New Post: Speex Echo Cancellation with NAudio?

I could fix the problem. It was all about frame length.

Now it works great. Just there's a problem. I can say that it works great with win7(I have totally no any echo). But with win XP, it doesn't work stable. It just reduces the echo a little and it shows strange behavior(like it works for some seconds and some seconds not). It's like a sample rate difference between input and output sound or something like this.

Is there any difference between win xp and win 7 in their audio device handling?

Any idea?