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Discussion Groups | TMS320C54x | dsplib rifft: can't get it working
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).
dsplib rifft: can't get it working - lolo_mk1 - Jun 20 1:21:00 2005
Hi,
I've read past posts on this topic but I can't make the dsplib
inverse fft work properly.
I put it in a 360Hz sine wave @ 8kHz sampling rate. I get the
desired spike in the magnitude spectrum via
cbrev(*in, *out, FFTORDER/2);
rfft1024(*out, 1);
//my little magnituding finding function goes here
so I'm sure thats working. then...
unpacki_1024(*out);
cbrev(*out, *in, FFTORDER/2);
rifft1024(*in, 1);
the resulting amp/time graph is completely distorted with very high
frequency components introduced.
I checked and I do have the latest dsplib files. I've also tried
applying a hann window on the initial data to avoid spectral
widening. in and out are also aligned to 2048.
Can anyone see whats wrong here??
Thanks
Aaron
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