[CQ-Contest] Filter???????

[Eric Scace K3NA]

I vaguely recall reading about some psycho-acoustic effects involving 
listening to sources that are not straight ahead (i.e., equal to both 
ears).  The brain exercises some biological form of signal correlation 
that takes advantage of phase and power differences when a source is 
somewhat off to the side... helping one pick out the interesting 
information from the background.  This is a partial explanation of the 
"cocktail party effect", in which one listens in on a distant 
conversation of interest despite many other things happening in the 
immediate vicinity.  For some reason this is harder to do if the source 
is straight ahead.

Maybe someone with access to the audiology research world can fill in 
more details.

-- Eric K3NA

on 07 Jan 14 Sun 15:19 Robert Chudek - KØRC said the following:
> Tony,
>
> I am not an acoustic engineer... but I will speculate the higher audio frequencies (noise) do not have as much energy content so they attenuate more quickly. Reminds me of the kids 1-KW audio amps in their cars now-a-days, you can hear the thumping bass a mile down the road.
>
> 73 de Bob - KØRC in MN
>
>
> Message: 4
> Date: Sun, 14 Jan 2007 08:10:39 -0500
> From: "Tony Rogozinski" <trogo at telegraphy.com>
> Subject: [CQ-Contest] Filter???????
> To: <cq-contest at contesting.com>
> Message-ID: <01dd01c737dd$634e1470$05000100 at yourbe71e130be>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I've noticed something for years and just wonder if anyone else has the same experience?  This morning I was copying OH6AH on 40M LP but he was pretty weak and the background noise made it a little difficult.  The speaker was on and I needed to go downstairs to get something - as I descended the stairs it seemed like a filter was switched in by my brain and all the background noise went away leaving only the signal.  Just like a nifty audio filter.  In years gone by I have noticed this many times but never asked anyone about the phenomenon.  In Arizona I would be working in the yard maybe 100' away from the shack, the window would be open and radio on and I could copy weak signals without any problem.
>
> Comments?????
>
> Tony W4OI/HK1AR
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