JPS5990482A - Information recording medium reproducer - Google Patents

Abstract

PURPOSE:To decrease the capacity of a field memory storing a picture element data of a color difference signal by writing a picture element data of two kinds of color difference signals in zig-zag form at the interval of several picture elements and reading out alternately the two kinds of the color difference signals at each line at the field reproduction. CONSTITUTION:A signal recorded on a disc 1 is reproduced by a pickup at a pickup circuit 2 as the change in the optical intensity or change in the static capacity. The reproducing signal extracted from the pickup circuit 2 is FM-modulated by an FM modulator 3 and applied to a decoder 4. The decoder 4 DA- converts a digital audio signal into an analog audio signal to an output terminal 5 and outputs a digital video signal to a luminance signal field memory 6 and a color difference signal field memory 7. The luminance signal picture element data of the digital video signal from the decoder 4 is selected and written in the memory 6 by a write control signal from a memory controller 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording medium reproducing device, and more particularly, pixel data of two types of color difference signals are written in a memory in a zigzag pattern every few pixels, and two types of pixel data are written alternately for each line during field reproduction. It is an object of the present invention to provide a reproducing device which can read out color difference signals and in particular can reduce the size of a field memory for storing pixel data of the color difference signals.

The present applicant previously applied for a patent application dated October 4, 1982 entitled "Information Recording Disk and Reproducing Apparatus Therefor", in which the screen image data of pixel data obtained by digital pulse modulation of one frame's worth of analog video signal. We proposed an information recording disk in which a total of one field's worth of pixel data arranged in a checkered pattern was recorded chronologically on a spiral track.

When playing back with a device equipped with only field memory as memory, only the data of even (or odd) lines (for one field) of the pixel data of the reproduced image for one frame is transmitted. This resulted in poor vertical resolution, so this was done to eliminate this drawback.That is, as shown in Figure 1, 11
4 x 4 luminance signals or 114 color difference signals (,
(RY)or11zN)'! (B-Y)) and 572 pixels in the vertical direction make up one frame, each pixel on an even line and an odd line is arranged in a checkered pattern (
The vertical resolution is improved compared to the above-mentioned conventional method.

The present invention is based on a disc (substantially In particular, when reproducing a video (in which about one frame's worth of information is recorded), the capacity of the memory that stores the pixel data of the color difference signal is increased, and the capacity of each memory that stores all the pixel data for one frame is particularly important. It is structured so that only one number is required.

Is Fig. 2 a block diagram of an embodiment of the device of the present invention? show. In the same figure, a single disc contains, for example, a digital audio signal obtained by converting an audio signal into a digital pulse, and a digital pulse modulation signal, which is a still image signal for one screen, as additional information for listening to the reproduced sound of the audio signal. After each digital video signal is frequency modulated, it is recorded as a continuous pit string on the same track. As mentioned above, the digital video government uses a luminance signal consisting of pixel data arranged in a checkerboard pattern of 114 x 4 pieces in the scanning line direction and 572 pieces in the vertical direction, 114 pieces in the scanning line direction and 572 pieces in the vertical direction. A color difference signal (RY
), CB-Y) are recorded in five sequential chronological order.

The signal recorded on disk 1 is sent to pickup circuit 2.
Due to the conventionally known light intensity change or capacitance 11
Pickup is played as a change.

The reproduction government who took out the pickup circuit 2 is FM
The signal is FM demodulated by the demodulator 3 and then supplied to the decoder 4. After correcting errors in the reproduced digital signal, the decoder 4 converts the digital audio signal from analog to analog and outputs it to the output terminal 5 as an analog audio signal. Output to 7.

The nine-degree signal pixel data of the digital video transmission from the decoder 4 is selected and written into the memory 6 by the input control signal from the memory controller 8. q v (m
The selection of the code is performed by detecting the code signal recorded in the header part of the video signal from the decoder 4.

explanation? For simplicity, configure 1 screen as 114X
As shown in FIG. 3(5), the pixel group of the luminance signal in 4 columns and 572 rows is represented by 32 pixels Y to Y52 in 8 columns horizontally and 8 rows vertically. The same figure (at the time, memory 8 is
No. 1 in the field. Each pixel of the second line is Y4.
Y5. Y2. Y6. ..., 3rd. Each pixel of the fourth line pixel Y9' Y1! i' 1°, Y, 4.
..., each pixel of the 5th and 6th line is pixel Y, YY17
21 wins 1B p Y22. ..., each pixel Y2 of the T-th and 8th lines
5゜Y Y Y,... in the order of 29''26'5Q in the second field.
,. .

