CMSIS DSP library
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cmsis_dsp/FilteringFunctions/arm_lms_norm_init_q15.c@2:da51fb522205, 2013-05-30 (annotated)
- Committer:
- emilmont
- Date:
- Thu May 30 17:10:11 2013 +0100
- Revision:
- 2:da51fb522205
- Parent:
- 1:fdd22bb7aa52
- Child:
- 3:7a284390b0ce
Keep "cmsis-dsp" module in synch with its source
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /*----------------------------------------------------------------------------- |
emilmont | 1:fdd22bb7aa52 | 2 | * Copyright (C) 2010 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
emilmont | 1:fdd22bb7aa52 | 4 | * $Date: 15. February 2012 |
emilmont | 2:da51fb522205 | 5 | * $Revision: V1.1.0 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 2:da51fb522205 | 7 | * Project: CMSIS DSP Library |
emilmont | 1:fdd22bb7aa52 | 8 | * Title: arm_lms_norm_init_q15.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 1:fdd22bb7aa52 | 10 | * Description: Q15 NLMS initialization function. |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emilmont | 1:fdd22bb7aa52 | 13 | * |
emilmont | 1:fdd22bb7aa52 | 14 | * Version 1.1.0 2012/02/15 |
emilmont | 1:fdd22bb7aa52 | 15 | * Updated with more optimizations, bug fixes and minor API changes. |
emilmont | 1:fdd22bb7aa52 | 16 | * |
emilmont | 1:fdd22bb7aa52 | 17 | * Version 1.0.10 2011/7/15 |
emilmont | 1:fdd22bb7aa52 | 18 | * Big Endian support added and Merged M0 and M3/M4 Source code. |
emilmont | 1:fdd22bb7aa52 | 19 | * |
emilmont | 1:fdd22bb7aa52 | 20 | * Version 1.0.3 2010/11/29 |
emilmont | 1:fdd22bb7aa52 | 21 | * Re-organized the CMSIS folders and updated documentation. |
emilmont | 1:fdd22bb7aa52 | 22 | * |
emilmont | 1:fdd22bb7aa52 | 23 | * Version 1.0.2 2010/11/11 |
emilmont | 1:fdd22bb7aa52 | 24 | * Documentation updated. |
emilmont | 1:fdd22bb7aa52 | 25 | * |
emilmont | 1:fdd22bb7aa52 | 26 | * Version 1.0.1 2010/10/05 |
emilmont | 1:fdd22bb7aa52 | 27 | * Production release and review comments incorporated. |
emilmont | 1:fdd22bb7aa52 | 28 | * |
emilmont | 1:fdd22bb7aa52 | 29 | * Version 1.0.0 2010/09/20 |
emilmont | 1:fdd22bb7aa52 | 30 | * Production release and review comments incorporated |
emilmont | 1:fdd22bb7aa52 | 31 | * |
emilmont | 1:fdd22bb7aa52 | 32 | * Version 0.0.7 2010/06/10 |
emilmont | 1:fdd22bb7aa52 | 33 | * Misra-C changes done |
emilmont | 1:fdd22bb7aa52 | 34 | * ---------------------------------------------------------------------------*/ |
emilmont | 1:fdd22bb7aa52 | 35 | |
emilmont | 1:fdd22bb7aa52 | 36 | #include "arm_math.h" |
emilmont | 1:fdd22bb7aa52 | 37 | #include "arm_common_tables.h" |
emilmont | 1:fdd22bb7aa52 | 38 | |
emilmont | 1:fdd22bb7aa52 | 39 | /** |
emilmont | 1:fdd22bb7aa52 | 40 | * @addtogroup LMS_NORM |
emilmont | 1:fdd22bb7aa52 | 41 | * @{ |
emilmont | 1:fdd22bb7aa52 | 42 | */ |
emilmont | 1:fdd22bb7aa52 | 43 | |
emilmont | 1:fdd22bb7aa52 | 44 | /** |
emilmont | 1:fdd22bb7aa52 | 45 | * @brief Initialization function for Q15 normalized LMS filter. |
emilmont | 1:fdd22bb7aa52 | 46 | * @param[in] *S points to an instance of the Q15 normalized LMS filter structure. |
emilmont | 1:fdd22bb7aa52 | 47 | * @param[in] numTaps number of filter coefficients. |
emilmont | 1:fdd22bb7aa52 | 48 | * @param[in] *pCoeffs points to coefficient buffer. |
emilmont | 1:fdd22bb7aa52 | 49 | * @param[in] *pState points to state buffer. |
emilmont | 1:fdd22bb7aa52 | 50 | * @param[in] mu step size that controls filter coefficient updates. |
