Quote:
Originally Posted by seancostello  Variable speed of sound, due to temperature variations within a large space. A small amount of temperature variation in different places within a hall, or moving air currents, will cause very small random pitch changes of the reflections. Multiply this by a few orders of reflections, and you can have a fairly significant spread of frequencies over time. |
According to Dr. Blesser's citation in his "artificial Reverberation" paper , the speed of sound varies due to thermal currents at an (average) equivalence to 2ms at a rate of 0.2hz.
If you want to simulate this effect you need to tailor your randomization to resemble wind! The largest DSP hogs in my reverb algos are the randomizers....