On Wed, 28 Feb 2001 18:29:34 -0500, "Jim Black" wrote:

>Thanks for the help. I do have two separate audio tracks so isolating the
>speaker audio is simple. I just wish there was a negative echo effect that I
>could run the room audio track through to remove the echo from it.
>
>I'll try the equalizer and noise gate filters but I've had limited success
>with them as the echo is distortion of the audio I want to keep. It is the
>students voices reflected off the room walls and ceiling. It's not a simple
>fixed frequency hum or hiss that can be clipped out.
>
>Has anyone tried Sonic Foundry's Noise Reduction 2 Plug-in? I might be able
>to characterize the distorted audio and subtract it from the sound I want to
>keep???

I have not tried Cool Edit's (cheap and good)
noise-reduction on echoes, but it has saved me
with crowd noise and other high-level background
noises when used judiciously, mixing the noise-reduced
track back with the original to control ill-effects.