emilmont | 1:fdd22bb7aa52 | 51 | * @param[in] blockSize number of samples to process. |
emilmont | 1:fdd22bb7aa52 | 52 | * @param[in] postShift bit shift applied to coefficients. |
emilmont | 1:fdd22bb7aa52 | 53 | * @return none. |
emilmont | 1:fdd22bb7aa52 | 54 | * |
emilmont | 1:fdd22bb7aa52 | 55 | * <b>Description:</b> |
emilmont | 1:fdd22bb7aa52 | 56 | * \par |
emilmont | 1:fdd22bb7aa52 | 57 | * <code>pCoeffs</code> points to the array of filter coefficients stored in time reversed order: |
emilmont | 1:fdd22bb7aa52 | 58 | * <pre> |
emilmont | 1:fdd22bb7aa52 | 59 | * {b[numTaps-1], b[numTaps-2], b[N-2], ..., b[1], b[0]} |
emilmont | 1:fdd22bb7aa52 | 60 | * </pre> |
emilmont | 1:fdd22bb7aa52 | 61 | * The initial filter coefficients serve as a starting point for the adaptive filter. |
emilmont | 1:fdd22bb7aa52 | 62 | * <code>pState</code> points to the array of state variables and size of array is |
emilmont | 1:fdd22bb7aa52 | 63 | * <code>numTaps+blockSize-1</code> samples, where <code>blockSize</code> is the number of input samples processed |
emilmont | 1:fdd22bb7aa52 | 64 | * by each call to <code>arm_lms_norm_q15()</code>. |
emilmont | 1:fdd22bb7aa52 | 65 | */ |
emilmont | 1:fdd22bb7aa52 | 66 | |
emilmont | 1:fdd22bb7aa52 | 67 | void arm_lms_norm_init_q15( |
emilmont | 1:fdd22bb7aa52 | 68 | arm_lms_norm_instance_q15 * S, |
emilmont | 1:fdd22bb7aa52 | 69 | uint16_t numTaps, |
emilmont | 1:fdd22bb7aa52 | 70 | q15_t * pCoeffs, |
emilmont | 1:fdd22bb7aa52 | 71 | q15_t * pState, |
emilmont | 1:fdd22bb7aa52 | 72 | q15_t mu, |
emilmont | 1:fdd22bb7aa52 | 73 | uint32_t blockSize, |
emilmont | 1:fdd22bb7aa52 | 74 | uint8_t postShift) |
emilmont | 1:fdd22bb7aa52 | 75 | { |
emilmont | 1:fdd22bb7aa52 | 76 | /* Assign filter taps */ |
emilmont | 1:fdd22bb7aa52 | 77 | S->numTaps = numTaps; |
emilmont | 1:fdd22bb7aa52 | 78 | |
emilmont | 1:fdd22bb7aa52 | 79 | /* Assign coefficient pointer */ |
emilmont | 1:fdd22bb7aa52 | 80 | S->pCoeffs = pCoeffs; |
emilmont | 1:fdd22bb7aa52 | 81 | |
emilmont | 1:fdd22bb7aa52 | 82 | /* Clear state buffer and size is always blockSize + numTaps - 1 */ |
emilmont | 1:fdd22bb7aa52 | 83 | memset(pState, 0, (numTaps + (blockSize - 1u)) * sizeof(q15_t)); |
emilmont | 1:fdd22bb7aa52 | 84 | |
emilmont | 1:fdd22bb7aa52 | 85 | /* Assign post Shift value applied to coefficients */ |
emilmont | 1:fdd22bb7aa52 | 86 | S->postShift = postShift; |
emilmont | 1:fdd22bb7aa52 | 87 | |
emilmont | 1:fdd22bb7aa52 | 88 | /* Assign state pointer */ |
emilmont | 1:fdd22bb7aa52 | 89 | S->pState = pState; |
emilmont | 1:fdd22bb7aa52 | 90 | |
emilmont | 1:fdd22bb7aa52 | 91 | /* Assign Step size value */ |
emilmont | 1:fdd22bb7aa52 | 92 | S->mu = mu; |
emilmont | 1:fdd22bb7aa52 | 93 | |
emilmont | 1:fdd22bb7aa52 | 94 | /* Initialize reciprocal pointer table */ |
emilmont | 1:fdd22bb7aa52 | 95 | S->recipTable = (q15_t *) armRecipTableQ15; |
emilmont | 1:fdd22bb7aa52 | 96 | |
emilmont | 1:fdd22bb7aa52 | 97 | /* Initialise Energy to zero */ |
emilmont | 1:fdd22bb7aa52 | 98 | S->energy = 0; |
emilmont | 1:fdd22bb7aa52 | 99 | |
emilmont | 1:fdd22bb7aa52 | 100 | /* Initialise x0 to zero */ |
emilmont | 1:fdd22bb7aa52 | 101 | S->x0 = 0; |
emilmont | 1:fdd22bb7aa52 | 102 | |
emilmont | 1:fdd22bb7aa52 | 103 | } |
emilmont | 1:fdd22bb7aa52 | 104 | |
emilmont | 1:fdd22bb7aa52 | 105 | /** |
emilmont | 1:fdd22bb7aa52 | 106 | * @} end of LMS_NORM group |
emilmont | 1:fdd22bb7aa52 | 107 | */ |