arm_lms_init_f32.c
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CLexer
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r16 | /*----------------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 29. November 2010 | ||||
* $Revision: V1.0.3 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_lms_init_f32.c | ||||
* | ||||
* Description: Floating-point LMS 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" | ||||
/** | ||||
* @addtogroup LMS | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Initialization function for floating-point 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 the 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: | ||||
* <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 an array of length <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_lms_f32()</code>. | ||||
*/ | ||||
void arm_lms_init_f32( | ||||
arm_lms_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 */ | ||||
memset(pState, 0, (numTaps + (blockSize - 1)) * sizeof(float32_t)); | ||||
/* Assign state pointer */ | ||||
S->pState = pState; | ||||
/* Assign Step size value */ | ||||
S->mu = mu; | ||||
} | ||||
/** | ||||
* @} end of LMS group | ||||
*/ | ||||