function ERB = f2erb(CF_Hz, ERB_break_freq, ERB_Q)
%F2ERB calculates the widt of 1 Cam in Hz at frequency f in Hz
%
%   When used with only the frequency as input, F2ERB calculates ERB [Hz]
%   according to moore2016
%   when used with all three input parameters, it calculates ERB [Hz]
%   as used in lyon2011
%
%   Auditory filter nominal Equivalent Rectangular Bandwidth
%   Ref: Glasberg and Moore: Hearing Research, 47 (1990), 103-138
%   
%       ERB = 24.7 * (1 + 4.37 * CF_Hz / 1000);
%
%   See also: moore2016 lyon2011_design
%
%   Url: http://amtoolbox.org/amt-1.5.0/doc/common/f2erb.php


%   #Author: The AMT Team (2021)

% This file is licensed unter the GNU General Public License (GPL) either 
% version 3 of the license, or any later version as published by the Free Software 
% Foundation. Details of the GPLv3 can be found in the AMT directory "licences" and 
% at <https://www.gnu.org/licenses/gpl-3.0.html>. 
% You can redistribute this file and/or modify it under the terms of the GPLv3. 
% This file is distributed without any warranty; without even the implied warranty 
% of merchantability or fitness for a particular purpose. 


if nargin < 3
    ERB_Q = 1000/(24.7*4.37);  % 9.2645
        if nargin < 2
            ERB_break_freq = 1000/4.37;  % 228.833
        end
end

if nargin == 1
    ERB = 24.673*(0.004368*CF_Hz + 1); %as originally given in moore2016
else
    ERB = (ERB_break_freq + CF_Hz) / ERB_Q;
end