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Complex FFT Tables
Variables

Complex FFT Tables
[Complex FFT Functions]

Variables

const uint16_t armBitRevTable [1024]
const float32_t twiddleCoef_16 [32]
const float32_t twiddleCoef_32 [64]
const float32_t twiddleCoef_64 [128]
const float32_t twiddleCoef_128 [256]
const float32_t twiddleCoef_256 [512]
const float32_t twiddleCoef_512 [1024]
const float32_t twiddleCoef_1024 [2048]
const float32_t twiddleCoef_2048 [4096]
const float32_t twiddleCoef_4096 [8192]
const q31_t twiddleCoef_16_q31 [24]
const q31_t twiddleCoef_32_q31 [48]
const q31_t twiddleCoef_64_q31 [96]
const q31_t twiddleCoef_128_q31 [192]
const q31_t twiddleCoef_256_q31 [384]
const q31_t twiddleCoef_512_q31 [768]
const q31_t twiddleCoef_1024_q31 [1536]
const q31_t twiddleCoef_2048_q31 [3072]
const q31_t twiddleCoef_4096_q31 [6144]
const q15_t twiddleCoef_16_q15 [24]
const q15_t twiddleCoef_32_q15 [48]
const q15_t twiddleCoef_64_q15 [96]
const q15_t twiddleCoef_128_q15 [192]
const q15_t twiddleCoef_256_q15 [384]
const q15_t twiddleCoef_512_q15 [768]
const q15_t twiddleCoef_1024_q15 [1536]
const q15_t twiddleCoef_2048_q15 [3072]
const q15_t twiddleCoef_4096_q15 [6144]

Variable Documentation

const uint16_t armBitRevTable[1024]
Pseudo code for Generation of Bit reversal Table is 
for(l=1;l <= N/4;l++)
 {
   for(i=0;i<logN2;i++)
   {
     a[i]=l&(1<<i);
   }
   for(j=0; j<logN2; j++)
   {
     if (a[j]!=0)
     y[l]+=(1<<((logN2-1)-j));
   }
   y[l] = y[l] >> 1;
  }
where N = 4096 logN2 = 12
N is the maximum FFT Size supported

Definition at line 67 of file arm_common_tables.c.

const float32_t twiddleCoef_1024[2048]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 1024 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 1309 of file arm_common_tables.c.

const q15_t twiddleCoef_1024_q15[1536]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 1024 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 13358 of file arm_common_tables.c.

const q31_t twiddleCoef_1024_q31[1536]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 1024 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 9181 of file arm_common_tables.c.

const float32_t twiddleCoef_128[256]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 128 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 360 of file arm_common_tables.c.

const q15_t twiddleCoef_128_q15[192]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 128 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 12959 of file arm_common_tables.c.

const q31_t twiddleCoef_128_q31[192]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 128 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8670 of file arm_common_tables.c.

const float32_t twiddleCoef_16[32]
Initial value:
 {
    1.000000000f,  0.000000000f,
    0.923879533f,  0.382683432f,
    0.707106781f,  0.707106781f,
    0.382683432f,  0.923879533f,
    0.000000000f,  1.000000000f,
   -0.382683432f,  0.923879533f,
   -0.707106781f,  0.707106781f,
   -0.923879533f,  0.382683432f,
   -1.000000000f,  0.000000000f,
   -0.923879533f, -0.382683432f,
   -0.707106781f, -0.707106781f,
   -0.382683432f, -0.923879533f,
   -0.000000000f, -1.000000000f,
    0.382683432f, -0.923879533f,
    0.707106781f, -0.707106781f,
    0.923879533f, -0.382683432f
}
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 16 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 193 of file arm_common_tables.c.

const q15_t twiddleCoef_16_q15[24]
Initial value:
 {
    (q15_t)0x7FFF, (q15_t)0x0000,
    (q15_t)0x7641, (q15_t)0x30FB,
    (q15_t)0x5A82, (q15_t)0x5A82,
    (q15_t)0x30FB, (q15_t)0x7641,
    (q15_t)0x0000, (q15_t)0x7FFF,
    (q15_t)0xCF04, (q15_t)0x7641,
    (q15_t)0xA57D, (q15_t)0x5A82,
    (q15_t)0x89BE, (q15_t)0x30FB,
    (q15_t)0x8000, (q15_t)0x0000,
    (q15_t)0x89BE, (q15_t)0xCF04,
    (q15_t)0xA57D, (q15_t)0xA57D,
    (q15_t)0xCF04, (q15_t)0x89BE
}
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 16 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 12836 of file arm_common_tables.c.

