KR930001364B1 - Compact disk - Google Patents

Abstract

The apparatus copies the voice signal and the control data of a read- only compact disk on a writable compact disk. The apparatus comprises a reproducing section (100) for reproducing the information of the read-only compact disk, a copying section (200) for copying the information of the read-only CD on the writable CD, a PLL section (300) for providing the synchronous bit clock to the reproducing section and the copying section, and a variable speed controller (400) for providing the power to the copying section in response to the selected frequency.

Description

Variable speed copying apparatus for compact discs

1 is a block diagram of the present invention.

2 is a concrete circuit diagram according to FIG.

3 is a timing diagram of the laser modulator 29 according to FIG.

* Explanation of symbols for main parts of the drawings

100: playback unit 200: recording unit

300: PLL unit 400: variable speed control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying apparatus of a compact disk, and more particularly, to a variable speed copying apparatus of a compact disk capable of copying voice signals and control data on a compact disk for reproduction only at variable speeds on a recordable compact disk. will be.

In general, a compact disc refers to a disc in which information is recorded in the form of a pit by digitally converting a voice signal, and a modulation method of a signal embedded in the disc is EFM modulation (Eight to Fourteen Modulation). The error correction method uses a CIRC (Cross Interleave Reed-Solomon Code). The information recorded on the compact disc is picked up and reproduced by a compact disk player having an optical pickup device.

The general compact disc player can only play back the recorded information of the compact disc provided from the compact disc maker as a play-only player. Herein, the information refers to voice signals and control data. Therefore, the user of the compact disc player could not copy the audio signals and the control data on the compact disc dedicated to reproduction to another recordable compact disc. The reason why the above disc player could not copy the information in the playback-only compact disc to the recordable compact disc is as follows.

First of all, the compact disc is manufactured by a compression mold, an injection mold, a photo polymarization method, and the like, by forming a number of compact discs using a single stamper. This is almost similar to the existing LP record. In recent years, as the material of compact discs has been newly developed and the recording technology of data using semiconductor lasers has been developed, write once type that can be recorded only once, erasable type that can be recorded and played back many times, etc. Was developed, but the same pit clock as the pit clock of the playback-only compact disc could not be generated on the recordable compact disc, and a wobble mark corresponding to the track address of the playback-only compact disc on the recordable compact disc ( Wobble Mark couldn't be formatted in advance.

Accordingly, an object of the present invention is to provide an apparatus capable of copying a voice signal and control data on a compact disk for reproduction only on a recordable compact disk in view of the above problems.

Another object of the present invention is to provide a variable speed copying apparatus of a compact disk capable of copying a voice signal and control data on a compact disk for reproduction only at variable speeds.

The present invention for achieving the above object is characterized by providing a variable speed control unit for recording the voice signal and control data on a recordable compact disk at variable speed.

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

FIG. 1 is a block diagram according to the present invention for reproducing a reproduction unit 100 for reproducing compact disc information for reproduction only, and copying information on a reproduction-only compact disc of the reproduction unit 100 onto the recordable compact disc. The recording unit 200 and the detection output signal of the reproduction unit 100 are input to apply a phase locked bit clock to the reproduction unit 100 and to the recording unit 200 to output a modulation clock. A variable speed control unit 400 for outputting the selected double speed frequency among the PLL unit 300 and the maximum variable frequency input to the reproducing unit 100 and applying power to the recording unit 200 according to the selected double speed frequency. It is composed of

FIG. 2 is a detailed circuit diagram of FIG. 1 according to the present invention, wherein the reproducing section 100 has a first disc 11 dedicated for reproduction, in which information is recorded, and a laser on the first disc 12 under predetermined control. A first optical pickup unit 14 for picking up recording information recorded by irradiating the light, a first sled motor 15 for horizontally moving the first optical pickup unit 14 by a predetermined control, and the first optical pickup unit 14. A laser power control unit 16 connected to the first optical pickup unit 14 to keep the laser generation constant in the first optical pickup unit 14, and information picked up and connected to the first optical pickup unit 14 A first preamplifier 17 for preamplifying and a focusing servo signal and a tracking servo signal according to an alarm picked up and connected to an output terminal of the first preamplifier 17 detect the first optical pickup unit 14. Is connected to the first focusing / tracking servo 18 and the preamplifier 17. A frame sync detector for detecting frame sync from the waveform-shaped EFM signal connected to an EFM waveform shaper 19 for outputting the pick-up-amplified RF signal to an EFM signal and outputting the waveform. CLV servo controller 5, which is connected to an output terminal of the frame sync detector 10, compares the frame synchronization signal with an input pulse, and outputs a linear speed control signal, and the CLV servo controller 5 The first spindle drive 13 for driving the first spindle motor by inputting the output of the first spindle motor and the first spindle motor for rotating the first disk 11 according to the driving signal of the first motor drive 13. It consists of 12 pieces.

