JPS62257672A - Information recording and reproducing method - Google Patents

Abstract

PURPOSE:To record picture information and to read it in a short period without lowering the recording capacity of sound information by recoding a signal representing a gap between a couple of adjacent information segments in the 1st information, recording the 2nd information in the gap and reproducing the 2nd information in a prescribed timing. CONSTITUTION:An address control circuit 2 stores sequentially each bit of a picture data in each address in a prescribed area of a memory 1 starting from, e.g., an address 0. Then an identification code and a picture data end signal E are arranged to the start and the end of the inter-music being the gap formed between the n-th music and the (n+1)th music respectively and a picture data V is arranged at the remaining part of the inter-music of the n-th music and the (n+1)th music. An inter-muisic detection circuit 3 outputs an inter-music detection signal when the signal level of the sound signal is a prescribed value or below, and the result is fed to the address control circuit 2, a signal synthesis circuit 7 and a control signal generating circuit 8. The picture data stored in the memory 1 is read sequentially by the inter-music detection signal and fed to the circuit 7.

Description

[Detailed Description of the Invention] 1.5 Publication 1. The present invention relates to an information recording and reproducing method, and in particular to a digital
This invention relates to a method for recording and reproducing two types of information such as audio information and video information on an audio disc.

Recently, a method has been proposed in which image information is recorded as subcodes on a digital audio disk with an outer diameter of approximately 120 mm, which is called a mushroom JJL compact disk (hereinafter abbreviated as CD). In this system, one word of data corresponding to image information is formed by the lower six bits of the eight bits forming the subcode, and 98 words are read as one unit.

Two words out of these 98 words are used as synchronization signals, and 24 words obtained by dividing the remaining 96 words into four are treated as the minimum unit of data and constitute one image processing command. The structure of these 24 words is as shown in FIG. 4, and the first word of the 24 words indicates the recording mode. The second word following the word indicating the recording mode is an instruction word indicating the type of instruction. The third and fourth words following the instruction word are Q parity which is an error correction code. The fifth and sixth words following the Q parity contain color data specifying the channel number and screen color. The channel number is any number from 0 to 15 expressed in 4 bits, exists only in 24 words of data indicating a specific command, and indicates the type of data within one unit. . The seventh and eighth words following the two words containing the channel number and color data contain location data indicating the data display position within the screen. The 15 words following the 2 words containing this location control data contain data and P parity which is an error correction code.

Recording modes include line graphics mode and T
There are two types of V graphics modes. In addition, image processing commands include, for example, commands to fill the entire screen with a certain color, and one of the screen constituent units (for example, in the case of TV graphics mode, the entire screen is divided into 18 equal parts in the vertical direction and 50 equal parts in the horizontal direction). There are commands to draw pictures using two types of colors on a total of 900 screen constituent units [FONT], and commands to move the entire screen vertically or horizontally. .

Note that one of the upper two bits of the eight bits forming the subcode contains Q data that includes time information corresponding to the track length from the beginning of the program area of the CD to a predetermined location of each information data recorded. is forming. The other of the upper two bits forms P data including inter-musical information.

As described above, in the method of recording image information as a subcode, image information can be recorded without reducing the recording capacity of audio information. However, since the subcode is recorded on the disk at a rate of 1 word/frame, it is necessary to collect data for 98 frames in order to decode one unit of information.

Therefore, the method of recording image information as a subcode has the disadvantage that it takes time to read the recorded image information.

An object of the present invention is to provide an information recording and reproducing method that can record image information without reducing the recording capacity of audio information on a digital audio disc and read the recorded image information in a short time. The goal is to provide the following.

The information recording and reproducing method according to the present invention records an identification signal indicating a gap provided between at least one pair of information pieces adjacent to each other among a plurality of information pieces forming first information, and records second information in the gap. The device is characterized in that when it is detected that the identification signal and the second information have been read during reproduction, the read second information is stored, and the stored second information is reproduced at a predetermined timing.

Embodiments of the present invention will now be described in detail with reference to FIGS. 1 to 3.

