KR100360406B1 - Digital signal processing apparatus for reproducing optical disc data and optical disc player having the same - Google Patents

Abstract

The present invention relates to an optical disc player for reproducing a signal recorded on an optical disc, comprising: a data generator for generating output data by performing demodulation and error correction on an input digital signal read out from the optical disc; A memory unit for temporarily storing the output data in a predetermined unit; A signal processor that reads the output data from the memory unit and outputs the confirmation signal in parallel in response to a predetermined request signal; And an output unit for outputting the request signal to the signal processing unit, receiving the output data in parallel with the confirmation signal from the signal processing unit, processing the data according to the type of optical disc, and generating output data. In the transmission of digital signal processing data from the digital signal processing unit to the output unit, the parallel processing is performed with the request / confirmation signal instead of the one-bit serial transmission. The data processing at the output unit is easy, and the possibility of error is reduced.

Description

Digital signal processing apparatus for reproducing optical disc data and optical disc player having the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc player for reproducing a signal recorded on an optical disc. More particularly, the present invention relates to a digital signal processing apparatus for controlling a digital signal read out from an optical disc, regardless of the type of disc, and an optical disc player having the same. .

A compact disc (CD), which is a kind of optical disc, can store a large amount of information and is widely used as a storage medium for information. The audio disc stores a stereo audio signal consisting of two 16-bit data words sampled at 44.1 MHz. Therefore, the player outputs audio data at a rate of 1.41x10 ⁶ bits / second. There is also a need for data for error correction, synchronization and modulation. The channel bit rate, which reads data from the disk, is 4.3218 Mbps. Types of compact discs (CD) include not only CD-Audio (CD-Audio or CD-DA) in which audio data is recorded, but also CD-ROM in which data or video signals are stored, CD-I interactively recorded in multimedia information, And Video CDs.

An optical disc player for reproducing information stored in the above optical disc is generally composed of a plurality of hardware blocks. The blocks constituting the optical disc player can be broadly divided into an analog signal processing unit, a servo unit, a digital signal processing unit, and an output unit. The analog signal extracted from the optical disc is amplified and noise canceled by the analog signal processor, and demodulated, de-interleaving, and error correction are performed by the digital signal processor. The data passed through the above process is delivered to the output unit, and finally delivered to the user. The output unit may perform CD-ROM decoding, digital to analog data conversion, and the like. The servo unit controls the position of the optical disc from which the signal is to be extracted.

However, the output data of the digital signal processing unit is transmitted in serial units to the output unit in bits. The digital signal processing unit becomes a master of data transmission, and the output unit becomes a slave to unilaterally transmit data. Therefore, there is a high possibility that an error occurs due to factors such as a problem in memory control of the output unit.

SUMMARY OF THE INVENTION The present invention provides a digital signal processing apparatus and method for solving a memory control problem on an output side by transmitting a demodulated optical disc digital signal to an output side in an optical disc player for reproducing a signal recorded on an optical disc. To provide.

Another object of the present invention is to provide an optical disc player having the above digital signal processing apparatus.

1 is a view showing an optical disk player according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a memory for processing digital signals in the optical disc player of FIG. 1.

3 is a waveform diagram of major signals in the optical disc player of FIG.

FIG. 4 is a flowchart showing a flow in which main signals are processed in the optical disc player of FIG. 1.

5 shows a map structure of the digital signal processing memory 15 considering not only main data but also subcode data.

6 shows a frame data structure before EFM modulation in a CD.

7 shows a data structure of a CD subcode block.

8 shows the data format of a CD-ROM.

The digital signal processing apparatus of the optical disk player according to the present invention for achieving the above technical problem,

A data generator which receives an analog signal read from an optical disc and converts the signal into a digital signal, and performs output demodulation and error correction on the input digital signal to generate output data; A memory unit for temporarily storing the output data in a predetermined unit; A signal processor that reads the output data from the memory unit and outputs the confirmation signal in parallel in response to a predetermined request signal; And an output unit for outputting the request signal to the signal processing unit, receiving the output data in parallel with the confirmation signal from the signal processing unit, processing the data according to the type of optical disc, and generating output data. The memory unit may include a first memory area configured to store data demodulated by the input digital signal; A second memory area for error correction of the demodulated data; And a third memory area for receiving the error-corrected data and storing the data in a predetermined block unit size, so that the data stored in the third memory area is output in parallel units by the signal processor.

