Optical disk phase lock loop with comb filter

Details Optical disk phase lock loop with comb filter Optical disk phase lock loop with comb filter

1987-05-21

1988-04-26

McElheny, Jr., Donald

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 47, 369124, 375 76, G11B 700

Patent

active

047409444

ABSTRACT:
The read signal input to the phase lock loop, which tracks the prerecorded clock of an optical disk digital recording and playback system, is first filtered using a comb filter to reduce effects caused by the loss of the prerecorded clock signal due to data holes which erase the prerecorded clock and cause relatively large and long lasting, unipotential read signals.

REFERENCES:
patent: 3947636 (1976-03-01), Edgar
patent: 4168496 (1979-09-01), Lichtblau
patent: 4250453 (1981-02-01), Nilsson
patent: 4414586 (1983-11-01), Hirota et al.
patent: 4509155 (1985-04-01), Masuda et al.
patent: 4641324 (1987-02-01), Karsh et al.
patent: 4646281 (1987-02-01), Verboom
Cackowski et al., "Pulse Detector", IBM Tech. Disc. Bul., vol. 7, No. 5, Oct. 1964, pp. 344-345.

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