Real FFT Tables

const float32_t realCoefA[8192]

const float32_t realCoefB[8192]

const q31_t realCoefAQ31[8192]

const q31_t realCoefBQ31[8192]

const q15_t __ALIGNED (4)

group RealFFT_Table

Functions

const q15_t __ALIGNED (4)

Weights Table.

Q15 table for reciprocal.

end of DCT4_IDCT4_Table group

Generation fixed-point realCoefAQ15 array in Q15 format:

n = 4096

Convert to fixed point Q15 format round(pATable[i] * pow(2, 15))

Generation of real_CoefB array:

n = 4096

Convert to fixed point Q15 format round(pBTable[i] * pow(2, 15))

Weights tables are generated using the formula :

C command to generate the table

where N is the Number of weights to be calculated and c is pi/(2*N)

Converted the output to q15 format by multiplying with 2^31 and saturated if required.

In the tables below the real and imaginary values are placed alternatively, hence the array length is 2*N.

cosFactor tables are generated using the formula :

C command to generate the table

where N is the number of factors to generate and c is pi/(2*N)

Then converted to q15 format by multiplying with 2^31 and saturated if required.

Variables

const float32_t realCoefA[8192]

Generation of realCoefA array:

n = 4096

const float32_t realCoefB[8192]

Generation of realCoefB array:

n = 4096

const q31_t realCoefAQ31[8192]

Generation fixed-point realCoefAQ31 array in Q31 format:

n = 4096

Convert to fixed point Q31 format round(pATable[i] * pow(2, 31))

const q31_t realCoefBQ31[8192]

Generation of realCoefBQ31 array:

n = 4096

Convert to fixed point Q31 format round(pBTable[i] * pow(2, 31))