Joep D / CMSIS_DSP_5

The CMSIS DSP 5 library

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functions/FilteringFunctions/arm_lms_init_f32.c@3:4098b9d3d571, 2018-06-21 (annotated)

Committer:
xorjoep
Date:
Thu Jun 21 11:56:27 2018 +0000
Revision:
3:4098b9d3d571
Parent:
1:24714b45cd1b 
headers is a folder not a library

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xorjoep 1:24714b45cd1b 1 /* ----------------------------------------------------------------------
xorjoep 1:24714b45cd1b 2 * Project: CMSIS DSP Library
xorjoep 1:24714b45cd1b 3 * Title: arm_lms_init_f32.c
xorjoep 1:24714b45cd1b 4 * Description: Floating-point LMS filter initialization function
xorjoep 1:24714b45cd1b 5 *
xorjoep 1:24714b45cd1b 6 * $Date: 27. January 2017
xorjoep 1:24714b45cd1b 7 * $Revision: V.1.5.1
xorjoep 1:24714b45cd1b 8 *
xorjoep 1:24714b45cd1b 9 * Target Processor: Cortex-M cores
xorjoep 1:24714b45cd1b 10 * -------------------------------------------------------------------- */
xorjoep 1:24714b45cd1b 11 /*
xorjoep 1:24714b45cd1b 12 * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
xorjoep 1:24714b45cd1b 13 *
xorjoep 1:24714b45cd1b 14 * SPDX-License-Identifier: Apache-2.0
xorjoep 1:24714b45cd1b 15 *
xorjoep 1:24714b45cd1b 16 * Licensed under the Apache License, Version 2.0 (the License); you may
xorjoep 1:24714b45cd1b 17 * not use this file except in compliance with the License.
xorjoep 1:24714b45cd1b 18 * You may obtain a copy of the License at
xorjoep 1:24714b45cd1b 19 *
xorjoep 1:24714b45cd1b 20 * www.apache.org/licenses/LICENSE-2.0
xorjoep 1:24714b45cd1b 21 *
xorjoep 1:24714b45cd1b 22 * Unless required by applicable law or agreed to in writing, software
xorjoep 1:24714b45cd1b 23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
xorjoep 1:24714b45cd1b 24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
xorjoep 1:24714b45cd1b 25 * See the License for the specific language governing permissions and
xorjoep 1:24714b45cd1b 26 * limitations under the License.
xorjoep 1:24714b45cd1b 27 */
xorjoep 1:24714b45cd1b 28
xorjoep 1:24714b45cd1b 29 #include "arm_math.h"
xorjoep 1:24714b45cd1b 30
xorjoep 1:24714b45cd1b 31 /**
xorjoep 1:24714b45cd1b 32 * @addtogroup LMS
xorjoep 1:24714b45cd1b 33 * @{
xorjoep 1:24714b45cd1b 34 */
xorjoep 1:24714b45cd1b 35
xorjoep 1:24714b45cd1b 36 /**
xorjoep 1:24714b45cd1b 37 * @brief Initialization function for floating-point LMS filter.
xorjoep 1:24714b45cd1b 38 * @param[in] *S points to an instance of the floating-point LMS filter structure.
xorjoep 1:24714b45cd1b 39 * @param[in] numTaps number of filter coefficients.
xorjoep 1:24714b45cd1b 40 * @param[in] *pCoeffs points to the coefficient buffer.
xorjoep 1:24714b45cd1b 41 * @param[in] *pState points to state buffer.
xorjoep 1:24714b45cd1b 42 * @param[in] mu step size that controls filter coefficient updates.
xorjoep 1:24714b45cd1b 43 * @param[in] blockSize number of samples to process.
xorjoep 1:24714b45cd1b 44 * @return none.
xorjoep 1:24714b45cd1b 45 */
xorjoep 1:24714b45cd1b 46
xorjoep 1:24714b45cd1b 47 /**
xorjoep 1:24714b45cd1b 48 * \par Description:
xorjoep 1:24714b45cd1b 49 * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order:
xorjoep 1:24714b45cd1b 50 * <pre>
xorjoep 1:24714b45cd1b 51 * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]}
xorjoep 1:24714b45cd1b 52 * </pre>
xorjoep 1:24714b45cd1b 53 * The initial filter coefficients serve as a starting point for the adaptive filter.
xorjoep 1:24714b45cd1b 54 * <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>.
xorjoep 1:24714b45cd1b 55 */
xorjoep 1:24714b45cd1b 56
xorjoep 1:24714b45cd1b 57 void arm_lms_init_f32(
xorjoep 1:24714b45cd1b 58 arm_lms_instance_f32 * S,
xorjoep 1:24714b45cd1b 59 uint16_t numTaps,
xorjoep 1:24714b45cd1b 60 float32_t * pCoeffs,
xorjoep 1:24714b45cd1b 61 float32_t * pState,
xorjoep 1:24714b45cd1b 62 float32_t mu,
xorjoep 1:24714b45cd1b 63 uint32_t blockSize)
xorjoep 1:24714b45cd1b 64 {
xorjoep 1:24714b45cd1b 65 /* Assign filter taps */
xorjoep 1:24714b45cd1b 66 S->numTaps = numTaps;
xorjoep 1:24714b45cd1b 67
xorjoep 1:24714b45cd1b 68 /* Assign coefficient pointer */
xorjoep 1:24714b45cd1b 69 S->pCoeffs = pCoeffs;
xorjoep 1:24714b45cd1b 70
xorjoep 1:24714b45cd1b 71 /* Clear state buffer and size is always blockSize + numTaps */
xorjoep 1:24714b45cd1b 72 memset(pState, 0, (numTaps + (blockSize - 1)) * sizeof(float32_t));
xorjoep 1:24714b45cd1b 73
xorjoep 1:24714b45cd1b 74 /* Assign state pointer */
xorjoep 1:24714b45cd1b 75 S->pState = pState;
xorjoep 1:24714b45cd1b 76
xorjoep 1:24714b45cd1b 77 /* Assign Step size value */
xorjoep 1:24714b45cd1b 78 S->mu = mu;
xorjoep 1:24714b45cd1b 79 }
xorjoep 1:24714b45cd1b 80
xorjoep 1:24714b45cd1b 81 /**
xorjoep 1:24714b45cd1b 82 * @} end of LMS group
xorjoep 1:24714b45cd1b 83 */