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How fractional octave (e.g. 1/12) smoothing is done in REW? Is it by a Butterworth filter or brick wall filter?
 

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IEC 61260 applies to the filters used for time signals, typically impulse responses - e.g. before calculating octave and third-octave RT60 figures. There doesn't appear to be any standard for the filter shape to be used in the frequency domain fractional octave smoothing filters.
 
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