|
|
/* ----------------------------------------------------------------------
|
|
|
* Copyright (C) 2010 ARM Limited. All rights reserved.
|
|
|
*
|
|
|
* $Date: 29. November 2010
|
|
|
* $Revision: V1.0.3
|
|
|
*
|
|
|
* Project: CMSIS DSP Library
|
|
|
* Title: arm_cmplx_conj_f32.c
|
|
|
*
|
|
|
* Description: Floating-point complex conjugate.
|
|
|
*
|
|
|
* Target Processor: Cortex-M4/Cortex-M3
|
|
|
*
|
|
|
* Version 1.0.3 2010/11/29
|
|
|
* Re-organized the CMSIS folders and updated documentation.
|
|
|
*
|
|
|
* Version 1.0.2 2010/11/11
|
|
|
* Documentation updated.
|
|
|
*
|
|
|
* Version 1.0.1 2010/10/05
|
|
|
* Production release and review comments incorporated.
|
|
|
*
|
|
|
* Version 1.0.0 2010/09/20
|
|
|
* Production release and review comments incorporated.
|
|
|
* ---------------------------------------------------------------------------- */
|
|
|
|
|
|
#include "arm_math.h"
|
|
|
|
|
|
/**
|
|
|
* @ingroup groupCmplxMath
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @defgroup cmplx_conj Complex Conjugate
|
|
|
*
|
|
|
* Conjugates the elements of a complex data vector.
|
|
|
*
|
|
|
* The <code>pSrc</code> points to the source data and
|
|
|
* <code>pDst</code> points to the where the result should be written.
|
|
|
* <code>numSamples</code> specifies the number of complex samples
|
|
|
* and the data in each array is stored in an interleaved fashion
|
|
|
* (real, imag, real, imag, ...).
|
|
|
* Each array has a total of <code>2*numSamples</code> values.
|
|
|
* The underlying algorithm is used:
|
|
|
*
|
|
|
* <pre>
|
|
|
* for(n=0; n<numSamples; n++) {
|
|
|
* pDst[(2*n)+0)] = pSrc[(2*n)+0]; // real part
|
|
|
* pDst[(2*n)+1)] = -pSrc[(2*n)+1]; // imag part
|
|
|
* }
|
|
|
* </pre>
|
|
|
*
|
|
|
* There are separate functions for floating-point, Q15, and Q31 data types.
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @addtogroup cmplx_conj
|
|
|
* @{
|
|
|
*/
|
|
|
|
|
|
/**
|
|
|
* @brief Floating-point complex conjugate.
|
|
|
* @param *pSrc points to the input vector
|
|
|
* @param *pDst points to the output vector
|
|
|
* @param numSamples number of complex samples in each vector
|
|
|
* @return none.
|
|
|
*/
|
|
|
|
|
|
void arm_cmplx_conj_f32(
|
|
|
float32_t * pSrc,
|
|
|
float32_t * pDst,
|
|
|
uint32_t numSamples)
|
|
|
{
|
|
|
uint32_t blkCnt; /* loop counter */
|
|
|
|
|
|
/*loop Unrolling */
|
|
|
blkCnt = numSamples >> 2u;
|
|
|
|
|
|
/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
|
|
|
** a second loop below computes the remaining 1 to 3 samples. */
|
|
|
while(blkCnt > 0u)
|
|
|
{
|
|
|
/* C[0]+jC[1] = A[0]+ j (-1) A[1] */
|
|
|
/* Calculate Complex Conjugate and then store the results in the destination buffer. */
|
|
|
*pDst++ = *pSrc++;
|
|
|
*pDst++ = -*pSrc++;
|
|
|
*pDst++ = *pSrc++;
|
|
|
*pDst++ = -*pSrc++;
|
|
|
*pDst++ = *pSrc++;
|
|
|
*pDst++ = -*pSrc++;
|
|
|
*pDst++ = *pSrc++;
|
|
|
*pDst++ = -*pSrc++;
|
|
|
|
|
|
/* Decrement the loop counter */
|
|
|
blkCnt--;
|
|
|
}
|
|
|
|
|
|
/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
|
|
|
** No loop unrolling is used. */
|
|
|
blkCnt = numSamples % 0x4u;
|
|
|
|
|
|
while(blkCnt > 0u)
|
|
|
{
|
|
|
/* C[0]+jC[1] = A[0]+ j (-1) A[1] */
|
|
|
/* Calculate Complex Conjugate and then store the results in the destination buffer. */
|
|
|
*pDst++ = *pSrc++;
|
|
|
*pDst++ = -*pSrc++;
|
|
|
|
|
|
/* Decrement the loop counter */
|
|
|
blkCnt--;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @} end of cmplx_conj group
|
|
|
*/
|
|
|
|
