ref: 25f7f35555168f3426b9aad1efefab466f365af6
dir: /silk/float/silk_corrMatrix_FLP.c/
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/**********************************************************************
* Correlation matrix computations for LS estimate.
**********************************************************************/
#include "silk_main_FLP.h"
/* Calculates correlation vector X'*t */
void 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 opus_int L, /* I Length of vecors */
const opus_int Order, /* I Max lag for correlation */
SKP_float *Xt /* O X'*t correlation vector [order] */
)
{
opus_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)silk_inner_product_FLP( ptr1, t, L );
ptr1--; /* Next column of X */
}
}
/* Calculates correlation matrix X'*X */
void silk_corrMatrix_FLP(
const SKP_float *x, /* I x vector [ L+order-1 ] used to create X */
const opus_int L, /* I Length of vectors */
const opus_int Order, /* I Max lag for correlation */
SKP_float *XX /* O X'*X correlation matrix [order x order] */
)
{
opus_int j, lag;
double energy;
const SKP_float *ptr1, *ptr2;
ptr1 = &x[ Order - 1 ]; /* First sample of column 0 of X */
energy = 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 = 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 */
}
}