Subject: Audibility of frequency notches From: "David I. Havelock" <david.havelock(at)NRC.CA> Date: Wed, 16 Jan 2002 14:02:11 -0500List 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 david.havelock(at)nrc.ca voice: (613) 993-7661 fax: (613)952-3670 45N27'16" 75E37'26"