Detection circuit for detecting synchronous and asynchronous sta

Details Detection circuit for detecting synchronous and asynchronous sta Detection circuit for detecting synchronous and asynchronous sta

1983-05-20

1985-11-26

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 20, 331DIG2, 358 17, 358 20, H03L 700, H03L 710, H04N 946

Patent

active

045556792

ABSTRACT:
The output of a phase comparator in the PLL of the data reproduction unit is filtered to remove low frequency components which may be due to record eccentricity. The filtered output is then rectified and integrated, with the level of the integrated signal determining whether the PLL should be operated in a broad or narrow band state.

REFERENCES:
patent: 2962666 (1960-11-01), Pollack
patent: 3078421 (1963-02-01), Heuer et al.
patent: 3796962 (1974-03-01), Hekimian
patent: 3873766 (1975-03-01), Maeda
patent: 4000476 (1976-12-01), Walker et al.
patent: 4015287 (1977-03-01), Hovens
patent: 4232393 (1980-11-01), Kumaoka et al.
patent: 4426627 (1984-01-01), Yoshisato et al.

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