System for controlling positions of record tracks relative to a

Details System for controlling positions of record tracks relative to a System for controlling positions of record tracks relative to a

1990-12-18

1993-07-27

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 101, G11B 1928

Patent

active

052315479

ABSTRACT:
A system is provided for controlling positions of record tracks relative to a scanning trace of a head device. An envelope detector detects an envelope of an output from a head device operative to scan a record tape along a scanning path transverse to record tracks. A pulse generator produces two pulses appearing respectively at predetermined time points in a period of a scanning trace of the head device. A level sampler samples a level of a detection output from the envelope detector with the pulses produced by the pulse generator to produce two sampled outputs. An improper position detector detects improper positioning of a group of record tracks traversed by the head device relative to the scanning trace of the head device based on a difference between the sampled outputs from the level sampler. A tape controller adjusts a travelling speed of the record tape to control positions of the record tracks traversed by the head device relative to the scanning trace of the head device in response to a detection output from the improper position detecting circuit.

REFERENCES:
patent: 4104684 (1978-08-01), Wakami et al.
patent: 4338631 (1982-07-01), Ota
patent: 5003406 (1991-03-01), Hatanaka et al.
patent: 5119246 (1992-06-01), Tomitaka
Patent Abstracts of Japan, Hayamizu Atsushi, "Tracking Control Signal Generator", Mar. 24, 1987.
8087 IEEE Trans. on Consumer Electronics, vol. CE-26, No. 1, Feb., 1980, "Microprocessor Controlled Variable Play-Back Speed System for Video Tape Recorder", Nobuo Azuma et al., pp. 121-128.

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