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95 lines
4.8 KiB
95 lines
4.8 KiB
/*********************************************************************** |
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Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
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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 |
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are met: |
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- Redistributions of source code must retain the above copyright notice, |
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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 Internet Society, IETF or IETF Trust, nor the |
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names of specific contributors, may be used to endorse or promote |
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products derived from this software without specific prior written |
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permission. |
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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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#ifdef HAVE_CONFIG_H |
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#include "config.h" |
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#endif |
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/********************************************************************** |
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* Correlation matrix computations for LS estimate. |
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**********************************************************************/ |
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#include "main_FLP.h" |
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/* Calculates correlation vector X'*t */ |
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void silk_corrVector_FLP( |
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const silk_float *x, /* I x vector [L+order-1] used to create X */ |
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const silk_float *t, /* I Target vector [L] */ |
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const opus_int L, /* I Length of vecors */ |
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const opus_int Order, /* I Max lag for correlation */ |
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silk_float *Xt, /* O X'*t correlation vector [order] */ |
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int arch |
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) |
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{ |
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opus_int lag; |
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const silk_float *ptr1; |
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ptr1 = &x[ Order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */ |
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for( lag = 0; lag < Order; lag++ ) { |
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/* Calculate X[:,lag]'*t */ |
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Xt[ lag ] = (silk_float)silk_inner_product_FLP( ptr1, t, L, arch ); |
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ptr1--; /* Next column of X */ |
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} |
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} |
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/* Calculates correlation matrix X'*X */ |
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void silk_corrMatrix_FLP( |
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const silk_float *x, /* I x vector [ L+order-1 ] used to create X */ |
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const opus_int L, /* I Length of vectors */ |
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const opus_int Order, /* I Max lag for correlation */ |
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silk_float *XX, /* O X'*X correlation matrix [order x order] */ |
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int arch |
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) |
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{ |
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opus_int j, lag; |
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double energy; |
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const silk_float *ptr1, *ptr2; |
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ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */ |
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energy = silk_energy_FLP( ptr1, L ); /* X[:,0]'*X[:,0] */ |
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matrix_ptr( XX, 0, 0, Order ) = ( silk_float )energy; |
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for( j = 1; j < Order; j++ ) { |
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/* Calculate X[:,j]'*X[:,j] */ |
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energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ]; |
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matrix_ptr( XX, j, j, Order ) = ( silk_float )energy; |
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} |
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ptr2 = &x[ Order - 2 ]; /* First sample of column 1 of X */ |
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for( lag = 1; lag < Order; lag++ ) { |
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/* Calculate X[:,0]'*X[:,lag] */ |
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energy = silk_inner_product_FLP( ptr1, ptr2, L, arch ); |
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matrix_ptr( XX, lag, 0, Order ) = ( silk_float )energy; |
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matrix_ptr( XX, 0, lag, Order ) = ( silk_float )energy; |
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/* Calculate X[:,j]'*X[:,j + lag] */ |
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for( j = 1; j < ( Order - lag ); j++ ) { |
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energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ]; |
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matrix_ptr( XX, lag + j, j, Order ) = ( silk_float )energy; |
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matrix_ptr( XX, j, lag + j, Order ) = ( silk_float )energy; |
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} |
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ptr2--; /* Next column of X */ |
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} |
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}
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