| /* ---------------------------------------------------------------------- | |
| * Project: CMSIS DSP Library | |
| * Title: arm_cmplx_mult_cmplx_f64.c | |
| * Description: Floating-point complex-by-complex multiplication | |
| * | |
| * $Date: 13 September 2021 | |
| * $Revision: V1.10.0 | |
| * | |
| * Target Processor: Cortex-M and Cortex-A cores | |
| * -------------------------------------------------------------------- */ | |
| /* | |
| * Copyright (C) 2010-2021 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. | |
| */ | |
| /** | |
| @ingroup groupCmplxMath | |
| */ | |
| /** | |
| @addtogroup CmplxByCmplxMult | |
| @{ | |
| */ | |
| /** | |
| @brief Floating-point complex-by-complex multiplication. | |
| @param[in] pSrcA points to first input vector | |
| @param[in] pSrcB points to second input vector | |
| @param[out] pDst points to output vector | |
| @param[in] numSamples number of samples in each vector | |
| @return none | |
| */ | |
| void arm_cmplx_mult_cmplx_f64( | |
| const float64_t * pSrcA, | |
| const float64_t * pSrcB, | |
| float64_t * pDst, | |
| uint32_t numSamples) | |
| { | |
| uint32_t blkCnt; /* Loop counter */ | |
| float64_t a, b, c, d; /* Temporary variables to store real and imaginary values */ | |
| /* Initialize blkCnt with number of samples */ | |
| blkCnt = numSamples; | |
| while (blkCnt > 0U) | |
| { | |
| /* C[2 * i ] = A[2 * i] * B[2 * i ] - A[2 * i + 1] * B[2 * i + 1]. */ | |
| /* C[2 * i + 1] = A[2 * i] * B[2 * i + 1] + A[2 * i + 1] * B[2 * i ]. */ | |
| a = *pSrcA++; | |
| b = *pSrcA++; | |
| c = *pSrcB++; | |
| d = *pSrcB++; | |
| /* store result in destination buffer. */ | |
| *pDst++ = (a * c) - (b * d); | |
| *pDst++ = (a * d) + (b * c); | |
| /* Decrement loop counter */ | |
| blkCnt--; | |
| } | |
| } | |
| /** | |
| @} end of CmplxByCmplxMult group | |
| */ | |