Patent ID: 6768979
Filing Date: 2004-07-27
Classification: F16J,G10L,G11B

Abstract:
An apparatus for noise attenuation in an electronic system, comprising:a noise suppressor configured to selectively attenuate additive noise in an electronic signal, said electronic signal being a noisy speech signal that includes a noise signal combined with a speech signal, said noise suppressor selectively attenuating said noise signal by utilizing statistical characteristics of amplitude energy values of said noise signal, said statistical characteristics of said amplitude energy values of said noise signal include a noise average and a noise standard deviation, said noise suppressor generating an attenuated noisy speech signal according to a formula: Yatk=Yk1+Ae-12&it;â€ƒ&it;(Yk-Î±&it;â€ƒ&it;Î¼kÏƒk)2if&it;â€ƒ&it;Yk>Î±&it;â€ƒ&it;Î¼kYatk=Yk1+Aotherwiseâ€ƒwhere Yatk is said attenuated noisy speech signal for a frequency k, Yk is said noisy speech signal for said frequency k, &mgr;k is said noise average for said frequency k, &sgr;k is said noise standard deviation for said frequency k, &agr; is a overestimation coefficient, and A is an attenuation coefficient; and a processor coupled to said electronic system to control said noise suppressor.