Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit
Reexamination Certificate
2007-11-06
2007-11-06
Ni, Suhan (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Noise compensation circuit
C381S083000, C381S093000, C381S320000
Reexamination Certificate
active
11089399
ABSTRACT:
An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all unstable frequencies. By limiting the bandwidth of the feedback cancellation signal, the distortion due to the adaptive filter is minimized and limited only to the unstable feedback regions. A relatively simple signal processing algorithm is used to produce highly effective results with minimal signal distortion.
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Chi Hsiang-Feg
Gao Shawn X.
Soli Sigfrid D.
Blakely , Sokoloff, Taylor & Zafman LLP
House Ear Institute
Ni Suhan
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