Hello.
Le 11/09/2019 à 00:26, Andrew Lyons a écrit :
Sounds like you want spatialization on a plane through 8 speakers
positioned on a circle?
So you need to convert any cartesian locations to polar coords first.
For an approximate 3D sound effect you really only need a function to
create distance (and Doppler?) effects, and then feed that output, and
the angle into the planner.
The Doppler effects are the trickiest obviously. Last time I checked,
real time pitch shifting as a function of change in distance was best
done in the Fourier domain. Not sure how real time that is these days.
Distance effects are just inverse square of distance (or 1/ d^1.5
according to some). Then add filters for high and low frequencies.
Constant power panning and variants popular and easy for speakers on a
circle.
When soundwaves are propagating through a medium, there are several
effects happening, like dispersion and reflexion, and they may travel at
different speeds with same frequency following it's shear modulus (see
https://en.m.wikipedia.org/wiki/Speed_of_sound). That's how ambisonic
tools might be usefull...
Doppler effect is involved when the source of a sound and the listener
are moving relative to each other.
There's pseudo code in this book from memory: Dodge, Charles; Jerse,
Thomas A. 1997 Computer music : synthesis, composition,
and performance. 2nd ed. New York : Schirmer Books ; London : Prentice
Hall International.
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