76 lines
2.8 KiB
Matlab
76 lines
2.8 KiB
Matlab
function [d, nt, nt_use, nt_skip] = find_test_signal(x, 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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%% Find start marker
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fprintf('Finding test start marker...\n');
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s = sync_chirp(test.fs, 'up');
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nx = length(x);
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n_half = round(nx/2);
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n = min(round(test.fs*test.sm), n_half);
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y = x(1:n);
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[r, lags] = xcorr(y, s);
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[r_max, idx] = max(r);
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d_start = lags(idx);
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%% Find end marker
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fprintf('Finding test end marker...\n');
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s = sync_chirp(test.fs, 'down');
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n = min(round(test.fs*test.em),n_half);
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y = x(end-n+1:end);
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[r, lags] = xcorr(y, s);
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[r_max, idx] = max(r);
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d_end = nx-n+lags(idx);
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%% Check correct length of signal
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len = d_end-d_start;
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len_s = len/test.fs;
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ref_s = test.mark_t+test.nf*test.na*test.tl;
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if abs(len_s-ref_s) > test.mt
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len_s
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ref_s
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error('Start and end markers were not found. Test play or capture quality may be poor');
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end
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%% Delay to first tone, length of tone in samples
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d = d_start + round(test.mark_t*test.fs);
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if (d < 0)
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error('Invalid negative delay seen. Test play or capture quality may be poor');
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end
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nt = round(test.tl*test.fs);
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nt_use = nt -round(test.is*test.fs) -round(test.ie*test.fs);
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if nt_use < 0
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error('Test signal length parameters must be wrong!');
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end
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nt_skip = round(test.is*test.fs);
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end
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