Data tracking clock recovery system having media speed variation

Details Data tracking clock recovery system having media speed variation Data tracking clock recovery system having media speed variation

1986-09-29

1987-09-15

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 10, 331 17, 331 23, 331 25, 375120, H03L 708

Patent

active

046942599

ABSTRACT:
A clock recovery and data separator system of the type described in U.S. Pat. No. 4,456,890 is improved by the inclusion of a detector for detecting the trend of instantaneous media speed variation (ISV). The system includes a phase locked loop in which the ISV trend detector is placed between the output of the phase detector and the input of an up/down counter whose output is passed through a digital to analog converter to control the VCO. The ISV trend detector provides a signal which partially compensates phase shift, thereby permitting rapid data recovery performance.

REFERENCES:
patent: 4144489 (1979-03-01), Ward et al.
patent: 4380742 (1983-04-01), Hart
patent: 4456890 (1984-06-01), Carickhoff

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