diff options
Diffstat (limited to 'silk/float/SKP_Silk_corrMatrix_FLP.c')
| -rw-r--r-- | silk/float/SKP_Silk_corrMatrix_FLP.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/silk/float/SKP_Silk_corrMatrix_FLP.c b/silk/float/SKP_Silk_corrMatrix_FLP.c new file mode 100644 index 00000000..0fdaabd0 --- /dev/null +++ b/silk/float/SKP_Silk_corrMatrix_FLP.c @@ -0,0 +1,89 @@ +/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, (subject to the limitations in the disclaimer below)
+are permitted provided that the following conditions are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Skype Limited, nor the names of specific
+contributors, may be used to endorse or promote products derived from
+this software without specific prior written permission.
+NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
+BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+/**********************************************************************
+ * Correlation matrix computations for LS estimate.
+ **********************************************************************/
+
+#include "SKP_Silk_main_FLP.h"
+
+/* Calculates correlation vector X'*t */
+void SKP_Silk_corrVector_FLP(
+ const SKP_float *x, /* I x vector [L+order-1] used to create X */
+ const SKP_float *t, /* I Target vector [L] */
+ const SKP_int L, /* I Length of vecors */
+ const SKP_int Order, /* I Max lag for correlation */
+ SKP_float *Xt /* O X'*t correlation vector [order] */
+)
+{
+ SKP_int lag;
+ const SKP_float *ptr1;
+
+ ptr1 = &x[ Order - 1 ]; /* Points to first sample of column 0 of X: X[:,0] */
+ for( lag = 0; lag < Order; lag++ ) {
+ /* Calculate X[:,lag]'*t */
+ Xt[ lag ] = (SKP_float)SKP_Silk_inner_product_FLP( ptr1, t, L );
+ ptr1--; /* Next column of X */
+ }
+}
+
+/* Calculates correlation matrix X'*X */
+void SKP_Silk_corrMatrix_FLP(
+ const SKP_float *x, /* I x vector [ L+order-1 ] used to create X */
+ const SKP_int L, /* I Length of vectors */
+ const SKP_int Order, /* I Max lag for correlation */
+ SKP_float *XX /* O X'*X correlation matrix [order x order] */
+)
+{
+ SKP_int j, lag;
+ double energy;
+ const SKP_float *ptr1, *ptr2;
+
+ ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */
+ energy = SKP_Silk_energy_FLP( ptr1, L ); /* X[:,0]'*X[:,0] */
+ matrix_ptr( XX, 0, 0, Order ) = ( SKP_float )energy;
+ for( j = 1; j < Order; j++ ) {
+ /* Calculate X[:,j]'*X[:,j] */
+ energy += ptr1[ -j ] * ptr1[ -j ] - ptr1[ L - j ] * ptr1[ L - j ];
+ matrix_ptr( XX, j, j, Order ) = ( SKP_float )energy;
+ }
+
+ ptr2 = &x[ Order - 2 ]; /* First sample of column 1 of X */
+ for( lag = 1; lag < Order; lag++ ) {
+ /* Calculate X[:,0]'*X[:,lag] */
+ energy = SKP_Silk_inner_product_FLP( ptr1, ptr2, L );
+ matrix_ptr( XX, lag, 0, Order ) = ( SKP_float )energy;
+ matrix_ptr( XX, 0, lag, Order ) = ( SKP_float )energy;
+ /* Calculate X[:,j]'*X[:,j + lag] */
+ for( j = 1; j < ( Order - lag ); j++ ) {
+ energy += ptr1[ -j ] * ptr2[ -j ] - ptr1[ L - j ] * ptr2[ L - j ];
+ matrix_ptr( XX, lag + j, j, Order ) = ( SKP_float )energy;
+ matrix_ptr( XX, j, lag + j, Order ) = ( SKP_float )energy;
+ }
+ ptr2--; /* Next column of X */
+ }
+}
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