Real FFT TablesReal FFT Functions

Variables

static const float32_t realCoefA [8192]
 
static const float32_t realCoefB [8192]
 
const q15_t ALIGN4 realCoefAQ15 [8192]
 
const q15_t ALIGN4 realCoefBQ15 [8192]
 
const q31_t realCoefAQ31 [8192]
 
const q31_t realCoefBQ31 [8192]
 

Description

Variable Documentation

const float32_t realCoefA[8192]
static
Generation of realCoefA array:
n = 4096
for (i = 0; i < n; i++)
 {
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

Referenced by arm_rfft_init_f32().

const q15_t ALIGN4 realCoefAQ15[8192]
Generation fixed-point realCoefAQ15 array in Q15 format:
n = 4096
for (i = 0; i < n; i++)
 {
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 
Convert to fixed point Q15 format round(pATable[i] * pow(2, 15))

Referenced by arm_rfft_init_q15().

const q31_t realCoefAQ31[8192]
Generation fixed-point realCoefAQ31 array in Q31 format:
n = 4096
for (i = 0; i < n; i++)
{
   pATable[2 * i] = 0.5 * (1.0 - sin (2 * PI / (double) (2 * n) * (double) i));
   pATable[2 * i + 1] = 0.5 * (-1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
}
Convert to fixed point Q31 format round(pATable[i] * pow(2, 31))

Referenced by arm_rfft_init_q31().

const float32_t realCoefB[8192]
static
Generation of realCoefB array:
n = 4096
for (i = 0; i < n; i++)
{
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 

Referenced by arm_rfft_init_f32().

const q15_t ALIGN4 realCoefBQ15[8192]
Generation of real_CoefB array:
n = 4096
for (i = 0; i < n; i++)
 {
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
 } 
Convert to fixed point Q15 format round(pBTable[i] * pow(2, 15))

Referenced by arm_rfft_init_q15().

const q31_t realCoefBQ31[8192]
Generation of realCoefBQ31 array:
n = 4096
for (i = 0; i < n; i++)
{
   pBTable[2 * i] = 0.5 * (1.0 + sin (2 * PI / (double) (2 * n) * (double) i));
   pBTable[2 * i + 1] = 0.5 * (1.0 * cos (2 * PI / (double) (2 * n) * (double) i));
} 
Convert to fixed point Q31 format round(pBTable[i] * pow(2, 31))

Referenced by arm_rfft_init_q31().