Reproducing apparatus for a disc type record medium

Details Reproducing apparatus for a disc type record medium Reproducing apparatus for a disc type record medium

1973-12-17

1976-02-10

Aegerter, Richard E.

Undertaking

274 1R, 274 1F, 274 23R, 318311, G11B 1700, G11B 360, H02K 2720, H02P 700

Patent

active

039374769

ABSTRACT:
A sound reproducing apparatus includes a device for producing an output signal proportional to the rotary angle of a rotary shaft which rotates in association with the pickup arm of a phonograph apparatus, and includes a motor speed control circuit for driving a turntable in response to the output signal and a reference signal which is determined from monitoring the position of the sound track on a disc record. The postion detecting device is able to detect the amount of eccentricity of the disc record or the spindle of the turntable and the invention improves the wow characteristics of phonograph apparatus caused by eccentricity.

REFERENCES:
patent: 2113226 (1938-04-01), Young
patent: 3105692 (1963-10-01), Berggren
patent: 3319965 (1967-05-01), Wolf
patent: 3503615 (1970-03-01), Matsuda

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