Perform critical band analysis (see PLP), which means the reduction of the
fourier frequencies of a signal's powerspectrum to a reduced number of frequency
bands in an auditory frequency scale.
Matrix with the auditory spectrum of each time frame in its columns.
wts
Weight matrix for the frequency band conversion.
Arguments
pspectrum
Output of powspec, matrix with the powerspectrum of each time frame in its columns.
sr
Sample rate of the original recording.
nfilts
Number of filters/frequency bins in the auditory frequency scale.
fbtype
Used auditory frequency scale.
minfreq
Lowest frequency.
maxfreq
Highest frequency.
sumpower
If sumpower = TRUE, the frequency scale transformation is based on the
powerspectrum, if sumpower = FALSE, it is based on its squareroot (absolute value of the spectrum) and
squared afterwards.