[Elecraft] Left ear / right ear or stereo

[Brendon Whateley]

Yes, this is available in general aviation by audio panels like the Garman
350c which offers what they call 3D audio. That allows you to set up
different sources to appear to come from different locations or seats in
the cabin. PS Engineering offers something in the PDA 360EX called
IntelliAudio, which interestingly they license from the US Air Force, where
pilots apparently call it multi-talker.

This seems to be a relatively simple DSP process to recreate. It looks like
you take your various sound sources and process them through a head-related
transfer function based on the desired source location. The HRTF change the
sound fed to each ear based on time delay, frequency dependant shadowing
caused by the head, etc.

While I was looking into this beyond the aviation side, I found evidence
that the first recordings using the binaural technology took place in 1881!

It has also been in use in video games since the '90s. And there are a lot
of software products out there to create these effects for performances,
recordings, etc.

The best use cases are utilizing many different sources which get located
around the listener, whereas in HAM we have a single source, or at least
multiple sources which are coming through a small funnel. I can imagine you
could locate signals based on frequency from left to right. Or with 3+
receivers, you could locate signals by direction and distance. It sounds
like an interesting place to experiment.

Regards,
- Brendon
KK6AYI


On Wed, Mar 6, 2019 at 7:59 AM Andy Durbin <a.durbin at msn.com> wrote:

> It seems to be common to refer to using one ear for main RX and the other
> ear for Sub RX as "Stereo".   I have experimented with listening to more
> than one radio using stereo headphones and found the experience far from
> satisfactory.   My application was listening to Air Traffic Control and
> parachute demo ground coordinator with different ears.
>
> Some time ago NASA did some research on presenting multiple radios in a
> true stereo "sound stage".  With suitable processing each receiver could be
> placed anywhere in that sound stage, not just in the left ear or in the
> right ear.  The sound stage could also be used to place passengers in the
> appropriate place when they spoke on intercom.
>
> I learned about this  project during a visit to Langley but have not heard
> if there was any commercial development of the idea.  Anyone know if there
> has been any commercial application either for aircraft radios or for
> amateur radio?
>
> 73,
> Andy, k3wyc
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