Digital capstan servo circuit

Details Digital capstan servo circuit Digital capstan servo circuit

1983-09-21

1985-02-19

Weldon, Ulysses

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 318326, 318329, G05B 500

Patent

active

045008221

ABSTRACT:
A digital capstan servo circuit controls the rotation of a capstan motor used for sending a recording medium of a recording apparatus having a recording circuit for recording a plurality of pilot signals instead of CTL signals used for a tracking servo of the capstan motor in a reproducing mode. The pilot signals have different frequencies respectively and are recorded under being mixed with a video signal on video tracks. In the recording mode, a rotation speed information obtained from a counter of which a counting value is latched by a latch pulse produced from FG signals which are generated synchronously with the capstan motor and a rotation phase information obtained from the counter of which a counting value is latched by a latch pulse produced from an oscillator, an output signal of the oscillator having the same frequency as that of but a different phase from as that of the FG signals, are mixed to be a control signal of the capstan motor.

REFERENCES:
patent: 3331006 (1967-07-01), Strand et al.
patent: 3548318 (1970-12-01), Yorksie
patent: 4061950 (1977-12-01), Kayanuma
patent: 4216419 (1980-08-01), Van Dam et al.
patent: 4242619 (1980-12-01), Nakamura et al.
patent: 4254367 (1981-03-01), Sakamoto

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