Separation band detecting circuit in an automatic program select

Details Separation band detecting circuit in an automatic program select Separation band detecting circuit in an automatic program select

1982-05-13

1984-08-07

Stephan, Steven L.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 33, 369216, 369231, G11B 338, G11B 1706

Patent

active

044647409

ABSTRACT:
A separation band detecting circuit is used in an automatic program selection record player which has a photodetector which moves together with a tone arm and comprises a light-emitting element for emitting light against the surface of the record and a photosensitive element for receiving the light reflected at the record surface and producing an output in accordance with the light quantity of the received reflected light. The detecting circuit comprises an operational amplifier supplied with the output of the photodetector to its one input terminal, and a time constant circuit connected to the other input terminal of said operational amplifier, for giving a threshold level with respect to the operational amplifier and giving a time constant with respect to the level fluctuation in the threshold value. The time constant circuit varies the threshold level with a time constant, according to an input signal level to the one input terminal of the operational amplifier. The operational amplifier inverts its output when the relationship between amplitudes of the input signal level and the threshold level reverses.

REFERENCES:
patent: 4093832 (1978-06-01), Isaacson et al.
patent: 4361880 (1982-11-01), Kitamura et al.
patent: 4375092 (1983-02-01), Yoshio
patent: 4375093 (1983-02-01), Takahashi
patent: 4398278 (1983-08-01), Suzuki
patent: 4412318 (1983-10-01), Goto

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