According to another aspect of the present invention, there is provided a digital signal processing apparatus for an optical disc player.

A data generator which receives a signal obtained by converting an analog signal read from an optical disc into a digital signal, performs demodulation and error correction on the input digital signal, and generates output main data and subcode data; A memory unit for temporarily storing the main data and subcode data corresponding thereto in predetermined units; A signal processor for outputting a confirmation signal while reading the main data and corresponding subcode data from the memory unit in parallel in response to a predetermined request signal; And an output unit configured to output the request signal to the signal processor to receive the main data and corresponding subcode data in parallel with the confirmation signal from the signal processor, and to process the main data based on the subcode. The memory unit may include: a first memory area configured to store main data demodulated by the input digital signal and subcode data corresponding thereto; A second memory area for error correction of the demodulated main data; And a third memory area for receiving the error-corrected main data and subcode data corresponding thereto and storing the error-corrected main data and corresponding subcode data in a predetermined block unit size. The main data and subcode stored in the third memory area by the signal processor It is preferable that data is output in parallel units.

The optical disk player according to the present invention for achieving the above technical problem,

An analog signal processor for receiving the analog signal extracted from the optical disc and outputting preliminary signal processing data; Receive the preliminary signal processing data, perform predetermined digital signal processing to generate digital signal processing data and store it in a memory area, and read and store data of a predetermined size stored in the memory area in response to a predetermined request signal. A digital signal processor for outputting a confirmation signal together with the output; And an output unit for outputting the request signal to the digital signal processing unit, receiving the digital signal processing data in parallel, performing a decoding process according to the type of disc, and outputting the digital signal to the terminal device. The processor may include a first memory area configured to store data demodulated by the preliminary signal processing data; A second memory area for error correction of the demodulated data; And a third memory area for receiving the error corrected data and storing the data in a predetermined block unit size, and outputting the data stored in the third memory area in parallel units.

The digital signal processing method of the optical disk player according to the present invention for achieving the above technical problem,

Receiving the analog signal extracted from the optical disc and outputting preliminary signal processing data; Receiving the preliminary signal processing data and performing digital signal processing to generate digital signal processing data; Requesting data output according to a request signal; In response to the request signal, reading the digital signal processing data in units of a predetermined size and outputting the confirmation signal together in parallel; And receiving the digital signal processing data in parallel and performing a decoding process according to the type of the disc. The data output in parallel in the outputting step is generated from the digital signal processing data. The main data for output, subcode data corresponding thereto, and correction flag data according to error correction of the main data may be included.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an optical disk player according to an embodiment of the present invention. Referring to this, the optical disc player according to the preferred embodiment includes an analog signal processor 12, a digital signal processor 14 and an output unit 16.

The analog signal processor 12 amplifies the analog signal extracted from the optical disc DISC, removes noise, and outputs the preliminary signal processing data PSPD. Preferably, the optical disc player further includes a servo unit 18 for controlling the exact position of the signal to be extracted from the optical disc DISC. The digital signal processor 14 receives the preliminary signal processing data PSPD and performs predetermined digital signal processing such as demodulation, de-interleaving and error correction. The digital signal processed data is output as digital signal processing data DSPD.

In a compact disc, data is modulated in an EFM manner and recorded in the form of pits, and an optical pickup is used to reproduce the data in a player. Channel bit data, which is data encoded and recorded on a disk, is subjected to Cross-Interleave Reed Solomon Code (CIRC) error correction coding and EFM modulation, and includes subcodes and synchronization words. The data on the compact disc is formatted in units of frames. A frame refers to the smallest unit of recognizable data on a disc, which makes it possible to distinguish between audio data and its parity, synchronization words and subcodes. The frame structure before EFM modulation is shown in FIG. All necessary data is recorded in the frame format during encoding, and after encoding and modulation, it becomes a bit stream of a frame of 588 channel bits. Each frame includes one subcode symbol (8 bits, P, Q, R, S, T, U, V, and W).

The disc player plays data such as demodulation, error correction, filtering, and digital-to-analog conversion. In the optical pickup, the RF signal is detected from the disk and then amplified to obtain an eye pattern. The NRZI modulated eye pattern is converted into a square wave and then to an NRZ signal. The synchronization word is separated from the EFM signal and used for data synchronization. An EFM code consisting of 14-bit EFM words is converted into 8-bit data. In this way, the RF signal is demodulated to reproduce synchronization, subcode, audio, and error correction data.

