Fluctuations of the sound pressure level in rooms when the receiver position is varied
A theoretical description is given of the fluctuations in sound pressure level in rooms when the receiver position is varied, and these are confirmed by experiments. Fluctuations are insensitive to wall shape. Far from the source and for frequencies satisfying Schröder's “large
room” condition r.m.s. deviation of the pressure level from its average value is the same for variation in the source or receiver position as it is for variation of the source frequency, namely, 5.5 dB. Near to the source, or at lower frequencies, the size and shape of a typical fluctuation
depend upon the source radiation characteristic, the reverberation time, the room volume and the type of eigenfunctions (axial, tangential or transverse) predominant among those with eigenfrequencies near the driving frequency.
Document Type: Research Article
Publication date: 01 January 1959
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