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function [y,n] = audspacebw(fmin,fmax,varargin)
%-*- texinfo -*-
%@deftypefn {Function} audspacebw
%@verbatim
%AUDSPACEBW Auditory scale points specified by bandwidth
% Usage: y=audspacebw(fmin,fmax,bw,hitme);
% y=audspacebw(fmin,fmax,bw);
% y=audspacebw(fmin,fmax);
% [y,n]=audspacebw(...);
%
% AUDSPACEBW(fmin,fmax,bw,scale) computes a vector containing values
% equistantly scaled between frequencies fmin and fmax on the
% selected auditory scale. All frequencies are specified in Hz.The
% distance between two consecutive values is bw on the selected scale,
% and the points will be centered on the scale between fmin and fmax.
%
% See the help on FREQTOAUD to get a list of the supported values of the
% scale parameter.
%
% AUDSPACEBW(fmin,fmax,bw,hitme,scale) will do as above, but one of
% the points is quaranteed to be the frequency hitme.
%
% [y,n]=AUDSPACEBW(...) additionally returns the number of points n in
% the output vector y.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/auditory/audspacebw.html}
%@seealso{freqtoaud, audspace, audfiltbw}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
% AUTHOR : Peter L. Soendergaard
% ------ Checking of input parameters ---------
if nargin<2
error('%s: Too few input parameters.',upper(mfilename));
end;
if ~isnumeric(fmin) || ~isscalar(fmin) || fmin<0
error('%s: fmin must be a non-negative scalar.',upper(mfilename));
end;
if ~isnumeric(fmax) || ~isscalar(fmax) || fmax<0
error('%s: fmax must be a non-negative scalar.',upper(mfilename));
end;
if fmin>fmax
error('%s: fmin must be less than or equal to fmax.',upper(mfilename));
end;
definput.import={'freqtoaud'};
definput.keyvals.hitme=[];
definput.keyvals.bw=1;
[flags,kv,bw]=ltfatarghelper({'bw','hitme'},definput,varargin);
if ~isnumeric(bw) || ~isscalar(bw) || bw<=0
error('%s: bw must be a positive scalar.',upper(mfilename));
end;
%% ------ Computation --------------------------
if isempty(kv.hitme)
% Convert the frequency limits to auds.
audlimits = freqtoaud([fmin,fmax],flags.audscale);
audrange = audlimits(2)-audlimits(1);
% Calculate number of points, excluding final point
n = floor(audrange/bw);
% The remainder is calculated in order to center the points
% correctly between fmin and fmax.
remainder = audrange-n*bw;
audpoints = audlimits(1)+(0:n)*bw+remainder/2;
% Add the final point
n=n+1;
else
% Convert the frequency limits to auds.
audlimits = freqtoaud([fmin,fmax,kv.hitme],flags.audscale);
audrangelow = audlimits(3)-audlimits(1);
audrangehigh = audlimits(2)-audlimits(3);
% Calculate number of points, exluding final point.
nlow = floor(audrangelow/bw);
nhigh = floor(audrangehigh/bw);
audpoints=(-nlow:nhigh)*bw+audlimits(3);
n=nlow+nhigh+1;
end;
y = audtofreq(audpoints,flags.audscale);
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