CMSIS DSP library
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arm_lms_norm_init_f32.c
00001 /*----------------------------------------------------------------------------- 00002 * Copyright (C) 2010-2013 ARM Limited. All rights reserved. 00003 * 00004 * $Date: 17. January 2013 00005 * $Revision: V1.4.1 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_lms_norm_init_f32.c 00009 * 00010 * Description: Floating-point NLMS filter initialization function. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 00013 * 00014 * Redistribution and use in source and binary forms, with or without 00015 * modification, are permitted provided that the following conditions 00016 * are met: 00017 * - Redistributions of source code must retain the above copyright 00018 * notice, this list of conditions and the following disclaimer. 00019 * - Redistributions in binary form must reproduce the above copyright 00020 * notice, this list of conditions and the following disclaimer in 00021 * the documentation and/or other materials provided with the 00022 * distribution. 00023 * - Neither the name of ARM LIMITED nor the names of its contributors 00024 * may be used to endorse or promote products derived from this 00025 * software without specific prior written permission. 00026 * 00027 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00028 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00029 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 00030 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 00031 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 00032 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 00033 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00034 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00035 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00036 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 00037 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00038 * POSSIBILITY OF SUCH DAMAGE. 00039 * ---------------------------------------------------------------------------*/ 00040 00041 #include "arm_math.h" 00042 00043 /** 00044 * @ingroup groupFilters 00045 */ 00046 00047 /** 00048 * @addtogroup LMS_NORM 00049 * @{ 00050 */ 00051 00052 /** 00053 * @brief Initialization function for floating-point normalized LMS filter. 00054 * @param[in] *S points to an instance of the floating-point LMS filter structure. 00055 * @param[in] numTaps number of filter coefficients. 00056 * @param[in] *pCoeffs points to coefficient buffer. 00057 * @param[in] *pState points to state buffer. 00058 * @param[in] mu step size that controls filter coefficient updates. 00059 * @param[in] blockSize number of samples to process. 00060 * @return none. 00061 * 00062 * \par Description: 00063 * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order: 00064 * <pre> 00065 * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]} 00066 * </pre> 00067 * The initial filter coefficients serve as a starting point for the adaptive filter. 00068 * <code>pState</code> points to an array of length <code>numTaps+blockSize-1</code> samples, 00069 * where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_lms_norm_f32()</code>. 00070 */ 00071 00072 void arm_lms_norm_init_f32( 00073 arm_lms_norm_instance_f32 * S, 00074 uint16_t numTaps, 00075 float32_t * pCoeffs, 00076 float32_t * pState, 00077 float32_t mu, 00078 uint32_t blockSize) 00079 { 00080 /* Assign filter taps */ 00081 S->numTaps = numTaps; 00082 00083 /* Assign coefficient pointer */ 00084 S->pCoeffs = pCoeffs; 00085 00086 /* Clear state buffer and size is always blockSize + numTaps - 1 */ 00087 memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(float32_t)); 00088 00089 /* Assign state pointer */ 00090 S->pState = pState; 00091 00092 /* Assign Step size value */ 00093 S->mu = mu; 00094 00095 /* Initialise Energy to zero */ 00096 S->energy = 0.0f; 00097 00098 /* Initialise x0 to zero */ 00099 S->x0 = 0.0f; 00100 00101 } 00102 00103 /** 00104 * @} end of LMS_NORM group 00105 */
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