<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7226.0"> <TITLE>Voice Activity Detection Improvement</TITLE> </HEAD> <BODY> <!-- Converted from text/rtf format --> <P><FONT SIZE=2 FACE="Arial">Is there anybody know why function speex_compute_vad() has input parameters<I> mean_prior</I> and<I> mean_post</I> but did not use them in the implementation? I found out that Speex VAD does not perform well at low SNR situation, but if I add a<I> mean_prior</I> test on top of the existing Speex VAD test, it will prevent a lot of noise packets to be classified as speech packets.</FONT></P> <P><FONT SIZE=2 FACE="Arial">Lisa</FONT> </P> </BODY> </HTML>