[TriLUG] VOIP soft phone help.

[Joseph Mack NA3T]

On Sat, 18 Aug 2012, Thomas Gardner wrote:

> Thanks, Joe.  One that's one less thing for me to worry about.
> You think I'll have to worry about echo (from multiple microphones
> picking up the same person talking at slightly different times due
> to their slightly different distance to the source), or do you think
> a similar happenstance will probably take care of that, too?

I expect you'll get echo. Maybe you could have one mike 
capture the input channel and mute the others. I don't say 
this is easy.

You asked if you could cancell the TV etc. Noise cancelling 
headphones work by having the cancelling mike physically 
close to the speaker in the headphones. I expect you can 
only cancel for frequencies for which the phase difference 
is small, ie for frequencies below where

lambda/4 > distance from mike to speaker headphone

Joe

-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
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