Electrical audio signal processing systems and devices – Hearing aids – electrical – Noise compensation circuit
Reexamination Certificate
2008-01-29
2008-01-29
Le, Huyen (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Noise compensation circuit
C381S093000, C381S312000
Reexamination Certificate
active
07324651
ABSTRACT:
Acoustical signals impinging on an input converter are converted into a first electric signal by a controllably variable transfer characteristic. The transfer characteristic is dependent on the angle at which the acoustical signals impinge on the input converter. The first electric signal is processed and a resulting signal is applied to an output converter. Feedback to be suppressed is compensated by a feedback compensating signal, which is generated in dependency of the resulting signal and is fed back by a feedback signal path upstream of the processing. The electric feedback compensating signal is fed back to and superimposed upon the first electric signal. An adaptation rate of the converting into a first electric signal by a controllably variable transfer characteristic is controlled in dependency of the loop gain along the feedback signal path.
REFERENCES:
patent: 5091952 (1992-02-01), Williamson et al.
patent: 6498858 (2002-12-01), Kates
patent: 0 656 737 (1995-06-01), None
patent: 1 080 606 (2001-03-01), None
patent: 00/19605 (2000-04-01), None
patent: 00/33634 (2000-06-01), None
Herbordt W. et al. “Computationally Efficient Frequency-Domain Combination of Acoustic Echo Cancllation and Robust Adaptive Beamforming:” Proceedings Eurospeech, vol. 2, Sep. 2001 pp. 1001-1004, XP 007004503 Aalborg, Danmark.
Hsiang-Feng Chi, Shawn X. Gao, Sigfrid D. Soli, Abeer Alwan: “Band Limited Feedback Cancellation with a Modified Filtered-x LMS Algorithm for Hearing Aids” Speech Communication, vol. 39, No. 1-2, Jan. 2003, pp. 147-161, XP002295470 Elsevier Science.
Maxwell J.A. et al: “Reducing Acoustic Feedback in Hearing Aids” IEEE Transactions on Speech and Audio Processing, IEEE Inc. New York, US, vol. 3, No. 4, Jul. 1, 1995, pp. 304-313, XP 000633074 ISN: 1063-6676.
Hoshuyama O. et al: “A Robust Adaptive Beamformer for Microphone Arrays with A Blocking Matrix Using Constrained Adaptive Filters” IEEE Transactions on Signal Processing, IEEE, Inc. New York, US, vol. 47, No. 10, Oct. 1999, pp. 2677-2684, XP 000947154, ISSN: 1053-587X.
Le Huyen
Pearne & Gordon LLP
Phonak AG
LandOfFree
Feedback suppression does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feedback suppression, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feedback suppression will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2760629