CMSIS-DSP: arm_rfft_q31.c File Reference

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arm_rfft_q31.c File Reference

## Functions

void | arm_radix4_butterfly_inverse_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pCoef, uint32_t twidCoefModifier)
| Core function for the Q31 CIFFT butterfly process. More...
void | arm_radix4_butterfly_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pCoef, uint32_t twidCoefModifier)
| Core function for the Q31 CFFT butterfly process. More...
void | arm_bitreversal_q31 (q31_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, uint16_t *pBitRevTab)
void | arm_split_rfft_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pATable, q31_t *pBTable, q31_t *pDst, uint32_t modifier)
| Core Real FFT process. More...
void | arm_split_rifft_q31 (q31_t *pSrc, uint32_t fftLen, q31_t *pATable, q31_t *pBTable, q31_t *pDst, uint32_t modifier)
| Core Real IFFT process. More...
void | arm_rfft_q31 (const arm_rfft_instance_q31 *S, q31_t *pSrc, q31_t *pDst)
| Processing function for the Q31 RFFT/RIFFT. More...

## Function Documentation

void arm_bitreversal_q31 | ( | q31_t * | pSrc,
|  | uint32_t | fftLen,
|  | uint16_t | bitRevFactor,
|  | uint16_t * | pBitRevTab
| ) |  |

Referenced by arm_cfft_radix2_q31(), arm_cfft_radix4_q31(), and arm_rfft_q31().

void arm_radix4_butterfly_inverse_q31 | ( | q31_t * | pSrc,
|  | uint32_t | fftLen,
|  | q31_t * | pCoef,
|  | uint32_t | twidCoefModifier
| ) |  |

Parameters

  [in,out] | *pSrc | points to the in-place buffer of Q31 data type.
  [in] | fftLen | length of the FFT.
  [in] | *pCoef | points to twiddle coefficient buffer.
  [in] | twidCoefModifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

References __SIMD64.

Referenced by arm_cfft_radix4_q31(), and arm_rfft_q31().

void arm_radix4_butterfly_q31 | ( | q31_t * | pSrc,
|  | uint32_t | fftLen,
|  | q31_t * | pCoef,
|  | uint32_t | twidCoefModifier
| ) |  |

end of ComplexFFT group

Parameters

  [in,out] | *pSrc | points to the in-place buffer of Q31 data type.
  [in] | fftLen | length of the FFT.
  [in] | *pCoef | points to twiddle coefficient buffer.
  [in] | twidCoefModifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

References __SIMD64.

Referenced by arm_cfft_radix4_q31(), and arm_rfft_q31().

void arm_split_rfft_q31 | ( | q31_t * | pSrc,
|  | uint32_t | fftLen,
|  | q31_t * | pATable,
|  | q31_t * | pBTable,
|  | q31_t * | pDst,
|  | uint32_t | modifier
| ) |  |

end of RealFFT group

Parameters

  [in] | *pSrc | points to the input buffer.
  [in] | fftLen | length of FFT.
  [in] | *pATable | points to the twiddle Coef A buffer.
  [in] | *pBTable | points to the twiddle Coef B buffer.
  [out] | *pDst | points to the output buffer.
  [in] | modifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

Referenced by arm_rfft_q31().

void arm_split_rifft_q31 | ( | q31_t * | pSrc,
|  | uint32_t | fftLen,
|  | q31_t * | pATable,
|  | q31_t * | pBTable,
|  | q31_t * | pDst,
|  | uint32_t | modifier
| ) |  |

Parameters

  [in] | *pSrc | points to the input buffer.
  [in] | fftLen | length of FFT.
  [in] | *pATable | points to the twiddle Coef A buffer.
  [in] | *pBTable | points to the twiddle Coef B buffer.
  [out] | *pDst | points to the output buffer.
  [in] | modifier | twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Returns
  none.

Referenced by arm_rfft_q31().