Y6. ..., 5th. Each pixel of the fourth line is pixel Y, 7
゜YY, Y, ..., 1st. Each stroke of the 6th line 15'1
814 Basic? 25 pixels each in the order of pixel Y, YYY, ...
H'26' 22 η'' is loaded into a predetermined address.

In this case, since each pixel data of the luminance signal is transmitted in a checkered pattern for i frames, the memory capacity of the memory 6 is 32
The digital video signal (luminance signal) written in the memory 6 in this way for all one frame is processed by the readout control device of the memory controller 8, and the pixels that were not written in the memory 6 are It is read out by embedding the part.

As shown in Figure 3 (B) K, the pixel data of the first field and the pixel data of the second field are read out so that they are alternately arranged on one line for both even and odd lines. be done.

The sample information of each pixel read from the memory 6 is
The signal is supplied to a converter 9, where it is DA-converted into an analog video signal (luminance signal), and is supplied to an encoder 10.

On the other hand, the color difference signal pixel data of the digital video signal from the decoder 4 is selected and written into the memory T by the write control M'' from the memory controller 8. Bidet No. 1 No. 1 -・
This is done by detecting the code double length recorded in the ladder section.

To simplify the explanation of the color difference, there are 114 columns and 572 rows of color difference that make up one screen. - (RY) pixel group is shown in Figure 4 (AIK, color difference signal (B-Y) pixel group in the same figure), 32 pixels arranged in 8 horizontal columns and 8 vertical columns.
pixel R-R, B-B 1 32
1 32. The same figure (A) K color difference signal (RY) and the same figure CB) K color difference signal (R-Y)
When B-Y) is rewritten as a so-called crane sequential color difference pattern arranged alternately for each line, it becomes as shown in FIG. 1(0).

Here, regarding the color difference signal (RY) in the memory 7,
In the first field, as shown in FIG. 5 (5), the pixels RR and RR1' 15 shown in FIG.
2' 14 Ri... RRR...
RR, R, 17'29'18'
31 20 52 In the second field, as shown in FIG. 5(A), the pixels R, RRR1713'18'14' . 1 33
'29 Glue 34 Controlled.

Similarly, regarding the color difference signal (B-Y), in the first field, as shown in 5th
Pixels B B , B B . . . shown in CJ)
B1'132 warehouse 14"17 9 BB ... BB, B, 2nd fill 29'
18'#51' 20
In the case of 32-LD, as shown in No. 5 (B), the pixels B, BB B17 shown in FIG. 4 (C') K are substantially
13'1B'14' 9B
Control SR so that B B,... are written respectively.
'29'54 It is controlled.

In this case, writing of each pixel of the color difference signals (R-Y) and (B-Y) is performed every other line in the pixel group shown in FIG. 4 (0), so the memory capacity is for 16 pixels. Often, all pixels of one frame are memorized, but the color difference signals written in the memory 7 are read out by embedding the pixel portions that were not written in the memory 7 according to the readout control signal of the memory controller 8. be done. Regarding the color difference signal (R-Y), the first field is as shown in FIG. 6, and the first field as shown in FIG. 5 (5). Pixels on the third line R1゜R, R...3 sets, twice for each line, 13th 2p 5, pixels R, R, R,... on the seventh line as a set 17
29 1B are read out in a manner that they are arranged twice per line, and in the second field, as shown in FIG. 7, the 5th. 3rd line picture R,... is grouped as 1. 2 element R17'15/18 degrees per line, 9th. Pixels R, R5329', R34, .

