each one field period indicated by F2 or F4 in the figure, each reproduced image of the color difference signals (R-Y) and (B-Y) will be reproduced as shown in FIG. 7(B). It is obtained by compressing the time axis to 1/2 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 of @2 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, red (R), green (G) and blue (
The three primary color signals of B) are supplied to a matrix circuit 4, where a luminance signal Y is generated.

They are converted into two types of color difference signals R-Y and B-Y, respectively. The luminance signal Y is passed through a low-pass filter 5 with a cutoff frequency of 6MH7.
The color difference signal R- is supplied to the AD converter 8 through
Y and B-Y are separately supplied to AD converters 9 and 10 through low-pass filters 6 and 7 with a cutoff frequency of 3MH7, 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 MHz and a second sampling pulse with a repetition frequency of 4.5 MHz. Then, the first sampling pulse is supplied to the AD converter 8, and the second sampling pulse is supplied to the AD converters 9 and 10, respectively. As a result, after sampling the luminance signal from the △D converter 8 at a sampling frequency of 9 MHz,
Luminance pixel data having, for example, 8 bits of quantization pits obtained by quantization is taken out and supplied to the memory circuit 13.

On the other hand, after separately sampling the color difference signals R-Y and B-Y from the AD converters 9 and 10 at a sampling frequency of 4.5 MHz,
Two types of color difference pixel data having a quantization bit count of 8 bits, for example, obtained by quantization are taken out and supplied to the memory circuit 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 a memory write controller 14 based on a synchronization signal from a synchronization signal generator (SSG) 11. To explain the operation in more detail, for convenience of explanation,
Assuming that the number of scanning lines in one field is 4 and the number of pixels sampled at a sampling frequency of 9 MHz per scanning line is 8, the number of luminance pixel data for one frame is 64 (
Since the sampling frequency is 4.5M)-IZ, the number of color difference pixel data for one frame is 32 (=4x4x2) for both RY and BY.

Of these, only the pixels indicated by diagonal lines in FIG. 9(A) are written into the memory circuit 13 as luminance pixel data. Figure 9 (A
) are shaded pixels in line #1 of the first field.
．． #3. #5° Odd numbered pixels of #7 and line #2 of the second field. #4. #6. #, 8 even-numbered pixels, and a total of one field worth of pixels. Therefore, the luminance pixel data having a sampling frequency of 9MH7 is thinned out every other pixel, so that the sampling frequency is substantially 4.5MHZ.

On the other hand, for 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. #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, both the first color difference pixel data and the second color difference pixel data have a sampling frequency of 4.5M)-I Z
The samples are thinned out every other time, so that the sampling frequency is substantially 2.25MH7.

In this way, one field of luminance pixel data and two types of color difference pixel data each consisting of pixel data of the first and second fields 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 5SG11. 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 the output, two types of color difference pixel data (R-Y)+ and (B-Y)+ of the first field at the position indicated by diagonal lines in FIG. 10(B) are sampled in the next one bright field. The color difference pixel data is read out serially at 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 at twice the speed, the first field The color difference pixel data will be read out in 1/2 field.

Therefore, each horizontal scanning period (H) of the above one field period
, the first field pixel data (R-Y)+ is read out of the first color difference pixel data regarding the color difference signal R-Y during the H/2 bright period in the first half, and the color difference signal R-Y in the second half H/2 period is read out. Among the second color difference pixel data related to B-Y, the pixel data (8-Y)+ of the first field 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 1-field light interval, the first and second color difference pixel data of the second field are read out in the shaded position in FIG. 10(D). (RY)z and (B Y)z are read out alternately and serially 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 digital to analog converter 16;

After being converted, it is supplied to the video signal processing circuit 17. The video signal processing circuit 17 is actually 3MHz from the DA converter 16.
Analog luminance signal and analog color difference signal R- in the transmission band of
Y and B-Y time division multiplexed signals are supplied, subjected to predetermined signal processing such as pre-emphasis, and then supplied to the mixing circuit 18 . The analog luminance signal and analog color difference signal each consist of only image information of the video period excluding the horizontal and vertical blanking periods.

