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Re: parabolic T mic and phase invert noise reduction

Subject: Re: parabolic T mic and phase invert noise reduction
From: Walter Knapp <>
Date: Mon, 03 Jan 2005 21:10:34 -0500
From: "Rich Peet" <>

> Yes I need to cut up or replace the support tube so that more of the
> dish is seen by each capsule.  I still want the barrier effect in
> front of the capsules for the sounds way off axis but that support
> tube is a current problem.  I have tested the effect of a full barrier
> on the image and will simply say I personally did not like what I saw
> and heard.  But since you already own the comparitive mics anyway,
> take a look at one channel output from your telinga stereo mic
> compared to the output from the telinga mono mic when they are pointed
> at distant pink noise.  There are plenty of people that find the
> results of the stereo telinga ok.  I just feel it can be improved upon
> with trade offs.

Since it's not all that hard to come in with a front support, I was just 
a little surprised to see such a heavy back support from you as I know 
how anti to barriers you are.

Thank you no on the pink noise. I think in designing a natural audio 
scene pickup that one should do it with natural sound. Pink noise is 
very far from natural, especially steady state pink noise. Imposing that 
on a natural audio scene and then using our own personal cognitive audio 
scene analysis has just too many inconsistencies. That is unless your 
purpose is to design a mic optimized for recording pink noise anomolies 
in natural scenes.

Once you move into stereo, where the purpose is to capture a entire 
audio scene and reconstruct it for a new listener, you can no longer 
ignore what's going on in research on cognitive audio scene analysis. 
Just as soon as you insert your own analysis of that scene into the 
design process, you are in the thick of it.

I trust most using a stereo mic on the audio scenes that I wish to 
record and optimizing the design and usage for that. It is a more time 
consuming process, but the results are better.

Walt




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