const q31_t twiddleCoef_16_q31[24]
Initial value:
 {
    (q31_t)0x7FFFFFFF, (q31_t)0x00000000,
    (q31_t)0x7641AF3C, (q31_t)0x30FBC54D,
    (q31_t)0x5A82799A, (q31_t)0x5A82799A,
    (q31_t)0x30FBC54D, (q31_t)0x7641AF3C,
    (q31_t)0x00000000, (q31_t)0x7FFFFFFF,
    (q31_t)0xCF043AB2, (q31_t)0x7641AF3C,
    (q31_t)0xA57D8666, (q31_t)0x5A82799A,
    (q31_t)0x89BE50C3, (q31_t)0x30FBC54D,
    (q31_t)0x80000000, (q31_t)0x00000000,
    (q31_t)0x89BE50C3, (q31_t)0xCF043AB2,
    (q31_t)0xA57D8666, (q31_t)0xA57D8666,
    (q31_t)0xCF043AB2, (q31_t)0x89BE50C3
}
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 16 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8539 of file arm_common_tables.c.

const float32_t twiddleCoef_2048[4096]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 2048 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 2351 of file arm_common_tables.c.

const q15_t twiddleCoef_2048_q15[3072]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 2048 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 13763 of file arm_common_tables.c.

const q31_t twiddleCoef_2048_q31[3072]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 2048 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 9714 of file arm_common_tables.c.

const float32_t twiddleCoef_256[512]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 256 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 506 of file arm_common_tables.c.

const q15_t twiddleCoef_256_q15[384]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 256 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 13028 of file arm_common_tables.c.

const q31_t twiddleCoef_256_q31[384]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 256 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8755 of file arm_common_tables.c.

const float32_t twiddleCoef_32[64]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 32 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 227 of file arm_common_tables.c.

const q15_t twiddleCoef_32_q15[48]
Initial value:
 {
    (q15_t)0x7FFF, (q15_t)0x0000,
    (q15_t)0x7D8A, (q15_t)0x18F8,
    (q15_t)0x7641, (q15_t)0x30FB,
    (q15_t)0x6A6D, (q15_t)0x471C,
    (q15_t)0x5A82, (q15_t)0x5A82,
    (q15_t)0x471C, (q15_t)0x6A6D,
    (q15_t)0x30FB, (q15_t)0x7641,
    (q15_t)0x18F8, (q15_t)0x7D8A,
    (q15_t)0x0000, (q15_t)0x7FFF,
    (q15_t)0xE707, (q15_t)0x7D8A,
    (q15_t)0xCF04, (q15_t)0x7641,
    (q15_t)0xB8E3, (q15_t)0x6A6D,
    (q15_t)0xA57D, (q15_t)0x5A82,
    (q15_t)0x9592, (q15_t)0x471C,
    (q15_t)0x89BE, (q15_t)0x30FB,
    (q15_t)0x8275, (q15_t)0x18F8,
    (q15_t)0x8000, (q15_t)0x0000,
    (q15_t)0x8275, (q15_t)0xE707,
    (q15_t)0x89BE, (q15_t)0xCF04,
    (q15_t)0x9592, (q15_t)0xB8E3,
    (q15_t)0xA57D, (q15_t)0xA57D,
    (q15_t)0xB8E3, (q15_t)0x9592,
    (q15_t)0xCF04, (q15_t)0x89BE,
    (q15_t)0xE707, (q15_t)0x8275
}
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 32 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 12869 of file arm_common_tables.c.

const q31_t twiddleCoef_32_q31[48]
Initial value:
 {
    (q31_t)0x7FFFFFFF, (q31_t)0x00000000,
    (q31_t)0x7D8A5F3F, (q31_t)0x18F8B83C,
    (q31_t)0x7641AF3C, (q31_t)0x30FBC54D,
    (q31_t)0x6A6D98A4, (q31_t)0x471CECE6,
    (q31_t)0x5A82799A, (q31_t)0x5A82799A,
    (q31_t)0x471CECE6, (q31_t)0x6A6D98A4,
    (q31_t)0x30FBC54D, (q31_t)0x7641AF3C,
    (q31_t)0x18F8B83C, (q31_t)0x7D8A5F3F,
    (q31_t)0x00000000, (q31_t)0x7FFFFFFF,
    (q31_t)0xE70747C3, (q31_t)0x7D8A5F3F,
    (q31_t)0xCF043AB2, (q31_t)0x7641AF3C,
    (q31_t)0xB8E31319, (q31_t)0x6A6D98A4,
    (q31_t)0xA57D8666, (q31_t)0x5A82799A,
    (q31_t)0x9592675B, (q31_t)0x471CECE6,
    (q31_t)0x89BE50C3, (q31_t)0x30FBC54D,
    (q31_t)0x8275A0C0, (q31_t)0x18F8B83C,
    (q31_t)0x80000000, (q31_t)0x00000000,
    (q31_t)0x8275A0C0, (q31_t)0xE70747C3,
    (q31_t)0x89BE50C3, (q31_t)0xCF043AB2,
    (q31_t)0x9592675B, (q31_t)0xB8E31319,
    (q31_t)0xA57D8666, (q31_t)0xA57D8666,
    (q31_t)0xB8E31319, (q31_t)0x9592675B,
    (q31_t)0xCF043AB2, (q31_t)0x89BE50C3,
    (q31_t)0xE70747C3, (q31_t)0x8275A0C0
}
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 32 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8572 of file arm_common_tables.c.

