Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1993-09-17
1997-07-22
Kuntz, Curtis
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 684, 395 235, H04R 2500
Patent
active
056510713
ABSTRACT:
In this invention noise in a binaural hearing aid is reduced by analyzing the left and right digital audio signals to produce left and right signal frequency domain vectors and thereafter using digital signal encoding techniques to produce a noise reduction gain vector. The gain vector can then be multiplied against the left and right signal vectors to produce a noise reduced left and right signal vector. The cues used in the digital encoding techniques include directionality, short term amplitude deviation from long term average, and pitch. In addition, a multidimensional gain function based on directionality estimate and amplitude deviation estimate is used that is more effective in noise reduction than simply summing the noise reduction results of directionality alone and amplitude deviations alone. As further features of the invention, the noise reduction is scaled based on pitch-estimates and based on voice detection.
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Lindemann Eric
Melanson John Laurence
AudioLogic, Inc.
Knearl Homer L.
Kuntz Curtis
Le Huyen D.
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