KR0117850Y1 - A recording error protection device - Google Patents

Abstract

Disclosed is a device for preventing a recording error in a compact disk player (CDP) capable of recording and reproducing.

The recording error prevention apparatus according to the present invention records and plays back at a speed faster than the speed at which the recorded data is put on, and compares the recorded data with the reproduced data to perform rewriting in the case of a difference therebetween. This has the effect of preventing recording errors from occurring due to defects or external shocks.

Description

Record error prevention device

1 is a block diagram showing an embodiment of a recording error prevention apparatus according to the present invention.

FIG. 2 shows signals of various parts in the recording operation in the apparatus shown in FIG.

FIG. 3 shows the recording signal and the reproducing operation when no error occurs during recording in the apparatus shown in FIG.

4 shows recording signals and reproduction operations when an error occurs during recording in the apparatus shown in FIG.

5 is a view showing another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

1 ... Compact Disk (CD) 2 ... Spindle Motor

3 ... CLV control circuit 4 ... Optical head

5 ... Servo 6 ... Regenerative Amplifier

7 ... Address amplifier 8 ... Playback signal processing circuit

9 ... TOC memory 10 ... data comparison circuit

11 ... memory 12 ... recording signal processing circuit

13 ... coil driver 14 ... coil

15 ... A / D Converter 16 ... D / A Converter

17 ... System controller 18 ... Key input

19 ... Display 20 ... Data Compression

21 ... Data extension 22 ... Input terminal

23 ... Output terminal 24 ... External shock detector

The present invention relates to a compact disc capable of recording and reproducing, and more particularly, to a recording error prevention device in which a disc defect or recording prevents miswriting of data due to external shock.

The Compact Disk Player (hereinafter referred to as CDP) converts analog music signals into digital music signals and records them on an optical recording medium (CD) on a disc or reads digital music signals recorded on a CD to reproduce analog music signals. Device. The recording area of the CD is classified into a lead in area, a program area, and a lead out area.

In the lead-in area, a TOC (Table Of Content) having information such as the number of songs stored on the disc, the time and total time of each song, and the addresses of the head and index portions of each song are recorded. There are CD-MO, CD-WO, etc. capable of recording and reproducing, and the TOC is updated by recording the song at the time of recording and arranging the information of the newly recorded song and the information of the already recorded song. The program area is an area where music signals are recorded and has about 20,000 tracks. The lead-out area is a signal area indicating the end of the program, in which a lead-out signal (repetitive pulse of 2 Hz) is recorded from the program end position to an area 0.5 mm outside from the outside.

In the CDC error correction method (CIRC), the signal is scattered (interleave method) and the correction signal recorded before and after even if the length of the pit (hole having a slightly different length formed along the track) is 2-4 mm. Since the original signal can be found and corrected from the (parity signal), there are few cases where a large amount of signal detection is interfered with scratches or stains on the CD surface. However, in detecting error codes of 2-4mm, they rely on codes of very long intervals of several times before and after them, so they should be detected normally. Otherwise, it will be impossible to correct and lead to deterioration of sound quality.

In addition, in recording signals from the inner circumference to the outer circumferential direction, CDs generate more recording errors when recording on the outer circumference than at the time of crossing at the inner rim.

Therefore, in the CDP, there is a possibility that normal recording may not be possible due to defects of the disc, foreign matters or the like during recording.

An object of the present invention is to provide a recording error prevention device that can minimize the occurrence of a recording error in a compact disc player capable of recording / reproducing, which has been devised to overcome the above problems.

Recording error prevention device of the present invention for achieving the above object

A memory for storing the write data B blocked in T1 section units or for compressing the stored data by 1 / N (where N is an integer of 2 or more) on the time axis;

A write signal processing circuit for outputting a write signal modulated by the time-compressed write data BR output from the memory;

A coil and a coil driver for recording a recording signal provided from the recording signal processing circuit onto a compact disc;

An optical head for generating a reproduction signal corresponding to the time compressed recording data BR recorded on the compact disc;

A reproduction signal processing circuit for demodulating a reproduction signal provided from the optical head to generate time compressed reproduction data (BP) corresponding to the time compressed recording data;

A data comparison circuit for comparing the time compressed reproduction data BP generated through the reproduction signal processing circuit with the recording data B stored in the memory; And

If the recorded data B stored in the memory and the reproduced data BP reproduced by the reproduced signal processing device are different from each other with reference to a comparison result of the data comparison circuit, the time-compressed recorded data BR is a recorded signal processing device; And a system controller for controlling the coil to be recorded again through the coil driver.