On the other hand, 1st. A total of two channels of analog audio signals extracted from the second audio signal sources 19.20 are respectively supplied to frequency modulators 21.22, where, for example, 3.
43 MHz, 3.73 M'Hz (7) Each carrier wave is frequency-modulated and converted into a frequency-modulated wave signal, which is then supplied to the mixing circuit 18. As a result, mixing circuit 1
8 is an analog time division multiplexed signal from the video signal processing circuit 17 with a frequency spectrum shown as P in FIG. 11, and the first . A frequency division multiplexed signal with the second frequency modulated audio signal is generated, and this frequency division multiplexed signal is supplied to the frequency modulator 23. Frequency modulator 23
Frequency-modulates the carrier wave of about 7 MHz with this frequency division multiplexed signal, and outputs the frequency-modulated wave signal with the frequency spectrum shown by the solid line in FIG. Output to the device.

The frequency spectrum shown in FIG. 12 is the same frequency spectrum as that of the existing capacitance change detection readable video disc, and ■ is the 2.3M frequency spectrum of the frequency modulated wave signal.
It shows the carrier wave shift frequency band of Hz, "a is the frequency of 6,1M1-IZ corresponding to the sync tip, fl
) is the frequency of 6.6 MHz corresponding to the pedestal, f
a indicates a frequency of 7.9 MHz corresponding to the white beak. Further, IIL and IIU indicate the lower sideband and upper sideband of the frequency-modulated time division multiplexed video signal;
I[u indicates the lower sideband and upper sideband of the frequency-modulated audio signals A+ and A2, which are further frequency-modulated. ■ is a two-channel frequency modulated audio signal A1. A2 carrier wave 3
．． 43MHz and 3.73MHz 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.
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 a signal having a signal format as shown in FIG. 13 is recorded in block units. :44
．． The first signal is a digital signal synthesized in time series at a transmission frequency of 0.056 kHz (or 44.100 kHz), obtained by frequency modulating a carrier wave of about 7 MH2, for example.
A frequency modulated wave signal (second FM signal) having a frequency spectrum as shown in FIG. 4 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, Ch-2, Ch-
3 and Ch-4 are each one of the 16-pit digital signals.
Indicates the location of the word. As this digital signal, the voice signal (audio signal) is pulse code modulated (PCM).
)L, there is a digital audio signal obtained by PCML, or a video signal obtained by PCML.

Here, of the four channels of digital data, two channels are digital video signal data related to still images (including 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 a judgment function that is connected to the disc playback device, and is a signal that is modulated using a self-clockable modulation method and is limited to the audio band. It is. In addition, the compressed audio data described 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, and then band compression, This is digital data that has been compressed in one or two of the following: compression in the bit direction (for example, non-linear d-densization) or compression in the time axis. Also the 13th
P and Q shown in the figure 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.

For example, let each word of Q be X23'+X5+XJ-toX+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 generator polynomial, and if the resulting remainder is zero, it is used to detect that there is no error.In addition, in Figure 13, Adr is used for random access, etc. It shows the multiplexing position of 1 bit of various control signals (address signals) used. 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.
．． 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. 12 and a frequency modulated wave signal (second FM signal) having a frequency spectrum as shown by the solid line in FIG. 14. 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. The burst-shaped first reference signal fP I and the burst-shaped second reference signal RP 2 are alternately switched and arranged in an interleaved manner, and are generated in relation to the switching positions of fp+ and fpz. A signal consisting of the third reference signal [ρ3] 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 is subjected to a known developing process, and then a known disc manufacturing process is used to produce a disc 30 having an electrode function and a track pattern as shown in FIG. 15 without a needle guide groove formed therein. .

In FIG. 15, the disk 30 has a spiral track T.
An information signal consisting of a video signal, an audio signal, and an address signal is converted into a frequency modulated wave signal (first FM signal, second FM signal), and bits are intermittently formed according to the information content and recorded. has been done. Of one continuous spiral track T shown by a solid line in FIG. 15, the tracks corresponding to each rotary valve of the disk 30 are designated as tl, tl, t31.
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 (1H), a bit of the first reference signal fP, the first bit of the analog recording track, is placed on both sides in the longitudinal direction at a position corresponding to the recording horizontal blanking period for the analog recording track. 2 reference signals fp 2 bits are formed.

Only one of the bits of the reference signals rρl and fP2 is formed at the intermediate position between the center lines of adjacent tracks, and the side where the reference signal fρl+rp2 is recorded for the - track. will change for each track. That is, in FIG. 15, the track of the reference signal rp1 is shown by a broken line, and the track of the reference signal fP2 is shown by a dashed line.

