Usage

[outsig, fc] = dau1997_preproc(insig,fs);
[outsig, fc] = dau1997_preproc(insig,fs,...);

Input parameters

dau1997_preproc(insig,fs) computes the internal representation of the signal insig sampled with a frequency of fs Hz.

[outsig,fc,mfc]=dau1997_preproc(...) additionally returns the center frequencies of the filter bank and the center frequencies of the modulation filterbank.

The model consists of the following stages:

1. a gammatone filter bank with 1-erb spaced filtes.
2. an envelope extraction stage done by half-wave rectification followed by low-pass filtering to 1000 Hz.
3. an adaptation stage modelling nerve adaptation by a cascade of 5 loops.
4. a modulation filterbank

Any of the optinal parameters for auditoryfilterbank, ihcenvelope and adaptloop may be optionally specified for this function. They will be passed to the corresponding functions.