The demodulation process is followed by an error detection and correction process. The CIRC error correction decoding process uses a combination of two Reed-Solomon code decoders C1 and C2. The C1 decoder corrects minor errors and errors that cannot be corrected with flags, and the C2 decoder helps with error flags to correct larger errors. If the CIRC decoder cannot correct all errors, the uncorrected data is marked with an erasure flag and these data are reconstructed in a linear interpolation manner.

The digital signal processor 14 includes a digital signal processing memory 15 for storing data generated in a digital signal processing process. The digital signal processing memory 15 may be inside or outside the chip on which the digital signal processing unit 14 is formed. In this embodiment, the digital signal processing memory 15 is an external memory.

FIG. 2 is a configuration diagram of a memory for processing digital signals in the optical disc player of FIG. 1. Referring to this, the digital signal processing memory 15 is divided into first to fourth memory areas MA1 to MA4 and allocated. The method of allocating the first to fourth memory areas MA1 to MA2 may be a fixed allocation method or a variable allocation method.

Demodulated data of the preliminary signal processing data PSPD is stored in the first memory area MA1. In general, EFM modulation (Eight to Fourteen Modulation) is widely used as a modulation method for storing data on an optical disc. EFM modulation is a modulation method that converts an 8-bit signal to 14 bits. Therefore, the EFM demodulated data is stored in the first memory area MA1.

The second memory area MA2 is a memory area for deinterleaving and error correcting the EFM demodulated data. In this embodiment, two deinterleaving and error corrections are made. As shown in FIG. 2, the second memory area MA2 may be divided into a first deinterleaving and error correction area C1 and a second deinterleaving and error correction area C2. The arrow direction in the second memory area MA2 is the direction in which data is read. That is, deinterleaving is performed by reading data in a predetermined pattern instead of sequentially reading adjacent data.

The third memory area MA3 is one or more memory areas temporarily stored in predetermined block units before the digital signal processing data DSPD is output. The unit to be stored is preferably a sector unit. One sector consists of a predetermined number of frames. In the case of a CD, 24 bytes of main data and 1 byte of subcode data are included in the case of a CD. The main data is information data and the subcode data is control data. When 98 frames are collected, they form one subcode format. Therefore, it is preferable that the unit of the third memory area also has 98 frames as one sector. The third memory area MA3 stores an area for storing one sector of data output to the output unit 16 and an area for storing error corrected data for one sector during data transmission to the output unit 16. It is preferred to have at least two sector areas, including. On the other hand, when the capacity of the memory area is increased, it is possible to prepare for the case where normal data cannot be read due to an impact in the pickup unit.

The fourth memory area MA4 serves as a buffer between the second memory area MA2 and the third memory area MA3. Therefore, the data of the second memory area is temporarily stored in the fourth memory area and then transferred to the third memory area. Data in the third memory area is transmitted in parallel according to the request signal REQ of the output unit 16.

The digital signal processing unit 14 outputs the confirmation signal ACK and the digital signal processing data DSPD in response to the request signal REQ of the output unit 16. The digital signal processing data DSPD is output in parallel in synchronization with a predetermined clock CLK. Preferably, the digital signal processing data (DSPD) is transmitted in units of bytes (bytes, 8 bits).

3 is a waveform diagram of major signals in the optical disc player of FIG. Referring to this, the data transmission operation between the digital signal processor 14 and the output unit 16 in the optical disc player of FIG. 1 will be described as follows. Here, TOS (Top of Sector) is a signal indicating that the start of every sector when transmitting data of several sectors, DSPD represents the digital signal processing data that is the output of the digital signal processor 14, REQ is the output unit 16 Is a signal for requesting the transmission of data to the digital signal processor 14, and ACK is a confirmation signal for whether or not the normal data is transmitted from the digital signal processor 14 to the output unit 16. The DTER is a signal indicating a data error in units of sectors.

