On 26/07/2017 18:33, Michael Black wrote:
On Wed, 26 Jul 2017, Gareth's Downstairs Computer wrote:

Intrigued by the possibility of Binaural reception, where
audio filtering passes lo frequencies to the left ear
and higher ones to the right, causing the tuning of
a CW signal to move in front of your eyes, and musing
that headphones today are invariably stereo, and that
LM386 audio amps are as cheap as chips, that it should
be a feature of receivers to have two audio amps for the
stereo effect with the splitting filters before either of them,
and that those wishing speaker output might just as well
use the audio amps sold for computer use, and now that
the 100 miniature roller-operated microswitches have
arrived from China it is time to get on with the
"vapourware" 50 years RX project, if anything, just
to spite / spike one of M3OSN's guns?

(C) Copyright 2017 The Impossibly Long Sentence Co Ltd :-)


There was a guy with a last name of Hildreth who wrote a number of
articles on this sort of thing in Ham Radio magazine in the seventies.
Used active filters, but he also did some other things.

Receivers with phasing adapters could be modified so you could listen to
one sideband in one ear, and the other sideband in the other ear, that
apparently gave some interesting effects.

They guy who's written a lot in recent times in QST about the phasing
method, a string of projects, one was in effect a phasing receiver
except no audio phasing network. So he had two mixers, fed from an
oscillator with quadrature output, and then each of the mixers fed one
of side of stereo headphones. That apparently gave some nice depth effect.

Michael

Also discussed in Pat Hawkers Technical Topics column, long ago, whe I
was a G8..
Dave
G4UGM