Tracking control for a tape using pilot signals

Details Tracking control for a tape using pilot signals Tracking control for a tape using pilot signals

1986-07-28

1989-03-28

Faber, Alan

Dynamic magnetic information storage or retrieval

Record editing

360 7305, 360 7714, G11B 5584

Patent

active

048169307

ABSTRACT:
A circuit for reproducing informaiton signals and four different tracking control pilot signals recorded on respective tracks on a magnetic tape and producing from the pilot signals a tracking error signal indicative of a relative positional deviation between each of a plurality of magnetic heads and each track of the tape. The circuit includes a balanced modulation circuit for successively multiplying reproductions of the pilot signals and a reference signal to produce a multiplication output signal having components corresponding to the respective pilot signals. Respective tuning circuits derive first and second signals from the multiplication output signal, having different frequency components and corresponding to different ones of the pilot signals. A level comparison circuit compares the first and second signals in level to produce a level-compared output signal whose value is indicative of the relative levels of the first and second signals, the level-compared output signal having respective portions corresponding to successive periods of reproducing signals on tracks on which different ones of the pilot signals are recorded. A further portion of this circuit time-divisionally extracts the values of levels of the level-compared output signal. A further comparator calculates the values of the differences between at least two of the extracted level values to produce the tracking error signal. The circuitry eliminates any variations in the tracking error signal which may be caused by any variations in mechanical height of the magnetic heads.

REFERENCES:
patent: 4587580 (1986-05-01), Takayama et al.
patent: 4594615 (1986-06-01), Nemoto et al.
patent: 4630146 (1986-12-01), Takayama et al.
patent: 4658309 (1987-04-01), Yasuda et al.

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