|
|
/*-----------------------------------------------------------------------------
|
|
|
* Copyright (C) 2010 ARM Limited. All rights reserved.
|
|
|
*
|
|
|
* $Date: 15. July 2011
|
|
|
* $Revision: V1.0.10
|
|
|
*
|
|
|
* Project: CMSIS DSP Library
|
|
|
* Title: arm_lms_norm_init_q15.c
|
|
|
*
|
|
|
* Description: Q15 NLMS initialization function.
|
|
|
*
|
|
|
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
|
|
|
*
|
|
|
* Version 1.0.10 2011/7/15
|
|
|
* Big Endian support added and Merged M0 and M3/M4 Source code.
|
|
|
*
|
|
|
* 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"
|
|
|
#include "arm_common_tables.h"
|
|
|
|
|
|
/**
|
|
|
* @addtogroup LMS_NORM
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Initialization function for Q15 normalized LMS filter.
|
|
|
* @param[in] *S points to an instance of the Q15 normalized 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.
|
|
|
* @param[in] postShift bit shift applied to coefficients.
|
|
|
* @return none.
|
|
|
*
|
|
|
* <b>Description:</b>
|
|
|
* \par
|
|
|
* <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
|
|
|
* <pre>
|
|
|
* {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
|
|
|
* </pre>
|
|
|
* The initial filter coefficients serve as a starting point for the adaptive filter.
|
|
|
* <code>pState</code> points to the array of state variables and size of array is
|
|
|
* <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed
|
|
|
* by each call to <code>arm_lms_norm_q15()</code>.
|
|
|
*/
|
|
|
|
|
|
void arm_lms_norm_init_q15(
|
|
|
arm_lms_norm_instance_q15 * S,
|
|
|
uint16_t numTaps,
|
|
|
q15_t * pCoeffs,
|
|
|
q15_t * pState,
|
|
|
q15_t mu,
|
|
|
uint32_t blockSize,
|
|
|
uint8_t postShift)
|
|
|
{
|
|
|
/* 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(q15_t));
|
|
|
|
|
|
/* Assign post Shift value applied to coefficients */
|
|
|
S->postShift = postShift;
|
|
|
|
|
|
/* Assign state pointer */
|
|
|
S->pState = pState;
|
|
|
|
|
|
/* Assign Step size value */
|
|
|
S->mu = mu;
|
|
|
|
|
|
/* Initialize reciprocal pointer table */
|
|
|
S->recipTable = armRecipTableQ15;
|
|
|
|
|
|
/* Initialise Energy to zero */
|
|
|
S->energy = 0;
|
|
|
|
|
|
/* Initialise x0 to zero */
|
|
|
S->x0 = 0;
|
|
|
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @} end of LMS_NORM group
|
|
|
*/
|
|
|
|
