Feedback elimination method and apparatus

Details Feedback elimination method and apparatus Feedback elimination method and apparatus

2005-03-31

2010-06-22

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

Feedback suppression

C381S066000, C381S083000, C381S096000, C381S094100, C381S094200, C381S094300, C379S406010, C379S406120

Reexamination Certificate

active

07742608

ABSTRACT:
A method and apparatus for detecting a singing frequency in a signal processing system using two neural-networks is disclosed. The first one (a hit neural network) monitors the maximum spectral peak FFT bin as it changes with time. The second one (change neural network) monitors the monotonic increasing behavior. The inputs to the neural-networks are the maximum spectral magnitude bin and its rate of change in time. The output is an indication whether howling is likely to occur and the corresponding singing frequency. Once the singing frequency is identified, it can be suppressed using any one of many available techniques such as notch filters. Several improvements of the base method or apparatus are also disclosed, where additional neural networks are used to detect more than one singing frequency.

REFERENCES:
patent: 5263019 (1993-11-01), Chu
patent: 7133529 (2006-11-01), Ura
patent: 7187778 (2007-03-01), Basseas
patent: 7190800 (2007-03-01), Terada et al.
patent: 2003/0210797 (2003-11-01), Kreifeldt et al.

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