Method for controlling a plurality of phase-lock loops from a co

Details Method for controlling a plurality of phase-lock loops from a co Method for controlling a plurality of phase-lock loops from a co

1992-04-06

1993-04-27

Grimm, Siegfried H.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

331 2, 331 17, 331 46, 360 30, G11B 509, H03L 707, H03L 7093

Patent

active

052067696

ABSTRACT:
In a magnetic tape readback system for a multi-track tape player, a phase lock loop is provided for each of the channel circuits used for reading signals from the respective tracks on a multi-track tape. A common frequency determining capacitor is coupled to all of the phase lock loops such that the frequency of operation of the phase lock loops is stabilized. The capacitor has a capacitance usable in the individual phase lock loops for determining a frequency of operation and it is commonly AC connected to all of the phase lock loops. A capacitance AC couples and DC blocks each of the individual phase lock loops to the frequency determining capacitor such that the individual phase lock loops have their own reference DC levels and yet receive AC input from all of the other phase lock loops.

REFERENCES:
patent: 4433424 (1984-02-01), Taber et al.
patent: 4470082 (1984-09-01), Van Pelt et al.
patent: 4825321 (1989-04-01), Hassel et al.
IBM Technical Disclosure Bulletin vol. 14 No. 3 p. 726 "Frequency Sychronization of Dead Tracked VFC's" Aug. 1971.

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