[TenTec] Adding Binaural CW to Ten-Tec transceivers

[Jerry Volpe]

Jeff Kelly wrote:

>Multipsk has a binaural feature in their software.  Couldn't get it working too good though.  Perhaps my pc wasn't fast enough.  Any other DSP programs have this feature?
>
>Jeff
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I looked at Multipsk as a result of a search on all the DSP/soundcard 
programs I could find. Yes, it indicates that it has the ability. This 
is strickly my opinion but this software has the worst User Interface 
that I have expereinced in a long time. Certainly not intuitive. Also as 
it is 'deriving' the binaural experience via software/DSP there is going 
to be a definite delay in what goes it to what comes out. This delay can 
be somewhat problematic with CW, expecially if you want to use QSK. 
Lastly, it is terrible overkill for a problem that has such an 
elegant/simple solution. At least that is my thinking and why I went the 
way I went.

Jeff, please note that I decided to try this as an experiment. I found 
that my late night operating required headphone operation to keep the 
peace in the family. The more I listeded with cans the more I noticed 
the 'hum' and general muddiness generated from a non-spacial audio 
presentation. It is absolutely amazing how much difference takes place 
just separating the low frequency and high frequency components. 
Background nose just seems to drop out in significance while the station 
more or less pops into presence. If you have ever been an avid music 
listener via home stereo recall what happens when you switch from mono 
to stereo... how pleasant and comfortable the spacial sound stage is.... 
the vocalist is in front of you and the instruments to the left and 
right... etc., etc... Now recall what happened if your speakers where 
out-of-phase... how disorienting the listening experience became. There 
were separate sounds but they just didn't have a focus. Anyway, the 
Binaural CW audio filter builds a simulated sound stage effectifvely due 
to the less compicated nature of a CW audio signal (as compared to a 
musical instrument of the human voice). It works. I have noticed some 
effect when listening to SSB as well but that is anedotal I suppose. 
Generally you would need a much more complex spacial synthesis system 
for voice. NOT what this was about. :)

Jerry, KG6TT