Electrical audio signal processing systems and devices – Feedback suppression
Patent
1995-08-07
1998-02-10
Kuntz, Curtis
Electrical audio signal processing systems and devices
Feedback suppression
381 83, 381 96, H04B 1500
Patent
active
057177724
ABSTRACT:
Acoustic feedback is removed from an audio signal (50) by digitizing the audio signal (50) to produce a digitized audio signal (54). The digitized audio signal (54) is then filtered with an adaptive bandpass filter (56) to detect the frequency of the acoustic feedback, where the adaptive bandpass falter (56) is aligned with the feedback based on a phase relationship between the input and the output of the adaptive bandpass filter (56). A notch filter (58) is then configured based on the frequency of the acoustic feedback, and the digitized audio signal (54) is filtered with the notch filter (58) to attenuate the feedback. The feedback-attenuated digitized signal (62) is converted to a feedback-attenuated analog signal (70).
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Choe Johnny
Hoory Dan
Lane John E.
Kuntz Curtis
Lee Ping W.
Motorola Inc.
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