Patent ID: 6535844
Filing Date: 2003-03-18
Classification: G10L

Abstract:
A method of detecting silence in a packetized voice communication system, comprising the steps of:calculating a total energy value FEn for each packet of voice and calculating therefrom a smoothed energy value SEn as follows: if(FEn>SE(nâˆ’1)) then SEn=FEn, else SEn=A*SE(nâˆ’1)+B*FEn, wherein A and B are predetermined multiplication factors; calculating a noise value for said voice communication system during periods of said silence; detecting one of either presence or absence of fricatives in said packet of voice; establishing a silence ceiling value and a silence floor value; and comparing said smoothed energy value to said noise value and said silence ceiling and silence floor values and in the event of an absence of fricatives and said smoothed energy value is intermediate said silence ceiling and silence floor values and is less than said noise value then indicating detection of said silence.