Frequency Response Fluctuations in Rooms

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Abstract
The frequency irregularity of a steady‐state transmission curve is defined as the sum of the differences, in decibels, between adjacent peaks and valleys divided by the frequency interval over which the summation is made. An approximate theory of frequency irregularity for arbitrarily selected speaker and microphone positions in rectangular rooms is presented. Experimental curves of frequency irregularity vs. frequency and absorption are given for three small rooms (V<2500 cu. ft.). Comparison of these results with theoretical curves shows reasonable agreement for rectangular rooms. In particular, a predicted frequency region of maximum irregularity is observed. The frequency irregularity observed for an irregularly shaped room is significantly lower than that for a rectangular room of comparable volume throughout the region of maximum roughness.

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