end of RealFFT_Table group
◆ cos_factors_128
◆ cos_factors_2048
◆ cos_factors_512
◆ cos_factors_8192
◆ cos_factorsQ15_128
| const q15_t cos_factorsQ15_128[128] |
◆ cos_factorsQ15_2048
| const q15_t cos_factorsQ15_2048[2048] |
◆ cos_factorsQ15_512
| const q15_t cos_factorsQ15_512[512] |
◆ cos_factorsQ15_8192
| const q15_t cos_factorsQ15_8192[8192] |
◆ cos_factorsQ31_128
| const q31_t cos_factorsQ31_128[128] |
◆ cos_factorsQ31_2048
| const q31_t cos_factorsQ31_2048[2048] |
◆ cos_factorsQ31_512
| const q31_t cos_factorsQ31_512[512] |
◆ cos_factorsQ31_8192
| const q31_t cos_factorsQ31_8192[8192] |
◆ Weights_128
- Weights tables are generated using the formula :
weights[n] = e^(-j*n*pi/(2*N))
- C command to generate the table
for(i = 0; i< N; i++)
{
weights[(2*i)] = cos (i*c);
weights[(2*i)+1] = -sin (i*c);
}
- where
N is the Number of weights to be calculated and c is pi/(2*N)
- 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 :
cos_factors[n] = 2 * cos((2n+1)*pi/(4*N))
- C command to generate the table
for(i = 0; i< N; i++)
{
cos_factors[i]= 2 * cos((2*i+1)*c/2);
}
- where
N is the number of factors to generate and c is pi/(2*N)
◆ Weights_2048
◆ Weights_512
◆ Weights_8192
◆ WeightsQ15_128
| const q15_t WeightsQ15_128[256] |
- Weights tables are generated using the formula :
weights[n] = e^(-j*n*pi/(2*N))
- C command to generate the table
for(i = 0; i< N; i++)
{
weights[(2*i)] = cos(i*c);
weights[(2*i)+1] = -sin(i*c);
}
- 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 :
cos_factors[n] = 2 * cos((2n+1)*pi/(4*N))
- C command to generate the table
for (i = 0; i< N; i++)
{
cos_factors[i] = 2 * cos((2*i+1)*c/2);
}
- 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.
◆ WeightsQ15_2048
| const q15_t WeightsQ15_2048[4096] |
◆ WeightsQ15_512
| const q15_t WeightsQ15_512[1024] |
◆ WeightsQ15_8192
| const q15_t WeightsQ15_8192[16384] |
◆ WeightsQ31_128
| const q31_t WeightsQ31_128[256] |
- Weights tables are generated using the formula :
weights[n] = e^(-j*n*pi/(2*N))
- C command to generate the table
for (i = 0; i< N; i++)
{
weights[(2*i)] = cos(i*c);
weights[(2*i)+1] = -sin(i*c);
}
- where
N is the Number of weights to be calculated and c is pi/(2*N)
- Convert the output to q31 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 :
cos_factors[n] = 2 * cos((2n+1)*pi/(4*N))
- C command to generate the table
for (i = 0; i< N; i++)
{
cos_factors[i] = 2 * cos((2*i+1)*c/2);
}
- where
N is the number of factors to generate and c is pi/(2*N)
- Then converted to q31 format by multiplying with 2^31 and saturated if required.
◆ WeightsQ31_2048
| const q31_t WeightsQ31_2048[4096] |
◆ WeightsQ31_512
| const q31_t WeightsQ31_512[1024] |
◆ WeightsQ31_8192
| const q31_t WeightsQ31_8192[16384] |
