Noise-free switching circuit for and method of electronically se

Details Noise-free switching circuit for and method of electronically se Noise-free switching circuit for and method of electronically se

1978-08-14

1980-11-25

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 307254, 307293, 330124R, H03K 1756

Patent

active

042360889

ABSTRACT:
A noise-free electronic switching circuit selects one of a pair of audio input signals in an audio system. Each input signal is connected by separate conductors to a single output terminal. The output terminals of two transistors are respectively connected between each conductor and ground. When a manually-operated switch is switched to a first operating condition, an exponentially increasing and an exponentially decreasing control voltage are respectively applied to the bases of a first and a second transistor. When the actuating switch is switched to a second operating condition, an exponentially decreasing and an exponentially increasing control voltage are respectively applied to the bases of the first and the second transistor. In either operating condition, one transistor is turned on and the other is turned off. Thus, only the selected audio signal is delivered to the output terminal; and the other non-selected audio signal is shorted to ground before reaching the output terminal. The exponential nature of the control voltages reduces audible noise during switching in accordance with the method of the invention.

REFERENCES:
patent: 2970227 (1961-01-01), Horton et al.
patent: 3196201 (1965-07-01), McDonald
patent: 3207952 (1965-09-01), Brahm
patent: 3472957 (1969-10-01), Kaye et al.
patent: 3550016 (1970-12-01), Gugliotti
patent: 3893038 (1975-07-01), Omata et al.

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