1 /* ----------------------------------------------------------------------
2 * Project: CMSIS DSP Library
3 * Title: arm_cmplx_mult_cmplx_f64.c
4 * Description: Floating-point complex-by-complex multiplication
5 *
6 * $Date: 13 September 2021
7 * $Revision: V1.10.0
8 *
9 * Target Processor: Cortex-M and Cortex-A cores
10 * -------------------------------------------------------------------- */
11 /*
12 * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13 *
14 * SPDX-License-Identifier: Apache-2.0
15 *
16 * Licensed under the Apache License, Version 2.0 (the License); you may
17 * not use this file except in compliance with the License.
18 * You may obtain a copy of the License at
19 *
20 * www.apache.org/licenses/LICENSE-2.0
21 *
22 * Unless required by applicable law or agreed to in writing, software
23 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25 * See the License for the specific language governing permissions and
26 * limitations under the License.
27 */
28
29 #include "dsp/complex_math_functions.h"
30
31 /**
32 @ingroup groupCmplxMath
33 */
34
35 /**
36 @addtogroup CmplxByCmplxMult
37 @{
38 */
39
40 /**
41 @brief Floating-point complex-by-complex multiplication.
42 @param[in] pSrcA points to first input vector
43 @param[in] pSrcB points to second input vector
44 @param[out] pDst points to output vector
45 @param[in] numSamples number of samples in each vector
46 @return none
47 */
48
arm_cmplx_mult_cmplx_f64(const float64_t * pSrcA,const float64_t * pSrcB,float64_t * pDst,uint32_t numSamples)49 void arm_cmplx_mult_cmplx_f64(
50 const float64_t * pSrcA,
51 const float64_t * pSrcB,
52 float64_t * pDst,
53 uint32_t numSamples)
54 {
55 uint32_t blkCnt; /* Loop counter */
56 float64_t a, b, c, d; /* Temporary variables to store real and imaginary values */
57
58 /* Initialize blkCnt with number of samples */
59 blkCnt = numSamples;
60
61 while (blkCnt > 0U)
62 {
63 /* C[2 * i ] = A[2 * i] * B[2 * i ] - A[2 * i + 1] * B[2 * i + 1]. */
64 /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i ]. */
65
66 a = *pSrcA++;
67 b = *pSrcA++;
68 c = *pSrcB++;
69 d = *pSrcB++;
70
71 /* store result in destination buffer. */
72 *pDst++ = (a * c) - (b * d);
73 *pDst++ = (a * d) + (b * c);
74
75 /* Decrement loop counter */
76 blkCnt--;
77 }
78
79 }
80
81 /**
82 @} end of CmplxByCmplxMult group
83 */
84