/*-----------------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date: 29. November 2010
* $Revision: V1.0.3
*
* Project: CMSIS DSP Library
* Title: arm_lms_norm_init_f32.c
*
* Description: Floating-point NLMS filter initialization function.
*
* Target Processor: Cortex-M4/Cortex-M3
*
* Version 1.0.3 2010/11/29
* Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
* Documentation updated.
*
* Version 1.0.1 2010/10/05
* Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
* Production release and review comments incorporated
*
* Version 0.0.7 2010/06/10
* Misra-C changes done
* ---------------------------------------------------------------------------*/
#include "arm_math.h"
/**
* @ingroup groupFilters
*/
/**
* @addtogroup LMS_NORM
* @{
*/
/**
* @brief Initialization function for floating-point normalized LMS filter.
* @param[in] *S points to an instance of the floating-point LMS filter structure.
* @param[in] numTaps number of filter coefficients.
* @param[in] *pCoeffs points to coefficient buffer.
* @param[in] *pState points to state buffer.
* @param[in] mu step size that controls filter coefficient updates.
* @param[in] blockSize number of samples to process.
* @return none.
*
* \par Description:
* pCoeffs
points to the array of filter coefficients stored in time reversed order:
*
* {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]} ** The initial filter coefficients serve as a starting point for the adaptive filter. *
pState
points to an array of length numTaps+blockSize-1
samples,
* where blockSize
is the number of input samples processed by each call to arm_lms_norm_f32()
.
*/
void arm_lms_norm_init_f32(
arm_lms_norm_instance_f32 * S,
uint16_t numTaps,
float32_t * pCoeffs,
float32_t * pState,
float32_t mu,
uint32_t blockSize)
{
/* Assign filter taps */
S->numTaps = numTaps;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Clear state buffer and size is always blockSize + numTaps - 1 */
memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(float32_t));
/* Assign state pointer */
S->pState = pState;
/* Assign Step size value */
S->mu = mu;
/* Initialise Energy to zero */
S->energy = 0.0f;
/* Initialise x0 to zero */
S->x0 = 0.0f;
}
/**
* @} end of LMS_NORM group
*/