Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1992-07-13
1995-03-28
Kuntz, Curtis
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
381 71, H04B 1500
Patent
active
054024960
ABSTRACT:
A noise and feedback suppression apparatus processes an audio input signal having both a desired component and an undesired component. When implemented so as to effect noise cancellation, the apparatus includes a first filter operatively coupled to the input signal. The first filter generates a focused reference signal by selectively passing an audio spectrum of the input signal which primarily contains the undesired component. The reference signal is supplied to an adaptive filter disposed to filter the input signal so as to provide an adaptive filter output signal. A combining network subtracts the adaptive filter output signal from the input signal to create an error signal. The noise suppression apparatus further includes a second filter for selectively passing to the adaptive filter an audio spectrum of the error signal substantially encompassing the spectrum of the undesired component of the input signal. This cancellation effectively removes the undesired component from the input signal without substantially affecting the desired component of the input signal. When the present apparatus is implemented so as to suppress feedback the adaptive filter output signal is employed to cancel a feedback component from the input signal.
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Buckley Kevin M.
Soli Sigfrid D.
Widin Gregory P.
Bauer William D.
Griswold Gary L.
Kirn Walter N.
Kuntz Curtis
Lee Ping W.
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