Robert Lopez / CMSIS5

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Real FFT Tables
Variables

Real FFT Tables
[Real 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]

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));
  }

Definition at line 51 of file arm_rfft_init_f32.c.

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))

Definition at line 56 of file arm_rfft_init_q15.c.

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))

Definition at line 56 of file arm_rfft_init_q31.c.

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));
  }

Definition at line 2115 of file arm_rfft_init_f32.c.

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))

Definition at line 1098 of file arm_rfft_init_q15.c.

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))

Definition at line 2124 of file arm_rfft_init_q31.c.

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