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Synchronizing signal detecting method and device for optical disk

A synchronization signal and detection device technology, applied in digital signal formatting, digital recording/reproduction, etc., can solve the problem that the optical disc reading signal cannot be successfully demodulated, affects the demodulation process of the optical disc reading signal, and affects the optical disc reading Signal synchronization signal and other issues

Active Publication Date: 2008-08-13
REALTEK SEMICON CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

When the signal jitter drives the sampling clock to not sample at the exact timing (that is, the phase of the sampling clock is shifted), the sampling signal is judged as a wrong signal level, thus affecting the synchronization signal of the optical disc reading signal or affecting the optical disc reading. The demodulation processing of the signal may even cause the optical disc reading signal to fail to complete the demodulation smoothly

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  • Synchronizing signal detecting method and device for optical disk
  • Synchronizing signal detecting method and device for optical disk
  • Synchronizing signal detecting method and device for optical disk

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Embodiment Construction

[0048] Please refer to figure 1 , figure 1 It is a schematic diagram of applying the sampling phase adjustment device 20 and the synchronous signal detection device 30 of the present invention to an optical drive 10 . The optical drive 10 inputs an input signal Sin (such as EFM data read from an optical disc) from the outside, the analog filter 12 can filter the input signal Sin to generate a filtered signal S, and the limiter 14 is based on a limiter voltage The slice level converts the filtered signal S into a corresponding sliced ​​signal S'. In addition, the asymmetric compensation module 16 is connected to the limiter 14 to form a feedback for removing the DC offset (DC offset) of the limiter signal S', that is, to correct the limiter 14. level to achieve the purpose of reducing the DC offset, and the PLL 18 generates a corresponding sampling clock CLK according to the limiting signal S'. The sampling phase adjusting device 20 is used to adjust the sampling phase of th...

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Abstract

A device for regulating phase of sampling clock consists of sampling module for generating multiple sampling data, comparing module for comparing these sampling data to preset synchronous mode to generate a comparing result and carrying out above comparing action again to generate another comparing result after interval of preset time as well as regulating module for counting up comparing results and regulating phase of sampling clock according to counted up result.

Description

technical field [0001] The present invention relates to a method and device for processing optical disc read signal, and at the same time relates to a method and its device for predicting the synchronous signal of optical disc read signal by comparing sampling data and synchronous pattern and adjusting the sampling phase of optical disc read signal. Background technique [0002] In a communication system, in order to align each frame (frame), the transmitting end usually adds a synchronization pattern (synchronization pattern) to transmit the signal, while the receiving end uses acquisition or tracking (tracking) when receiving the signal. and other methods to find the synchronization pattern, and then decode the data after the synchronization pattern. Taking Digital Versatile Disc (DVD) as an example, the synchronization mode used by DVD is fourteen consecutive signals with a logic value of 1, and when a DVD player decodes a DVD signal, it continuously compares the DVD sign...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/12
Inventor 颜光裕
Owner REALTEK SEMICON CORP