The recording unit 200 includes a recordable second disk 21, a second spindle motor 22 for rotating the second disk 21, the second spindle motor 22, and the playback unit 100. A second motor drive 23 connected between the CLV servo controllers 5 in the upper part and a second motor drive 23 for driving the second spindle motor 22; A recordable second optical pickup unit 24 which inputs and records information on the first disc 11 on the second disc 21, and picks up and outputs track information of the second disc 21; A second sled motor 25 for horizontally moving the second optical pickup unit 24 by a predetermined control and a second optical pickup unit 24 for preamplifying the picked-up RF signal. Laser light modulation of the EFM shaping signal, which is connected to the preamplifier 27 and the output terminal of the EFM waveform shaping device 19, The second optical pickup unit 24 is connected between the laser modulator 29, an output terminal of the laser modulator 29, and the second optical pickup unit 24 to constantly control the optically modulated signal and power. A second focusing / connecting device connected to the laser power control unit 26 and the second preamplifier 27 to detect a focusing servo signal and a tracking servo signal and feed back to the second optical pickup unit 24. It consists of a tracking servo 28.

The PLL unit 300 is connected to an output terminal of the frame sync detector 10 in the playback unit 100, and is connected to an output terminal of the phase detector 31 and a phase detector 31 for phase comparison detection. A VCO 33 connected to an output terminal of the LPF 32 for outputting the oscillation output by voltage control to the laser modulator 29 of the recording unit 200, and the VCO 30. It is connected to the output terminal of the VCO (30) is input to generate a reference frequency to generate a feedback frequency to the phase detector 31 is composed of 1 / E (34).

The variable speed control unit 400 inputs a variable double speed maximum frequency to the input terminal 1H to output a plurality of divided double frequency frequencies, and inputs an output of the divider 42 to output one A switching unit 43 for selectively outputting only a frequency and a control signal according to a user's selection connected to the switching unit 43 to select and designate an output of the switching unit 43 to the recording unit 200. The microcomputer 41 applies a laser power according to the selected double speed frequency.

3 is a timing diagram of the laser modulator 29 according to FIG. 2, in which FIG. 3a is an output of the EFM waveform shaper 19, and in FIG. 3b, the EFM signal of FIG. Modulated output waveform.

Hereinafter, an embodiment of the operation will be described in detail with reference to FIGS. 1 through 3 according to the above-described configuration. First, the first disc 11 and the recording unit 200 in the playback unit 100 will be described. Since the linear velocities of the second discs 21 in the inside must be the same, the output of the CLV servo controller 5 in the reproducing unit 100 is simultaneously supplied to the first motor drive 13 and the second motor drive 23. Supplied.

In FIG. 2, the variable speed maximum frequency is input to the input terminal 1H of the variable speed control unit 400. The variable speed maximum frequency is a frequency that can be copied at the maximum speed to the compact disc copying apparatus. That is, for example, assuming that the standard frequency for copying at 1x speed is 7.35 Hz, the variable frequency maximum frequency is input to Nx 7.35 Hz. Where N is the maximum double speed constant. Also, the N × 7.35 GHz may be provided from an external clock generator (not shown).

