tuneR (version 0.4-2)

fftfreqconvmx: Internal: Convert FFT frequency bins to Bark/Mel bins

Description

Generate a matrix of weights to combine FFT bins into Bark/Mel bins.

Usage

fft2barkmx(nfft, sr = 8000, nfilts = NULL, width = 1, minfreq = 0, 
    maxfreq = sr/2)
    
fft2melmx(nfft, sr = 8000, nfilts = 40, width = 1, minfreq = 0, 
    maxfreq = sr/2, htkmel = FALSE, constamp = FALSE)

Arguments

nfft

Source FFT size.

sr

Sampling rate of the signal.

nfilts

Number of desired output frequency bands. If NULL then one per Bark/Mel between minfreq and maxfreq.

width

Width of each output frequency band in Bark/Mel.

minfreq

Minimum frequency.

maxfreq

Maximum frequency.

htkmel

Use HTK- or Slaney's curve of the Melscale.

constamp

Make integration windows peak at 1 (constamp=TRUE) or sum to 1 (constamp=FALSE)

Value

• wts
  The weight matrix with 'nfft' columns and 'nfilts' rows.
• binfreqs
  Edge frequencies of the bins.

concept

• fft
• frequency
• bark
• mel
• conversion

References

Daniel P. W. Ellis: http://www.ee.columbia.edu/~dpwe/resources/matlab/rastamat/, Malcolm Slaney: Auditory Toolbox http://cobweb.ecn.purdue.edu/~malcolm/interval/1998-010/

See Also

hz2bark, hz2mel

Examples

#Mel matrix in Slaney's mfcc.m:
  #tuneR:::fft2melmx(512, 8000, 40, 1, 133.33, 6855.5, FALSE, FALSE)