Response to Moore I welcome Brian Moore’s suggested revision of my method for deriving simple triangular approximations of auditory filter shapes (Moore, 1991). In my original report (Formby, 1990) I was primarily concerned with giving the clinician a mathematically simple estimate of filter bandwidth. I elected not to include the additional step of ... Letter to the Editor
Letter to the Editor  |   December 01, 1991
Response to Moore
 
Author Affiliations & Notes
  • C. Formby
    Department of Otolaryngology-Head and Neck Surgery Johns Hopkins University School of Medicine
Article Information
Hearing / Letters to the Editor
Letter to the Editor   |   December 01, 1991
Response to Moore
Journal of Speech, Language, and Hearing Research, December 1991, Vol. 34, 1440-1441. doi:10.1044/jshr.3406.1440
 
Journal of Speech, Language, and Hearing Research, December 1991, Vol. 34, 1440-1441. doi:10.1044/jshr.3406.1440
I welcome Brian Moore’s suggested revision of my method for deriving simple triangular approximations of auditory filter shapes (Moore, 1991). In my original report (Formby, 1990) I was primarily concerned with giving the clinician a mathematically simple estimate of filter bandwidth. I elected not to include the additional step of differentiating the masked threshold function (or the cumulative noise power area function) to derive the more exact auditory filter shape. As I will show below, Moore’s extra derivative step typically changes the estimate of bandwidth relatively little. At the same time, after the slopes of the two sides of the auditory filter shape are corrected per Moore, my method can be shown to have overestimated the peak levels of the filter by a factor proportional to the noise power output of the filter. This correction for the peak levels of the auditory filter shape may be the more important contribution of Moore’s revision of my method.
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