In FIG. 1, image data in a format as shown in FIG. 4 is sequentially supplied bit by bit from a microcomputer (not shown) to a memory 1 via a terminal IN+, for example. The output of the address control circuit 2 is supplied to the address input terminal of the memory 1. The address control circuit 2 stores each bit of the image data sequentially at each address within a predetermined area starting from address 0 of the memory 1, and each bit of the image data is stored in response to an inter-song detection signal to be described later. The configuration is such that address signals are generated so that the address signals are sequentially read out at a predetermined period.

On the other hand, an audio signal played from a tape on which a plurality of songs are recorded while forming a predetermined length of unrecorded band between the songs is input to the terminal IN.
2 to the inter-song detection circuit 3 and sample hold circuit 4.
is supplied to In the sample hold circuit 4, the audio signal is sampled using a sampling pulse of, for example, 44.1 KH2, and the instantaneous level of the audio signal at the time of generation of the sampling pulse is held and output. The output of this sample hold circuit 4 is the A/D (
The data is supplied to an analog/digital converter 5 and converted into digital data. This digital data is
The signal is supplied to an error detection and correction code addition circuit 6, where a code for error detection and error correction processing is added. The digital data output from the error detection and correction code addition circuit 6 is supplied to a signal synthesis circuit 7.

The song interval detection circuit 3 is configured to output a song interval detection signal when the signal level of the audio signal is below a predetermined value. The song interval detection signal is supplied to the address control circuit 2, the signal synthesis circuit 7, and the control signal generation circuit 8. The image data stored in the memory 1 is sequentially read out based on this inter-song detection signal and supplied to the signal synthesis circuit 7. The control signal generation circuit 8 is configured to generate various control signals such as an identification code signal and a subcode, and supply them to the signal synthesis circuit 7. The signal synthesis circuit 7 is configured to form and output a synthesized signal as shown in FIG. 2 based on the song interval detection signal.

In FIG. 2, an identification code I and an image data end signal @E are provided at the beginning and end of the interval between the nth and (n+1)th songs, respectively, and between the nth and (n+1)th songs.
) Image data V is arranged in the remaining portion between the songs.

The synthesized signal output from the signal synthesis circuit 7 is supplied to the modulator 9 and is converted into EFM (Eioht to rout
eenHoduation) is converted into a modulated signal.

This EFM signal is supplied to the optical modulator 10 to control the transmittance of the optical modulator 10. As a result, the laser light generated by the laser light source 11 is intensity-modulated by the optical modulator 10, and then
The light is magnified by the collimator lens 13 and converged by the converging lens 14 into a light spot with a diameter of about 0.5 μm on the recording surface of the recording disk 15, thereby exposing the photoresist and the like constituting the recording surface. On the other hand, the recording disk 15 is rotated by a motor 16 and a servo loop (not shown) at a speed that depends on the relative position of the optical spot in the radial direction of the recording disk 15, and is approximately 1.5 times per rotation in the radial direction. 6
It is transported at a rate of μm. Further, the converging lens 14 is controlled by a servo loop so as to always converge the laser beam onto the recording surface of the disk 15. Since these are not particularly necessary for the explanation, they are omitted in this figure.

A reproducing apparatus for reproducing information from a disc obtained in this manner will be explained with reference to FIG.

Disk 2 rotationally driven by spindle motor 20
The recorded information of 1 is read by the optical pickup 22. The pickup 22 includes a laser diode, an objective lens, a focus actuator, a tracking actuator, a photodetector, and the like.

The output of the pickup 22 is sent to the focus servo circuit 23.
, a tracking servo circuit 24, and a phase comparison circuit 25 including an RF amplifier. In the focus servo circuit 23, a focus error signal is generated by, for example, an astigmatism method, and a focus actuator in the pickup 22 is driven in accordance with this error signal.

