Hearing aid comprising adaptive feedback suppression system

Details Hearing aid comprising adaptive feedback suppression system Hearing aid comprising adaptive feedback suppression system

2011-04-26

2011-04-26

Ensey, Brian (Department: 2614)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Noise compensation circuit

C381S318000

Reexamination Certificate

active

07933424

ABSTRACT:
A hearing aid comprises an input transducer (2), a subtraction node for subtracting a feedback cancellation signal from the electrical input signal thereby generating a processor input signal, a signal processor (3), an output transducer (4), a pair of equalization filters (7a,7b) for selecting from the processor input and output signals a plurality of frequency band signals, a frequency equalization unit for frequency equalization for the selected frequency band signals, and an adaptive feedback estimation filter (5, 6) for adaptively deriving the feedback cancellation signal from the equalized frequency band signals. The equalization of selected frequency bands of the input signals of the adaptive feedback cancellation filter provides for an improved and in particular a faster adaption of the feedback cancellation. The invention further provides a method of reducing acoustic feedback of a hearing aid, and a hearing aid circuit.

REFERENCES:
patent: 5991417 (1999-11-01), Topholm
patent: 6097824 (2000-08-01), Lindemann et al.
patent: 2003/0012391 (2003-01-01), Armstrong et al.
patent: 2003/0053647 (2003-03-01), Kates
patent: WO 00/19605 (2000-04-01), None
Philipp A. Regalia, “Adaptive IIR Filtering in Signal processing and Control”, 1995 (Title page).
Bernard Widrow et al, “Adaptive Signal Processing”, 1985 (Title page).
Simon Haykin, “Adaptive Filter Theory”, 1996 (Title page).
Lennart Ljung, “System Identification: Theory for the User”, 1987 (Title page).
Lennart Rad et al, Beta Mathematics Handbook—1990, p. 335.

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