KR950003774Y1 - Compositive laser audio/video player installed cdg/cdeg signal reproduction circuit - Google Patents

Abstract

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Description

Compact Disc Graphics / Compact Disc Composite Laser Audio / Video Player with Extended Graphics Signal Playback Circuitry

The figure is a block circuit diagram showing a specific embodiment according to the present invention.

* Explanation of symbols for main parts of the drawings

1: disc 2: motor

3: pick up 4: servo

5: micom 6: RF signal amplifier

7,9,14: filter 8: LD video signal processing circuit

10 digital audio signal processing circuit 11 RF signal processing circuit

12: CDG / CDEG Graphic Video Signal Decoder

13: color composite signal encoder 15: analog audio signal processing circuit

16 display 17 EFM demodulator

18: sub-code processor 19: D / A data processor

S: Analog Audio Signal / Digital Audio Signal Switch

C: LD video signal and CD / CDEG signal switch

The present invention relates to a composite laser audio / video player, and more particularly, to a composite laser audio / video player provided with a CDG / CDEG signal reproduction circuit.

Currently, various kinds of software that can play audio / video using an optical disc are used. Examples thereof include laser disk (LD), compact disk video (CDV), video single disk (VSD), compact disk (CD), compact disk graphic (CD), and compact disk extenden graphic (CDEG). .

For reference, their characteristics are as follows.

TABLE 1

Types and Features of Optical Discs

However, hardware capable of reproducing such optical discs is widely used, but only one of each disc is driven for reproduction, or a combination of several types of discs of each type of disc is driven and reproduced in one device.

In addition, the existing composite audio / video player does not have a function to play CDG / CDEG in one device, so if you want to play all the data recorded on the optical disc, the existing composite audio / video player can use the CDG / CDEG device. Had to be installed separately.

Accordingly, an object of the present invention is to provide an audio / video player capable of reproducing all information on an optical disc by integrally installing a CDG / CDEG signal reproducing circuit in an existing composite laser audio / video player.

Another object of the present invention is to provide a variety of uses for education, information and entertainment (karaoke, etc.) by adding the CDG / CDEG function to the existing composite laser audio / video player.

Another object of the present invention is that it is economical because the CDG / CDEG signal reproduction circuit is simply installed in the composite laser audio / video player as compared to the complicated installation of the CDG / CDEG equipment separately in the conventional composite laser audio / video player. In addition to providing a compact, compact, complex laser audio / video player.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention is largely composed of a multi-disc player (MDP) (ADP), a CDG / CDEG signal reproducing circuit part (B), and an LD video signal and a CDG / CDEG signal switching switch part (C). .

The multi-disc player unit A is specifically, a motor 2 for driving the disc 1, and connected to the motor 2, such as a spindle, sled, loading, A servo 4 for controlling the functions of focusing, tracking and tilts; Pick-up 3 which emits laser light and reads the information recorded on the optical disc 1 to supply an RF signal to the amplifier 6, and amplifies the fine RF signal to filter each of the filters 7 and 9, respectively. An RF signal amplifier 6 for applying the LD video signal processing circuit 8, the digital audio processing circuit 10, and an analog audio signal through filtration of 14; and the RF signal output from the RF signal amplifier 6; Is converted into an 8-bit demodulation signal through the EFM demodulator 17, and digital voice data is sent to the D / A data processor 19, and CDG / CDEG graphic signals are sent to the sub-code processor 18. An RF signal processing circuit 11 for generating an 8-bit sub-code according to eight clock commands; An analog audio signal connected to the microcomputer 5 for switching the digital audio signal from the digital audio signal processing circuit 10 and the analog signal from the analog audio signal processing circuit 15 under the control of the microcomputer 5 / Digital audio signal switching switch S; A display 16 connected to the microcomputer 5 for displaying functions such as the duration of the song and the number of songs; It consists of the microcomputer 5 which controls the whole audio / video signal reproduction function.

