KR100202576B1 - Layer identification device and method of disk reader - Google Patents

Abstract

The present invention relates to an apparatus and method for determining a layer of a disc player. In the related art, a malfunction occurs when a high frequency is not properly detected due to a pickup or a shake of the disc. In the related art, a circuit capable of discriminating a layer with respect to a multilayer disc is provided. There is a disadvantage that is not implemented. In order to solve such a conventional problem, when the user inputs the desired layer information, the invention is designed to reproduce the layer by reading the layer information formatted on the disk after controlling focus and tracking through servo control. If the user inputs the desired layer information during playback, the corresponding layer is played by detecting and comparing the current layer information so that accurate playback can be performed without malfunction.

Description

Apparatus and Method for Determining Layers in Disc Players

1 is a block diagram of a layer discriminating apparatus of the present invention.

FIG. 2 is a block diagram of an information comparison determining unit in FIG.

3 is a signal flow diagram for layer determination in the present invention.

* Explanation of symbols for main parts of the drawings

201: disc 202: pickup

203,208: amplifier 204: signal processor

205: information comparison determination unit 206: key input unit

207: servo control unit 211: layer information detector

212: Memory 213: Comparator

214: controller

The present invention relates to a disc player, and more particularly, to an apparatus and method for determining a layer of a disc player for determining a corresponding layer in a multi-layer disc.

Conventionally, as a pickup scans a disk with a laser and detects the reflected light, the pickup counts a number at which a high frequency level is detected and determines layer information based on the counted value.

Accordingly, the focus and tracking errors are compensated with the determined layer information to perform a stable playback operation.

However, conventionally, there is a problem that a malfunction occurs if the high frequency is not properly detected due to the shaking of the pickup or the disk.

In addition, there is a conventional disadvantage that a circuit for discriminating a layer is not implemented for a multilayer disk.

In order to solve the conventional problems, the present invention is directed to a disc player designed to reproduce a layer by reading a layer information formatted on a disc after controlling focus and tracking through servo control when a user inputs desired layer information. An object of the present invention is to provide an apparatus and method for determining layers.

In order to achieve the above object, the present invention provides pickup means for detecting recording data on a disc, signal processing means for performing a process such as demodulation and error correction of the output signal of the pickup means, and inputting target layer information. Information comparison determination means for comparing a key input means, target layer information of the key input means with current layer information extracted by the signal processing means, and outputting a layer shift command; an output signal of the information comparison determination means and the pickup And an servo control means for controlling the focus and tracking of the pickup means with the output signal of the means as an input.

The information comparison determining means includes a layer information detector for detecting layer information at the output of the signal processing means, a memory for storing target layer information set by the key input means, the target layer information stored in the memory and the layer information detector. A comparator for comparing the current layer information and a controller for outputting a layer move command according to the comparison result of the comparator.

In addition, the present invention is to determine whether the target layer and the currently read layer is consistent after reading the layer information after turning on the focus servo and tracking servo to achieve the above object, if the target layer and the currently read layer is inconsistent After turning off the tracking servo, moving the focus to the target layer, turning on the tracking servo, and performing a playback operation when the target layer matches the currently read layer.

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

1 is a block diagram showing an embodiment of the present invention, as shown therein, a pickup 202 for detecting recording data on a disk 201, and an amplifier 203 for amplifying an output signal of the pickup 202. As shown in FIG. ), A signal processing unit 204 for performing signal processing such as demodulation and error correction of the output signal of the amplifier 203, a key input unit 206 for inputting target layer information, and the key input unit 206 An information comparison determination unit 205 for outputting a layer shift command by comparing target layer information of the current layer with current layer information extracted by the signal processor 204, a layer shift command of the information comparison determination unit 205, and the pickup; A servo control unit 207 which controls the focus and tracking of the pickup 202 via the amplifier 208 as the input of the servo error signal at 202.

The information comparison determination unit 205 may include a layer information detector 211 for detecting layer information at the output of the signal processor 204, a memory 212 for storing target layer information set by the key input unit 206, and A comparator 213 for comparing target layer information stored in the memory 212 with current layer information of the layer information detector 211, and a controller 214 for outputting a layer shift command according to the comparison result of the comparator 213 It is a microprocessor composed of).

Referring to the operation and effect of the present invention configured as described above are as follows.

When the servo control unit 207 turns on the focus servo and tracking servo by loading the disc 201 and starting playback, the pickup 202 moved to the initial position of the disc 201 receives the recording data of the initially set layer. Will be detected.

At this time, the servo controller 207 checks the output signal of the pickup 202 and detects a servo error, thereby controlling focus and tracking of the pickup 202 through the amplifier 208.

As a result, a stable reproducing operation is performed by the pickup 202 accurately detecting the recording data on the disc 201.

Thereafter, when the user inputs a desired layer by using the key input unit 206, the information comparison determination unit 205 temporarily stores the memory layer 212 in the memory 212.

At this time, the information comparison determination unit 205 transmits a layer movement command to the servo control unit 207 so that the pickup 202 can focus the layer on the disc 201 desired by the user.

Accordingly, when the pickup 202 detects the recording data on the disk 201, the amplifier 203 amplifies and outputs a predetermined level, and the signal processing unit 204 performs a process such as demodulation and error correction. The information is output to the information comparison determination unit 205.

In this case, when the layer information detector 211 extracts the current layer information from the output signal of the signal processor 204, the information comparison determiner 205 matches the target layer information stored in the memory 212. You will be judged.

Accordingly, when the comparison result of the comparator 213 does not match and the controller 214 outputs a layer shift command, the servo controller 207 turns off the tracking servo and then focuses the focus of the pickup 202 to match the target layer. After driving the actuator, the track servo is turned on again.

After that, when the amplifier 203 detects the output signal of the pickup 202 at a predetermined level, the signal processing unit 204 processes the signal and outputs the signal to the information comparison determination unit 205.

In this case, when the layer information detector 211 detects the current layer information, the information comparison determination unit 205 performs an operation of comparing whether the comparator 213 matches the target layer information stored in the memory 212.

Therefore, when the comparison result matches, the comparator 213 performs a playback operation on the current layer.

This operation is performed by repeating the same process as the signal flow of FIG. 3 whenever desired layer information is input during the reproduction operation.

As described in detail above, when the user inputs the desired layer information during playback, the present invention has the effect of accurately playing without malfunction by playing the corresponding layer by detecting and comparing the current layer information.

Claims (3)

Pickup means for detecting recording data on the disk, signal processing means for demodulating and error correcting the output signal of the pickup means, key input means for inputting target layer information, and the signal processing means. Information comparison determination means for extracting current layer information from an output signal and comparing the target layer information inputted to the key input means to output a layer shift command; an output signal of the information comparison determination means and an output signal of the pickup means; And a servo control means for controlling the focusing and tracking of the pickup means as an input. The information comparison determination means according to claim 1, further comprising: a layer information detector for extracting layer information from an output of the signal processing means, a memory for storing target layer information set by the key input means, a target layer information stored in the memory; And a controller for comparing the current layer information of the layer information detector with a controller for outputting a layer movement command to the servo control means according to the comparison result of the comparator. A first step of inputting target layer information, a second step of determining whether the current layer information and the target layer information match after turning on the focus servo and the tracking servo, and if the target layer and the current layer do not match And a fourth step of moving the focus to the target layer after turning off the tracking servo and turning on the tracking servo, and performing a playback operation when the target layer matches the currently read layer. Layer determination method.