arm_dct4_instance_q31 Struct Reference

Instance structure for the Q31 DCT4/IDCT4 function.

Data Fields
uint16_t	N
uint16_t	Nby2
q31_t	normalize
const q31_t *	pTwiddle
const q31_t *	pCosFactor
arm_rfft_instance_q31 *	pRfft
arm_cfft_radix4_instance_q31 *	pCfft

Field Documentation

N

uint16_t N

length of the DCT4.

Nby2

uint16_t Nby2

half of the length of the DCT4.

normalize

q31_t normalize

normalizing factor.

pCfft

arm_cfft_radix4_instance_q31* pCfft

points to the complex FFT instance.

pCosFactor

const q31_t* pCosFactor

points to the cosFactor table.

pRfft

arm_rfft_instance_q31* pRfft

points to the real FFT instance.

pTwiddle

const q31_t* pTwiddle

points to the twiddle factor table.