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CMSIS-DSP
Version 1.5.2
CMSIS DSP Software Library
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Functions | |
| void | arm_cmplx_dot_prod_f32 (float32_t *pSrcA, float32_t *pSrcB, uint32_t numSamples, float32_t *realResult, float32_t *imagResult) |
| Floating-point complex dot product. More... | |
| void | arm_cmplx_dot_prod_q15 (q15_t *pSrcA, q15_t *pSrcB, uint32_t numSamples, q31_t *realResult, q31_t *imagResult) |
| Q15 complex dot product. More... | |
| void | arm_cmplx_dot_prod_q31 (q31_t *pSrcA, q31_t *pSrcB, uint32_t numSamples, q63_t *realResult, q63_t *imagResult) |
| Q31 complex dot product. More... | |
Computes the dot product of two complex vectors. The vectors are multiplied element-by-element and then summed.
The pSrcA points to the first complex input vector and pSrcB points to the second complex input vector. 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:
realResult=0;
imagResult=0;
for(n=0; n<numSamples; n++) {
realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1];
imagResult += 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.
| void arm_cmplx_dot_prod_f32 | ( | float32_t * | pSrcA, |
| float32_t * | pSrcB, | ||
| uint32_t | numSamples, | ||
| float32_t * | realResult, | ||
| float32_t * | imagResult | ||
| ) |
| *pSrcA | points to the first input vector |
| *pSrcB | points to the second input vector |
| numSamples | number of complex samples in each vector |
| *realResult | real part of the result returned here |
| *imagResult | imaginary part of the result returned here |
| void arm_cmplx_dot_prod_q15 | ( | q15_t * | pSrcA, |
| q15_t * | pSrcB, | ||
| uint32_t | numSamples, | ||
| q31_t * | realResult, | ||
| q31_t * | imagResult | ||
| ) |
| *pSrcA | points to the first input vector |
| *pSrcB | points to the second input vector |
| numSamples | number of complex samples in each vector |
| *realResult | real part of the result returned here |
| *imagResult | imaginary part of the result returned here |
Scaling and Overflow Behavior:
realResult and imagResult are in 8.24 format. | void arm_cmplx_dot_prod_q31 | ( | q31_t * | pSrcA, |
| q31_t * | pSrcB, | ||
| uint32_t | numSamples, | ||
| q63_t * | realResult, | ||
| q63_t * | imagResult | ||
| ) |
| *pSrcA | points to the first input vector |
| *pSrcB | points to the second input vector |
| numSamples | number of complex samples in each vector |
| *realResult | real part of the result returned here |
| *imagResult | imaginary part of the result returned here |
Scaling and Overflow Behavior:
numSamples is less than 32768. The return results realResult and imagResult are in 16.48 format. Input down scaling is not required.