Record disc playing apparatus having the function for correcting

Details Record disc playing apparatus having the function for correcting Record disc playing apparatus having the function for correcting

1982-07-29

1983-11-15

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Mechanism condition or storage medium responsive control

369239, 369267, G11B 1700, G11B 1924

Patent

active

044160062

ABSTRACT:
A record disc playing apparatus comprises an address signal generating unit for generating address signals corresponding to horizontal rotational angular positions of a tone arm, a device for generating a rotational angular velocity signal corresponding to the rotational angular velocity of the tone arm, a circuit for controlling the rotation of a motor for driving a turntable, a control device supplied with the address signals and having a memory device from which is from which read out information corresponding to the addresses indicated by the address signals, and an attenuation circuit supplied with the rotational angular velocity signal and operating with an attenuation quantity, with respect to the rotational angular velocity signal, which quantity is varied by a signal from the control device. The rotational angular velocity signal corresponds to the quantity of any eccentricity of the record disc. The control device producing as output signals based on the information thus read out. The attenuation circuit supplying an output signal to the control device. The rotation of the motor is so controlled that a rotational irregularity due to any eccentricity of the record disc is corrected for.

REFERENCES:
patent: 3689079 (1972-09-01), Matsuda et al.
patent: 3937476 (1976-02-01), Sakai
patent: 4123779 (1978-10-01), Goldschmidt
patent: 4138121 (1979-02-01), Nakajima et al.
patent: 4184688 (1980-01-01), Omura et al.

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