hohmann2002_filter(a_tilde,gamma_order); hohmann2002_filter(fs, fc, gamma_order); hohmann2002_filter(fs, fc, gamma_order, bandwidth_factor); hohmann2002_filter(fs, fc, bw, attenuation_db, gamma_order);

- Input arguments:
- a_tilde : Complex-valued filter coefficients fs : Sampling rate (in Hz) fc : Centre frequency (in Hz) bw : Filter bandwidth (in Hz) gamma_order : Gammatone filter order bandwidth_factor : Bandwidth factor with respect to 1 ERB. Default: 1.0

`hohmann2002_filter(a_tilde, gamma_order)` specifies the complex-valued
filter coefficients directly as at the beginning of Sec. 2.3 in Hohmann
(2002).

`hohmann2002_filter(fs, fc, gamma_order)` computes
filter coefficients for sampling rate `fs`, center frequency `fc`, and order of
the gammatone filter `gamma_order`. The filter bandwidth will be 1 ERB.
Filter coefficients are computed according to Eq. 13 and 14 from Hohmann (2002).

`hohmann2002_filter(fs, fc, gamma_order, bandwidth_factor)` uses filter
bandwidth of `bandwidth_factor` ERB (instead of 1 ERB).

`hohmann2002_filter(fs, fc, bw, attenuation_db, gamma_order)` designs
the filter such that for the bandwidth `bw`, the attenuation `attenuation_db`
at the corner frequencies of the filter is reached. Filter coefficient
are computed as in Eq. 11 and 12 from Hohmann (2002)

V. Hohmann.
Frequency analysis and synthesis using a gammatone filterbank.
*Acta Acustica united with Acoustica*, 88(3):433-442, 2002.