JPS62122490A - High-definition picture signal recording system - Google Patents

Abstract

PURPOSE:To attain the recording of a high-definition picture signal by recording two kinds of color picture element data alternately at each word obtained by quantizing the 1st and 2nd chrominance signals after sampling by a sampling frequency equivalent to 1/2 time a luminance signal. CONSTITUTION:The luminance signal of a high-definition picture signal is sampled and quantized by the 1st sampling frequency fs to be bronght to a luminance picture element data group of 8 quantized bits. Further, a broad band chrominance signal and a narrow band chrominance signal are sampled by the 2nd sampling frequency fs/2 separatedly and quantized separately to form the 1st and 2nd chrominance picture element data group of quantized bits (8 bits). Luminance picture element data Y0, Y1... are arranged on high- order 8 bits of each word, the 1st and 2nd color picture element data Calpha0, Calpha1... and Calpha0, Calpha1... are arranged on low-order 8 bits of each 1 word and the 1st and 2nd color picture element data are arranged at each word alternately. Thus, when picture element data Y2, Calpha1 are erroneous and not corrected,the data Y0, Calpha0 are replaced and when the picture element data Y3, Calpha1 are not corrected, the data Y1, Calpha0 are replaced and not made remarkable so much on a picture.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-definition image signal recording system, particularly a system for recording pixel data obtained by digital pulse modulation of a high-definition television signal onto a recording medium.Prior art So-called high-definition television systems (hereinafter also referred to as high-definition systems), which can transmit images with a much higher level of RJ and higher quality than current color television systems (NTSC1J type, etc.), are becoming more popular than before. being researched. This high-definition television signal (high-definition signal) has, for example, a scanning line count of 1125, a yield frequency of 60H2, r (! degree), a signal band of 20MHz, and a color signal of a wideband color signal of band 7.0M ll z and a band 5. ．．
Two types of 5 MHz narrowband color signals are transmitted. There are several prototypes for recording this high-definition signal, which is an analog signal, on a video disc, and as mentioned above, the high-definition signal has an extremely wide frequency band 5 to 6 times that of the current color television signal. Therefore, recording was performed after band compression was performed using techniques such as Nyquist sampling and frame correlation. Furthermore, when reproducing the video disc, the reproduced video signal is demodulated and then band expanded to obtain a reproduced high-visicon signal.

Problems to be Solved by the Invention However, there is a problem in that the circuit configuration for band compression and communication described above is extremely complex and expensive.

It was. On the other hand, digital audio discs may also record digital video signals with color still images that play an auxiliary role to support the imagination of the listener who listens to the playback blindness of the digital audio A signal. The high frequency signal is subjected to digital pulse modulation (PCM').
Until now, there has been no digital audio disc on which the digital video signal obtained by s) is recorded.

Therefore, the present invention samples the first and second color signals among the degree signal and the first and second color signals that constitute a high-definition image signal at a sampling frequency that is twice as high as the luminance signal. After transformation ω
The object of the present invention is to provide a high-definition image signal recording system that solves the above problems by alternately recording two types of color pixel data for each word.

Means for Solving the Problems The high-definition image signal recording method according to the present invention uses the luminance signal as the first of the luminance signal and the first and second color signals that constitute the high-definition image signal. After sampling at the sampling frequency, the first and second color signals are converted to a pixel data group of 1+ degree pixel data with the number of bits m bits I~ (where m is an integer of 2 or more). means for converting the first and second color pixel data groups of m bits into a sampling frequency using a second sampling frequency that is one or two times the frequency of the first sampling frequency; , luminance pixel data is arranged in the first half or second half m bits of each word, and first and second color pixel data are arranged in the remaining m bits, and the first and second color pixel data are arranged in the remaining m bits. A multi-word pixel data section in which the second color pixel data is arranged alternately word by word is obtained, and a multi-word header (Ω8) is generated that defines the transmission and reproduction conditions of the image in the pixel data section. It consists of means for generating a digital signal of A-mat (a signal) synthesized in time series at the beginning position of the pixel data portion, and means for recording this digital signal 8@ on a recording medium.