Here, the system controller determines that a recording error has occurred in the data comparison circuit, and if it is due to a defect in the disk, the system controller controls to record the time-compressed recording data BR to the next position of the recording position where it was first recorded. It is desirable to.

In addition, the system controller determines that a recording error has occurred as a result of the determination in the data comparison circuit, and if it is caused by an external impact, it is preferable to control so that the time-compressed recording data BR is recorded again in the recording position where it was first recorded. desirable. Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the subject innovation.

1 is a block diagram showing an embodiment of a recording error prevention apparatus according to the present invention. The apparatus shown in FIG. 1 compresses and records recorded data on a time axis on a recordable / reproducible disc 1, or reproduces recorded data compressed and recorded on a time axis on a disc 1.

The apparatus shown in FIG. 1 includes a spindle motor 2 for rotating the disk 1, a constant linear velocity control circuit for controlling the spindle motor 2 to be rotated at a predetermined constant linear speed, and the disk 1 An optical head 4 for generating an electrical signal corresponding to the data recorded in the data, a servo 5 for controlling the focus and tracking servo of the optical head 4, and a reproduction for amplifying an electrical signal provided from the optical head 4 The amplifier 6, the address amplifier 7 for determining the recording / reproducing address of the disc by the signal provided from the reproducing amplifier 6, the electrical signal provided from the reproducing amplifier 6 and the address amplifier 7 And a reproduction signal processing circuit for reproducing the recorded signal by introducing the recording / reproducing address.

In addition, the memory 11 stores the recording data blocked in units of the T1 section, compresses the output data by 1 / N on the time axis, and outputs the data compressed by the EFM modulation on the time axis output from the memory 11. And a coil 14 and a coil drive 13 for recording information on the disk 1 in accordance with the recording signal provided from the recording signal processing circuit 12.

In addition, the data comparison circuit 10 for comparing the recorded data stored in the memory 11 with the reproduced data provided by the reproduced signal processing circuit 8 controls the entire system, and in particular, the comparison of the data comparing circuit 10 during the write operation. A system controller for controlling the rewriting of the recording data according to the result.

Reference numeral 15 is an analog-digital converter for converting an input analog signal into digital data, 16 is a digital / analog converter for converting playback data into an analog signal, 18 is a key input, 19 is a display, and 9 is a TOC memory. 24 is an external shock detection unit.

The attachment of the device shown in FIG. 1 will be described with reference to FIG.

Unlike the conventional compact disc player, the apparatus shown in FIG. 1 is characterized in that recording data is compressed by recording on the time axis by 1 / N than the normal recording speed.

The recording data flowing in the recording operation is compressed by 1 / N on the time axis. Recorded data compressed by 1 / N on the time axis is recorded on a compact disk rotating at a predetermined speed.

Since the recording data blocked by the T1 section is recorded by compressing 1 / N on the time axis, there is a time margin of (N-1) * T1 / N until the next incoming recording data is recorded. During this period, the data recorded by time compression can be reproduced, and the reproduced data can be compared with the recorded data.

The reproduction data reproduced from the disc 1 is compared with the recording data stored in the memory. If the comparison determines that there is an error, the write data stored in the memory is rewritten.

2A is a diagram illustrating a signal Sin flowing through the input terminal 22. The input signal Sin is formed of data strings B1-B5 which are blocked by the A / D converter 15 in units of T1 and quantized. The block quantized data strings B1-B5 are stored in the memory 11 and are recorded on the disk 1 in units of T ₂ . Where T2 = T1 / N and N is an integer of 2 or more. 2b shows recording data (BR1-BR5) time-compressed in units of T2. FIG. 2C shows data (BP1-BP5) reproduced from the disc 1 in units of T2. 2d shows a discrimination signal in the data comparison circuit 10. FIG.

