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Altera_Forum's avatar
Altera_Forum
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15 years ago

fft code in c

hello everyone, I am working on speech recognition projet using nios 2. I need simple fft code in c to run on the nios. did anyone know where can i found one?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I have a question regarding the software fft funtion.

Can someone explain what exactly are they doing here: 


InputData = InData >> FFT_SIZE;

It looks like they are shifting the input to the right by 8 bits, but won't that simply discard the lower 2 digits of the number? Or are they trying to divide each input number by 256?

Another thing, if I have only the real values as input data, then do I have to add a 0 after each number to account for the missing imaginary data?