CMSIS-DSP  Version 1.10.0
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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_tpTwiddle
const q31_tpCosFactor

Field Documentation

uint16_t N

length of the DCT4.

uint16_t Nby2

half of the length of the DCT4.

q31_t normalize

normalizing factor.

points to the complex FFT instance.

const q31_t* pCosFactor

points to the cosFactor table.

points to the real FFT instance.

const q31_t* pTwiddle

points to the twiddle factor table.