Resolver with sequential frequency and phase correction

Details Resolver with sequential frequency and phase correction Resolver with sequential frequency and phase correction

1983-03-11

1985-09-10

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 13, 369 47, 318314, 318317, 318318, G11B 1552, G11B 2700

Patent

active

045410232

ABSTRACT:
Apparatus for adjusting the speed of an audio tape capstan to a speed such that an audio tone prerecorded on the tape corresponds to a reference frequency, the apparatus thereafter phase locking the frequency of the audio tone to the reference frequency. The apparatus stores a signal corresponding to the last tape speed utilized even after the tape has stopped, allowing for faster phase lock after the tape has started again. Logic circuitry determines the presence of a valid tape audio tone, and means are included for adjusting the system gain to substantially reduce any wow or flutter which normally would result from damaged or spliced tape. A phase adjust knob is provided to allow for offset of the phase locked condition if necessary. The apparatus includes a pair of frequency-to-voltage converters which provide an essentially ripple-free DC voltage output while permitting a response time of only a few cycles of a relatively low (typically 60 Hertz) input frequency.

REFERENCES:
patent: 3441342 (1969-04-01), Ball et al.
patent: 3778693 (1973-12-01), Korteling
patent: 3787615 (1974-01-01), Foerster et al.
patent: 3828234 (1974-08-01), Goldberg
patent: 4271382 (1981-06-01), Maeda et al.
patent: 4301395 (1981-11-01), Furuhata et al.
patent: 4338640 (1982-07-01), Yabu et al.

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