Patent ID: 8577676
Filing Date: 2013-11-05
Classification: G10L,H04R,H04S

Abstract:
1. A method of improving audibility of speech in a multi-channel audio signal, comprising: receiving the multi-channel audio signal, wherein the multi-channel audio signal includes a left channel, a right channel, a left surround channel, a right surround channel, and a center channel, wherein the center channel contains speech audio, and wherein the left channel, the right channel, the left surround channel, and the right surround channel contain non-speech audio; comparing a power spectrum of the left channel and a power spectrum of the center channel to generate a left attenuation factor, wherein the power spectrum of the left channel is generated by a first N-band power estimator as a first multiband power spectrum having N bands, wherein N is greater than one; comparing a power spectrum of the right channel and the power spectrum of the center channel to generate a right attenuation factor, wherein the power spectrum of the right channel is generated by a second N-band power estimator as a second multiband power spectrum having N bands; comparing a power level of the left surround channel and a power level of the center channel to generate a left surround attenuation factor, wherein the power level of the left surround channel is generated over the left surround channel considered as a single band; comparing a power level of the right surround channel and the power level of the center channel to generate a right surround attenuation factor, wherein the power level of the right surround channel is generated over the right surround channel considered as a single band; adjusting the left attenuation factor, the right attenuation factor, the left surround attenuation factor, and the right surround attenuation factor according to a speech likelihood value to generate an adjusted left attenuation factor, an adjusted right attenuation factor, an adjusted left surround attenuation factor, and an adjusted right surround attenuation factor; and attenuating the left channel using the adjusted left attenuation factor, the right channel using the adjusted right attenuation factor, the left surround channel using the adjusted left surround attenuation factor, and the right surround channel using the adjusted right surround attenuation factor.