[Speex-dev] VAD CPU usage

Jozsef Vass jozsef_vass at yahoo.com
Tue Apr 15 19:48:35 PDT 2008

Hi Jean-Marc

I am using speex in my voip app (wideband mode). I
have noticed that when VAD kicks in, CPU considerably
increases (bitrate decreases to 4 kbps). It takes
about 7 ms to encode one frame versus 0.5 ms (for
speech). This happens regardless preprocessor is used.

Although the issue seems to be driver dependent, it
occurs on XP, Vista and Mac OS X.

Besides complexity and quality, this is the only
parameter set for encoder.

We use the latest released version, 1.2beta3.

Are you aware of any possible problem in VAD?



Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

More information about the Speex-dev mailing list