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Diffstat (limited to 'power_sequencer/operators/audiosync/cross_correlation.py')
| -rw-r--r-- | power_sequencer/operators/audiosync/cross_correlation.py | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/power_sequencer/operators/audiosync/cross_correlation.py b/power_sequencer/operators/audiosync/cross_correlation.py new file mode 100644 index 00000000..b18ab35e --- /dev/null +++ b/power_sequencer/operators/audiosync/cross_correlation.py @@ -0,0 +1,33 @@ +# +# Copyright (C) 2016-2019 by Nathan Lovato, Daniel Oakey, Razvan Radulescu, and contributors +# +# This file is part of Power Sequencer. +# +# Power Sequencer 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. +# +# Power Sequencer 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 Power Sequencer. If +# not, see <https://www.gnu.org/licenses/>. +# +import numpy as np + + +def cross_correlation(mfcc1, mfcc2, nframes): + n1, mdim1 = mfcc1.shape + # n2, mdim2 = mfcc2.shape + + n = n1 - nframes + 1 + + if n < 0: + return None + + c = np.zeros(n) + for k in range(n): + cc = np.sum(np.multiply(mfcc1[k : k + nframes], mfcc2[:nframes]), axis=0) + c[k] = np.linalg.norm(cc) + return c |