Flutter compensator with variable oscillator

Details Flutter compensator with variable oscillator Flutter compensator with variable oscillator

1980-07-07

1981-12-29

Gellner, Michael L.

Optics: motion pictures

With sound accompaniment

Methods

352 14, 352 17, 352 25, 352 92, G03B 2150, G03B 3102

Patent

active

043079466

ABSTRACT:
Flutter in an audio signal recorded on a magnetic tape is reduced by sampling the audio at a rate determined by the frequency of a reference signal also recorded on the tape, reading the samples into respective cells of a memory, and reading out respective cells of the memory at a substantially constant rate that is independent of rapidly changing short duration variations in tape speed. The read-out rate is isolated from tape speed by introducing a time delay between the read-in and read-out of the same sample, the amount of the delay changing in accordance with differences in speed between the tape and a fixed reference. Changes in the delay between read-in and read-out of the same sample generate an error signal that is used to control the speed of the capstan motor that drives the tape past a transducer.

REFERENCES:
patent: 3832045 (1974-08-01), Wilson et al.
patent: 3838447 (1974-09-01), Wray
patent: 3850513 (1974-11-01), Wray

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