# Complex ConjugateComplex Math Functions

## Functions

void arm_cmplx_conj_f32 (float32_t *pSrc, float32_t *pDst, uint32_t numSamples)
Floating-point complex conjugate.

void arm_cmplx_conj_q15 (q15_t *pSrc, q15_t *pDst, uint32_t numSamples)
Q15 complex conjugate.

void arm_cmplx_conj_q31 (q31_t *pSrc, q31_t *pDst, uint32_t numSamples)
Q31 complex conjugate.

## Description

Conjugates the elements of a complex data vector.

The `pSrc` points to the source data and `pDst` points to the 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)+0)] = pSrc[(2*n)+0];     // 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

 void arm_cmplx_conj_f32 ( float32_t * `pSrc, ` float32_t * `pDst, ` uint32_t `numSamples ` )
Parameters
 `*pSrc` points to the input vector `*pDst` points to the output vector `numSamples` number of complex samples in each vector
Returns
none.
 void arm_cmplx_conj_q15 ( q15_t * `pSrc, ` q15_t * `pDst, ` uint32_t `numSamples ` )
Parameters
 `*pSrc` points to the input vector `*pDst` points to the output vector `numSamples` number of complex samples in each vector
Returns
none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.

References __QASX(), __QSAX(), and __SIMD32.

 void arm_cmplx_conj_q31 ( q31_t * `pSrc, ` q31_t * `pDst, ` uint32_t `numSamples ` )
Parameters
 `*pSrc` points to the input vector `*pDst` points to the output vector `numSamples` number of complex samples in each vector
Returns
none.

Scaling and Overflow Behavior:

The function uses saturating arithmetic. The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.

References __QSUB().