> Hi all
>
> I am strugling to get real valued output from a IFFT from a complex valued
> input. I know if the complex input is aligned using hermitian symmetry, the
> output must be only real valued.
Use an IFFT that is designed for hermitian symmetric input. In that
case, you don't have to worry about it yourself.
> My question is how to align the values hermitially. For example:
>
> If my input is:
> 1+2j; 2+3j; 5+j; 7+2j
>
> How do one align this hermitally?
> I have tried the following two approaches but neither seem to work.
>
> 1+2j; 2+3j; 5+j; 7+2j; 7+2j; 5+j; 2+3j; 1+2j;
Remember that an N-point real FFT gives you N/2+1 distinct complex
values (where the first and the last value is real). So a Hermitian
symmetric output from an 8-point real FFT might look like this:
1; 2+3j; 5+j; 7+2j; 9; 7-2j; 5-j; 2-3j;
The imaginary part of the IFFT array will contain some numerical noise
that you can ignore.
Regards,
Andor
Reply by s22139584●July 14, 20052005-07-14
Hi all
I am strugling to get real valued output from a IFFT from a complex valued
input. I know if the complex input is aligned using hermitian symmetry, the
output must be only real valued.
My question is how to align the values hermitially. For example:
If my input is:
1+2j; 2+3j; 5+j; 7+2j
How do one align this hermitally?
I have tried the following two approaches but neither seem to work.
1+2j; 2+3j; 5+j; 7+2j; 7+2j; 5+j; 2+3j; 1+2j;
and
1+2j; 2+3j; 5+j; 7+2j; 5+j; 2+3j; 1+2j;
Does anyone know...
Thanks
Jaco
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