Re: problem about dsplib real fft | TMS320C54x

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).

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Hi James, Try using unpacki before calling the cbrev as rifft takes in real input. VN _________________ > > Message: 2 > Date: Tue, 13 Aug 2002 12:37:56 -0000 > From: "jamesztyou" <> > Subject: Q: problem about dsplib real fft > > I had searched the former msgs, but can not find > answer. so I post a > help message again. > follow is the test code where FFTSZ is a const > integer 256, noscale > defined as 0, scale defined as 1; and rfftws is an > Uns array header, > pointed to a 256 elements' Uns array, rfftws equals > 0x1200(cording to > myout.map), data are in Q15 format. > > //rfft > cbrev( rfftws, rfftws, FFTSZ/2 ); > rfft ( rfftws, FFTSZ, noscale ); > > //do actual processing. > > //rifft > cbrev( rfftws, rfftws, FFTSZ/2 ); > rifft( rfftws, FFTSZ, scale ); > > and here is the question, the result is quite > different from the > former datas... help.. __________________________________________________

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thanks. now it works. and I also find the example in the c5500 smaple directory. but I wonder why ccs still use the out of date c5400 example. ... --- In c54x@y..., