THE AUDITORY MODELING TOOLBOX
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GFB_ANALYZER_NEW - Construct new analyzer object
Usage
analyzer = gfb_analyzer_new(fs,flow, basef, fhigh,filters_per_ERBaud,gamma_order,bandwidth_factor)
Input parameters
| fs | The sampling frequency of the signals on which the analyzer will operate |
| flow | The lowest possible center frequency of a contained gammatone filter |
| basef | "base frequency". One of the gammatone filters of the analyzer will have this center frequency. Must be >= flow |
| fhigh | The highest possible center frequency of a contained gammatone filter. Must be >= basef |
| filters_per_ERBaud | |
| The density of gammatone filters on the ERB scale. | |
| gamma_order | The order of the gammatone filters in this filterbank. If unspecified, the default value from gfb_set_constants.m is used. |
| 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 value is 1.0 |
Output parameters
| analyzer | The constructed gfb_analyzer object. |
Description
gfb_analyzer_new constructs a new gfb_analyzer object. The analyzer implements the analysis part of a gammatone filterbank as described in Hohmann (2002).
It consists of several all-pole gammatone filters; each one with a bandwidth of 1 ERBaud (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).
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