const float32_t twiddleCoef_4096[8192]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 4096 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 4417 of file arm_common_tables.c.

const q15_t twiddleCoef_4096_q15[6144]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 4096 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 14552 of file arm_common_tables.c.

const q31_t twiddleCoef_4096_q31[6144]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 4096 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 10759 of file arm_common_tables.c.

const float32_t twiddleCoef_512[1024]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 512 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 780 of file arm_common_tables.c.

const q15_t twiddleCoef_512_q15[768]
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 512 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 13145 of file arm_common_tables.c.

const q31_t twiddleCoef_512_q31[768]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 512 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8904 of file arm_common_tables.c.

const float32_t twiddleCoef_64[128]
Example code for Floating-point Twiddle factors Generation: 
for(i = 0; i< N/; i++)
 {
	twiddleCoef[2*i]= cos(i * 2*PI/(float)N);
	twiddleCoef[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 64 and PI = 3.14159265358979
Cos and Sin values are in interleaved fashion

Definition at line 277 of file arm_common_tables.c.

const q15_t twiddleCoef_64_q15[96]
Initial value:
 {
    (q15_t)0x7FFF, (q15_t)0x0000, (q15_t)0x7F62, (q15_t)0x0C8B,
    (q15_t)0x7D8A, (q15_t)0x18F8, (q15_t)0x7A7D, (q15_t)0x2528,
    (q15_t)0x7641, (q15_t)0x30FB, (q15_t)0x70E2, (q15_t)0x3C56,
    (q15_t)0x6A6D, (q15_t)0x471C, (q15_t)0x62F2, (q15_t)0x5133,
    (q15_t)0x5A82, (q15_t)0x5A82, (q15_t)0x5133, (q15_t)0x62F2,
    (q15_t)0x471C, (q15_t)0x6A6D, (q15_t)0x3C56, (q15_t)0x70E2,
    (q15_t)0x30FB, (q15_t)0x7641, (q15_t)0x2528, (q15_t)0x7A7D,
    (q15_t)0x18F8, (q15_t)0x7D8A, (q15_t)0x0C8B, (q15_t)0x7F62,
    (q15_t)0x0000, (q15_t)0x7FFF, (q15_t)0xF374, (q15_t)0x7F62,
    (q15_t)0xE707, (q15_t)0x7D8A, (q15_t)0xDAD7, (q15_t)0x7A7D,
    (q15_t)0xCF04, (q15_t)0x7641, (q15_t)0xC3A9, (q15_t)0x70E2,
    (q15_t)0xB8E3, (q15_t)0x6A6D, (q15_t)0xAECC, (q15_t)0x62F2,
    (q15_t)0xA57D, (q15_t)0x5A82, (q15_t)0x9D0D, (q15_t)0x5133,
    (q15_t)0x9592, (q15_t)0x471C, (q15_t)0x8F1D, (q15_t)0x3C56,
    (q15_t)0x89BE, (q15_t)0x30FB, (q15_t)0x8582, (q15_t)0x2528,
    (q15_t)0x8275, (q15_t)0x18F8, (q15_t)0x809D, (q15_t)0x0C8B,
    (q15_t)0x8000, (q15_t)0x0000, (q15_t)0x809D, (q15_t)0xF374,
    (q15_t)0x8275, (q15_t)0xE707, (q15_t)0x8582, (q15_t)0xDAD7,
    (q15_t)0x89BE, (q15_t)0xCF04, (q15_t)0x8F1D, (q15_t)0xC3A9,
    (q15_t)0x9592, (q15_t)0xB8E3, (q15_t)0x9D0D, (q15_t)0xAECC,
    (q15_t)0xA57D, (q15_t)0xA57D, (q15_t)0xAECC, (q15_t)0x9D0D,
    (q15_t)0xB8E3, (q15_t)0x9592, (q15_t)0xC3A9, (q15_t)0x8F1D,
    (q15_t)0xCF04, (q15_t)0x89BE, (q15_t)0xDAD7, (q15_t)0x8582,
    (q15_t)0xE707, (q15_t)0x8275, (q15_t)0xF374, (q15_t)0x809D
}
Example code for q15 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefq15[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefq15[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 64 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to q15(Fixed point 1.15): round(twiddleCoefq15(i) * pow(2, 15))

Definition at line 12914 of file arm_common_tables.c.

const q31_t twiddleCoef_64_q31[96]
Example code for Q31 Twiddle factors Generation:: 
for(i = 0; i< 3N/4; i++)
 {
    twiddleCoefQ31[2*i]= cos(i * 2*PI/(float)N);
    twiddleCoefQ31[2*i+1]= sin(i * 2*PI/(float)N);
 }
where N = 64 and PI = 3.14159265358979
Cos and Sin values are interleaved fashion
Convert Floating point to Q31(Fixed point 1.31): round(twiddleCoefQ31(i) * pow(2, 31))

Definition at line 8617 of file arm_common_tables.c.

Generated on Tue Jul 12 2022 16:47:30 by  doxygen 1.7.2