Electrical audio signal processing systems and devices – Feedback suppression
Reexamination Certificate
2006-04-24
2011-11-08
Faulk, Devona (Department: 2614)
Electrical audio signal processing systems and devices
Feedback suppression
C381S095000, C381S096000, C381S097000, C381S098000, C381S071600
Reexamination Certificate
active
08054992
ABSTRACT:
A method and apparatus for increasing phase margin in a feedback circuit of an active noise reduction headphone. The method includes providing an acoustic block comprising an acoustic driver comprising a voice coil mechanically coupled along an attachment line to an acoustic energy radiating diaphragm, the acoustic block further comprising a microphone positioned along a line parallel to an intended direction of vibration of the acoustic diaphragm and intersecting the attachment line, the acoustic block characterized by a magnitude frequency response compensating the magnitude frequency response by a compensation pattern that has a positive slope over at least one spectral range above 10 kHz.
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Bose Corporation
Faulk Devona
Monikang George
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