1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_fir_sparse_init_f32.c
* Description: Floating-point sparse FIR filter initialization function
*
* $Date: 27. January 2017
* $Revision: V.1.5.1
*
* Target Processor: Cortex-M cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "arm_math.h"
/**
* @ingroup groupFilters
*/
/**
* @addtogroup FIR_Sparse
* @{
*/
/**
* @brief Initialization function for the floating-point sparse FIR filter.
* @param[in,out] *S points to an instance of the floating-point sparse FIR structure.
* @param[in] numTaps number of nonzero coefficients in the filter.
* @param[in] *pCoeffs points to the array of filter coefficients.
* @param[in] *pState points to the state buffer.
* @param[in] *pTapDelay points to the array of offset times.
* @param[in] maxDelay maximum offset time supported.
* @param[in] blockSize number of samples that will be processed per block.
* @return none
*
* <b>Description:</b>
* \par
* <code>pCoeffs</code> holds the filter coefficients and has length <code>numTaps</code>.
* <code>pState</code> holds the filter's state variables and must be of length
* <code>maxDelay + blockSize</code>, where <code>maxDelay</code>
* is the maximum number of delay line values.
* <code>blockSize</code> is the
* number of samples processed by the <code>arm_fir_sparse_f32()</code> function.
*/
void arm_fir_sparse_init_f32(
arm_fir_sparse_instance_f32 * S,
uint16_t numTaps,
float32_t * pCoeffs,
float32_t * pState,
int32_t * pTapDelay,
uint16_t maxDelay,
uint32_t blockSize)
{
/* Assign filter taps */
S->numTaps = numTaps;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Assign TapDelay pointer */
S->pTapDelay = pTapDelay;
/* Assign MaxDelay */
S->maxDelay = maxDelay;
/* reset the stateIndex to 0 */
S->stateIndex = 0U;
/* Clear state buffer and size is always maxDelay + blockSize */
memset(pState, 0, (maxDelay + blockSize) * sizeof(float32_t));
/* Assign state pointer */
S->pState = pState;
}
/**
* @} end of FIR_Sparse group
*/
|
