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Audibility of frequency notches

List members

A colleague here has been looking for an answer to the following question...

Consider speech with a frequency band removed, such as might be done with an
ideal notch filter. It seems that if the removed band is very narrow then
there is no perceived degradation in the speech. How wide must the removed
frequency band be before a degradation in the speech becomes  noticable?

Is the answer to this known?

David Havelock
David I. Havelock
Acoustics and Signal Processing Group
Institute for Microstructural Sciences, M-36
National Research Council (Canada)
1200 Montreal Road, Ottawa, ON, K1A 0R6
voice: (613) 993-7661   fax: (613)952-3670
45N27'16" 75E37'26"