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]	pSrc	points to in-place floating-point data buffer
[in]	fftSize	length of FFT
[in]	bitRevFactor	bit reversal modifier that supports different size FFTs with the same bit reversal table
[in]	pBitRevTab	points 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]	pSrc	points to input buffer
[in]	fftLen	length of FFT
[in]	pATable	points to twiddle Coef A buffer
[in]	pBTable	points to twiddle Coef B buffer
[out]	pDst	points to output buffer
[in]	modifier	twiddle 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]	pSrc	points to input buffer
[in]	fftLen	length of FFT
[in]	pATable	points to twiddle Coef A buffer
[in]	pBTable	points to twiddle Coef B buffer
[out]	pDst	points to output buffer
[in]	modifier	twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table

Returns

none