Rotary head type magnetic tape recording and reproducing apparat

Details Rotary head type magnetic tape recording and reproducing apparat Rotary head type magnetic tape recording and reproducing apparat

1990-08-31

1992-12-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 64, G11B 509

Patent

active

051683962

ABSTRACT:
A coefficient setting circuit sets, in registers, coefficients corresponding to a position of each magnetic heads on a rotary drum. A counter circuit counts the number of pulses of a first reference clock signal employed as a reference signal for rotational control of the rotary drum. Comparison circuits compare the coefficients, set in registers, with a count value of the counter circuit and outputs reset pulses r1 and r2 when a match is detected between the set coefficients and the count value. In response to these reset pulses r1 and r2, counter circuits are reset to start the counting operation of a second reference clock signal. Consequently, decoders output timing pulses for controlling the timing of recording or reproducing operations for each magnetic head. The coefficients set by coefficient setting circuit are altered in accordance with alterations in the position of each magnetic head or the shape of the rotary drum, resulting in appropriate timing pulses.

REFERENCES:
patent: 5051848 (1991-09-01), Ishii et al.
Article from I.E.E.E. Transactions entitled "A New Multi-Functional Digital Servo LSI for Home VCR", Aug. 1987; No. 3, pp. 210-218.
English Abstract of Japanese Laid-Open Patent Appln. 62-266755.
English Abstract of Japanese Laid-Open Patent Appln. 63-121158.
English Abstract of Japanese Laid-Open Patent Appln. 62-209711.

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