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arm_rfft_f32.c File Reference

Functions

void arm_radix4_butterfly_f32 (float32_t *pSrc, uint16_t fftLen, const float32_t *pCoef, uint16_t twidCoefModifier)
 
void arm_radix4_butterfly_inverse_f32 (float32_t *pSrc, uint16_t fftLen, const float32_t *pCoef, uint16_t twidCoefModifier, float32_t onebyfftLen)
 
void arm_bitreversal_f32 (float32_t *pSrc, uint16_t fftSize, uint16_t bitRevFactor, const uint16_t *pBitRevTab)
 In-place floating-point bit reversal function. More...
 
void arm_split_rfft_f32 (float32_t *pSrc, uint32_t fftLen, const float32_t *pATable, const float32_t *pBTable, float32_t *pDst, uint32_t modifier)
 Core Real FFT process. More...
 
void arm_split_rifft_f32 (float32_t *pSrc, uint32_t fftLen, const float32_t *pATable, const float32_t *pBTable, float32_t *pDst, uint32_t modifier)
 Core Real IFFT process. More...
 
void arm_rfft_f32 (const arm_rfft_instance_f32 *S, float32_t *pSrc, float32_t *pDst)
 Processing function for the floating-point RFFT/RIFFT. Source buffer is modified by this function. More...
 

Function Documentation

void arm_bitreversal_f32 ( float32_t pSrc,
uint16_t  fftSize,
uint16_t  bitRevFactor,
const uint16_t *  pBitRevTab 
)
Parameters
[in,out]pSrcpoints to in-place floating-point data buffer
[in]fftSizelength of FFT
[in]bitRevFactorbit reversal modifier that supports different size FFTs with the same bit reversal table
[in]pBitRevTabpoints to bit reversal table
Returns
none
void arm_radix4_butterfly_f32 ( float32_t pSrc,
uint16_t  fftLen,
const float32_t pCoef,
uint16_t  twidCoefModifier 
)

end of ComplexFFT group brief Core function for the floating-point CFFT butterfly process. param[in,out] pSrc points to the in-place buffer of floating-point data type param[in] fftLen length of the FFT param[in] pCoef points to the twiddle coefficient buffer param[in] twidCoefModifier twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table return none

void arm_radix4_butterfly_inverse_f32 ( float32_t pSrc,
uint16_t  fftLen,
const float32_t pCoef,
uint16_t  twidCoefModifier,
float32_t  onebyfftLen 
)

brief Core function for the floating-point CIFFT butterfly process. param[in,out] pSrc points to the in-place buffer of floating-point data type param[in] fftLen length of the FFT param[in] pCoef points to twiddle coefficient buffer param[in] twidCoefModifier twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table. param[in] onebyfftLen value of 1/fftLen return none

void arm_split_rfft_f32 ( float32_t pSrc,
uint32_t  fftLen,
const float32_t pATable,
const float32_t pBTable,
float32_t pDst,
uint32_t  modifier 
)

end of RealFFT group

Parameters
[in]pSrcpoints to input buffer
[in]fftLenlength of FFT
[in]pATablepoints to twiddle Coef A buffer
[in]pBTablepoints to twiddle Coef B buffer
[out]pDstpoints to output buffer
[in]modifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table
Returns
none
void arm_split_rifft_f32 ( float32_t pSrc,
uint32_t  fftLen,
const float32_t pATable,
const float32_t pBTable,
float32_t pDst,
uint32_t  modifier 
)
Parameters
[in]pSrcpoints to input buffer
[in]fftLenlength of FFT
[in]pATablepoints to twiddle Coef A buffer
[in]pBTablepoints to twiddle Coef B buffer
[out]pDstpoints to output buffer
[in]modifiertwiddle coefficient modifier that supports different size FFTs with the same twiddle factor table
Returns
none