Complex Conjugate

Functions
void	csky_dsp_lib_vec_cx_conj_q15 (q15_t *A, uint32_t N, q15_t *C)
	Q15 complex vector conjugate. More...
void	csky_dsp_lib_vec_cx_conj_q31 (q31_t *A, uint32_t N, q31_t *C)
	Q31 complex vector conjugate. More...

Description

Conjugate the elements of a complex data vector, the source data is from A, and the data in A is stored in an interleaved fashion(real, imag, real, imag, ...), so, the length of A is 2*N(including N complex data), finally the results are stored in C. The computaional process is:

for(i=0; i < N; i++)
{
    *(C+2*i + 0) = *(C+2*i + 0);
    *(C+2*i + 1) = -*(C+2*i + 1);
}

support for q15 and q31 format.

Function Documentation

void csky_dsp_lib_vec_cx_conj_q15	(	q15_t *	A,
		uint32_t	N,
		q15_t *	C
	)

Parameters

[in]	*A	points to the input buffer
[in]	N	number of samples in each vector
[out]	*C	points to the output buffer

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.

void csky_dsp_lib_vec_cx_conj_q31	(	q31_t *	A,
		uint32_t	N,
		q31_t *	C
	)

Parameters

[in]	*A	points to the input buffer
[in]	N	number of samples in each vector
[out]	*C	points to the output buffer

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.