As a result, the laser beam emitted from the laser diode and passed through the objective lens hits the recording surface of the disk 21 with a diameter of about 1.6 mm.
The light is focused into a μm light spot. Further, in the tracking servo circuit 24, a tracking error signal is generated by, for example, a three-beam method, and this error signal is sent to the tracking actuator in the pickup 22 and the carriage servo circuit 26. The output of the carriage servo circuit 26 is supplied to a motor M that drives a carriage (not shown) carrying the pickup 22, so that the pickup 22 is sent in the radial direction of the disk 21.

A recovered clock signal for demodulation is generated in the phase comparator circuit 25 and supplied to the spindle servo circuit 27. In the spindle servo circuit 27, a drive signal corresponding to the phase difference between the reproduced clock signal and the reference clock signal from a clock generation circuit (not shown) is generated to drive the spindle motor 20, thereby adjusting the track linear velocity of the recording disk 21. is controlled so that it remains constant. In addition, the phase comparator circuit 2
The EFM output of No. 5 is supplied to an EFM demodulation circuit 28 including a frame synchronization circuit. The demodulated output of the EFM demodulation circuit 28 is processed by the data processing circuit 29 without deinterleaving, error detection, correction, correction, etc. of the demodulated data signal.

Thereafter, the data is temporarily stored in the data memory 30, read out using a clock signal of a constant period from a clock generation circuit (not shown), and supplied to the song interval detection circuit 31 and the changeover switch circuit 32. The song interval detection circuit 31 receives an identification signal I
And the data between songs is data by the image data end signal E.
It is configured to detect that the data is being output from the data processing circuit 29 and output a song interval detection signal.

The output of this song interval detection circuit 31 is transmitted to the changeover switch circuit 32.
It is the control input for The changeover switch circuit 32 supplies the input to the decoder 33 when the song interval detection signal is present, and supplies the input to the D/A converter 34 when the song interval detection signal is not present.
It is configured to supply D/A converter 34
The data supplied to t is converted into an analog signal and t,
The signals are supplied to output terminals 0UT1 and 0UT2 as left and right audio signals via PFs (low-pass filters) 35 and 36. Further, when data is supplied to the decoder 33, the image data is decoded to generate pixel data indicating the color, etc. of each pixel forming the image, and is stored at an address corresponding to each pixel in the data memory 37.

Thereafter, the pixel data is read out using a constant cycle clock signal from a clock generation circuit (not shown), is supplied to the interface circuit 38, and is converted into a video signal. This video signal is supplied to the output terminal 0UT3.

In the above embodiment, the identification signal I and the image data end signal E are placed at the beginning and end of the gap, but the identification signal I and the image data end signal E are placed immediately before and after the gap. Good too. In addition, second information consisting of a plurality of information pieces is arranged in one gap, and a separately determined identification code is inserted between each information piece, and the identification code is used as a clue and the subcode signal in the disc is used to control the timing at any timing. It is also possible to sequentially read out and reproduce a plurality of pieces of information forming the second information.

1. As detailed above, the information recording and reproducing method according to the present invention includes an identification signal indicating a gap provided between at least one pair of mutually adjacent information pieces among a plurality of information pieces forming the first information. At the same time, second information is recorded in the gap, and when it is detected that the identification signal and the second information have been read during playback, the read second information is stored, and the stored second information is recorded at a predetermined timing. Since the digital audio disc is played back, image information can be recorded without reducing the recording capacity of audio information on the digital audio disc, and the recorded image information can be read in a short time, allowing high-speed processing of image information. It becomes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an information recording device according to the present invention, FIG. 2 is a diagram showing the structure of a composite signal obtained in the device shown in FIG. 1, and FIG. 3 is a block diagram showing an information reproducing device according to the present invention. The block diagram, FIG. 4, is a diagram showing the format of image data.

Claims (1)

[Claims] An information recording and reproducing method for recording and reproducing first information consisting of a plurality of information pieces on a recording disk with a gap provided between at least one pair of adjacent information pieces, the method further comprising: recording an identification signal indicating the gap; Recording second information in the gap, storing the read second information when it is detected that the identification signal and the second information have been read during reproduction, and storing the stored second information in a predetermined manner. An information recording and reproducing method characterized by reproducing at timing.