KR100238267B1 - Sector id detector of an optical disc reproduction system - Google Patents

Abstract

The present invention relates to an optical disc reproducing system, and more particularly to an apparatus for detecting a sector ID. The apparatus of the present invention comprises: a signal processor for demodulating and error correcting a signal read out from a digital signal recording medium; An interface memory for storing error-corrected data in the signal processor; A host that performs overall control of the optical disc playback system; And a host interface configured to receive the output of the signal processor under the control of the host and store the result in the interface memory, retrieve the sector ID stored in the interface memory, and output the result value to the host. An apparatus for detecting a sector ID of an optical disc reproducing system, the interface unit comprising: a sector ID detecting unit configured to detect sector ID by receiving sector data and sector ID location information; A sector ID counting unit for initializing a counter by receiving the output of the sector ID detecting unit and counting the sector ID to the sector position to be searched by receiving the sector ID position information; And a signal discrimination unit comparing the output of the sector ID counter with a threshold to determine whether the current sector ID matches the sector ID to be searched. Accordingly, the present invention can search a sector even if an error occurs in the sector ID to be searched, and the host interface searches for the sector ID value, thereby shortening the sector ID search time.

Description

Sector ID Detecting Device in Optical Disc Playback System

1 is a block diagram showing the configuration of a video-CD playback system.

2 is a block diagram showing the configuration of a sector ID detecting apparatus of the optical disc reproducing system according to the present invention.

3 is a detailed block diagram showing a preferred embodiment of the present invention.

4 is an operation timing diagram of the present invention when no error occurs in a sector ID.

5 is an operation timing diagram of the present invention when an error occurs in a sector ID.

The present invention relates to an optical disc reproducing system, and more particularly, to an apparatus for detecting a sector ID of an optical disc reproducing system which searches for a desired sector ID even when an error occurs in a sector ID reproduced from the optical disc.

A typical optical disc reproducing system reads and demodulates data from an optical disc, temporarily stores the data in a memory, and then decodes and outputs the stored data. In particular, in a video-CD decoder device, a compression ratio of video data stored on an optical disc A variable bit rate scheme is used to vary the transfer rate of the amount of data stored in memory.

1 is a block diagram showing the configuration of a video-CD playback system, in which data is read from a first controller (SUB-CPU) 1 and a digital signal recording medium (DSM; hereinafter referred to as an optical disk) for controlling the mechanism of the optical disk system. The pickup unit (not shown), the signal processing units 2 and 3 for demodulating the picked-up signal and performing error correction, and the host interface unit 4 which receives data output from the signal processing unit and interfaces with peripheral circuits 4. ), An interface memory (5) for storing error-corrected data in the signal processing section (3), a first controller (SUB-CPU; 1), an ost interface section (4), an audio / video decoder (7), etc. A host 6 which performs overall control of the < RTI ID = 0.0 > and < / RTI > an audio / video decoder 7 that decodes audio / video data under control of the host 6, and generates a control signal for supporting a variable length transmission rate scheme. 2nd And a controller (8). The signal processing section includes a demodulation section 2 for demodulating the picked up data, and an error correction code (ECC) section 3 for correcting errors in the demodulated data.

Based on the structure of FIG. 1, the operation | movement of this invention is demonstrated as follows.

The host 6 outputs a mechanism control signal through the host interface unit 4 to read data from the optical disc, and the host interface unit 4 receives the mechanism control signal and outputs it to the first controller 1.

The first controller 1 receives a mechanism control signal from the host interface unit 4 to control the mechanism of the pickup unit (not shown), and the demodulator 2 demodulates the data reproduced from the optical disc to perform the ECC unit 3. The ECC unit 3 corrects an error of data generated at the time of pickup and transmits it to the host interface unit 4.

The host interface unit 4 transmits the data input from the ECC unit 3 to the interface memory 5 under the control of the host, and transmits the data of the interface memory 5 to the host 6.

