Yes, it's long been well known that real audio waveforms are
asymmetrical. WAY back in the '50s, AM broadcasters used a device that
constantly monitored the waveform and constantly flipped the polarity to
keep the hottest peak so that it increased instantaneous TX power.
That's because with AM, distortion is created at carrier cutoff. I
remember building a negative peak clipper circuit back in the '50s.
Here's an AES paper by R A Greiner (and probably one of his EE students)
that studied the audibility of absolute polarity (that is, the same
polarity in the playback system as in the recording system).
http://www.aes.org/e-lib/browse.cfm?elib=6950 Several recording and
sound engineers who were members of a professional organization called
SynAudCon demonstrated that they could accurately tell by listening
whether the polarity of a system was correct.
Note that we're NOT talking about polarity difference between channels
of a stereo recording.
73, Jim K9YC
On 9/14/2018 2:13 PM, Bob McGraw K4TAX wrote:
From my AM broadcast days and my pro audio days, yes it is not unusual
to find that a given mike has more positive output than negative
output in terms of the voltage waveform.
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