Electrical audio signal processing systems and devices – Directive circuits for microphones
Reexamination Certificate
2006-09-26
2006-09-26
Grier, Laura A. (Department: 2615)
Electrical audio signal processing systems and devices
Directive circuits for microphones
C381S097000, C381S104000, C381S312000
Reexamination Certificate
active
07113604
ABSTRACT:
An apparatus is provided for matching the response of a pair of microphones. The two microphones provide a first and second output, respectively, in response to an audible input. The microphone outputs are subtract from each other to produce a gain control output for operably controlling the gain of the first microphone output, resulting in a gain compensated microphone output. A phase adjustment circuit also is provided responsive to the gain compensated microphone output and a rolloff control output for producing a matching output. The rolloff control output is generated by a phase difference subtractor circuit responsive to both the matching output and the second microphone output. Moreover, the output of at least one of the microphones has a resonance frequency that is shifted to a desired preselected frequency.
REFERENCES:
patent: 4412097 (1983-10-01), Ishigaki et al.
patent: 4420655 (1983-12-01), Suzuki
patent: 4509022 (1985-04-01), Ridel
patent: 4622440 (1986-11-01), Slavin
patent: 4718099 (1988-01-01), Hotvet
patent: 5978490 (1999-11-01), Choi et al.
patent: 6035049 (2000-03-01), Engh et al.
patent: 6389142 (2002-05-01), Hagen et al.
patent: 6421448 (2002-07-01), Arndt et al.
patent: 6654468 (2003-11-01), Thompson
patent: 0 509 742 (1992-10-01), None
patent: 59-64994 (1984-04-01), None
Grier Laura A.
Knowles Electronics LLC.
Marshall & Gerstein & Borun LLP
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