Brian Howie wrote on 7/26/2017 8:09 AM:
In message , Gareth's Downstairs Computer
writes
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 :-)



We discussed this last year. I had some limited success using Spectrumlab
software but hit problems with tuning latency.

SM0VPO has a circuit for a hardware version here.

Http://www.sm0vpo.com/ under Morse Code, Stereo CW

That's what happens when you try to use a PC to do an MCU's job! Dedicated
hardware is pretty mundane. This should be a pretty simple task on fairly
minimal hardware. Filtering software is not too complex. A single FIR
filter can be used to generate one channel, say the low pass, then the high
pass can be found by subtracting that from the original signal.

This could be extended to work with a surround sound speaker arrangement and
achieve 360 degree separation of signals. Audio processing on MCUs is not
at all over taxing these days. A Raspberry Pi would be a great platform to
at least test out the concept and allow 100% COTS hardware.

--

Rick C