Method and apparatus for detecting and processing synchronizatio

Details Method and apparatus for detecting and processing synchronizatio Method and apparatus for detecting and processing synchronizatio

1993-09-27

1994-11-08

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 50, 369 54, 369124, G11B 700

Patent

active

053633601

ABSTRACT:
A method and apparatus for detecting and processing synchronization marks extracted from a prerecorded wobbled groove formed in a compact disk in order to produce pseudo-sync signals. The method comprises the steps of: i) extracting an FM signal from the wobbled groove and converting such FM signal into biphase data; ii) extracting a clock signal from the biphase data; iii) detecting in each block of information a predetermined sequence of biphase data representing a sync mark to produce a sync detect signal; iv) generating a time window signal in which, in each block of information, a valid sync detect signal is expected to occur; v) in response to a valid sync detect signal detected within the window signal of a given block of information, generating a pseudo-sync signal in the next block of information; vi) in the case of no valid sync detect signal within the window signal of the given block of information, generating a pseudo-sync signal for the next block of information from the last valid sync detect signal; and vii) indicating a system error when a predetermined number of sync detect signals are not detected within their corresponding time window signal.

REFERENCES:
patent: 4620300 (1986-10-01), Ogawa
patent: 4908812 (1990-03-01), Aoshima et al.
patent: 4947264 (1990-08-01), Narusawa
patent: 5274622 (1993-12-01), Kono

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