83 lines
3.1 KiB
Matlab
83 lines
3.1 KiB
Matlab
function test = mix_chirp(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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%% Adjust tone length to integer number of samples
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test.nt = round(test.cl*test.fs); % Make number of samples per tone
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test.tl = test.nt/test.fs; % an integer by adjusting tl.
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%% Test start and end marker tones
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[h1, mark_start] = sync_chirp(test.fs, 'up');
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[h2, mark_end] = sync_chirp(test.fs, 'down');
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test.mark_t = mark_start.t;
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test.mark_a = mark_start.a;
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test.mark_a_db = mark_start.a_db;
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test.ts = mark_start.t;
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%% Idle time to start and end
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test.idle_t = 0.5;
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n_idle = round(test.fs*test.idle_t);
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t_idle = n_idle/test.fs;
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x = zeros(test.nt + mark_start.n + mark_end.n +2*n_idle, test.nch, 'int32');
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%% Add markers
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idx1 = n_idle+1;
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idx2 = length(x)-n_idle-mark_end.n;
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for ch=test.ch
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x(idx1:idx1+mark_start.n-1, ch) = dither_and_quantize(h1, test.bits_in);
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x(idx2:idx2+mark_end.n-1, ch) = dither_and_quantize(h2, test.bits_in);
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end
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%% Dither also idle parts
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x(1:n_idle) = dither_and_quantize(zeros(n_idle,1), test.bits_in);
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x(end-n_idle+1:end) = dither_and_quantize(zeros(n_idle,1), test.bits_in);
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%% Add Chirp
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i1 = n_idle+mark_start.n+1;
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i2 = i1+test.nt-1;
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fprintf('Mixing %.1f dBFS chirp ...\n', test.a_db);
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tc = ((1:round(test.cl*test.fs))-1)/test.fs;
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s = test.a * chirp(tc, test.f_min, test.tl, test.f_max, 'linear', 90);
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sign = 1;
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for ch=test.ch
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x(i1:i2, ch) = dither_and_quantize(sign * s, test.bits_in);
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sign = -sign;
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end
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test.signal = x;
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%% Output
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fprintf('Writing output data file %s...\n', test.fn_in);
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write_test_data(x, test.fn_in, test.bits_in, test.fmt);
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fprintf('Done.\n')
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end
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