Complex-by-Real Multiplication

void riscv_cmplx_mult_real_f16(const float16_t *pSrcCmplx, const float16_t *pSrcReal, float16_t *pCmplxDst, uint32_t numSamples)
void riscv_cmplx_mult_real_f32(const float32_t *pSrcCmplx, const float32_t *pSrcReal, float32_t *pCmplxDst, uint32_t numSamples)
void riscv_cmplx_mult_real_q15(const q15_t *pSrcCmplx, const q15_t *pSrcReal, q15_t *pCmplxDst, uint32_t numSamples)
void riscv_cmplx_mult_real_q31(const q31_t *pSrcCmplx, const q31_t *pSrcReal, q31_t *pCmplxDst, uint32_t numSamples)
group CmplxByRealMult

Multiplies a complex vector by a real 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 while the real array has a total of numSamples real values.

The underlying algorithm is used:

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

Functions

void riscv_cmplx_mult_real_f16(const float16_t *pSrcCmplx, const float16_t *pSrcReal, float16_t *pCmplxDst, uint32_t numSamples)

Floating-point complex-by-real multiplication.

Parameters

  • pSrcCmplx – [in] points to complex input vector

  • pSrcReal – [in] points to real input vector

  • pCmplxDst – [out] points to complex output vector

  • numSamples – [in] number of samples in each vector

Returns

none

void riscv_cmplx_mult_real_f32(const float32_t *pSrcCmplx, const float32_t *pSrcReal, float32_t *pCmplxDst, uint32_t numSamples)

Floating-point complex-by-real multiplication.

Parameters

  • pSrcCmplx – [in] points to complex input vector

  • pSrcReal – [in] points to real input vector

  • pCmplxDst – [out] points to complex output vector

  • numSamples – [in] number of samples in each vector

Returns

none

void riscv_cmplx_mult_real_q15(const q15_t *pSrcCmplx, const q15_t *pSrcReal, q15_t *pCmplxDst, uint32_t numSamples)

Q15 complex-by-real multiplication.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.

Parameters

  • pSrcCmplx – [in] points to complex input vector

  • pSrcReal – [in] points to real input vector

  • pCmplxDst – [out] points to complex output vector

  • numSamples – [in] number of samples in each vector

Returns

none

void riscv_cmplx_mult_real_q31(const q31_t *pSrcCmplx, const q31_t *pSrcReal, q31_t *pCmplxDst, uint32_t numSamples)

Q31 complex-by-real multiplication.

Scaling and Overflow Behavior

The function uses saturating arithmetic. Results outside of the allowable Q31 range[0x80000000 0x7FFFFFFF] are saturated.

Parameters

  • pSrcCmplx – [in] points to complex input vector

  • pSrcReal – [in] points to real input vector

  • pCmplxDst – [out] points to complex output vector

  • numSamples – [in] number of samples in each vector

Returns

none