Hi Patricia and anyone else interested,
At the Music Dynamics Lab at University of Connecticut, we have a
MATLAB toolbox for nonlinear oscillator modeling of auditory
processes, but it also has many stimulus generation functions that
can be used for general purposes in addition to usage within the
toolbox. You can acquire the toolbox here:
https://github.com/MusicDynamicsLab/GrFNNToolbox
and add it and its subdirectories to your MATLAB path. You can
read the documentation of the function stimulusMake() to
learn how to generate various types of stimuli. But here is an
example of IRN:
s = stimulusMake(1,'fcn',[0 1],44100,{'noi'},'iter',0.005,5);
The above generates a stimulus structure s with the
relevant fields s.t the time vector, and s.x
the stimulus, with parameters corresponding to a time period of 0
to 1 seconds, 44,100 Hz sampling rate, and a white noise carrier
waveform. The 'iter' attribute then takes two parameters
for iterating the noise carrier: 0.005 corresponding to
an iteration delay of 0.005 seconds (5 ms), and 5
"iterations", or delay and add steps. You can of course adjust all
these parameters to your needs.
Adjusting the iteration delay of course determines the resulting
periodicity of the IRN waveform, with the reciprocal of the delay
in seconds corresponding to the fundamental periodicity frequency
in Hertz, 200 in this case. And the number of iteration steps
determines the narrowness of spectral peaks and resultant pitch
salience, or "pitch strength" as it is referred to in Yost's work.
Hope this is of some help,
Karl
On 3/14/19 10:03 AM, Patricia
Bestelmeyer wrote:
Dear List,
Would anyone be happy to share Matlab
scripts for generating iterated rippled noises? I’d like to be
able to vary the gain, delay and number of ripple iterations
if possible.
Patricia
-------------------------------------------
Patricia
E. G. Bestelmeyer, PhD
School
of Psychology
Bangor
University
Brigantia
Building
LL57
2AS, Bangor, Gwynedd, UK
Phone:
+44 (0)1248 383488
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