Note
Click here <sphx_glr_download_auto_examples_gammatone.py> to download the full example code
sphx-glr-example-title
Example of the use of the class ~brian2hears.Gammatone available in the library. It implements a fitlerbank of IIR gammatone filters as described in Slaney, M., 1993, "An Efficient Implementation of the Patterson-Holdsworth Auditory Filter Bank". Apple Computer Technical Report #35. In this example, a white noise is filtered by a gammatone filterbank and the resulting cochleogram is plotted.
from brian2 import *
from brian2hears import *
from matplotlib import pyplot
sound = whitenoise(100*ms).ramp()
sound.level = 50*dB
nbr_center_frequencies = 50
b1 = 1.019 #factor determining the time constant of the filters
#center frequencies with a spacing following an ERB scale
center_frequencies = erbspace(100*Hz, 1000*Hz, nbr_center_frequencies)
gammatone = Gammatone(sound, center_frequencies, b=b1)
gt_mon = gammatone.process()
figure()
imshow(gt_mon.T, aspect='auto', origin='lower left',
extent=(0, sound.duration/ms,
center_frequencies[0]/Hz, center_frequencies[-1]/Hz))
pyplot.yscale('log')
title('Cochleogram')
ylabel('Frequency (Hz)')
xlabel('Time (ms)')
show()sphx-glr-timing
Total running time of the script: ( 0 minutes 0.526 seconds)
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