The output unit 16 activates and outputs the request signal REQ in order to request transmission of the digital signal processing data DSPD. Herein, it is assumed that the level of the request signal REQ when activated is 'high'. When the digital signal processor 14 receives the activated request signal REQ, the digital signal processor 14 transmits the digital signal processing data PSPD together with the confirmation signal ACK in accordance with the clock CLK. In the present embodiment, the digital signal processing data DSPD is transmitted in accordance with the rising edge of the clock CLK, and the output unit 16 receives it at the falling edge. At this time, when the digital signal processing unit 14 sends the normal digital signal processing data PSPD, the digital signal processing unit 14 transmits the confirmation signal ACK activated at the 'high' level to the output unit 16. If the acknowledgment signal ACK is deactivated, the digital signal processing data PSPD at the clock CSTROBE is regarded as invalid data. Preferably, the request signal REQ and the confirmation signal ACK are activated on a sector basis.

The sector start signal TOS and the sector error signal DTER may be further used. The sector start signal TOS is a signal indicating the start of a sector and is activated for a predetermined time at the beginning of one sector to be transmitted. The sector error signal DTER is a signal indicating whether there is an error in data in the sector.

The output unit 16 receives the digital signal processing data DSPD, finally reproduces the information on the optical disc DISC, and outputs the information to the terminal device 19. The processing performed by the output unit 16 to finally reproduce the information on the optical disc DISC may vary depending on the type of the optical disc DISC. In the case of an audio CD, the output unit 16 performs relatively simple processing such as converting and amplifying digital data into analog data. In the case of a CD-ROM, the output unit 16 performs decoding according to the CD-ROM format. If the information on the optical disc is image data, the output unit 16 needs to perform decoding (generally MPEG decoding) to solve the compressed image information. The terminal device 19 may be a speaker, a monitor, a computer, or the like.

The output unit 16 performs a process of decoding the data (DSPD) transmitted from the digital signal processing unit 14, and in a master / slave manner, the data signal is unilaterally transferred from the digital signal processing unit 14 to the output unit 16. When the transfer is performed, data loss may occur when the decoding memory is busy. However, according to the embodiment of the present invention, when transmitting CD data, data is transmitted in units of bytes using a request / confirmation method to solve the transmission problem and to reduce a rose for controlling the decoding memory.

FIG. 4 is a flowchart showing a flow in which main signals are processed in the optical disc player of FIG. 1. Referring to this, the digital signal processing data (DSPD) transmission method between the digital signal processing unit 14 and the output unit 16 in the optical disc player of FIG. 1 is as follows.

Preliminary signal processing data PSPD is generated from the signal read out from the optical disc (401). The digital signal processor 14 demodulates and corrects the PSPD to generate digital signal processing data (DSPD) (402), and the data is stored in a memory in sector units (403). The output unit 16 outputs the activated request signal REQ when it is ready to receive the digital signal processing data DSPD from the digital signal processing unit 14 (404). When the digital signal processing unit 14 receives the activated request signal REQ, the digital signal processing unit 14 reads the digital signal processing data DSPD together with the confirmation signal ACK from the memory and outputs the parallel signal to the output unit 16 in parallel (405). . The digital signal processing data DSPD at the clock at which the acknowledgment signal ACK is deactivated is considered invalid data (406). When all of the requested digital signal processing data DSPD are received, the output unit 16 deactivates the activated request signal REQ (step 407).

Meanwhile, after performing the error correction process in the digital signal processor 14 of FIG. 1, the subcode information is reproduced. In the encoding process, 8 bits of subcode information per frame are included in the bit stream. In the decoding process, subcode data from 98 frames is read and grouped to form a block.

Each CD frame includes an 8-bit subcode containing information representing parameters such as the start and end points of the track, the number of tracks, and the index pointer. During the playback process, the subcode bits are used to properly interpret the information on the disc and allow the user to control the player in accessing the disc contents.

Fig. 7 shows the data structure of the CD subcode block, and 8-bit subcodes are represented by P, Q, R, S, T, U, V and W. Here, the P and Q subcode bits are used only for the audio format and are irrelevant in CIRC. The subcode block consists of 98 consecutive frames, each subcode block beginning with the synchronization pattern S ₀ , S ₁ at the first symbol position. The P channel contains flag bits and indicates the start of the track as well as the lead-in and lead-out areas of the disc. The Q channel has four kinds of information: control, address, Q data, and error correction code. The remaining R, S, T, U, V, and W bits are recorded as zero for most CDs.

