Functions |
void | arm_cmplx_mult_cmplx_f32 (float32_t *pSrcA, float32_t *pSrcB, float32_t *pDst, uint32_t numSamples) |
| Floating-point complex-by-complex multiplication.
|
void | arm_cmplx_mult_cmplx_q15 (q15_t *pSrcA, q15_t *pSrcB, q15_t *pDst, uint32_t numSamples) |
| Q15 complex-by-complex multiplication.
|
void | arm_cmplx_mult_cmplx_q31 (q31_t *pSrcA, q31_t *pSrcB, q31_t *pDst, uint32_t numSamples) |
| Q31 complex-by-complex multiplication.
|
Description
Multiplies a complex vector by another complex vector and generates a complex result. The data in the complex arrays is stored in an interleaved fashion (real, imag, real, imag, ...). The parameter numSamples
represents the number of complex samples processed. The complex arrays have a total of 2*numSamples
real values.
The underlying algorithm is used:
for(n=0; n<numSamples; n++) {
pDst[(2*n)+0] = pSrcA[(2*n)+0] * pSrcB[(2*n)+0] - pSrcA[(2*n)+1] * pSrcB[(2*n)+1];
pDst[(2*n)+1] = pSrcA[(2*n)+0] * pSrcB[(2*n)+1] + pSrcA[(2*n)+1] * pSrcB[(2*n)+0];
}
There are separate functions for floating-point, Q15, and Q31 data types.
Function Documentation
void arm_cmplx_mult_cmplx_f32 |
( |
float32_t * |
pSrcA, |
|
|
float32_t * |
pSrcB, |
|
|
float32_t * |
pDst, |
|
|
uint32_t |
numSamples |
|
) |
| |
- Parameters:
-
[in] | *pSrcA | points to the first input vector |
[in] | *pSrcB | points to the second input vector |
[out] | *pDst | points to the output vector |
[in] | numSamples | number of complex samples in each vector |
- Returns:
- none.
- Examples:
- arm_convolution_example_f32.c.
void arm_cmplx_mult_cmplx_q15 |
( |
q15_t * |
pSrcA, |
|
|
q15_t * |
pSrcB, |
|
|
q15_t * |
pDst, |
|
|
uint32_t |
numSamples |
|
) |
| |
- Parameters:
-
[in] | *pSrcA | points to the first input vector |
[in] | *pSrcB | points to the second input vector |
[out] | *pDst | points to the output vector |
[in] | numSamples | number of complex samples in each vector |
- Returns:
- none.
Scaling and Overflow Behavior:
- The function implements 1.15 by 1.15 multiplications and finally output is converted into 3.13 format.
void arm_cmplx_mult_cmplx_q31 |
( |
q31_t * |
pSrcA, |
|
|
q31_t * |
pSrcB, |
|
|
q31_t * |
pDst, |
|
|
uint32_t |
numSamples |
|
) |
| |
- Parameters:
-
[in] | *pSrcA | points to the first input vector |
[in] | *pSrcB | points to the second input vector |
[out] | *pDst | points to the output vector |
[in] | numSamples | number of complex samples in each vector |
- Returns:
- none.
Scaling and Overflow Behavior:
- The function implements 1.31 by 1.31 multiplications and finally output is converted into 3.29 format. Input down scaling is not required.