The host 6 receives the data request signal of the audio / video decoder 7 and transmits the data request signal to the host interface unit 4. The host 6 receives the data of the interface memory 5 from the host interface 4. 7)

In the conventional video-CD reproducing system, the host directly retrieves the sector ID of the data output from the interface memory 5, so that the load of the host increases, and accordingly, the sector ID retrieval time is long. In addition, when an error occurs in the data reproduced from the optical disc, the possibility of a sector ID retrieval failure becomes relatively high.

In addition, since video CDs using the variable transmission scheme as shown in FIG. 1 are frequently required to search for a sector ID, a sector ID search failure is more likely to occur when an error occurs in the data reproduced from the optical disc. Therefore, you should use a host with better performance than before, which will cause the price to rise.

An object of the present invention for solving the above-described problems is to shorten the sector ID search time by searching the sector ID of the data reproduced from the optical disc, and even if an error occurs in the sector ID to be searched. A sector ID detection apparatus of an optical disc reproducing system for retrieving a sector ID is provided.

In order to achieve the above object, the sector ID detection apparatus of the optical disc reproducing system according to the present invention,

A signal processor for demodulating and error correcting a signal read out from the digital signal recording medium;

An interface memory for storing error-corrected data in the signal processor;

A host that performs overall control of the optical disc playback system; And

Under the control of the host, it is preferable to include a host interface unit which receives the output of the signal processing unit and stores in the interface memory, retrieves the sector ID stored in the interface memory and outputs the result value to the host.

A sector ID detection apparatus of an optical disc reproducing system, the host interface comprising: a sector ID detection unit configured to detect a sector ID by receiving sector ID location information INPUT1 and sector data INPUT2;

A sector ID counting unit for initializing a counter by receiving the output of the sector ID detecting unit and counting the sector ID to the sector position to be searched by receiving the sector ID position information; And

It is preferable to include a signal discrimination unit which compares the output of the sector ID counter and the threshold to determine whether the current sector ID matches the sector ID to be searched.

In addition, the signal discriminating unit preferably determines that the sector data is normal when the result value of adding the output of the sector ID counting unit is equal to or greater than the threshold value.

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

FIG. 2 is a block diagram showing the configuration of the sector ID detecting apparatus of the optical disc reproducing system according to the present invention, showing the structure of the sector ID detecting apparatus included in the host interface 4 of FIG. Here, the sector ID detection unit 42 receives the sector ID position information INPUT1 and the sector data INPUT2 to detect the sector ID, and the sector ID counting unit 44 receives the output of the sector ID detection unit 42. Initializes the counter and counts the sector ID up to the sector position to be searched by receiving the sector ID position information INPUT1, and the signal discrimination unit 46 compares the output of the sector ID counting unit 44 with a threshold value to determine sector data. Determines whether an error has occurred.

FIG. 3 is a detailed block diagram showing a preferred embodiment of the present invention, which is a detailed block diagram of a sector ID detecting apparatus of the optical disc reproducing system that detects from N-5 sectors when the sector to be searched is N. FIG.

Here, the first detector 421 to the fifth detector 425 detect N-5 sectors to N-1 sectors, respectively. In addition, the first counter 441 to the fifth counter 445 receives the outputs of the first detector 421 to the fifth detector 425, respectively, initializes them, and receives the sector ID position information INPUT1 to receive N sectors. A predetermined logic level is output by counting up to the ID. The signal discrimination unit 46 adds the outputs of the first counter 441 to the outputs of the fifth counter 445 and then outputs a signal for determining whether an error has occurred in the sector data by comparing with a known threshold value. .

4 is an operation timing diagram of the present invention when no error occurs in a series of sector IDs, and FIG. 5 is an operation timing diagram of the present invention when an error occurs in a series of sector IDs.

Referring to Figures 3 to 5 the operation of the present invention will be described.

3 and 4, the sector ID position information INPUT1 and the sector data INPUT2 are inputted to the first detector 421 to the fifth detector 425 so that the N-5 sector ID to the N-1 sector are input. ID is detected. That is, FIG. 4A is a waveform showing a sector ID value, and FIG. 4B is a waveform showing sector ID position information INPUT1. 4C to 4G are output waveforms of the first detector 421 to the fifth detector 425.