Accordingly, the variable double speed maximum frequency is input to the divider 42 and dividedly output. In other words, the divider 42 inputs the variable frequency maximum frequency and outputs a frequency capable of copying from the 1x speed to the Nx speed. For example, when N × 7.35㎑ is dispensed with N, it becomes single speed, when 1 / 2N is dispensed, it becomes double speed, when 1 / 3N is dispensed, it becomes triple speed, when 1 / 4N is dispensed, it becomes 4 times speed and 1 / 100N is dispensed. 100 times faster. However, it is true that infinite speed here is impossible due to the mechanical nature of the system. Subsequently, each output terminal of the divider 42 is input to the input terminals a1-an of the switching unit 43, respectively.

Only one output of the switching unit 43 is output according to the selection control signal of the microcomputer 41. If the user wants to record on the second disk 21 at a single speed, the microcomputer 41 In this case, if the input terminal a1 of the switching unit 43 is N-divided input, the output of the switching unit 43 is 7.35 when the input of the input terminal a1 is selected and designated. The standard frequency of kHz is input to the CLV servo controller 5.

Therefore, the CLV servo controller 5 supplies the output of the single speed frequency to the motor drive 23, so that the single speed radiation is made. In this case, if the user wants to copy at the Nx speed, the output of the switching unit 43 selects the output of the input terminal (an), so the Nx copying is made.

In addition, the CLV servo controller 5 inputs the output of the frame sync detector 10 of the playback unit 100. This is to output a constant linear velocity control signal by comparing the frame synchronizing signal and the input N times frequency (pulse) among the information read by the first disc 11.

On the other hand, the output of the VCO 33 of the PLL unit 300 is input to the laser modulator 29 of the recording unit 200, the laser modulator 29 is the output of the EFM waveform shaper 19 and the VCO ( Inputting the output of 33) generates a laser light modulated output and outputs it to the second laser power controller 26.

In addition, the first laser power control unit 16 maintains the regenerative laser power constant, and the second laser power control unit 26 controls the EFM data to be recorded and the bit rate (N × 4.3218 MHz at N times speed). The information is recorded on the second disk 21 as a modulated signal. The microcomputer 41 provides power for selection.

That is, the power is determined according to the material of the disk and the rotational speed of the disk. For example, during recording, the recording power may be selectively provided between 4 mW-10 mW and kept constant.

Meanwhile, the size of the pit formed on the second disk is closely related to the rotational speed of the disk, the size of the laser power, and the pulse duty modulated by the laser modulator 29. Here, each component of the reproducing unit 100, the recording unit 200, and the PLL unit 300 has the same function as the above-described configuration, and thus a detailed description thereof is omitted.

The waveform diagram of FIG. 3A is the output of the EFM waveform shaper 19, and FIG. 3B is the modulated output of the laser modulator 29. FIG. Here, the modulated output waveform of FIG. 3b is applied to the laser power controller 26.

As described above, the present invention is provided on a compact disc capable of recording audio signals and control data on a reproduction-only compact disc by including a variable speed control unit for outputting a variable speed maximum frequency to a reproduction unit and applying power to the recording unit according to the selected double speed frequency. The advantage is that you can copy at variable speed.

Claims (3)

A reproducing unit 100 for reproducing compact disc information for reproduction only, a recording unit 200 for copying information on a reproducing compact disc of the reproducing unit 100 onto the recordable compact disc, and the reproducing unit A compact having a PLL unit 300 for inputting a detection output signal of (100) to apply a phase locked bit clock to the reproducing unit 100 and to the recording unit 200 to output a modulation clock. In the copying apparatus of the disc, the variable speed control unit 400 for outputting the selected double speed frequency among the maximum variable speed input to the playback unit 100 and applying power to the recording unit 200 according to the selected double speed frequency Variable speed copying apparatus of a compact disc, characterized in that consisting of. The frequency divider 42 of claim 1, wherein the variable speed control unit 400 inputs the maximum variable frequency to the input terminal 1H and outputs a plurality of divided speeds. A switching unit 43 for selecting and outputting only one frequency by inputting an output, and connected to the switching unit 43 to input a control signal according to a user's selection to select and specify an output of the switching unit 43 And a microcom (41) for applying a laser power according to the selected double speed frequency to the recording unit (200). 3. The variable speed copying apparatus of a compact disc according to claim 2, wherein the frequency divider (42) inputs the variable frequency maximum frequency and divides the frequency from one speed frequency to the variable frequency maximum frequency by an integer multiple.