Stereo expansion selection switch

Details Stereo expansion selection switch Stereo expansion selection switch

1991-04-30

1993-05-04

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307571, 381 18, H04S 500, H03K 17687

Patent

active

052084930

ABSTRACT:
A stereo expansion circuit has right and left amplifying channels for providing expanded stereo signals. A selection device comprises a switch cross coupling the signal channels for providing expanded stereo when the switch is closed. Circuitry is provided for preventing the switching control signal from being coupled to the signal channels. More specifically, a version of a signal coupled between the signal channels through the conduction channel of the switch is applied to the control input of the switch to inhibit the control signal from being coupled to the conduction channel. Such an arrangement is particularly advantageous when the switch comprises a J-FET.

REFERENCES:
patent: 3448293 (1969-06-01), Russell
patent: 3646364 (1972-02-01), Kaminski
patent: 3731116 (1973-05-01), Hill
patent: 3902078 (1975-08-01), Peterson
patent: 3908136 (1975-09-01), Desperques-Volmier
patent: 3942039 (1976-03-01), Kikuchi et al.
patent: 3955103 (1976-05-01), Russell et al.
patent: 4323796 (1982-04-01), Lathrope

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