Condenser microphone

Details Condenser microphone Condenser microphone

1979-07-11

1981-07-28

Brown, Thomas W.

179 1F, H03F 134, H04R 300, H04R 1900

Patent

active

042812216

ABSTRACT:
An electroacoustic transducer comprises a condenser of variable capacitance, responsive to acoustic waves impinging upon its plates, connected across a source of d-c voltage in a circuit of negligible ohmic resistance by way of two reactive impedance elements with reactances of equal frequency-dependent magnitude and opposite sign, specifically a positive and a negative capacitance, in series with each other. The negative-capacitance element is formed by an ancillary capacitor in the output of an impedance-inverting four-terminal network including an operational amplifier with resistive feedback. The output signal is taken off across one of the two series-connected impedance elements.

REFERENCES:
patent: 3116366 (1963-12-01), Seligson
patent: 3190972 (1965-06-01), Schoeps et al.
patent: 3393271 (1968-07-01), Fidi et al.
patent: 3913024 (1975-10-01), Necoechea

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