On 14.11.2010 03:40, Mathieu Bouchard wrote:
On Sat, 13 Nov 2010, Mathieu Bouchard wrote:
On Wed, 10 Nov 2010, - wrote:
haut-parleur-doppler.pd is the original file from Martin,
[...]
Please correct me if I'm wrong somewhere.
Yes, that file is from me and not from Martin. (but that's just a few
kilometres off)
(Doh, I was thinking about a different Martin. In any case, the file
comes from me.)
thought you were joking...
in your previous mail you wrote
It remains consonant to the ear so easily simply because it only
produces harmonics.
did you speak about the "doppler" distortion? true doppler distortion is
harmonic for a single sine wave, but not for 2 or more sines of
different frequencies. It's the same effect known as frequency
modulation, in this case a signal being its own carrier. The difficulty
in prediction of a spectrum is that the carrier is an always changing
mix of frequencies and not a single sine wave like for a radio station
transmitter or in the most simplest case of frequency modulation
synthesizers, but it is pretty easy to find out it is non harmonic by
listening...
I want to add that the vd~ approach is not the "perfect implementation"
for the above described frequency modulatuon. the carrier is delayed
against the modulating signal a bit. Like this it simulates a moving
listener instead a moving sound source. Also for a single sine wave the
change of the spectrum differs by variation of the delay.
A more close to reality simulation which does only fm without delay
requires a variable (interpolating?) write into the delayline.
Unfortunately I don't know of such externals already existing. However I
don't expect the effects being very different from the vd~ method. A
slow 20Hz sinewave modulating some high frequencies will not sound very
different if the 20Hz is delayed or not. A 20 hz sound will have a
duration which is much longer that the delay.
Martin
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