NMSIS-DSP  Version 1.2.0
NMSIS DSP Software Library
Complex Conjugate

Conjugates the elements of a complex data vector. More...

Functions

void riscv_cmplx_conj_f16 (const float16_t *pSrc, float16_t *pDst, uint32_t numSamples)
 Floating-point complex conjugate. More...
 
void riscv_cmplx_conj_f32 (const float32_t *pSrc, float32_t *pDst, uint32_t numSamples)
 Floating-point complex conjugate. More...
 
void riscv_cmplx_conj_q15 (const q15_t *pSrc, q15_t *pDst, uint32_t numSamples)
 Q15 complex conjugate. More...
 
void riscv_cmplx_conj_q31 (const q31_t *pSrc, q31_t *pDst, uint32_t numSamples)
 Q31 complex conjugate. More...
 

Detailed Description

Conjugates the elements of a complex data vector.

The pSrc points to the source data and pDst points to the destination data where the result should be written. numSamples 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 2*numSamples values.

The underlying algorithm is used:

for (n = 0; n < numSamples; n++) {
    pDst[(2*n)  ] =  pSrc[(2*n)  ];    // real part
    pDst[(2*n)+1] = -pSrc[(2*n)+1];    // imag part
}

There are separate functions for floating-point, Q15, and Q31 data types.

Function Documentation

◆ riscv_cmplx_conj_f16()

void riscv_cmplx_conj_f16 ( const float16_t *  pSrc,
float16_t *  pDst,
uint32_t  numSamples 
)

Floating-point complex conjugate.

Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]numSamplesnumber of samples in each vector
Returns
none

◆ riscv_cmplx_conj_f32()

void riscv_cmplx_conj_f32 ( const float32_t *  pSrc,
float32_t *  pDst,
uint32_t  numSamples 
)

Floating-point complex conjugate.

Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]numSamplesnumber of samples in each vector
Returns
none

◆ riscv_cmplx_conj_q15()

void riscv_cmplx_conj_q15 ( const q15_t *  pSrc,
q15_t *  pDst,
uint32_t  numSamples 
)

Q15 complex conjugate.

Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]numSamplesnumber of samples in each vector
Returns
none
Scaling and Overflow Behavior
The function uses saturating arithmetic. The Q15 value -1 (0x8000) is saturated to the maximum allowable positive value 0x7FFF.

◆ riscv_cmplx_conj_q31()

void riscv_cmplx_conj_q31 ( const q31_t *  pSrc,
q31_t *  pDst,
uint32_t  numSamples 
)

Q31 complex conjugate.

Parameters
[in]pSrcpoints to the input vector
[out]pDstpoints to the output vector
[in]numSamplesnumber of samples in each vector
Returns
none
Scaling and Overflow Behavior
The function uses saturating arithmetic. The Q31 value -1 (0x80000000) is saturated to the maximum allowable positive value 0x7FFFFFFF.