Phase-locked loop control for reading data off storage media

Details Phase-locked loop control for reading data off storage media Phase-locked loop control for reading data off storage media

1988-04-20

1990-02-13

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 25, 360 51, H03L 714

Patent

active

049010352

ABSTRACT:
An improved phase-locked loop control having a phase detector receptive of a data preamble of all "ones" from a storage sub-system for producing early and late signals to a voltage controlled oscillator in order for the frequency of the oscillator to be synchronized with the frequency of the data. A pattern detector senses the incoming preamble pulses and prevents the generation of the early and late signals when a preamble pulse is not present within a predetermined window of time.

REFERENCES:
patent: 4068198 (1978-01-01), Otto
patent: 4135163 (1979-01-01), Kosel
patent: 4360781 (1982-11-01), Sochor
patent: 4583053 (1986-04-01), Yarborough, Jr.

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