Abstract
“Fluttering” is the transient vibration excited by short sound pulses between two parallel walls. To an observer near one of the walls, the flutter echoes always sound as if they originate from the farther wall. In this paper the phenomenon of fluttering is considered theoretically both by the normal mode technique and by the method of geometrical acoustics. Both methods predict a series of multiple echoes. This is verified experimentally by taking the oscillogram of the flutter echoes. The directional effect of the fluttering is explained by psychological reasons.
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