Mean

void riscv_mean_f32(const float32_t *pSrc, uint32_t blockSize, float32_t *pResult)
void riscv_mean_q15(const q15_t *pSrc, uint32_t blockSize, q15_t *pResult)
void riscv_mean_q31(const q31_t *pSrc, uint32_t blockSize, q31_t *pResult)
void riscv_mean_q7(const q7_t *pSrc, uint32_t blockSize, q7_t *pResult)
group mean

Calculates the mean of the input vector. Mean is defined as the average of the elements in the vector. The underlying algorithm is used:

There are separate functions for floating-point, Q31, Q15, and Q7 data types.

Functions

void riscv_mean_f32(const float32_t *pSrc, uint32_t blockSize, float32_t *pResult)

Mean value of a floating-point vector.

Return

none

Parameters
  • [in] pSrc: points to the input vector.

  • [in] blockSize: number of samples in input vector.

  • [out] pResult: mean value returned here.

void riscv_mean_q15(const q15_t *pSrc, uint32_t blockSize, q15_t *pResult)

Mean value of a Q15 vector.

Return

none

Scaling and Overflow Behavior

The function is implemented using a 32-bit internal accumulator. The input is represented in 1.15 format and is accumulated in a 32-bit accumulator in 17.15 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.15 format.

Parameters
  • [in] pSrc: points to the input vector

  • [in] blockSize: number of samples in input vector

  • [out] pResult: mean value returned here

void riscv_mean_q31(const q31_t *pSrc, uint32_t blockSize, q31_t *pResult)

Mean value of a Q31 vector.

Return

none

Scaling and Overflow Behavior

The function is implemented using a 64-bit internal accumulator. The input is represented in 1.31 format and is accumulated in a 64-bit accumulator in 33.31 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.31 format.

Parameters
  • [in] pSrc: points to the input vector

  • [in] blockSize: number of samples in input vector

  • [out] pResult: mean value returned here

void riscv_mean_q7(const q7_t *pSrc, uint32_t blockSize, q7_t *pResult)

Mean value of a Q7 vector.

Return

none

Scaling and Overflow Behavior

The function is implemented using a 32-bit internal accumulator. The input is represented in 1.7 format and is accumulated in a 32-bit accumulator in 25.7 format. There is no risk of internal overflow with this approach, and the full precision of intermediate result is preserved. Finally, the accumulator is truncated to yield a result of 1.7 format.

Parameters
  • [in] pSrc: points to the input vector

  • [in] blockSize: number of samples in input vector

  • [out] pResult: mean value returned here