1990-09-21
1993-03-16
Beausoliel, Robert W.
Excavating
371 59, G06F 1100
Patent
active
051950944
ABSTRACT:
An optical disk apparatus comprises an optical disk driver for optically recording data to be recorded on an optical disk and optically reproducing recorded data, a RESYNC detecting circuit for detecting a RESYNC code from data reproduced by the optical disk driver, a control circuit for detecting error data occurring due to the erroneous detection of the RESYNC code by the RESYNC detecting circuit and restarting a reproducing operation upon detection of the error data, and a phase inverting circuit for inverting the phase of reproduction data in response to the error detection and outputting phase-inverted reproduction data to the control circuit for an error check. A RESNYC detecting circuit 14 can detect an invalid RESNYC signal by monitoring and comparing binary signal intervals (A1-A5) and reversed signal intervals (B1-B5) as shown in FIG. 3. The relationships between the intervals are as follows: A1 is not equal to B1, A2 is not equal to B2, A3 is not equal to B3, and A4 is not equal to B4; however, A5 equals B5. The RESNYC detecting circuit 14 determines whether the input RESNYC signal is a valid RESYNC code by monitoring the interval between the falling edges of the non-reversed video signal and the falling edges of the reversed video signal.
REFERENCES:
patent: 4458349 (1984-07-01), Aichelmann, Jr. et al.
patent: 4797872 (1989-01-01), Rokutan
Beausoliel Robert W.
Kabushiki Kaisha Toshiba
Lo Allen M.
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