Project Ne10
An Open Optimized Software Library Project for the ARM Architecture
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NE10_iir_init.c
1/*
2 * Copyright 2012-15 ARM Limited and Contributors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of ARM Limited nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY ARM LIMITED AND CONTRIBUTORS "AS IS" AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL ARM LIMITED AND CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28/*
29 * NE10 Library : dsp/NE10_iir_init.c
30 */
31#include "NE10_types.h"
32
33
46 ne10_uint16_t numStages,
47 ne10_float32_t * pkCoeffs,
48 ne10_float32_t * pvCoeffs,
49 ne10_float32_t * pState,
50 ne10_uint32_t blockSize)
51{
52 /* Assign filter taps */
53 S->numStages = numStages;
54
55 /* Assign reflection coefficient pointer */
56 S->pkCoeffs = pkCoeffs;
57
58 /* Assign ladder coefficient pointer */
59 S->pvCoeffs = pvCoeffs;
60
61 /* Clear state buffer and size is always blockSize + numStages */
62 memset (pState, 0, (numStages + blockSize) * sizeof (ne10_float32_t));
63
64 /* Assign state pointer */
65 S->pState = pState;
66
67 return NE10_OK;
68}
69
ne10_result_t ne10_iir_lattice_init_float(ne10_iir_lattice_instance_f32_t *S, ne10_uint16_t numStages, ne10_float32_t *pkCoeffs, ne10_float32_t *pvCoeffs, ne10_float32_t *pState, ne10_uint32_t blockSize)
Initialization function for the floating-point IIR lattice filter.
Instance structure for the floating point IIR Lattice filter.
Definition NE10_types.h:420
ne10_float32_t * pState
Points to the state variable array.
Definition NE10_types.h:422
ne10_float32_t * pkCoeffs
Points to the reflection coefficient array.
Definition NE10_types.h:423
ne10_uint16_t numStages
numStages of the of lattice filter.
Definition NE10_types.h:421
ne10_float32_t * pvCoeffs
Points to the ladder coefficient array.
Definition NE10_types.h:424