On 10/2/2012 4:35 AM, Bob McGraw - K4TAX wrote:
In many mike elements the voltage swing from + to - is not equal.
Actually, this is a characteristic not only of the human voice, but also
of some acoustic musical instruments. Back when we both were young
pups, AM broadcasters used polarity flippers in the audio line so that
the hottest side of the waveform was always on top. As I recall, this
was one of Leonard Kahn's ideas. I remember having built a negative
peak clipper for my rig in the late 50s. BTW -- the reason for this is
that distortion is produced by carrier cutoff, but not on the positive
peak. I'm sure you know all this stuff, Bob, but others may not.
73, Jim
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