On the other hand, regarding the color difference signal (B-Y), as shown in FIG. 6 in the first field, the second and fourth fields shown in FIG.
Pixel BB of the line..., 6th. 41st 1!
5 line pixels B, B, B..., 6j-th 8th U17 13 Pixels B, BB,... of 2 lines are set as a line 17
299 18 The 6th field shown in FIG. Pixel B on the fourth line, B17 13
"B, 10th.: Pixel B, B18 of the 8th line

55 29"B34. . . . They are read out so that they are arranged repeatedly twice for each line.

The sample information of each pixel read from the memory T is supplied to the DA converter 12, where it is DA-converted into an analog video signal (color difference signal) and supplied to the encoder IQK. The encoder 1o combines the analog luminance signal from the DA converter 9 and the analog color difference signal from the DA converter 12, adds horizontal and vertical synchronization signals, and a color burst signal, and converts it into a standard television signal. After that, the image is taken out from the output terminal 11 and reproduced and displayed as a still image. - Note that if you select pixels for luminance signals every other line like you do for color difference signals, the vertical resolution will deteriorate.
Regarding the luminance signal, pixel selection is performed for each line.

As described above, the information recording medium reproducing apparatus according to the present invention includes 1
A digital pulse that is an analog video signal for one frame'
An information recording medium in which pixel data of a luminance signal and two types of color difference signals for a total of one field arranged in a checkered pattern on a screen among pixel data obtained by modulation are recorded in a time series on a spiral track. Regenerate 2-) to l(γ and reproduce 2
Each pixel data of the color difference signal of the species? Each pixel is sequentially written to the field memory in a zigzag pattern every few pixels, and among the pixel data stored in the field memory, each pixel data of the color difference signal of the 2 heel is written to the line m with the color difference signal of the second heel during cuff field reproduction. Alternate reading is repeated in field period units, and the pixel data read from the field memory is A-converted and then converted to a standard television format and output, so each pixel data of a different color difference signal is is written to the memory in a zigzag pattern every few pixels, so data of one color difference signal can be written every few lines, which reduces the memory capacity by storing all the pixel data for one frame. It has the advantage of being small in number and can be constructed at low cost.

[Brief explanation of the drawing]

FIG. 1 shows the location of the pixels transmitted from the information recording disk reproduced by the device of the present invention on the screen. 2 is a block system diagram of an embodiment of the device of the present invention, and FIG. 3 (A),
(B) is a diagram schematically showing the display position in the screen of the pixel data of the luminance signal written in the field memo [11] of the device of the present invention and the luminance signal read out from the field memory, respectively, FIG. (5), ■) are the color difference signals (R-Y) and (
A diagram schematically showing the display position of the pixel data of B-Y) in the screen, and the figure <ay is a diagram schematically showing the display position in the screen to explain the arrangement of pixel data of line-sequential color difference signal. figure,
5(A) and CB) show the display positions within the screen of color difference signal (RY) pixel data and color difference signal (B-Y) pixel data selected and written into the field memory of the device of the present invention, respectively. FIGS. 6 and 7 schematically show the display position within the screen of each pixel data of the first field and the second field read from the field memory of the device of the present invention, respectively. It is a figure shown typically. 1...Disk, 4...Decoder, 6, 7...Field memory, 8...Memory controller, 9
．． 12...DA converter, 10...encoder, 11
...Analog video reliability output terminal 0 Continuation of page 1 0 Author: Koji Tanaka, 3-12 Moriya-cho, Kanayō-ku, Yokohama, Japan Victor Co., Ltd. Author: Yoshiaki Amano, Moriya-cho, Kanayō-ku, Yokohama 3-12 Japan Victor Co., Ltd.

Claims (1)

[Claims] Of the pixel data obtained by digital pulse modulation of the analog video signal for one frame, a total of one field worth of pixel data of the luminance signal and two solid color signals arranged in a checkered pattern on the screen is When reproducing a news recording medium recorded on a spiral track in chronological order, each pixel data of the two reproduced color difference signals is sequentially stored in a field memory in a zigzag pattern every few pixels. writing, and alternately reading out each pixel data of the two types of color difference signals line by line with different color difference signals when reproducing one field among the pixel data written in the field memory is repeated for each field period; An information recording medium reproducing apparatus characterized in that the pixel data successively output from the field memory is converted from digital to analog and then converted into a television signal of a standard television system and outputted.