Arrangement for reproducing n digital signals having n phase-loc

Details Arrangement for reproducing n digital signals having n phase-loc Arrangement for reproducing n digital signals having n phase-loc

1997-02-11

1998-07-28

Tran, Thang V.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 63, G11B 509, G11B 1512

Patent

active

057869537

ABSTRACT:
For clock extraction (Cl.sub.n) from n digital signals read from each of n tracks (T.sub.a.1 to T.sub.a.n), there are provided n phase-locked loops (13,n). Voltage-controlled oscillator (21) is common to the n phase-locked loops. Each phase-locked loop further includes a phase-shifter unit (25.n) having an input coupled to the output of the voltage-controlled oscillator (21) and an output coupled to the second input of the phase comparator (17,n) in the loop. The phase shift in the phase-shifter unit (25.n) is controlled under the influence of a control signal which is derived by a control signal generator (26.n) and applied to a control signal input (29) of the phase-shifter unit (25.n). The control signal generator unit (26.n) is an integrating element.

REFERENCES:
patent: 4470082 (1984-09-01), Van Pelt et al.
patent: 5206769 (1993-04-01), Bailey et al.
patent: 5293275 (1994-03-01), Kawasaki
patent: 5488516 (1996-01-01), Kalfs

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