Excavating
Patent
1993-09-08
1994-09-13
Beausoliel, Jr., Robert W.
Excavating
371 471, 360 51, 360 26, G06F 1100, H04L 1200, G11B 509
Patent
active
053475178
ABSTRACT:
An information processing apparatus having the function of reproducing digital information recorded on a recording medium has binarizing circuit for transforming a reproduction signal read from the recording medium into a binary signal, circuit for making from the binary signal a bit synchronous signal for use when the binary signal is demodulated, circuit for detecting the inverted portion of the binary signal by a periodical window of a predetermined period and producing a synchronous binary signal synchronized with the bit synchronous signal in accordance with the result of the detection, demodulating circuit for demodulating the digital information on the recording medium on the basis of the synchronous binary signal, and circuit for varying the period of the window in conformity with the situation.
According to the above method, any small defect likely to develop into an error in the future is effectively detected to thereby obviate such a situation that the detection of a synchronous pattern becomes impossible or the reproduction of data becomes impossible.
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IBM Technical Disclosure Bulletin, Read Time Pulse Selection Apparatus, A. R. Harrison et al., vol. 5, No. 7, Dec. 1962, pp. 70-72.
Satomura Seiichiro
Takeshita Kano
Beausoliel, Jr. Robert W.
Canon Kabushiki Kaisha
Tu Trinh L.
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