94 lines
4.7 KiB
C
94 lines
4.7 KiB
C
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/***********************************************************************
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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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)
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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 );
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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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)
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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 );
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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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