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Methods for identifying erroneous detection of pre-pit synchronization bit on optical disc and identifying stability/instability of pre-pit synchronization bit detection, and electric circuits therefor
Methods for identifying erroneous detection of pre-pit synchronization bit on optical disc and identifying stability/instability of pre-pit synchronization bit detection, and electric circuits therefor
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机译:用于识别光盘上的预坑同步位的错误检测并识别预坑同步位检测的稳定性/不稳定性的方法及其电路
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摘要
For each sync frame, an AND circuit detects whether a pre-pit synchronization signal can be obtained within a window set by a timing generator. Detection result of the AND circuit is held by a shift register, where it is shifted in response to each sync frame. On the basis of a parallel output from the shift register, a decoder determines whether the detection of the pre-pit synchronization signal is accurate or erroneous. Count value of a counter is incremented by one each time the decoder determines that the detection of the pre-pit synchronization signal is accurate, but is decremented by one each time the decoder determines that the detection of the pre-pit synchronization signal is erroneous. Identification section identifies stability/instability of the pre-pit synchronization signal detection.
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