mirror of https://github.com/thesofproject/sof.git
73 lines
2.8 KiB
Matlab
73 lines
2.8 KiB
Matlab
function [m, ph, gd] = eq_compute_response(z, p, k, f, fs)
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%%
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% Copyright (c) 2016, Intel Corporation
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions are met:
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% * Redistributions of source code must retain the above copyright
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% notice, this list of conditions and the following disclaimer.
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% * Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in the
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% documentation and/or other materials provided with the distribution.
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% * Neither the name of the Intel Corporation nor the
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% names of its contributors may be used to endorse or promote products
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% derived from this software without specific prior written permission.
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%
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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% POSSIBILITY OF SUCH DAMAGE.
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%
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% Author: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
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%
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switch nargin
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case 3
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b = z; % 1st arg
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f = p; % 2nd arg
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fs = k; % 3rd arg
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h = freqz(b, 1, f, fs);
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m = 20*log10(abs(h));
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ph = 180/pi*angle(h);
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if length(b) == 1
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gd = zeros(1, length(f));
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else
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if exist('OCTAVE_VERSION', 'builtin')
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% grpdelay() has some issue so better to not show a plot
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gd = NaN * zeros(1, length(f));
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else
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gd = 1/fs*grpdelay(b, 1, f, fs);
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end
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end
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case 5
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[b, a] = zp2tf(z, p, k);
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h = freqz(b, a, f, fs);
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m = 20*log10(abs(h));
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ph = 180/pi*angle(h);
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if length(z) == 0 && length(p) == 0
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gd = zeros(1, length(f));
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else
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if exist('OCTAVE_VERSION', 'builtin')
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% grpdelay() has some issue so better to not show a plot
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gd = NaN * zeros(1, length(f));
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else
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gd = 1/fs*grpdelay(b, a, f, fs);
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end
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end
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otherwise
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error('Incorrect input parameters');
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end
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end
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