-Vl, V2. 3+... indicates the position of the vertical synchronization signal of each field. Also, each track tl, t
2 [3. ..., that is, the reference signal "ρ1 and fP
2 switching position vI+VS, v9*...
For example, the third reference signal rρ3 is recorded at approximately 31-1 pA.

Further, one rotation period of the disk 30 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. 15a.

Tracks within the range shown in b, c and d tl, t2t3
．． It is recorded in L4.

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 30.

Furthermore, the digital recording track (5, t6) of the disk 30
．． j7. . . . is also formed on the spiral track T, but one block of signals in the signal format shown in FIG. 13 is synthesized in time series and then recorded as the second FM signal. Vertical blanking period recording part a
-d does not exist.

However, the digital recording track t5. t6゜tl,
..., the above reference signal fp3 is recorded in alignment with the reference signal fp3 of the analog recording track (j+ to t4) in the radial direction of the disk 30, and the reference signals fp+ and fp2 are recorded on both sides thereof. Similarly, it is recorded in 1H cycles. 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 according to the present invention has the above-mentioned analog recording track and an image representing the information content of a still image recorded on the digital recording track immediately after that, as shown in FIGS. 10(A) to 10(D). It is characterized in that the time-division multiplexed video signal transmitted in this way, and furthermore, the audio signal of the audio representing the information content is recorded.

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

In FIG. 1, a disk 30 on which analog recording tracks and digital recording tracks are mixed and recorded is placed on a turntable 31, and is driven by a motor 32, which is not shown in the drawing, They are rotated synchronously based on the output signal. The scanning needle 33 is moved along with the tracking coil 34 in the radial direction of the disk 30 by the feed feed [m35] while sliding on the disk 30. Since the disk 30 has an electrode function and the scanning needle 33 is formed with an electrode,
An electrostatic capacitance is formed between the disk 30 and the electrode of the scanning stylus 33, which changes in response to changes in the geometry of the recording track, and this change is converted into an electrical signal by a pick-up circuit 36 in a known manner. is converted to

The reproduction signal (RF
The multiplied signal is supplied to a known tracking servo circuit 37, where the reference signal rp+fρ2 is discriminated and separated, envelope-detected, and the detected outputs are differentially amplified and converted into a tracking error signal. . This tracking error signal is applied to the tracking coil 34,
The tip of the scanning needle 33 is momentarily and minutely displaced in the track width direction so that the scanning needle 33 always scans the information signal recording track without track deviation.

Further, the reproduced signal taken out from the pickup circuit 36 is supplied to the video signal processing circuit 38, where it undergoes FM demodulation and
While undergoing signal processing such as de-emphasis, it is outputted to a known digital audio disc playback circuit (not shown) via an output terminal 39, where the digital signal played back from the digital recording track is demodulated and played back. .

Here, assuming that the analog recording track is being reproduced normally, the first FM signal having the frequency spectrum shown in FIG. 12 reproduced from the analog recording track by the video signal processing circuit 38 is subjected to FM demodulation, etc. The pixel data is supplied to the AD converter 40, where it is subjected to analog-to-digital conversion to obtain pixel data as shown in FIGS. 10(A) to 10(D). 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 frequency division multiplexed signal having the frequency spectrum shown in FIG. 11 taken out from the video signal processing circuit 38 is separated into a horizontal synchronization signal and a vertical synchronization signal by a synchronization separation circuit 41, and then sent to a sampling pulse generator. 42. This sampling pulse generator 42 receives the third reference signal fp of one rotation period of the disk 30 from the tracking servo circuit 37.
3 is also supplied.

Further, the demodulated frequency division multiplexed signal is passed through a bandpass filter 43.
and 44, respectively, where A+, A
After the frequency-modulated audio signal indicated by 2 is divided into 11 IP waves, it is supplied to FM demodulators 45 and 46 for FM demodulation. This causes the FM demodulator 45 to output the first
The reproduced audio signal of the channel is output, and the FM demodulator 46
The reproduced audio signal of the second channel is outputted to the output terminal 48.

The AD converter 40 performs analog-to-digital conversion based on the sampling pulse from the sampling pulse generator 42, converts it into the above-mentioned pixel data, and supplies it to the memory circuit 49. The memory circuit 49 includes a synchronization signal generator (S
A write/read control pulse and a latch pulse generated by the memory read/write controller 51 based on the output signal of the SG) 50 are respectively supplied, and the luminance pixel data and two types of color difference are reproduced per rotation of the disk 30. 8 pixel data are loaded into dedicated field memories.

