diff options
Diffstat (limited to 'libs/qm-dsp/maths/Correlation.cpp')
-rw-r--r-- | libs/qm-dsp/maths/Correlation.cpp | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/libs/qm-dsp/maths/Correlation.cpp b/libs/qm-dsp/maths/Correlation.cpp new file mode 100644 index 0000000000..17ee28f749 --- /dev/null +++ b/libs/qm-dsp/maths/Correlation.cpp @@ -0,0 +1,56 @@ +/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ + +/* + QM DSP Library + + Centre for Digital Music, Queen Mary, University of London. + This file 2005-2006 Christian Landone. + + This program 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 2 of the + License, or (at your option) any later version. See the file + COPYING included with this distribution for more information. +*/ + +#include "Correlation.h" + +////////////////////////////////////////////////////////////////////// +// Construction/Destruction +////////////////////////////////////////////////////////////////////// + +Correlation::Correlation() +{ + +} + +Correlation::~Correlation() +{ + +} + +void Correlation::doAutoUnBiased(double *src, double *dst, unsigned int length) +{ + double tmp = 0.0; + double outVal = 0.0; + + unsigned int i,j; + + for( i = 0; i < length; i++) + { + for( j = i; j < length; j++) + { + tmp += src[ j-i ] * src[ j ]; + } + + + outVal = tmp / ( length - i ); + + if( outVal <= 0 ) + dst[ i ] = EPS; + else + dst[ i ] = outVal; + + tmp = 0.0; + } +} |