KR100247340B1 - The method for processing search error of photo disc player - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of processing a search error in an optical disc reproducing apparatus.

2. Technical problem to be solved by the invention

The search error occurs every time the error area is searched as the search is performed irrespective of the defective area on the disk, and the same process is repeated every time, thereby improving unnecessary search time.

3. Summary of Solution to Invention

Register at least one area where an error continuously occurs when searching for selected target areas on the disk as an error area, and if the target area is included in the error area when searching with the error skip mode set, Skip the search for.

4. Important uses of the invention

It is used to deal with search errors caused by defects on a disc in an optical disc player.

Description

Search Error Handling Method of Optical Disc Player

1 is a blur configuration diagram of a general optical disc player.

2 is a block diagram of an optical disc reproducing apparatus according to the present invention.

3 is a flowchart of processing a search error according to the present invention.

4 is an error skip processing flowchart for an error area on a disk according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus, and more particularly to a method of processing a search error.

In general, in an optical disc player such as CDP (Compact Disc Player), CD-ROM (Compact Disc-Read Only Memory), LDP (Laser Disc Player), MD (Mini Disc), data is tracked spirally arranged on a disc. Recorded in the field. Data recorded on these tracks is read out by being picked up by an optical pickup.

The block diagram of the above general optical disc player is shown in FIG. The optical pickup and deck unit 100 includes an actuator for tracking servo and focusing servo, and a spindle motor for rotating the disk at constant linear velocity (CLV). spindle motor). The tracking servo refers to following the optical pickup to the track on the disk, and the focusing servo refers to keeping the focus of the optical pickup on the disk "on". The optical pickup and deck unit 100 optically picks up the information recorded on the disk, converts the information into an electrical signal, and applies the RF signal to the RF (Radio Frequency) amplifier 102. The RF circuit 102 amplifies and waveforms a signal applied from the optical pickup and deck unit 100 and applies an EFM (Eight to Fourteen Modulation) signal to the DSP (Digital Signal Processor) 104 to provide a tracking servo and a focusing servo. Generate signals for and apply them to the servo controller 108. At this time, the RF circuit 102 also generates and applies a focus on signal FOK (focus OK) indicating whether or not the focus is "on" to the microcomputer 110. The DSP 104 demodulates the EFM signal applied from the RF circuit 102, outputs the error checking and correcting (ECC) to the output processing unit 206, and the optical pickup and deck unit 100 on the current disk. Decodes the physical address picked up by the reference) and applies it to the output processor 106, the servo controller 108, and the microcomputer 110. At this time, the DSP 104 selects a fixed speed lock signal LOCK indicating whether or not the rotational speed of the disk is locked to the set fixed speed, and a frame detection signal GFS (Good Frame Signal) indicating whether the address synchronization is detected. Is generated and applied to the servo controller 108 and the microcomputer 110. The output processor 106 processes the data output from the DSP 104 to generate a final output signal such as an audio signal. The servo controller 108 is controlled by the microcomputer 110 and controls the tracking servo and the focusing servo of the optical pickup and deck unit 100 according to signals applied from the RF circuit 102 and the DSP 104. The microcomputer 110 controls the overall control unit according to the key input from the operation unit 112 to perform various functions of the optical disc reproducing apparatus. The operation unit 112 includes a plurality of keys for performing various functions of the optical disc reproducing apparatus, and a display device for displaying various information according to the operation of the optical disc reproducing apparatus. Typically, the focus on signal FOK is generated at the "high" level when the focus is "on" and at the "low" level when the focus is not on. In addition, the fixed speed lock signal LOCK is generated at the "low" level when locked at the set fixed speed, and is generated at the "high" level when not locked.

In the above optical disc reproducing apparatus, a track of a target area is searched for reading data recorded in a specific target area on the disc. During the search, the optical pickup is track jumped to move to the track of the target area. At this time, the microcomputer 110 controls the servo controller 108 to move the optical pickup to find the target address, which is the physical address of the target track, on the disc. In this search, the target address is not detected and an error may occur. . Such an error is commonly referred to as a search error, and a search error is mostly caused by a defect on a disc except a failure of a disc reproducing apparatus.

Typically, the microcomputer 110 refers to a focus on signal FOK generated from the RF circuit 102, an address generated from the DSP 104, a fixed speed lock signal LOCK, a frame synchronization lock signal GFS, and the like, and a search error for the target area. Determine whether or not. In this case, the conditions for determining the search error for the target area will be described below. For example, if any one of the following four conditions is applicable, the search error is determined. The first is a case where the non-focus on state is maintained for a predetermined time (for example, 2 ms) or more, that is, the focus on signal FOK maintains the "low" level for a certain time. The second case is when the fixed speed is not locked at a fixed speed for more than a predetermined time (for example, 100 ms), that is, the fixed speed lock signal LOCK is maintained at a "low" level. The third is when the addresses are not contiguous. Fourth, when address synchronization is not detected.

When an error occurs in the target area to be searched as described above, conventionally, the read data is passed to the output processing unit 106 as it is or after retrying the search, it passes.

At this time, if a search error occurs due to a defect on the disk as described above, the search error still occurs even after retrying the search, and the search error is continuously generated when the search area is to be searched thereafter.

Therefore, in the related art, as a search is performed irrespective of a defective area on a disk, a search error occurs every time an error area is searched, and the same process is repeated every time, thereby requiring unnecessary search time.