The first counter 441 inputs the output of the first detector 421 to initialize the counter at the N-5 sector ID detection position shown in FIG. 4C, and inputs the sector ID position information INPUT1 to the N sector ID. After counting the number up to and outputs a signal as shown in the fourth 4h signal to the signal discriminator (46). The second counter 442 inputs the output of the second detector 422 to initialize the counter at the N-4 sector ID detection position shown in FIG. 4D, and inputs the sector ID position information INPUT1 to the N sector ID. After counting the number of to and outputs the signal as shown in FIG.

In the same manner, the third counter 443 to the fifth counter 445 receive the outputs of the third detector 423 and the output of the fifth detector 425, respectively, and signal the same signals as those of FIGS. 4j to 4l. Output to discrimination unit 46.

The signal discrimination unit 46 adds the outputs of the first counter 441 to the outputs of the fifth counter 445 to determine whether the value is equal to or greater than a predetermined threshold value (assuming 3 here) and the current sector. A signal (FIG. 4m) for determining whether the ID matches the sector ID to be searched is output. That is, since the value obtained by adding the output of the sector ID counter 44 becomes equal to or greater than 5, the sector data INPUT2 read from the interface memory 5 is output to the host 6.

FIG. 5 is an operation timing diagram of the present invention when an error occurs in a sector ID. It is assumed that an error occurs in an N-4 sector and an N-2 sector and has an A value and a B value, respectively. 5A is a waveform showing a sector ID value, and FIG. 5B is a waveform showing sector ID position information INPUT1.

5c to 5g are output waveforms of the first detector 421 to the fifth detector 5, and the second detector 422 and the fourth detector 424 are N as shown in FIGS. 5d and 5f. The sector ID cannot be detected because an error has occurred in the -4 sector ID and the N-2 sector ID.

The first counter 441 to the fifth counter 445 operate as described above, and the outputs of the first counter 441 to the fifth counter 445 are the same as those of 5h to 5l. Here, the first counter 421, the third counter 423, and the fifth counter 425 output the logic level 'high' to the signal discriminator 46, and the second counter 422 and the fourth counter ( 424 outputs the logic level 'low' to the signal discrimination unit 46.

The signal discrimination unit 46 adds the outputs of the first counter 421 to the outputs of the fifth counter 425, determines whether the value is equal to or greater than a predetermined threshold value, and determines the sector ID to be searched by the current sector ID. And a signal (Fig. 5M) for determining whether or not That is, since the result value obtained by adding the output of the sector ID counter 44 is 3 or more, the host 6 receives the sector data INPUT2 read from the interface memory 5 by determining that the sector data is normal. Will output

Therefore, even if a predetermined number of errors occur in the series of sector IDs as shown in FIG. 5, if a sector ID more than a threshold value is detected, the sector data to be searched is regarded as normal and outputted to the host 6 to output the audio / video decoder 7. Play on

As described above, the sector ID detection apparatus of the optical disc reproducing system according to the present invention has an effect of reducing the load of the host and shortening the sector ID search time by the host interface controlled by the host searching for the sector ID value. In addition, even if an error occurs in the sector ID to be searched, if the number of detected sector IDs is equal to or greater than a threshold value, the sector data may be reproduced to reduce the possibility of sector search failure.

Claims (2)

An optical disc reproducing system comprising a signal processor for demodulating and error correcting a signal read out from a digital signal recording medium, an interface memory for storing error corrected data in the signal processor, and a host performing overall control of the system. In the sector ID detection device for searching the sector ID between the interface memory, A sector ID detecting unit detecting sector ID by inputting sector data and sector ID location information stored in the interface memory according to the control of the host; A sector ID counting unit initialized by the sector ID detecting unit and counting the sector ID up to a sector position to be searched using the sector ID position information; And And comparing the output of the sector ID counter with a predetermined threshold to determine whether the current sector ID matches the sector ID to be searched, and outputting the determined result value to the host. A sector ID detection apparatus in an optical disc reproducing system. The apparatus of claim 1, wherein the sector ID detector and the sector ID counter each include a plurality of detectors and a plurality of counters corresponding to the detectors. And the signal discriminating unit determines that the sector data is normal when a result value of adding the outputs of the plurality of counters is equal to or greater than the predetermined threshold value.