Band-limited adaptive feedback canceller for hearing aids

Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit

Reexamination Certificate

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C381S083000, C381S093000, C381S320000

Reexamination Certificate

active

07965854

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.

REFERENCES:
patent: 5016280 (1991-05-01), Engebretson et al.
patent: 5091952 (1992-02-01), Williamson et al.
patent: 5142552 (1992-08-01), Tzeng et al.
patent: 5201006 (1993-04-01), Weinrich
patent: 5259033 (1993-11-01), Goodings et al.
patent: 5402496 (1995-03-01), Soli et al.
patent: 5550923 (1996-08-01), Hotvet
patent: 5748752 (1998-05-01), Reames
patent: 5768398 (1998-06-01), Janse et al.
patent: 5910994 (1999-06-01), Lane et al.
patent: 6876751 (2005-04-01), Gao
patent: 2004/0101147 (2004-05-01), Arndt et al.
patent: 2004/0125966 (2004-07-01), Weidner
patent: 0 579 152 (1994-01-01), None
patent: 2 274 372 (1994-07-01), None
patent: WO 96/35314 (1996-11-01), None
Agnew, “Application of a Notch Filter To Reduce Acoustic Feedback,” The Hearing Journal, vol. 46, No. 3, Mar. 1993, pp. 37-43.
Bustamante, et al., “Measurement and Adaptive Suppression of Acoustic Feedback in Hearing Aids,” IEEE Publication, pp. 2017-2020.1989.
Dyrlund, et al., Acoustic Feedback Margin Improvements in Hearing Instruments Using a Prototype DFS (Digital Feedback Suppression) System, Scand. Audio. 20, pp. 49-53, 1991.
Egolf, et al., “The Hearing aid Feedback Path: Mathematical Simulations and Experimental Verification,” J. Acoust. Soc. Am. 78 (5), pp. 1578-1587, Nov. 1985.
Egolf, et al., “Simulating the Open-Loop Transfer Function as a Means for Understanding Acoustic Feedback in Hearing Aids,” J. Acoust. Soc. Am. 85 (1), pp. 454-467, Jan. 1989.
Engebretson, et al., “Adaptive Feedback Stabilization of Hearing Aids,” Scand. Audiol. Suppl. 38, pp. 56-64, 1993.
Engebretson, et al., “Properties of an Adaptive Feedback Equalization Algorithm,” J. Rehab. Res. and Dev., Dept. of Vet. Affairs, vol. 30, No. 1, 1993, pp. 8-16.
Estermann, et al., “Feedback Cancellation in Hearing Aids: Results from Using Frequency-Domain Adaptive Filters,” Inst. for Signal and Info. Processing, pp. 257-260, 1994.
Joson, et al., “Adaptive Feedback Cancellation with Frequency Compression for Hearing Aids,” J. Acoust. Soc. Am., 94 (6), pp. 3248-3254, Dec. 1993.
Kates, James M., “Feedback Cancellation in Hearing Aids: Results From a Computer Simulation,” IEEE Trans. on Signal Processing, vol. 39, No. 3, pp. 553-562, Mar. 1991.
Maxwell et al., “Reducing Acoustic Feedback in Hearing Aids,” IEEE Transactions on Signal Processing, vol. 3, No. 4, pp. 304-315, Jul. 1995.
Wang et al., “Acoustic Feedback Cancellation in Hearing Aids,” IEEE Publication, pp. 137-140, 1993.

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