Accordingly, an object of the present invention is to provide a search error processing method which can prevent unnecessary search time by skipping a defective area on a disk during search.

Another object of the present invention is to provide a search error processing method that allows a user to select whether to play or skip a search error region.

In order to achieve the above objects, the present invention registers at least one region in which an error occurs continuously when searching for selected target regions on a disk as an error region, and then the target region at the time of search is set in an error skip mode. When included in the region, the search for the target region is skipped.

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

Many specific details are set forth in the following description and in the accompanying drawings to provide a more general understanding of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

2 shows a block diagram of an optical disc reproducing apparatus according to the present invention. In FIG. 2, the optical pickup and deck unit 200, the RF circuit 202, the DSP 204, the output processing unit 206, the servo control unit 208, the microcomputer 210, and the operation unit ( The optical pickup and deck unit 100, the RF circuit 102, the DSP 104, the output processor 106, the servo controller 108, and the microcomputer 110 of FIG. And the same as the operation unit 112. However, by adding a RAM (214) for accessing by the microcomputer 210 and registering an error area on the disk, the microcomputer 210 is programmed by adding a function according to the flowcharts of FIG. 3 and FIG. will be.

In the optical disc reproducing apparatus according to the present invention as shown in FIG. 2, the microcomputer 210 registers at least one or more regions in which errors occur continuously when searching for the selected target regions on the disc as the error regions in the RAM 214. FIG. 3 is a flowchart illustrating processing of a search error of the microcomputer 210.

Referring now to FIGS. 2 and 3, the microcomputer 210 searches the target area in steps 300 and 302 to check whether a search error occurs at that time. At this time, the microcomputer 210 determines whether the search error is a search error when any one of the four conditions is applied as in the above-described example.

If a search error occurs in steps 300 through 302, the microcomputer 210 sets an error mode in step 304, increases the number of repetitions CNT in step 306, and repeats in step 308. Check if the number of CNTs is four.

At this time, if the repetition number CNT is not 4, the steps (300) to (302) are repeated. On the contrary, if the number of repetitions CNT is 4, the target area is changed in step 310, and the address of the target area is stored in the RAM 214 as the start address of the error area and registered in the list as shown in Table 1 below. .

Therefore, if a search error occurs even after retrying the target area for 4 times, the target area is determined to be an error area, and the address of the target area is registered as a start address indicating the start of the error area. . In this case, the above-described operation is performed on the next target area by changing the target area to be searched to the next target area. Herein, the repetition number CNT is set to a maximum of four, and an appropriate number is set as necessary.

In addition, when a search error does not occur in steps 300 to 302, the microcomputer 210 clears the repetition number CNT in step 312 and checks whether an error mode is set in step 314. At this time, if the error mode is set, the previous target area was the error area, but the current target area is not the error area. In step 316, the address of the current target area is stored in the RAM 214 as the end address of the error area. This registers the list as shown in Table (1) described later. On the contrary, if the error mode is not set in step 314, the previous and current target areas are not error areas, and thus the process ends.

As described above, the format of the list in which the start address and the end address of the error area are stored and registered in the RAM 212 is shown in Table 1 below.

Table (1)

Table 1 shows an example of the structure of the list when there are three error areas on the disk.

In the state where all the error areas on the disk are registered by the above-described process, the user selects whether to skip the error area on the search through the operation unit 212, and the microcomputer 210 corresponds to FIG. In accordance with the flow chart, skip search or normal search is performed.

4 is an error skip processing flowchart of an error area on a disk according to the present invention, and shows a process of skipping a search for a target area when the target area is included in the error area when the search is performed with the error skip mode set. will be.

Referring now to FIGS. 2 and 4, when searching for a target area on a disk, the microcomputer 210 first checks whether an error skip mode is set in operation 400. In this case, if the error skip mode is not set, the normal search operation is performed, and if the error skip mode is set, step 402 is performed. In step 402, it is checked whether an address of a current target area is included in an error area registered in a list such as the table 1 stored in the RAM 214. At this time, when the target address is a value between the registered start address and the end address as shown in Table 1, it is determined that the target address is included in the error area. If the target address is not included in the error area, the target area is not an error area and thus performs a normal search operation. On the other hand, if it is included in the error area, the end address shown in Table 1 is searched for in step 404. In other words, the normal area after the error area is searched.

Therefore, the error area due to a defect on the disk can be skipped and searched.

As described above, the present invention can increase the search speed by preventing unnecessary search for a defective error area on a disk, and reduce battery consumption in a portable device by reducing the search time due to a disk error, and skipping an error area. The advantage is the user can choose whether or not.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention.

Claims (3)

In the search error processing method of the optical disk player, An error area detection process of registering an area in which an error occurs when searching for selected target areas on the disk as an error area; The search error processing method comprising: a skip search process for skipping a search for a corresponding target area when the target area is included in the error area when searching in an error skip mode. The method of claim 1, wherein the error area detection process comprises: Searching for the target area and searching for a search error; Repeating the search and search error checking process for a preset number of times until the search error does not occur after setting an error mode when the search error occurs; When the search error occurs, the target area is determined to be an error area, the target area is changed, and the address of the target area is registered as the start address of the error area until the search error occurs until the search error is repeated as many times as the set number of times. Process, Searching for an address of the current target area as an end address of the error area when a search error for the changed target area does not occur or is less than the set number of times when the error mode is set. Treatment method. The search error processing method of claim 2, wherein the steep search process skips the target area and searches for an end address of the target area.