FIG. 2 shows a block diagram of one embodiment of the memory circuit 49. In the same figure, the above pixel data serially taken out from the AD converter 40 is supplied to latch drivers 611 to 618, respectively, via an input terminal 60, and then sent to a terminal 621 or 62 by a memory read/write controller 51.
It is latched by a 4.5 MHZ latch pulse coming through 2. Since the input latch pulse of the terminal 62+ and the input latch pulse of the terminal 622 have a phase difference of 180 degrees, the first input pixel data is the latch driver 61=
, 612.61s, 617, and the next input pixel data is sent to the latch driver 613゜614.616.6.
1s, and thereafter, each time pixel data comes in, it is alternately sent to the first latch group of latch drivers 611, 612.61s and 617, and the second latch group of latch drivers 613, 614.61s and 618. Latched.

The pixel data latched by the latch drivers 61+ to 618 are individually transferred to the memory element groups 631 to 638, respectively, until the next latch pulse arrives. Here, the memory element groups 631 to 638 include the controller 5.
1, a write pulse or read pulse of <2.25 MHz is applied as shown in R/W, but the write pulse is applied during one field reproduction period of the luminance pixel data Y1 of the first field shown by Fl in FIG. The voltage is applied only to the memory element groups 631 and 633, and the voltage is applied to each line during one field reproduction period of the first field color difference pixel data (RY) and (8-Y)+ indicated by F2 in FIG. During the first half of each line, the voltage is applied only to the memory element group 635, and during the second half of each line, it is applied only to the memory element group 637. Further, during one field reproduction period of the luminance pixel data Y2 of the second field indicated by F3 in FIG. 6, the penetration pulse is applied only to the memory element groups 632 and 634.
Further, a write pulse is applied to the memory element group 636 during the first half period of each line during the one-field reproduction brightness period indicated by F4, and to the memory element group 638 during the latter half period of each line.

Therefore, the luminance pixel data Y1 of the first field is written alternately to the memory element groups 631 and 633, and the luminance pixel data Y2 of the second field is alternately written to the memory element groups 632 and 634, respectively. Further, the first color difference pixel data (RY)+ of the first field is stored in the memory element group 6.
35, and the first color difference pixel data (RY) 2 of the second field is written to the memory element group 636. Furthermore, the second color difference pixel data (B-Y
)+ is written to the memory element group 637, and the second color difference pixel data (B-Y)2 of the second field is written to the memory element group 638.

Each of the memory element groups 631 to 638 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. 3, or memory element group 63+, consisting of 64k RAM (Random Access Memory)
A total of one field worth of luminance pixel data is written in memory element groups 635 and 638 . and 637 and 63
The storage capacity is sufficient to write a total of one field worth of first and second color difference pixel data in each of the memory cells 8 and 8.

The pixel data of the first field is written into the memory element groups 63+, 633, 63s, and 637 as described above, and their addresses are specified by the memory address signal generated by the controller 51 and input to the terminal 641; , memory element groups 632, 634, 63s and 63 into which the second field pixel data is written.
The address of 8 is specified by a memory address signal input from the controller 51 via the terminal 642.

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 value corresponding, for example, 1:1 to the line of one field, and the lower 8 bits indicate a value corresponding to the pixel position (sampling point) in that one line.

When all the pixel data reproduced during one rotation period of the disk 30 has been stored in the memory element groups 631 to 638,
Next, each of the memory element groups 63+ to 638 is simultaneously accessed, and a total of eight pixel data read from the designated address is sent to the latch drivers 651 to 658 at the terminal 66.
are latched simultaneously based on the latching pulses. This latch pulse is a pulse of 2.25 MH7 generated by the controller 51, and the drive pulse generated by the controller 51 within that period is the terminal 6.
7+, 672, 673, and 674 in a time-division manner, and within one period of the latch pulse, the drive pulse enters the terminals 68 and 69 once in a time-division manner. do.

As a result, the φ luminance pixel data temporarily stored in the latch drivers 651 to 654, respectively, is read out in a time-division manner in 9MH2, and is supplied to the DA converter 55 shown in FIG. 1 via the output terminal 52. On the other hand, at the same time, the first color difference pixel data temporarily stored in the latch drivers 655 and 656, respectively, and the second color difference pixel data temporarily stored in the latch drivers 657 and 658, respectively, are time-divisionally stored. The signal is read out at 4.5 MHz and supplied to the DA converters 56 and 57 shown in FIG. 1 via output terminals 53 and 54.

