Pickup level control device for a system for reading out recorde

Details Pickup level control device for a system for reading out recorde Pickup level control device for a system for reading out recorde

1983-05-31

1985-12-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250209, 369 48, H01J 4014

Patent

active

045582130

ABSTRACT:
A pickup level control device for a system for reading out recorded information which has a pickup element producing a pickup output signal. The device detects a dc component of the pickup output signal and produces a level control signal. A voltage level of the pickup output signal is controlled in response to the level control signal produced by the dc level detection operation. The control of the voltage level of the pickup output signal is performed by a variable impedance element connected to a terminal of the pickup element, so that a peak level of an ac component of the pickup output signal is controlled below a predetermined level.

REFERENCES:
patent: 3581223 (1971-05-01), Armstrong
patent: 4320348 (1982-03-01), Suzuki et al.
patent: 4415803 (1983-11-01), Muoi
patent: 4459475 (1984-07-01), Flint et al.

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