Method and circuit for detecting represented signals

Abstract

A method and circuit for detecting a reproduced signal, the circuit includes a detector, a control unit and a compensator. The detector detects the output of the photodetection device corresponding to the combination of signals corresponding to the sections of the photodetection devices arranged in the track direction, arranged in the radial direction, and arranged diagonally; the control unit according to the recording medium The data situation on the recording medium, the interference between the optical signals reflected / diffraction from adjacent pits and adjacent tracks on the recording medium, the system state detection results, provide selection control signals and compensation signals; the output of the compensator adaptive compensation selection . Thus only the minimally degraded output of the photodetection device is used as the reproduced signal.

Description

technical field [0001] The present invention relates to the detection of reproduced signals, and more particularly to a method of detecting only certain outputs of optical detection devices with minimal distortion or degradation in an optical recording / reproducing system, and corresponding circuits. Background technique [0002] In recording / reproducing systems for optical recording media such as compact discs (CD) and digital versatile discs, data is recorded on the disc in the form of pits on a substrate or a variation of the recording film layer. Data on the disc is detected by irradiating the disc with laser light and detecting the reflected light. In the recording / reproducing system, due to the geometric dimensions (such as width, length, depth, and angle) of the data pit and the recording range, there is a time delay between the outputs of the photodetection device, and also due to the time delay between the data in the tangential direction. Time delay caused by inter...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, a method of detecting the reproduced signal by simply adding the outputs of the I / V converters 106, 108, 110, and 112 is adopted, so that due to the condition of the data recorded on the disc, crosstalk, from adjacent pits and Interference between optical signals reflected / diffraction from adjacent tracks on the recording medium, and other system problems such as defocus, de-tracking, and tilt, resulting in degradation of the reproduced signal

Therefore, the quality of the reproduced signal and the performance of the system degrade

[0007] As described above, as the recording / reproducing system using the optical recording medium is designed for high-density and high-speed recording / reproducing, due to the condition of the data recorded on the disc, from adjacent pits and from adjacent optical discs on the recording medium, Interference between the reflected / diffraction optical signals, and other system problems (such as defocus, loss of tracking and tilt), the degradation of the signal becomes serious, which leads to many problems during system implementation

Images