Here, as described above, the memory element groups 631 to 638 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. By devising the output order of read addresses generated by
) with diagonal lines (marked with black circles in Figure 3)
) is read out in a so-called staggered manner in the order shown by the solid line in FIG. are read out in a so-called staggered manner in the order shown by broken lines in the figure.

As a result, the untransmitted pixel data shown in FIGS. 9(A) and (8) and also the blank area in FIG. As shown in Fig. 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 with black circles 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 image is displayed in an array and the combination of the array pixel data is displayed differently in both field reproduction periods, the field image appears to be less susceptible to deterioration in main vertical resolution. 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 the extent that it is visually noticeable.

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. .

Note that the four memory circuits described above are used to generate a still image from a conventionally known still image for obtaining a still image from a digital video signal among the digital signals reproduced from the digital recording track among the reproduction signals from the three terminals described above. It can also be shared with the memory circuit (field memory) in the decoder.

Returning to FIG. 1 again, the DA converters 55 and 56
The reproduced luminance signal and the two types of reproduced color difference signals R-Y and B-Y, respectively, which are digital-to-analog converted and extracted by 57 and 57, are simultaneously supplied to an encoder 58, where the composite synchronization signal and color burst signal from 5SG50 are supplied simultaneously. After the signal is added and converted into a composite color video signal conforming to a predetermined television system, it is outputted to a monitor display device (not shown) via an output terminal 59.

In this way, the disc 3 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 image (moving image or 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 images one after another, the user can search for a desired digital recording track in a short time.

Moreover, when playing back analog recording tracks, the output terminal 47
．． The recorded edge information content of the digital recording track can also be known from the reproduced audio signal taken out from 48.

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. Also,
Although the audio signal is frequency-modulated and frequency-division multiplexed into the time-division multiplexed video signal, the audio signal may be modulated using another modulation method and recorded, and then demodulated by the reproduction system.

Effects of the Invention As described above, according to the present invention, a disc on which luminance pixel data and two types of color difference pixel data for a total of one field including pixel data of the first and second fields are recorded serially and realistically. This can occur with conventional video discs on which band-sharing multiplexed color video signals are recorded.

There is no beat or distortion between the luminance signal and the two types of color difference signals, and a high-quality reproduced color video signal with an improved S/N ratio can be obtained. Since it is generated within the color burst signal and added to the input video signal of the encoder, it is possible to prevent deterioration of color re-flatness due to phase shift of the color burst signal that may occur during the recording and reproduction process of the color burst signal. When applied to the analog recording track of a disc in which digital recording tracks and analog recording tracks are mixed together, the color video signal for high-speed search of the digital recording track (still images is To be able to reproduce in high quality a video (of course, a moving image is also possible) from the analog recording track, and to reproduce an audio signal at the same time to more accurately identify the information content of the already recorded signal on the digital recording track. It has many features such as the ability to

[Brief explanation of the drawing]

FIG. 1 is a block system diagram showing an embodiment of the playback device of the present invention, FIG. 2 is a block system diagram showing an embodiment of the memory circuit in the block system shown in FIG. FIGS. 4 and 5 are diagrams showing the original position within the screen and the readout order of pixel data stored in the memory circuit, respectively.
The figures explain how non-transmitted pixel data is replaced with transmitted pixel data at the top and bottom of the screen for display in each reproducing device. FIG. Fig. 7 is a diagram schematically showing the
Figure 8 is a block system diagram showing an example of the recording system of the disc; FIG.
FIG. 10 is a diagram explaining pixel data stored in the memory circuit in the block system shown in FIG. 8; FIG. The figure shows an example of the frequency spectrum of the frequency division multiplexed signal in the block system shown in FIG. 8, and FIG. FIG. 13 is a diagram showing an example of the signal format of one block of digital signals to be recorded on a digital recording track, and FIG. 14 is a diagram showing a frequency-modulated wave to be recorded on a digital recording track frequency-modulated with the digital signal. FIG. 15 is a diagram showing an example of a frequency spectrum of a signal, and FIG. 15 is a diagram showing an example of a track pattern of an information signal recording disk to be reproduced. 1.30... Information signal recording disk (disc), 11.
50... Synchronous signal generator (SSG), 12°42...
- Sampling pulse generator, 13.49... Memory circuit, 14... Memory write controller, 15...
・Memory read controller, 16.55-57...
DA converter, 19.20... audio signal source, 21-23
...Frequency modulator, 33...Scanning needle, 34...Dragging coil, 36...Pickup circuit, 37
...Tracking servo circuit, 39... Reproduction signal output terminal, 40... DA converter, 43.44... Bandpass filter, 45.46-, FM demodulator, 47.48...
- Playback audio signal output terminal, 51...Memory read/write controller, 52-54...Terminal, 55-57
...DA converter, 58...encoder, 59...
Reproduction color video signal output terminal, 60... Pixel data input terminal, 62+, 622.66... Latch pulse input terminal, 63+ to 638... Memory element group, 641° 642... Memory address signal input terminal . Patent applicant: Victor Company of Japan Co., Ltd. Figure 10 4.5MHz 4.5MHz
4.5MHz 4.5MHz Fig. ■111 Liquid soft fMHzl Fig. 12 Fig. 13 [M

