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arm_rfft_q15.c File Reference

Functions

void arm_radix4_butterfly_q15 (q15_t *pSrc16, uint32_t fftLen, q15_t *pCoef16, uint32_t twidCoefModifier)
 Core function for the Q15 CFFT butterfly process. More...
 
void arm_radix4_butterfly_inverse_q15 (q15_t *pSrc16, uint32_t fftLen, q15_t *pCoef16, uint32_t twidCoefModifier)
 Core function for the Q15 CIFFT butterfly process. More...
 
void arm_bitreversal_q15 (q15_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, uint16_t *pBitRevTab)
 
void arm_split_rfft_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pATable, q15_t *pBTable, q15_t *pDst, uint32_t modifier)
 Core Real FFT process. More...
 
void arm_split_rifft_q15 (q15_t *pSrc, uint32_t fftLen, q15_t *pATable, q15_t *pBTable, q15_t *pDst, uint32_t modifier)
 Core Real IFFT process. More...
 
void arm_rfft_q15 (const arm_rfft_instance_q15 *S, q15_t *pSrc, q15_t *pDst)
 Processing function for the Q15 RFFT/RIFFT. More...
 

Function Documentation

void arm_bitreversal_q15 ( q15_t pSrc,
uint32_t  fftLen,
uint16_t  bitRevFactor,
uint16_t *  pBitRevTab 
)
void arm_radix4_butterfly_inverse_q15 ( q15_t pSrc16,
uint32_t  fftLen,
q15_t pCoef16,
uint32_t  twidCoefModifier 
)
Parameters
[in,out]*pSrc16points to the in-place buffer of Q15 data type.
[in]fftLenlength of the FFT.
[in]*pCoef16points to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none.

References __SIMD32, and _SIMD32_OFFSET.

Referenced by arm_cfft_radix4_q15(), and arm_rfft_q15().

void arm_radix4_butterfly_q15 ( q15_t pSrc16,
uint32_t  fftLen,
q15_t pCoef16,
uint32_t  twidCoefModifier 
)

end of ComplexFFT group

Parameters
[in,out]*pSrc16points to the in-place buffer of Q15 data type.
[in]fftLenlength of the FFT.
[in]*pCoef16points to twiddle coefficient buffer.
[in]twidCoefModifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none.

References __SIMD32, and _SIMD32_OFFSET.

Referenced by arm_cfft_radix4_q15(), and arm_rfft_q15().

void arm_split_rfft_q15 ( q15_t pSrc,
uint32_t  fftLen,
q15_t pATable,
q15_t pBTable,
q15_t pDst,
uint32_t  modifier 
)

end of RealFFT group

Parameters
*pSrcpoints to the input buffer.
fftLenlength of FFT.
*pATablepoints to the A twiddle Coef buffer.
*pBTablepoints to the B twiddle Coef buffer.
*pDstpoints to the output buffer.
modifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
Returns
none. The function implements a Real FFT

References __SIMD32.

Referenced by arm_rfft_q15().

void arm_split_rifft_q15 ( q15_t pSrc,
uint32_t  fftLen,
q15_t pATable,
q15_t pBTable,
q15_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. The function implements a Real IFFT

References __SIMD32.

Referenced by arm_rfft_q15().