The luminance pixel data obtained by sampling the luminance signal and the first and second color signals constituting the high fI'1111 degree image signal (high-definition signal) at a predetermined sampling frequency and then converting the luminance signal to the luminance pixel data. Among the first and second color pixel data, the number of bits for each word is half the number of bits for each word, and the first and second color pixel data are recorded in bits alternately for each word. Recorded with half the number of bits per word. For this reason, luminance pixel data is recorded in the middle of one word, and color image data of the same scale is recorded and reproduced in units of two words, so even if error data that cannot be corrected occurs, it will not be noticeable on the image due to previous value hold. It becomes possible to play without standing up.

Embodiment FIG. 1 shows an embodiment of a signal format of the main part of a digital input bow recorded in the method of the present invention. As shown in the figure, header signal 1 consists of 6 words, and 1 word consists of 16 bits h.

Each word is transmitted in bit order from the most significant bit (MSB> to the least significant bit), and the header signal 1 is transmitted sequentially from the first word to the sixth word.Header signal 1μ Signal format as described below. Then, the conditions for transmitting and reproducing the image by the pixel data section (image data section) 2 for one straight line segment or one horizontal line segment that follows is defined.The pixel data section 2 has 6 pixels as shown in FIG. The signal format is such that pixel data for 8 bits and 1 pixel data are arranged two per word.

C1 As mentioned above, the high-definition image signal (high-definition signal) includes a luminance signal with a band of 20M tlz, a wideband color signal with a band of M7.0Ml-1z, and a band of 5.5M
The luminance signal is sampled at the first sampling frequency t's, and then filtered into a 8-bit chrominance signal, t! im pixel data group. Furthermore, the broadband color signal and the narrowband color signal each have a frequency f
After being sampled separately at a second sampling frequency of s/2, the first and second color pixel data 1T having a number of 8 bits of ψ-modified bits are obtained. In Figure 1, Yo, Yl
, Y2, ... are the above luminance pixel data, C, C,
C, . . . are αOC1C2, the above first color pixel data, Ca. , Cβ1°C,...
. is the above-mentioned second color pixel data.

β2 -J, as can be seen from FIG. 1, the luminance pixel de.

- data are arranged in the upper 8 bits of each word, the first and second color pixel data are arranged in the upper 8 bits of each word, and the first and second color pixel data are arranged in the upper 8 bits of each word. are arranged alternately.

FIG. 2 shows another embodiment of the signal format of the main part of the digital signal recorded in the method of the present invention. Fig. 1 shows the signal format when transmitting a digital signal through a 1-channel transmission line (A format, but this embodiment shows a signal format when transmitting a digital signal over a 2-channel transmission line. In the process of recording and reproducing such digital signals, if there is a problem with the transmission path or recording medium and an error occurs in the data, it is usually corrected to the correct value by the error correction circuit, but sometimes the correction cannot be completed. At that time, the previous value hold circuit operates.If the pixel data Y2.CC1, is erroneous and cannot be corrected, Y2.Ca1 is replaced with Y and C(xo.Similarly, the pixel data Y3.Yl when Cβ1 is not corrected.

Ca. is replaced.

That is, in this embodiment, the pixel data to be replaced for the pixel data that has the above error and cannot be corrected is the pixel f--2, which is two pixels before, for the luminance pixel data, and for the color pixel data. Since the data are adjacent color pixel data, errors are difficult to see in the image reproduced on the cathode ray tube. In other words, when a digital signal in the format shown in Fig. 1 is transmitted (recorded/played) using a 16-pit transmission path 2 channel as shown in Fig. 2, it is assumed that uncorrectable error data Even if this occurs, it can be played back without making it noticeable on the image.

Next, to explain the header signal, FIG. 3 shows an example of the signal format of the header signal 1 shown in 1. The first word 3 of the header signal has a fixed pattern of the same ! II signal is arranged, and its value is rFFFFJ in hexadecimal notation, this header signal and the one immediately after it are transmitted using two channels of the four-channel transmission path of the digital IO disk, which will be described later. Indicates that a digital video signal (pixel data) of a double straight line segment or one horizontal line segment is transmitted, and in the case of rFFFEJ, it is transmitted using one of the four desennenel transmission channels. .

