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Altera_Forum's avatar
Altera_Forum
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16 years ago

what's wrong with my fft ipcore

I have instantiated a 256 points FFT, with single output and streaming architecture. The data width and twiddle factor precision is 16bits. I input the signals generated by matlab: n=0:2047; s...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Thanks for your reply.

But I still have one question.

In the case of Matlab fft,I get source_imag from its fft: nearly zeros.This is the right fft output.but in the quartus altera fft ip core,the

source_real 16068 is right,but the source_imag -3196.even if the exponent is -1,it's still too large.It should be almost zeros.