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arm_rfft_instance_q31 Struct Reference

arm_rfft_instance_q31 Struct Reference

Instance structure for the Q31 RFFT/RIFFT function. More...

#include <arm_math.h>

Data Fields

uint32_t fftLenReal
 length of the real FFT.
uint32_t fftLenBy2
 length of the complex FFT.
uint8_t ifftFlagR
 flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.
uint8_t bitReverseFlagR
 flag that enables (bitReverseFlagR=1) or disables (bitReverseFlagR=0) bit reversal of output.
uint32_t twidCoefRModifier
 twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.
q31_t * pTwiddleAReal
 points to the real twiddle factor table.
q31_t * pTwiddleBReal
 points to the imag twiddle factor table.
arm_cfft_radix4_instance_q31pCfft
 points to the complex FFT instance.

Detailed Description

Instance structure for the Q31 RFFT/RIFFT function.

Definition at line 2106 of file arm_math.h.


Field Documentation

uint8_t bitReverseFlagR

flag that enables (bitReverseFlagR=1) or disables (bitReverseFlagR=0) bit reversal of output.

Definition at line 2111 of file arm_math.h.

uint32_t fftLenBy2

length of the complex FFT.

Definition at line 2109 of file arm_math.h.

uint32_t fftLenReal

length of the real FFT.

Definition at line 2108 of file arm_math.h.

uint8_t ifftFlagR

flag that selects forward (ifftFlagR=0) or inverse (ifftFlagR=1) transform.

Definition at line 2110 of file arm_math.h.

points to the complex FFT instance.

Definition at line 2115 of file arm_math.h.

q31_t* pTwiddleAReal

points to the real twiddle factor table.

Definition at line 2113 of file arm_math.h.

q31_t* pTwiddleBReal

points to the imag twiddle factor table.

Definition at line 2114 of file arm_math.h.

twiddle coefficient modifier that supports different size FFTs with the same twiddle factor table.

Definition at line 2112 of file arm_math.h.