An identification signal is arranged in the second word 4, and its MSB and the next bit, a total of two bits 4a, define the content of high-definition image data to be transmitted immediately after this header signal.

In the third bit 4b of the second word, a code for identifying whether the image data is full-frame image data or a compressed image obtained by compressing full-frame pixels into a half-frame is placed. Compressed image data is transmitted on a horizontal scanning line, with odd-numbered sampling points consisting of odd-field data and even-numbered sampling points containing only even-field data, and is transmitted in half the time compared to full-frame image data. . In addition,
The above-mentioned full frame image data is taken in as is into the memory circuit in the re-coupling circuit. On the other hand, the compressed image data is taken into a predetermined address of the memory circuit, and the image data that is not transmitted during playback is reproduced and overwritten by any of the surrounding transmitted image data, so that the 7111il!
Either, so-called staggered reproduction is performed, or data obtained from the front nose of the four-element data is interpolated for surrounding transmission. Although compressed image data is accompanied by some signal deterioration, the image transmission period can be halved, and when a dedicated reproducing apparatus is constructed, the image memory can be halved.

In addition, the 2 bits at the 4th and 5th pits of the second word indicated by 4C in FIG.
An identification code for the image type of I11 is arranged, and the sixth bit 4d of the second word indicates whether the pixel data to be transmitted following this header signal is in the order along the scanning line or in the direction perpendicular to the scanning line. i! transmitted in any order of the order of i!
A needle indicating whether 4I is obtained from the ii elementary data is placed.

Furthermore, in the 7th bit 4e of the second word, a command is placed to control the first part of the screen where the image collection data that follows the header signal starts to be written, and immediately before the image data that starts to be sent among the pixel data of the entire screen. 40 in the header signal is a predetermined hook. Further, a full screen end command which is set to a predetermined value when full screen transmission ends is placed in the eighth bit 4f, and by detecting this command, the screen cut can be switched most quickly. Further, the ninth bit 4g specifies the memory brain to be input when transmitting image data to the decoder described above. 2 for 10th bit 4h
A code indicating that one of the two memory circuits (image memory plane) is to be input to and output from the display side memory circuit is arranged.

Further, a code for instructing display/non-display of an image is assigned to the 13th bit 4k. Further, 41° 4j, 4Il and the 15th and 16th bits, it2 bits 4m, are reserved, and no code is placed there for the time being.

Further, in the header signal No. 39-5 of the header signal shown in FIG. Placed. Furthermore, the fifth word 7
For the time being, no code δ is assigned to the sixth word 8.

FIG. 4 shows an example of the signal format of a digital video signal. Immediately after the header signal 9 in the format shown in FIG. 3, pixel data in the format shown in FIG. The header signal 9 and the pixel data section 10 are synthesized in time series for each unit.

Next, to explain the 1S8B system of the present invention, FIG. 5 is a block system diagram of an embodiment of an 8Vt image collection, and FIG. 6 is a block system diagram of an embodiment of the image formatting section. FIG. 7 shows a block system diagram of an example of the main parts of the disk recording system. The image acquired by the image recording device shown in FIG. 5 is converted into the format shown in FIGS. 1 and 2 by the device shown in FIG. 6, and then recorded on a disk by the recording system shown in FIG. 7. . In FIG. 5, an image to be recorded (a still 1L image or a partial moving image) is converted into an electric signal (color video signal) by a high-definition camera 11 or a high-definition telopper 12 and then switched to a switch]ν13
Here, one of the signals is selectively output. switch p
The color video signal taken out from 13 is the aforementioned high-definition signal with 1125 scanning lines and 60H2 field frequency, and is digitally pulse-modulated by A/D converter 14 and converted into 8-bit quantized image data (
pixel data).

