Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit
Reexamination Certificate
2006-09-12
2006-09-12
Ni, Suhan (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Noise compensation circuit
C381S312000, C381S318000, C381S071120
Reexamination Certificate
active
07106871
ABSTRACT:
A method for canceling feedback in an acoustic system including a microphone, a signal path, a speaker and means for detecting presence of feedback between the speaker and the microphone, the method including providing an LMS algorithm for processing the signal; where the LMS algorithm operates with a predetermined adaptation speed when feedback is not present; where the LMS algorithm operates an adaptation speed faster than the predetermined adaptation speed when feedback is present, and where the means for detecting the presence of feedback is used to control the adaptation speed selection o the LMS algorithm, where the feedback detection means comprises bandwidth detection means for determining the presence of a feedback signal.
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Ekelid Michael
Nielsen Jakob
Dykema Gossett PLLC
Ni Suhan
Oticon A/S
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