The format of the CD-ROM is shown in FIG. 8, which can be said to be an extension of the format of an audio CD to a format for wider application to general information storage. The CD-ROM format has emerged as a medium for storing not only audio signals but also programs used in computers. The CD-ROM standard is derived from the CD-audio standard, but its data format is configured differently for the storage of general data.

As in the CD subcode, 98 CD frames are combined to form 2352 bytes (24 bytes x 98 frames). For a 60-minute disk, it has 283,500 blocks, the first 12 bytes of one block form a synchronization pattern, the next four bytes form a headfield for time and address flags, and the remaining 2336 bytes for user data and error correction data. Can be stored. The header consists of three address bytes and one mode byte, and each byte of the address stores the number of minutes, seconds, and blocks per second. The CD-ROM specification can be divided into two modes according to the structure of the data block. Mode 1 enables extended error detection and correction, and Mode 2 allows additional user data to be stored. The CD-ROM / XA data format is based on the CD-ROM mode 2 format, which can perform extended error detection and correction (Form 1) and increase the storage capacity of user data (Form 2). .

5 shows a map structure of the digital signal processing memory 15 considering not only main data but also subcode data. Along with the CD main data, subcode data and error correction (ECC) parity data matched thereto are also stored in the memory, and these data are transmitted together to the output unit 16 according to the request / confirmation method. The digital signal processor 14 may transmit the subcode data and the error correction (ECC) parity data to the output unit 16 in a time division manner using the same port as the main data, or the subcode data and the error correction (ECC). Parity data ports are available separately.

In the first memory area MA1, the EFM data (main data) 51 is written in the horizontal direction, and one byte of subcode data 52 is written at the end of one frame. The second memory area MA2 is a C1 / C2 error correction memory, and stores a correction flag according to the error correction in a flag memory (not shown, but a register or SRAM can be used). The fourth memory area MA4 temporarily stores the main data 51 for transmission in which error correction is completed and the subcode data 52 of the first memory area MA1 corresponding thereto. The third memory area MA3 receives the main data 55 and the corresponding subcode data 56 from the fourth memory area MA4 and the correction flag 57 from the flag memory, and receives the data in sector units. Configure and save the map. The data of the third memory area MA3 stored in sector units is transmitted to the output unit 16 in the form of byte parallel using a request / confirmation method.

As mentioned above, the CD-ROM data format is similar to that of CD-audio. However, while CD-Audio can be played with a CD-ROM drive, CD-ROM cannot be played with a CD-Audio drive. CD-ROM drives do not require digital-to-analog conversion, output filtering, and audio output, but require a computer for interface and output. The Video-CD format uses the MPEG-1 coding standard for audio and video, and is viewed in terms of disc standards. Is the same as the CD-ROM / XA Bridge Disk, Mode 2 Form 2. Thus, a video-CD can be played on a CD-ROM or CD-I drive but not on a CD-audio player.

The output unit 16 receives the digital signal processing data DSPD, performs a decoding process according to the type of CD, and outputs the final output data to the terminal device 19. In case of audio CD, the process of converting and amplifying digital data into analog data is performed, in case of CD-ROM, decoding is performed according to the CD-ROM format, and in case of video-CD, the compressed image information is decompressed. It is necessary to perform decoding.

The methods according to the invention can also be embodied as computer readable codes on a computer readable recording medium, including all devices having an information processing function. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, which are also implemented in the form of a carrier wave (for example, transmission over the Internet). It also includes. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the optical disc player according to the present invention, in the transmission of digital signal processing data from the digital signal processing unit to the output unit, the data at the output unit is transmitted by performing parallel transmission together with the request / confirmation signal instead of serial transmission in one-bit unit. It is easy to handle and reduces the possibility of errors.

In particular, in a video CD player, the output unit is mainly implemented with an MPEG chip incorporating a CD-ROM decoder. In this case, using the parallel transmission method of the present invention, the MPEG chip can receive digital signal processing data of a video CD only through the parallel port. During the memory control of the MPEG chip, the digital signal processing data can be received when the MPEG chip is ready without receiving the digital signal processing data. Therefore, the load of memory control of the MPEG chip can be reduced.

