Reference signal detection circuit in a rotary recording medium

Details Reference signal detection circuit in a rotary recording medium Reference signal detection circuit in a rotary recording medium

1981-10-13

1984-02-21

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369 50, 358342, G11B 2110

Patent

active

044334028

ABSTRACT:
A reference signal detection circuit in a rotary recording medium reproducing apparatus has a reproducing transducer for reproducing an information signal recorded in a rotary recording medium and reference signals for tracking servo recorded for every predetermined period, from the rotary recording medium rotating at a predetermined rotational speed, and a tracking servo circuit for obtaining a tracking servo signal from the reference signals and performing a tracking servo operation according to the tracking servo signal thus obtained. The detection circuit further comprises a single rectifying and smoothing circuit for rectifying and smoothing the reproduced reference signals obtained for every predetermined period. The detection circuit has a lowpass filter characteristic wherein the cutoff frequency is within a frequency range between one third and twice the gain crossover frequency of the tracking servo loop.

REFERENCES:
patent: 3985952 (1976-10-01), Adler
patent: 4063287 (1977-12-01), van Rosmalen
patent: 4190859 (1980-02-01), Kinjo
patent: 4223187 (1980-09-01), Yonezawa
patent: 4247741 (1981-01-01), Tatsuguchi
patent: 4310912 (1982-01-01), Kikuchi

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