Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1980-11-06
1983-05-31
Truhe, J. V.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318329, 318617, H02P 506
Patent
active
043863000
ABSTRACT:
Apparatus for maintaining a constant linear velocity for a PCM disc record which includes a detector for optically detecting the PCM signal on the record and supplies the output to a differentiating circuit and a rectifier circuit with the output of the rectifier circuit supplied to a peak detector circuit which supplies its output to a level comparator that also receives a reference level from a reference source. A first phase comparator also receives the output of the rectifier circuit and controls a voltage controlled oscillator through a low pass filter and the output of the voltage controlled oscillator is supplied to the phase comparator. A divider receives the output of the voltage controlled oscillator and supplies a first input to a phase comparator which also receives an input from a reference frequency generator. The outputs of the level comparator and the phase comparator are supplied to the motor drive circuit which controls the drive motor for the disc record.
REFERENCES:
patent: 3986089 (1976-10-01), Sword et al.
patent: 4079942 (1978-03-01), Kunen
patent: 4227133 (1980-10-01), Imamura
patent: 4232257 (1980-11-01), Harshberger, Jr.
patent: 4280082 (1981-07-01), Acharya et al.
patent: 4301395 (1981-11-01), Furuhata et al.
Moose Richard M.
Sony Corporation
Truhe J. V.
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