Claims (3)

[Claims] (1) Total 1 including pixel data of the first and second fields extracted from the pixel data obtained by sampling and quantizing the luminance signal for one frame at the first sampling frequency.
Luminance pixel data for a field and two types of color difference signals for one frame are each separately divided into 1/2 of the first sampling frequency.
The first field contains pixel data of the first and second fields respectively extracted from the pixel data obtained by sampling and quantizing at twice the second sampling frequency.
and second chrominance pixel data, 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 second chrominance pixel data of the second field. The first and second color difference pixel data are switched every field and synthesized in time series, and are frequency division multiplexed onto an audio signal which is a modulated wave signal, and are recorded on a spiral or concentric track. a reproducing means for picking up and reproducing a previously recorded signal on the information signal recording disc using a reproducing element; and a pixel data demodulating means for obtaining the luminance pixel data and the first and second color difference pixel data from the reproduced signal of the reproducing means. , a memory circuit to which each pixel data from the pixel data demodulation means is serially supplied;
After each field of pixel data from the pixel data demodulating means is written into the memory circuit, the accumulated pixel data is read out while the pixel data thinned out during recording is supplemented with surrounding transmitted pixel data. and memory control means for reading out the luminance pixel data at the first sampling frequency, and reading out the first and second color difference pixel data from the memory circuit in parallel at the second sampling frequency, respectively;
means for generating and outputting a reproduced color video signal compliant with a desired television system from each pixel data read from the memory circuit; and an audio signal converted into the modulated wave signal from the reproduced signal from the reproduction means. 1. An information signal recording disk reproducing apparatus comprising: an audio signal demodulating means for separating and filtering and demodulating the information signal. (2) The luminance pixel data and the first and second chrominance pixel data are each subjected to digital-to-analog conversion, and then frequency-division multiplexed to the audio signal which is the modulated wave signal, and the frequency-division multiplexed signal is is converted into a frequency modulated wave signal and recorded on the spiral or concentric track, and the pixel data demodulating means is used to convert the frequency modulated wave signal obtained by frequency demodulating the reproduced frequency modulated wave signal from the reproducing means. A patent claim characterized in that the analog video signal is separated and filtered from the division multiplexed signal, and the analog video signal is AD converted to obtain the luminance pixel data and the first and second color difference pixel data, respectively. The information signal recording disk reproducing device according to item 1. (3) The information signal recording disk further modulates a digital signal in which multiple channels of digital data obtained by digitally modulating information signals mainly consisting of multiple still images are synthesized in block units in a time-series manner. a digital recording track in which the first modulated wave signal obtained by the first modulated wave signal is recorded; an analog recording track in which a second modulated wave signal obtained by analog modulation with a composite video signal related to a video representing the content of the still image of the digital recording track is formed, and A frequency modulated wave signal is recorded as the second modulated wave signal, and the pixel data demodulating means is configured such that the reproducing element reproduces the analog recording track in the same manner as in the normal reproduction of the digital recording track, or An analog video signal is separated and filtered from the frequency division multiplexed signal obtained by frequency demodulating the reproduced frequency modulated wave signal during scanning at a slow transfer speed, and the analog video signal is AD converted to obtain the luminance. pixel data and the first
3. The information signal recording disk reproducing apparatus according to claim 2, wherein the information signal recording disc reproducing apparatus is configured to obtain the second color difference pixel data and the second color difference pixel data.