85 lines
3.1 KiB
Matlab
85 lines
3.1 KiB
Matlab
function test = aip_test_measure(test)
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%%
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% Copyright (c) 2017, 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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%% Reference: AES17 6.6.7 Attenuation of image products
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% http://www.aes.org/publications/standards/
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%% Load output file
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[x, nx] = load_test_output(test);
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if nx == 0
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test.g_db = NaN;
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test.fail = 1;
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return
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end
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%% Find sync
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[d, nt, nt_use, nt_skip] = find_test_signal(x, test);
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%% Measure all test frequencies
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t_skip = 1.0;
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ml = zeros(test.nf,1);
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mn = zeros(test.nf,1);
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b_lpf = stdlpf_get(test.fu, test.fs); % Get LPF coef
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b_hpf = stdhpf_get(test.fu, test.fs); % Get HPF coef
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for n=1:test.nf
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fprintf('Measuring %.0f Hz ...\n', test.f(n));
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% Get notch coef for this frequency
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[b_notch, a_notch] = stdnotch_get(test.f(n), test.fs);
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i1 = d+(n-1)*nt+nt_skip;
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i2 = i1+nt_use-1;
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x_lpf = filter(b_lpf, 1, x(i1:i2)); % Standard LPF, need for 997 Hz only
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x_notch = filter(b_notch, a_notch, x(i1:i2)); % Standard notch
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x_hpf = filter(b_hpf, 1, x_notch); % Standard HPF
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ml(n) = level_dbfs(x_lpf(round(t_skip*test.fs):end));
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mn(n) = level_dbfs(x_hpf(round(t_skip*test.fs):end));
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end
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%% Calculate levels relative to first 997 Hz frequency,
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% remove it from result, sort to ascinding order for plot
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test.f = test.f(2:end);
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test.m = mn(2:end)-ml(1);
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test.aip = max(test.m); % Worst-case
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if test.aip > test.aip_max
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test.fail = 1;
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else
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test.fail = 0;
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end
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test.fh = figure('visible', test.visible);
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semilogx(test.f, test.m);
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grid on;
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xlabel('Frequency (Hz)');
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ylabel('Relative level (dB)');
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grid on;
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end
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