Intel High Definition Audio + Skype - echoing

Hans Petter Selasky hselasky at
Wed Feb 28 16:36:43 UTC 2007


I have some opinions about echo cancelling:

1) Echo cancelling should be part of the kernel.

2) Extremely low sound latency causes the echo canceller to use more CPU! 
Something in the range of 25-50ms is Ok. This is because an efficient echo 
canceller process samples in blocks instead of sample by sample.

Here is the old sample by sample echo canceller that I use with ISDN 

I'm currently working on a new and block based one that will be more 


More information about the freebsd-multimedia mailing list