The Auditory Modeling Toolbox
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HOHMANN2002 - Construct a new filterbank within the HOHMANN2002 framework
Usage
fb = hohman2002(fs,flow, basef, fhigh,filters_per_ERBaud)
Input parameters
| fs | The sampling frequency of the signals on which the filterbank will operate |
| flow | The lowest center frequency of a filter |
| basef | "base frequency". One of the filters will have exactly this center frequency. Must be >= flow |
| fhigh | The highest center frequency of a filter. Must be >= basef |
| filters_per_ERBaud | |
| The density of gammatone filters on the ERB scale. | |
Output parameters
| fb | The constructed filterbank object. |
hohman2002 constructs a new fb object implementing the analysis part of a gammatone filterbank as described in Hohmann (2002).
fb contains several all-pole gammatone filters; each one with a bandwidth of 1 ERB (optional: times bandwidth_factor), and an order of gamma_order.
The center frequencies of the individual filters are computed as described in section 3 of Hohmann (2002).
hohmann2002 takes the following flags at the end of the line of input arguments:
| 'gamma_order' | The order of the gammatone filters in this filterbank. Default is 4. |
| 'bandwidth_factor' | The bandwidth parameter of the individual filters is calculated from the Equivalent Rectangular Bandwidth (ERB) according to equation 14 in Hohmann (2002). ERB is taken from the Glasberg & Moore formula for a specific center frequency (equation 13 in Hohmann (2002)). Using this parameter, it is possible to widen or narrow all filters of the filterbank with a constant bandwidth factor. Default is 1.0 |
| 'l' | Scaling factor l from Eq. 13 in Hohmann (2002). Default is 24.7. |
| 'q' | Scaling factor q from Eq. 13 in Hohmann (2002). Default is 9.265. |
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