In the recording operation, when a recording command is input through the key input unit 18 of FIG. 1, the system controller 17 executes an initialization operation of the entire system for recording. Accordingly, the input signal Sin through the input terminal 22 is converted into data B1 sampled by the time unit of T1 through the A / D converter 15 and stored in the memory 11.

The memory 11 compresses and stores the stored data at 1 / N on the time axis. The write signal processing circuit 12 outputs the EFM modulated write signal by the time-compressed write data BR1 through the memory 11.

On the other hand, the system controller 17 rotates the disk 1 through the CLV control circuit 3 and the spindle motor 2 at a constant linear speed, that is, at a speed corresponding to the speed of the normal playback speed, and the servo 5 and the optical. Focus and tracking are achieved through the head 4. The servo 5 is controlled so that the optical head 4 is positioned at the position where data is to be written through the reproduction amplifier 6, the address amplifier 7 and the TOC memory 9.

When the optical head 4 is in the position to be recorded, the system controller 17 transmits the EFM-modulated recording signal through the recording signal processing circuit 12 to the coil driver 13, the coil 14, and the optical head during the time T ₂ . (4) is recorded on the disc 1.

When writing to the disc 1 is completed, the system controller 17 starts the spindle motor 2, the CLV control circuit 3, the optical head 4, the servo 5, the regeneration amplifier 6 and the address amplifier 7. Control to search the head position of the recorded data BR ₁ and read it out through the optical head 4 and the reproduction amplifier 6.

The reproduction audio from the reproduction amplifier 6 is demodulated into data before being subjected to EFM modulation by the reproduction signal processing circuit 8 and transmitted to the data comparison circuit 10. The data comparison circuit 10 determines whether or not the reproduction data BP1 provided from the reproduction signal processing circuit 8 matches the recording data B1 stored in the memory 11, and generates an error signal when they differ from each other.

When no error occurs, the recording signal processing circuit 12 samples the signal Sin input through the input terminal 22 through the A / D converter 15, and the block quantized data B ₂ is stored in memory. Wait until it is stored in (11). When the recording data B2 has been stored in the memory 11, the system controller 17 records the time-compressed recording data BR2 generated in the memory 11 in the disk 1 by the same procedure as described above. Then, the recorded data B2 stored in the memory 11 is compared with the reproduced data BP2. If a write error does not occur, the write signal processing circuit 12 waits until B3 is stored in the memory 11. When the recording data B3 has been stored in the memory 11, the system controller 17 records the time-compressed recording data BR3 generated in the memory 11 in the disk 1 by the same procedure as described above. Then, the recorded data B3 is compared with the reproduced data BP3.

Here, if it is determined that there is an error, first, BR3 is rewritten to the next position after the position where BR3 was recorded and reproduced. If there is no error, it waits until B4 is stored in the memory 11.

In addition, in the error processing operation, when the external vibration is detected by the external vibration detecting device 24, the system controller 17 controls to record the recording data stored in the memory 11 again at the position where the BR3 was first recorded. do.

The reproducing operation by the configuration of FIG. 1 will be described with reference to FIG. 3 and FIG. At the time of reproduction, the operations of the data comparison circuit 10, the recording signal processing circuit 12, the coil driver 13, and the coil 14 are stopped. When a play command is input through the key input unit 18, the system controller 17 performs an initialization operation for the play operation.

First, the CLV control circuit 3 and the spindle motor 3 are controlled to rotate the disk 1 at a constant linear speed, that is, at a linear speed corresponding to the normal regeneration speed, and then through the optical head 4 and the servo 5. The focus and tracking are adjusted, and the reproduction amplifier 6 and the address amplifier 7 are used to search for the position to be reproduced.

