DVD tracking servo control system for high speed reading partiality disc

Abstract

The present invention relates to a DVD tracking servo control system with high-speed read on eccentric disks in the technical field of electronic information; and comprises a band pass filter module, the circuit of which is composed of a signal processing circuit and an inverter circuit; a test conversion module that converts optical signals of a laser read or write device into electric signals which are then compared with the given value of the system to produce almost linear tracking error signals; and an intelligent decision-making module that judges whether the disk is eccentric or not after the processing on the tracking error signals. In case of eccentricity, the band pass filter module is utilized to redeem and rectify the aberrated tracking error signals caused by the eccentricity, then the tracking error signals are transported to the tracking servo system via a universal control module, otherwise, the tracking error signals directly enter the universal control module and then get transported to the tracking servo system. The present invention can have rapid access into the eccentric DVD disk, thereby greatly improving the Run-Out resistant interference capability of the DVD system and the performance and the success rate of reading the eccentric disk. The system has the advantages of excellent stability, simple form, few parameters and easy online debugging.

Description

technical field [0001] The present invention relates to a control system in the field of electronic information technology, more specifically, to a tracking servo control system for high-speed reading of eccentric DVD discs. Background technique [0002] DVD disc drive tracking servo control mechanism is mainly composed of two parts: a coarse adjustment actuator and a fine adjustment actuator. Its equivalent physical model can be regarded as a double-car structure. There are complex coupling relationships. Among them, the cart corresponds to the coarse adjustment actuator, which is generally a DC brushless motor, which is mainly used for fast and long-distance tracking. It has a large moving range, but the bandwidth is relatively small, and the corresponding speed is relatively slow. The trolley corresponds to the fine-tuning actuator, which is a voice coil motor and carries the laser reader OPU (optical pick-up). Its main function is short-distance tracking and tracking. T...

AI Technical Summary

Problems solved by technology

However, in order to meet this requirement, the standard characteristics of the ideal open-loop tracking servo determine that the rotation frequency of the disc cannot be greater than 23.1 Hz. For a speed higher than 23.1 Hz, the ratio of the tracking error to the eccentricity of the disc will be greater than K 0 , DVD tracking servo system will not meet the requirements

However, the speed of modern DVD has reached 48 times, and the speed of the spindle motor is 9600 rpm, about 160Hz, so the system cannot suppress such a high-frequency run-out disturbance signal, so it cannot read eccentric discs at high speed

[0004] After searching the literature of the prior art, it is found that the Chinese invention patent (application number 01110490.2) proposes an optical drive tracking servo system and method, which is used to control the optical read-write head to track the data track, including: Sensing device, control device, decision-making device and power device are only suitable for discs without eccentricity, and cannot solve the problem of sinusoidal cycle run-out (Run-Out) caused by disc eccentricity, let alone at a speed exceeding 23.1Hz Read eccentric DVD discs at high speed

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