Here, as described above, the high-definition signal consists of a luminance signal and two types of color signals, and the A/D converter 14 separately and independently converts these 311 types of video signals into 8/D'a. M! It has a circuit section that performs I+ operation. As a result, from the A/D converter 14! I
[! Luminance pixel data and first and second color pixel data are retrieved in parallel. Here, the sampling frequency fs for sampling the luminance signal of "-2" is 33.75 kHz, which is the horizontal scanning frequency of the high-definition signal.

Furthermore, assuming that the number of sample points per horizontal scanning period of a conventional digital audio disc is 576, considering that the conventional 7 aspect ratio is 4:3 and that of a high-definition signal is 5=3, for example, 48.6MH7 (=576X
2X (5/4)X33.75kHz).

Therefore, the sampling frequency fs/2 for people who sample two types of color signals separately is 24.3M)-(z.

The above three types of pixel data taken out from the Δ/D converter 14 are supplied to and stored in a frame memory 15 that stores each frame separately. The above three types of pixel data whose sampling frequency is converted to 44.1 kHz and read out in parallel from the frame memory 15 are D/
The image content is D/A converted by the Afl converter 16 into an r luminance signal and two types of color difference signals (supplied to the 12t monitor TVI 7, where the image content is checked. The three types of image data groups read out are sent to the VT via the PGM processor 18.
R19 digitally records the image on the magnetic tape as an image.

The magnetic tape thus obtained is then played back by a VTR 20 shown in FIG. 6, and the playback signal 4. iP
After being converted into the original three types of pixel data groups by the CM processor 21, they are written to the first magnetic disk of the magnetic disk device 23 through the computer 22. By inputting image transmission and reproduction conditions to the computer 22 through the input VTL 24, the combicoater 22 generates a header signal in the signal format shown in FIG. The image data group recorded on the magnetic disk is recorded on a second magnetic disk while being time-edited. When recording the compressed image, the pixel data group reproduced from the first magnetic disk is compressed by the computer 22 and recorded twice onto the second magnetic disk. The three types of pixel data reproduced from the second magnetic disk are supplied with a header signal (=J) by the computer 22, and are supplied to the PCM processor 25 while being converted into the signal format 1 shown in FIG. Error correction code and error check code are added, and the time axis is compressed so as to be transmitted within the video 11 of the composite iron (GL signal), and the time code is added to the VTR26.
and recorded on the magnetic tape.

The recorded signals on the magnetic tape recorded by the VTR 26 are reproduced, and are further processed through a known PCM processor as shown in FIG.
The signal is converted into a digital video signal having the signal format shown in FIG. 4 and is supplied to the format 1 conversion circuit 30 from the input terminal 28 shown in FIG. Further, in synchronization with this reproduced digital video signal, the digital video signal reproduced from the master i-wave is supplied to the format 1 conversion circuit 30 via the input terminal 29. Format 1 to conversion circuit 30 generate and output digital signals synthesized in time series in block 111 of the signal format shown in FIG. 8, which is known in the digital Φ audio disc.

Here, in the signal of one block shown in FIG. 8, S indicates the arrangement of the 8-bit fixed pattern synchronization signal indicating the start of the block, Ch-1, Ch-2, 0h-3.
and Ch-4 each indicate the location of one word of the 16-pit digital signal (ie, the digital audio signal and digital video signal) of each channel of the four channels.

Further, P and Q shown in FIG. 8 are 16-pit error correction codes. Furthermore, CRC is a 23-bit error detection code.
Ch-1 to Ch-4, P, Q arranged in the same block
For example, each word of
This is the 23-bit remainder obtained when dividing by the generator polynomial, and when re-1, the signals from the 9th bit to the 127th bit of the same block are removed by the generator polynomial,
When the resulting remainder is zero, it is used to detect that there is no error. Furthermore, in Figure 8, △d"
are various types of 111 used for random access etc.
Indicates the multiplex position of 1 bit of control signal (address signal)
0 This atII 1m FJ signal distributes each bit f-ta, and one bit is transmitted in one block. For example, all bits of the atII all signal are transmitted by 196 blocks (that is, the control signal is composed of 196 bits). ., ).

