"Bob Cain" wrote in message
...


Porky wrote:

I finally figured out why I can't sing on pitch, it's doppler
distortion!
When I try to sing, subsonic millihertz vibrations in my vocal chords
cause
the audible notes to be shifted in pitch, and since my eardrums are
subject
to the same millihertz vibrations, they are in motional phase with my
vocal
chords, the result being that I don't hear the variations in pitch until
I
play back the recording. Yeah, that's the ticket, I'll blame it all on
Doppler! *LOL*
Thanks guys, for inspiring such a novel, rational sounding excuse for
why
I can't sing!:-)

That's a truly brilliant rationalization, Porky. Just
remember that anything that must be rationalized is highly
unlikely to be rational. :-)


I agree with that, and I wonder how much else in this discussion comes
from rationalization.
It occurs to me that anything so hard to test and measure, even to the
point of proving that it exists at all, is so likely to be absolutely
inconsequential in its effects in the real world that it doesn't really rate
more than a note in passing, especially when real world speakers have so
many other flaws that can be quantized, measured, and even heard by
virtually anyone who bothers to listen and compare.
Virtually all involved in this discussion have made good points that seem
both logical and valid, but as I see it, everyone is basing their logic on
one or another assumption. If one assumes that complex music can actually be
broken down into a group of pure tones and a loudspeaker works by
reproducing all those tones individually, then yes, Doppler distortion
should exist in the output. Conversely, if one assumes that the complex
music waveform is reproduced as a gestalt by the loudspeaker, then no,
Doppler distortion is not likely be introduced by the speaker. It would seem
that the physics allow for both positions, as well as any combination of the
two, so I don't think the discussion is likely to be settled here, unless
someone can come up with a way to test for Doppler distortion in a
loudspeaker that everyone will agree is a valid test, and let those who have
access to the appropriate test equipment run the test(s) and publish their
results to these groups.
So, anyone want to describe a test procedure that can be done with
equipment that at least some of us are likely to have access to, and see if
everyone will agree that it's valid and that it will measure Doppler
distortion while excluding any other form of distortion that could be
mistaken for Doppler?