THE AUDITORY MODELING TOOLBOX

Applies to version: 0.9.7

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DEMO_HOHMANN2002 - Filterbank example

Description

This example program demonstrates how to create and use an analysis gammatone filterbank. It seems to implement Hohmann (2002).

This code produces the following output:

Building a filterbank for 16276Hz sampling frequency.
Lower cutoff frequency: 70Hz
Upper cutoff frequency: 6700Hz
Base frequency        : 1000Hz
filters per ERB       : 1

filterbank contains 30 filters:
 # |     f / Hz  |  normalization |     coefficient

  1|   73.223641 |   5.265982e-08 | 0.986867 + 0.027903i
  2|  107.651956 |   8.085647e-08 | 0.984969 + 0.040957i
  3|  146.004401 |   1.241101e-07 | 0.982654 + 0.055445i
  4|  188.728245 |   1.904318e-07 | 0.979828 + 0.071514i
  5|  236.321739 |   2.920749e-07 | 0.976374 + 0.089322i
  6|  289.339925 |   4.477658e-07 | 0.972152 + 0.109040i
  7|  348.401107 |   6.860992e-07 | 0.966986 + 0.130846i
  8|  414.194064 |   1.050696e-06 | 0.960665 + 0.154929i
  9|  487.486082 |   1.608029e-06 | 0.952929 + 0.181478i
 10|  569.131901 |   2.459271e-06 | 0.943462 + 0.210687i
 11|  660.083684 |   3.758199e-06 | 0.931880 + 0.242737i
 12|  761.402124 |   5.738207e-06 | 0.917721 + 0.277794i
 13|  874.268807 |   8.752923e-06 | 0.900427 + 0.315986i
 14| 1000.000000 |   1.333716e-05 | 0.879330 + 0.357389i
 15| 1140.061995 |   2.029808e-05 | 0.853641 + 0.401992i
 16| 1296.088211 |   3.085102e-05 | 0.822431 + 0.449661i
 17| 1469.898248 |   4.682124e-05 | 0.784622 + 0.500088i
 18| 1663.519097 |   7.094204e-05 | 0.738989 + 0.552724i
 19| 1879.208790 |   1.072934e-04 | 0.684168 + 0.606690i
 20| 2119.482727 |   1.619433e-04 | 0.618693 + 0.660680i
 21| 2387.143012 |   2.438807e-04 | 0.541066 + 0.712827i
 22| 2685.311132 |   3.663608e-04 | 0.449888 + 0.760566i
 23| 3017.464361 |   5.488321e-04 | 0.344054 + 0.800486i
 24| 3387.476311 |   8.196695e-04 | 0.223067 + 0.828203i
 25| 3799.662107 |   1.220009e-03 | 0.087477 + 0.838291i
 26| 4258.828711 |   1.809067e-03 | -0.060519 + 0.824359i
 27| 4770.330980 |   2.671403e-03 | -0.216318 + 0.779363i
 28| 5340.134118 |   3.926697e-03 | -0.372053 + 0.696340i
 29| 5974.883239 |   5.742619e-03 | -0.515783 + 0.569724i
 30| 6681.980865 |   8.351410e-03 | -0.631053 + 0.397471i

Figure 1 shows the frequency response of the individual filters.

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