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Discussion Groups | TMS320C54x | FFT , IFFT and DSPlib
Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).
FFT , IFFT and DSPlib - Curl - Dec 4 16:41:00 2001
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Hello .. I'm not a C programmer, and i have little experience in this langage. I'd like to ask a question to people who use the dsp library. To perform an FFT followed by an Inverse FFT, I implement in assembly language a "packing fft algorithm" The input, x(n), is a 2N real sequence Here are the steps for this algorithm : 1) Bit reverse 2) Complex FFT (on N points) 3) "unpacking" (N points complex spectrum -> 2N point complex spectrum ) At this point i have X(k) the spectrum of x(n) 4) "packing" (2N points complex spectrum -> N point complex spectrum ) 5) Bit reverse 6) Complex IFFT (or conjugate+complex FFT+conjugate) on N points At this point i'm back with x(n) It works.. (I have still problems since it is 16 bits precision, but that's not the point) I'd like to do the same thing in C language..What are the steps in C : 1) cbrev and 2) rfft to get X(k) .. and then ?? Thank you... |
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