JOERGENSEN2011_MULTCHANSNRENV - calculates the SNRenv

Usage:

result =  joergensen2011_multChanSNRenv(signal,test,noise,fs,N,T)

`signal`	clean input signal
`test`	distorted signal (by noise, reverb etc.)
`noise`	noise signal, processed in the same way as the test signal
`fs`	sampling frequency
`N`	Number of samples in the input signals
`T`	Duration in seconds of the input signals

result

struct containing the results

joergensen2011_multChanSNRenv calculates the SNRenv in 7 modulation filters in 22 Gammatone filters with 1/3-octave spacing.

The result struct contains the following fields:

`.mod_fcs`	Center frequencies of the modulation filterbank
`.outSNRenvs`	Matrix with an SNRenv value for each modulation filter in each gammatone filter;
`.sEPSM_ExcPtns`
	(Optional) Modulation excitation patterns