Apparatus and method of detecting a target peak value and a target bottom value of an input signal

Abstract

The present invention provides a device which is used for detecting the target peak value and target bottom value of the input signal and the method. The device comprises a detecting circuit and a judgment logical circuit. The detecting circuit is coupled to the input signal and is used for detecting one target peak value and one target bottom value of the input signal, wherein the time period is not less than the period of a reference signal generated by accessing the optical storing medium. The judgment logic circuit is coupled to the detecting circuit and is used for determining a reference according to the target peak value and the target bottom value. The device of the invention can prevent the generating of the incorrect image signal when the optical reading and writing head reverses relative to the moving direction of the compact disc.

Description

technical field [0001] The present invention relates to processing signals generated by an optical read / write head, in particular to a method for processing a radio frequency ripple (RFRP) signal based on a tracking zero-cross (TZC) signal to generate a signal for Apparatus and method for cutting the radio frequency chain wave signal to generate a slicer level of a mirror signal. Background technique [0002] Optical discs have become a common storage medium today. When accessing an inserted optical disc (that is, writing data to or reading data from an optical disc), the optical drive must move the optical head to a target track , generally speaking, the servo system in the optical drive needs to be responsible for activating the existing track jump (also called track seeking) to find the track corresponding to the target track number. These two signals, the mirror image signal and the tracking zero-crossing signal, are often referenced by the servo system to complete the ...

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Problems solved by technology

For example, each positive edge of the tracking zero-crossing signal is used to sample the peak value of the RF chain wave signal, and each negative edge of the tracking zero-crossing signal is used to sample the RF chain wave signal However, the direction of movement of the optical head relative to the optical disk will cause the optical head to exceed the target track due to the disc eccentric or the driving force applied to the optical head And reverse, so that the amplitude value sampled at each positive edge of the tracking zero-crossing signal becomes the valley value, and in addition, the amplitude value sampled at each negative edge of the tracking zero-crossing signal becomes becomes the peak value. Obviously, when the moving direction of the optical read-write head is reversed relative to the optical disk, two consecutive peak values ​​or two consecutive valley values ​​will be obtained at the edge of the adjacent signal. Therefore, the above average corresponds to Stepping of sampled values ​​at adjacent signal edges may produce wrong clipping levels and thus incorrect image signals

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