AUDFILTBW Bandwidth of auditory filter
Usage: bw = audfiltbw(fc)
AUDFILTBW(fc) returns the critical bandwidth of the auditory filter
at center frequency fc defined in equivalent rectangular bandwidth.
The function uses the relation:
bw = 24.7 + fc/9.265
as estimated in Glasberg and Moore (1990). This function is also used
when the original ERB scale ('erb83') is chosen.
AUDFILTBW(fc,'bark') returns the critical bandwidth at fc according
to the Bark scale using the relation:
bw = 25 + 75 ( 1+1.4*10^{-6} fc^2 )^0.69
as estimated by Zwicker and Terhardt (1980).
For the scales 'mel', 'mel1000', 'log10' and 'semitone', no critical
bandwidth function is usually given. Following the example of the
equivalent rectangular bandwidth (associated with the ERB scale), we
use the derivative of the inverse of the scale function F_{Scale},
evaluated at F_{Scale}(fc), i.e.
bw = (F_{scale}^{-1})'(F_{scale}(fc))
References:
E. Zwicker and E. Terhardt. Analytical expressions for criticalband
rate and critical bandwidth as a function of frequency. The Journal of
the Acoustical Society of America, 68(5):1523--1525, 1980. [1]http ]
B. R. Glasberg and B. Moore. Derivation of auditory filter shapes from
notched-noise data. Hearing Research, 47(1-2):103, 1990.
References
1. http://scitation.aip.org/content/asa/journal/jasa/68/5/10.1121/1.385079
Url: http://ltfat.github.io/doc/auditory/audfiltbw.html
See also: freqtoerb, erbspace, freqtoaud, audtofreq.
Package: ltfat