Digital phase-locked loop filter

Details Digital phase-locked loop filter Digital phase-locked loop filter

1987-12-16

1989-03-28

Dobeck, Benjamin

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318327, 331 1A, H02P 500

Patent

active

048167223

ABSTRACT:
A phase-locked loop filter applicable to a motor speed control of an optical disk apparatus and others counts a difference in phase between an input signal to a phase-locked loop and an output signal of the loop, integrates the resulting counts modulo a predetermined value which is dependent upon the period of a clock, produces an overflow signal every time an overflow occurs, and generates the output signal by dividing the frequency of the overflow signal.

REFERENCES:
patent: 3843914 (1974-10-01), Carlson et al.
patent: 4019153 (1977-04-01), Cox et al.
patent: 4242619 (1980-12-01), Nakamura et al.
patent: 4271382 (1981-06-01), Maeda et al.
patent: 4272712 (1981-06-01), Beling et al.
patent: 4283671 (1981-08-01), Nakano et al.
patent: 4355266 (1982-10-01), Pearson

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