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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 
)
void arm_radix4_butterfly_inverse_q31 ( q31_t pSrc,
uint32_t  fftLen,
q31_t pCoef,
uint32_t  twidCoefModifier 
)
Parameters
[in,out]*pSrcpoints to the in-place buffer of Q31 data type.
[in]fftLenlength of the FFT.
[in]*pCoefpoints to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle 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]*pSrcpoints to the in-place buffer of Q31 data type.
[in]fftLenlength of the FFT.
[in]*pCoefpoints to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle 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]*pSrcpoints to the input buffer.
[in]fftLenlength of FFT.
[in]*pATablepoints to the twiddle Coef A buffer.
[in]*pBTablepoints to the twiddle Coef B buffer.
[out]*pDstpoints to the output buffer.
[in]modifiertwiddle 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]*pSrcpoints to the input buffer.
[in]fftLenlength of FFT.
[in]*pATablepoints to the twiddle Coef A buffer.
[in]*pBTablepoints to the twiddle Coef B buffer.
[out]*pDstpoints to the output buffer.
[in]modifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none.

Referenced by arm_rfft_q31().