CMSIS-DSP  Version 1.4.4
CMSIS DSP Software Library
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
arm_cfft_radix4_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.
 
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.
 
void arm_bitreversal_q31 (q31_t *pSrc, uint32_t fftLen, uint16_t bitRevFactor, uint16_t *pBitRevTab)
 
void arm_cfft_radix4_q31 (const arm_cfft_radix4_instance_q31 *S, q31_t *pSrc)
 Processing function for the Q31 CFFT/CIFFT.
 

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_q31(), arm_cfft_radix4_q31(), and arm_cfft_radix4by2_inverse_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_q31(), arm_cfft_radix4_q31(), and arm_cfft_radix4by2_q31().