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Originally Posted by Froombosch  Correct. On the other side we are using modulation to decorrelate the reflections. This has no equivalent in normal hall reflections. Maybe moving walls  |
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.