Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2005-01-11
2005-01-11
Shingleton, Michael B. (Department: 2817)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S120000, C381S111000, C381S123000, C330S267000, C330S296000, C330S273000
Reexamination Certificate
active
06842525
ABSTRACT:
An amplification circuit is provided for the signal output from a microphone in which the signal is amplified by a differential structure amplifier. The circuit includes the pull-up voltage, which initializes the operating state of the microphone, being coupled to a first input of the differential structure amplifier and to a second input of the differential structure amplifier through a pull-up resistor.
REFERENCES:
patent: 5543759 (1996-08-01), Comeau, II et al.
patent: 5577129 (1996-11-01), Ehara
Hayt, Jr. “Engineering Circuit Analysis” Third Edition McGraw Hill 1978 p. 51.
Jorgenson Lisa K.
Shingleton Michael B.
STMicroelectronics SA
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