MODFILTERBANK - Modulation filter bank

Usage

[outsig, mfc] = modfilterbank(insig,fs,fc);

Input parameters

`insig`	Input signal(s)
`fs`	Sampling rate in Hz,
`fc`	Center frequencies of the input signals

Output parameters

`outsig`	Modulation filtered signals
`mfc`	Center frequencies of the modulation filters.

Description

modfilterbank(insig,fs,fc) applies a modulation filterbank to the input signals insig which are sampled with a frequency of fs Hz. Each column in insig is assumed to be bandpass filtered with a center frequency stored in fc.

By default, the modulation filters will have center frequencies \(0,5,10,16.6,27.77,...\) where each next center frequency is 5/3 times the previous one. For modulation frequencies below (and including) 10 Hz, the real value of the filters are returned, and for higher modulation center frequencies, the absolute value (the envelope) is returned.

References:

T. Dau, B. Kollmeier, and A. Kohlrausch. Modeling auditory processing of amplitude modulation. I. Detection and masking with narrow-band carriers. J. Acoust. Soc. Am., 102:2892-2905, 1997a.