Japanese Patent JPH0374335

B2

A defect detecting apparatus for a disc comprises a first dropout selecting circuit for producing a first dropout detection signal having a predetermined pulse width in accordance with the human eyesight, a second dropout selecting circuit for producing a second dropout detection signal which is obtained by detecting a dropout in a vicinity of a beginning of a reproduced vertical synchronizing signal, an angle detecting circuit for generating an angle detection signal indicative of angular positions on the disc where the first and second dropout detection signals are generated with respect to a reference position which is related to the reference signal, a clog detecting circuit for generating a clog detection signal, a compensating circuit for compensating a value of an address signal which is separated from a signal which is reproduced from the disc in a reproducing apparatus, a processing circuit for performing a first process of discriminating the existence of a tracking error, a second process of discriminating an existence of a clog, and a third process of discriminating the existence of an interval in which a dropout exists, and at least an output device for storing or displaying a processed result from the processing circuit.

JP10888283A

November 26, 1991

June 16, 1983

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G01R31/00; G01N27/24; G07C3/14; G11B7/0037; G11B9/06; G11B19/04; G11B20/02; G11B20/18; G11B27/10; G11B27/36; G11B33/10; H04N17/06

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