Claims (11)

A digital signal processing apparatus of an optical disc player for reproducing information of an optical disc, A data generator which receives an analog signal read from an optical disc and converts the signal into a digital signal, and performs output demodulation and error correction on the input digital signal to generate output data; A memory unit for temporarily storing the output data in a predetermined unit; A signal processor that reads the output data from the memory unit and outputs the confirmation signal in parallel in response to a predetermined request signal; And And an output unit for outputting the request signal to the signal processing unit, receiving the output data in parallel with the confirmation signal from the signal processing unit, processing the data according to the type of the optical disk, and generating output data. Digital signal processing device. The method of claim 1, wherein the memory unit A first memory area for storing demodulated data of the input digital signal; A second memory area for error correction of the demodulated data; And And a third memory area for receiving the error-corrected data and storing the error-corrected data in a predetermined block unit size. And the data stored in the third memory area is output in parallel units by the signal processor. A digital signal processing apparatus of an optical disc player for reproducing information of an optical disc, A data generator which receives a signal converted from an optical disk into a digital signal and demodulates and corrects the input digital signal to generate output main data and subcode data; A memory unit for temporarily storing the main data and subcode data corresponding thereto in predetermined units; A signal processor for outputting a confirmation signal while reading the main data and corresponding subcode data from the memory unit in parallel in response to a predetermined request signal; And An output unit for outputting the request signal to the signal processor to receive the main data and corresponding subcode data in parallel with the confirmation signal from the signal processor, and to process the main data based on the subcode; Digital signal processing apparatus for an optical disc player, characterized in that the. The method of claim 3, wherein the memory unit A first memory area for storing demodulated main data and subcode data corresponding thereto; A second memory area for error correction of the demodulated main data; And A third memory area for receiving the error-corrected main data and corresponding subcode data and storing the error-corrected main data in a predetermined block unit size; And the main data and subcode data stored in the third memory area are output in parallel units by the signal processing unit. The apparatus of claim 3, wherein the memory unit further includes a flag memory configured to store a correction flag according to an error correction of the main data. The third memory area receives the correction flag from the flag memory along with the error corrected main data and the corresponding subcode data, and stores the correction flag together with the main data stored in the third memory area by the signal processor. A digital signal processing apparatus for an optical disc player, characterized in that subcode data and correction flags are output in parallel units. An optical disc player for playing information on an optical disc, An analog signal processor for receiving the analog signal extracted from the optical disc and outputting preliminary signal processing data; Receive the preliminary signal processing data, perform predetermined digital signal processing to generate digital signal processing data and store it in a memory area, and read and store data of a predetermined size stored in the memory area in response to a predetermined request signal. A digital signal processor for outputting a confirmation signal together with the output; And And an output unit for outputting the request signal to the digital signal processing unit, receiving the digital signal processing data in parallel, performing a decoding process according to the type of the disk, and outputting the digital signal to the terminal device. The method of claim 6, wherein the digital signal processing unit A first memory area for storing demodulated data of the preliminary signal processing data; A second memory area for error correction of the demodulated data; And And a third memory area for receiving the error-corrected data and storing the error-corrected data in a predetermined block unit size. And outputting data stored in the third memory area in parallel units. The method of claim 6, wherein the data output in parallel from the digital signal processing unit And output flag data generated from the digital signal processing data, subcode data corresponding thereto, and correction flag data corresponding to error correction of the main data. Receiving the analog signal extracted from the optical disc and outputting preliminary signal processing data; Receiving the preliminary signal processing data and performing digital signal processing to generate digital signal processing data; Requesting data output according to a request signal; In response to the request signal, reading the digital signal processing data in units of a predetermined size and outputting the confirmation signal together in parallel; And And receiving the digital signal processing data in parallel and performing a decoding process according to the type of the disk. 10. The method of claim 9, wherein the data output in parallel in the output step is And outputting main data, subcode data corresponding thereto, and correction flag data according to error correction of the main data, generated from the digital signal processing data. Receiving the analog signal extracted from the optical disc and outputting preliminary signal processing data; Receiving the preliminary signal processing data and performing digital signal processing to generate digital signal processing data; Requesting data output according to a request signal; In response to the request signal, reading the digital signal processing data in units of a predetermined size and outputting the confirmation signal together in parallel; And And receiving the digital signal processing data in parallel and performing a decoding process according to the type of the disc. A computer readable recording medium having recorded thereon a program for executing a signal processing method in a computer in an optical disc player.