Methods and apparatus for connecting and conditioning audio sign

Details Methods and apparatus for connecting and conditioning audio sign Methods and apparatus for connecting and conditioning audio sign

1993-06-07

1996-05-14

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381120, 333 32, H04B 1500

Patent

active

055175724

ABSTRACT:
Audio signal connection and conditioning circuitry employs a resistive drop across the ground input for the signal source to generate a common mode voltage on both input lines. A differential amplifier subtracts the generated common mode voltage on the ground line from the common mode voltage on the source input line, leaving only the source voltage as an output. The differential amplifier output is generated with respect to a positive, stable voltage reference instead of a floating ground.

REFERENCES:
patent: 4243839 (1981-01-01), Takahashi et al.
patent: 4386378 (1983-05-01), Guisinger
patent: 5146506 (1992-09-01), Sasaki
Horst Zander, "Zur Unterdruckung von Gleichtaktignalen", Fernseh and Kino Technik, vol. 37, No. 9, Sep., 1983, Berlin, Germany, pp. 368-374.
IC Op-Amp Cookbook, Walter G. Jung, Second Edition First Printing--1980, pp. 36-39.

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