Furthermore, (J is a spare 2-pin I- called a user's bit, which transmits a language for connecting a computer to a playback device and performing interactive operations. 130 gl bits from '1JS to () constitute one block of signals,
The digital signal is transmitted through this program [44.1Kl-
It is synthesized at 12 frequencies and transmitted in time series. The above-mentioned 196-bit control signal has a configuration in which four types of address codes of 49 bits each are synthesized in chronological order, and these four types of address codes all have the same signal format.

In this way, among the i14 channel signal transmission paths of Ch-1 to Ch-4, for example, the digital audio signal has a sampling frequency of 44.1 kHz and a quantization pitch of 16 pits. The header signal 8 and image data 9 are arranged in two words indicated by Ch-3 and Ch-4 and transmitted sequentially.

The digital signal taken out from the A-mat conversion circuit 30 in the middle of the block in the signal format as shown in FIG.
The signal is supplied to the Z modulation Pli 31, where other signals except the 8-bit synchronization signal are subjected to scrambled NRZ modulation by modulo-2 addition with a signal from a preset random number table (for example, an M-sequence code). After that, FM modulator 3
2. The frequency-modulated digital signal taken out from the FM modulator 32 is supplied to a known cutting machine via an output terminal 33, where it is converted into a modulated light beam, and then focused and irradiated onto the photosensitive material of the disc-shaped recording master J. be done. By passing this disc-shaped recording master through a known developing process and a disc making process, it is possible to reproduce an older disc (digital audio disc).

Note that it is of course possible to record on a recording medium other than a disk, and it is also possible to arrange the pixel data on the lower bit side of one word.

Effects of the Invention As described above, according to the present invention, a high-definition 1lii@ signal is digitally pulse-modulated and recorded on a recording medium using a component encoding method, so that high-definition color still images and partial moving images can be produced. Since it is a component encoding method, it is possible to reproduce high-definition images even in current television systems by thinning out sample points around the screen, and it is possible to reproduce high-definition images by thinning out sample points around the screen. It is possible to reproduce images of higher definition than those of discs, and the band bR
Since no compression is performed, the circuit structure can be relatively simple and inexpensive.

[Brief explanation of drawings]

1 and 2 do not show each embodiment of the signal format of the main part of the digital signal recorded by the method of the present invention, and FIG. 3 shows an embodiment of the header signal recorded by the method of the present invention. Figure 1 shows an example of the Nitsuki format A-mat, Figure 4 shows the header signal and image data recorded according to the present invention, and Figure 5 shows the image acquisition format. FIG. 6 is a block system diagram showing an example of the image formatting section; FIG. 7 is a block system diagram showing an example of the essential parts of the disk recording system; FIG. FIG. 8 is a diagram showing an example of the signal format of one block of digital signals recorded on a disc. 1.9... Header signal, 2.10... Pixel data section, 14... A/D converter, 15... Frame memory, 18.21.25... PGM processor, 19°20 .26-VTR, 22...computer, 23.
. . . Magnetic disk device, 28 . . . Digital video signal input terminal, 29 . . . Digital audio signal input terminal. Patent applicant: Victor Japan Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] Of the luminance signal and the first and second color signals that constitute a high-definition image signal that has a wider band and more scanning lines than the current standard color television signal, the luminance signal is used as the first color signal. The first and second color signals are sampled and quantized at the sampling frequency to obtain a luminance pixel data group of m bits (where m is an integer of 2 or more). means for obtaining first and second color pixel data groups each having a number of quantization bits, m bits, which are separately quantized after being sampled separately at a second sampling frequency that is 1/2 the frequency of the quantization frequency; , the luminance pixel data is placed in the first half or the second half m bits of each word, and the remaining m bits in each word where the luminance pixel data is not placed are
The first or second color pixel data is arranged in the bit,
and obtaining a multi-word pixel data section in which the first and second color pixel data are alternately arranged word by word, and a multi-word header that defines conditions for transmitting and reproducing images by the pixel data section. A digital signal generator comprising means for generating a digital signal in a signal format synthesized in time series at the leading position of the pixel data section, and means for recording the digital signal on a recording medium. Definition image signal recording method.