The optical head 4 traces the track under the control of the servo 5 to generate a signal corresponding to the recorded data and to supply it to the reproduction amplifier 6. The reproducing amplifier 6 recovers the EFM modulated signal from the signal from the optical head 4 and supplies it to the reproducing signal processing circuit 8 and the address amplifier 7. The address amplifier 7 determines the address at the time of recording / reproducing and supplies it to the reproduction signal processing circuit 8. The reproduction signal processing circuit 8 demodulates the EFM modulated data, demodulates the time-compressed data, and transmits the recorded data to the memory 11, restores the TOC data from the data in the TOC area, and transfers the data to the TOC memory 9. . In the memory 11, the time-compressed reproduction data is extended on the time axis in an operation opposite to that of recording, and transferred to a digital-to-analog converter (hereinafter referred to as D / A converter).

The D / A converter 16 converts digital data input thereto into analog data and flows out as an output signal Sout through the output terminal 23. The TOC memory 9 transmits the stored TOC information to the system controller 17 or updates its contents by the system controller 17.

3 shows a recording signal and a reproducing operation when no error occurs during recording.

The reproduction signal processing circuit 8 stores therein an error in the P1 data in the memory 11. The memory performs an operation opposite to that in the write operation. That is, the data stored therein is output at a speed of 1 / N times. The read operation of the memory 11 restores the normal data DP1 and supplies it to the D / A converter 16. The D / A converter 16 converts the digital signal from the reproduction signal processing circuit 8 into an analog signal and flows it out through the output terminal 23. At the same time, P2 is read out and DP2, DP3, DP4 are sequentially reproduced and outputted after continuing the above operation.

4 shows recording signals and reproducing operations when an error occurs during recording.

The operation of reading P1 and P2, reproducing and outputting DP1 and DP2 is the same as in FIG. After reading P3, if it is confirmed that an error occurs, P3 'is re-read after searching for the position where P3' is recorded, and demodulated through the reproduction signal processing circuit 8, the memory 12, and the D / A converter 16. Output allows data to be output without disconnecting the output data.

At the same time, P4 is read out and DP4 and BP5 are reproduced and output one after another.

5 is a view showing another embodiment of the present invention. The recording error prevention apparatus according to FIG. 6 includes a data compression unit 20 and a reproduction signal processing circuit for compressing the sampled and block quantized data in the A / D converter 15 and providing them to the recording signal processing circuit 12. And a data decompression unit 21 for decompressing the crushed data through (8) and providing it to the D / A converter 16.

As described above, the recording error prevention apparatus of the present invention records and reproduces the input data at a faster speed than the normal input / output speed, and compares the recorded data with the reproduced data to perform rewriting when there is a difference. This has the effect of preventing recording errors from occurring due to scratches or external shocks of the disc.

Claims (3)

CDP (Compact Disk Player) capable of recording and playback, A memory for storing the write data B blocked in T1 section units or for compressing the stored data by 1 / N (where N is an integer of 2 or more) on the time axis; A write signal processing circuit for outputting a write signal modulated by the time-compressed write data BR output from the memory; A coil and a coil driver for recording a recording signal provided from the recording signal processing circuit onto a compact disc; An optical head for generating a reproduction signal corresponding to the time compressed recording data BR recorded on the compact disc; A reproduction signal processing circuit for demodulating a reproduction signal provided from the optical head to generate time compressed reproduction data (BP) corresponding to the time compressed recording data; A data comparison circuit for comparing the time compressed reproduction data BP generated through the reproduction signal processing circuit with the recording data B stored in the memory; And If the recorded data B stored in the memory and the reproduced data BP reproduced by the reproduced signal processing device are different from each other with reference to a comparison result of the data comparison circuit, the time-compressed recorded data BR is a recorded signal processing device; And a system controller for controlling the coil to be recorded again through the coil driver. 2. The system controller according to claim 1, wherein the system controller determines that a recording error has occurred in the data comparison circuit, and if it is caused by a defect in the disk, the next position of the recording position where the time-compressed recording data BR was first recorded. Recording error prevention device, characterized in that the control to be recorded. The apparatus of claim 2, further comprising an external vibration detecting device (24). The system controller determines that a recording error has occurred as a result of the determination in the data comparison circuit, and if it is caused by an external impact, the system controller controls the time-compressed recording data BR to be recorded again at the recording position where it was first recorded. Record error prevention device.