On Fri,3/10/2017 1:41 AM, David Pruett wrote:
Just about any modern transceiver that has a sub-receiver utilizes
stereo receive audio.
Not quite. They feed two channels of audio to headphones, but those
channels are not "stereo." Stereo is, by definition, the use two or more
microphones in an acoustic environment to receive magnitude, phase, and
time information about sound in that space, and feeding that signal to
two or more loudspeakers or headphones to reproduce the sound in the
original environment, including the spatial location of the sound
sources. In stereo, the PHASE relationships between the two channels is
critical, and far more than the amplitude relationships.
The only way in which we use anything like this in ham radio is
diversity reception, where two receivers are fed by two antennas and we
put one in one ear and one in the other. The amplitude and phase
relationships between the two antennas provide a sound field that can
create a spatial impression and sound a lot like stereo.
When doing SO2R, many of us put the radio on our left to our left ear
and the radio on our right to our right ear, but since those radios are
listening to two different frequencies, it's NOT stereo.
73, Jim K9YC
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