The CDG / CDEG signal reproducing circuit (B) is connected to the RF signal processing circuit (11) of the multi-disc player unit (A) described above, and receives and processes a sub-code signal used for graphics to encode a color composite signal. A CDG / CDEG graphic video signal decoder 12 supplied to the order 13; RGB color synthesis of red (R: red), green (G: green), and blue (B: blue) of the NTG / CDG video signal received from the CDG / CDEG graphic video signal decoder 12 It is composed of a color composite signal encoder 13 which is converted into a signal and taken out to one terminal of the LD video signal and the CDG / CDEG signal switching switch C.

The LD video signal and the CDG / CDEG signal switching switch C are color composite signal encoders of the LD video signal processing circuit 8 and the CDG / CDEG signal reproducing circuit B of the multi-disc player A. (13) and the microcomputer 5, and are switched according to the switching control command of the microcomputer 5 so as to output the LD video signal or the CDG / CDEG signal on the monitor.

Hereinafter, the operation of the present invention will be described.

When the disk 1 rotates by the servo 4 and the motor 2, the light of the linearly polarized light emitted from the laser diode (not shown) of the pickup 3 is divided into three lights by a diffraction grating. Lose. The two lights on both sides are for tracking detection, and the light at the center is used for focus detection and recording signal detection. The three emitted light reading and reflecting the signal recorded on the disk 1 is converted into electrical energy in the photodiode (not shown). The pickup 3 detects exactly the signal recorded on the disk 1 by the vibration of the disk 1 surface, the focus following the eccentricity, and the tracking circuit (not shown). The servo 4, in which the pickup 3 is moved by the control of the microcomputer 5, performs forward, backward and track opening and closing operations of the disc tray. In the case of the laser disk 1, the tilt servo compensates for the inclination caused by the large disk area.

The frequency of the RF signal reading the information recorded on the disc 1 by the pickup 3 includes digital audio signals, analog audio signals and LD video signals, as shown in the spectrum of Table 2 below. .

TABLE 2

Frequency Spectrum of RF Signal

LD video signals of the RF signals are filtered through a high pass filter (7) and applied to the LD video signal processing circuit (8); The digital audio signal is filtered through the RF signal processing circuit 11 and the midpass filter 9 and then supplied to the digital audio signal processing circuit 10; The analog audio signal is filtered through the low pass filter 14 and then supplied to the analog audio signal processing circuit 5, respectively.

When the CD is reproduced, only the audio signal is extracted by the RF signal processing circuit 11; When a CDG / CDEG disc is played back, sub-codes as shown in Table 3 below are additionally drawn out. Normally, CD and CDG / CDEG discs are formed based on one frame format of 588 channel bits, which will be described in more detail as follows.

TABLE 3

Sub-code

A: synchronization signal... … … … … … … … … … … … … … … 24 channel bits

B: user signal... … … … … … … … … … … … … … … 34 × 3 channel bits

C: control and display signal... … … … … … … … 1 × 14 channel bit

D: data signal... … … … … … … … … … … … … … 24 × 14 channel bits

E: error correction signal. … … … … … … … … … … … 8 × 14 channel bits

In this example, the A, B, D, and E signals are recorded identically on the CD and CDG / CDEG discs, while the C signals (control and display signals) are not used on the CD on the CDG / CDEG disc (4). The R ... and W bits are recorded to draw the CDG / CDEG video graphics signal.

The C signal (control and display signal) is modulated and recorded into an EFM signal of 14 bits when 8 bits are first recorded on the CDG / CDEG disc 1, but during operation, the EFM demodulator 17 in the RF signal processing circuit 11 By 8 bits. The EFM demodulator 17 is a circuit for demodulating the input EFM 8-bit-14 bit modulation) signal into the original 8-bit signal. (1) When the digital audio signal is input, the EFM demodulator 17 converts the signal to the D / A data processor 19. (2) When reproducing the CDG / CDEG disc, the sub-code signal of the RW as shown in Table 3 used for the graphics recorded on the CDG / CDEG disc is sent to the sub-code processor 18.

TABLE 4

Sub-code format

In the above, P and Q are used to indicate the beginning of a song using both CD and CDG / CDEG or to indicate the number and progress of songs contained in the disc 1 appearing on the display 16, and R .. The W signal is used only for CDG / CDEG to carry video data for CDG / CDEG.

When playing a CDG / CDEG disc, the EFM assist 17 and the sub-code processor 18 which demodulate the 14 bits in the RF signal processing circuit 11 into 8 bits according to eight clock instructions of the microcomputer 5 are used. Outputs 8 bits of P, Q, R, S, T, U, V, and W sub-codes. The sub-codes of R ... W used for graphics are converted into red (R: red), green (G: green), and blue (B: blue) color signals in the video signal decoder 12. The signal is output from the color composite signal encoder 13 as a NTSC / PAL color composite signal and supplied to one terminal of the LD video signal / CDG / CDEG signal switching switch C.

Meanwhile, the high pass filter 7 receiving the RF signal amplified by the amplifier 6 filters the LD video signal in the range of about 3.5 MHz to 13.5 MHz to form an LD video signal of NTSC / PAL method. It is output to one terminal of one LD video signal and CDG / CDEG signal switching switch (C).

The LD video signal and the CDG / CDEG signal supplied to both terminals of the switch C are switched according to the switching control command of the microcomputer 5 to output the LD video signal or the CDG / CDEG signal on the monitor.

On the other hand, at the time of reproduction of the disc on which the digital audio signal is recorded, as described above, after passing through the EFM demodulator 17 and the D / A data processor 19 in the RF processing circuit 11, the mid-pass filter 9 By this, the EFM signal covering the 500MHz-2.3MHz band is extracted and supplied to the digital audio signal processing circuit 10 and then supplied to one terminal of the analog audio signal / digital audio signal switching switch S. FIG.

When playing back a disc on which an analog audio signal is recorded, the low pass filter 14 filters only the frequencies that span the 2.3 MHz to 3.5 MHz band, and the analog audio signal / digital audio signal through the analog audio signal processing circuit 15. It is output to the other terminal of the switching switch S. The two analog / digital audio signals output an analog audio signal or a digital audio signal from the switch S in accordance with a switching control command of the microcomputer 5. Also, by the control of the microcomputer 5, functions such as the duration of the song and the number of the songs are displayed on the display 16.

Although the present invention has been described with respect to specific embodiments in the above description, there may be various other embodiments and variations without departing from the spirit of the appended claims.

Claims (1)

A disk 2 driving motor 2, a pick-up 3 for reading information recorded on the disk 1, a servo 4 connected to the motor, and the pick-up 3 An amplifier 6 connected to amplify an RF signal, and a digital audio signal, an analog audio signal, and an LD video signal connected to the amplifier 6, respectively, filtered in each frequency band for the LD video signal. Filters (7) (9) (14) for supplying the processing circuit (8), the digital audio signal processing circuit (10), and the analog audio signal processing circuit (15), respectively, and the received RF signal to the EFM demodulator (17). To convert the original 8-bit demodulated signal through the digital voice data to the D / A data processor 19 and the CDG / CDEG graphics signal to the sub-code processor 18. RF signal processing circuit 11 for generating an 8-bit sub-code according to An analog audio signal / connected to the de-audio signal processing circuit 10, the analog audio processing circuit 15, and the microcomputer 5 and outputting an analog audio signal or a digital audio signal according to a switching control command of the microcomputer 5 / Digital audio signal switching switch (S), a display (16) connected to the microcomputer (5) for displaying functions such as the duration of the song and the number of songs, and a microcomputer (5) for controlling the audio / video signal reproduction function as a whole. And a multi-disc player unit A formed of; A CDG / CDEG video signal decoder 12 connected to the RF signal processing circuit 11 and outputting a video signal of a sub-code used for CDG / CDEG to the color composite signal encoder 13, and the CDG / CDEG video signal decoder 12 and connected to one terminal of switch C to convert the graphic signal of the sub-code into a composite color signal of NTSC / PAL method and output on one terminal of the switch C. A CDG / CDEG signal reproducing circuit B formed of a color composite signal encoder 13 to be used; Connected to the LD video signal processing circuit 8, the color composite signal encoder 13, and the microcomputer 5 to display an LD video signal or a CDG / CDEG signal on a monitor according to a switching control command of the microcomputer 5; A composite laser audio / video player comprising an LD video signal to be output and a CDG / CDEG signal switching switch (C).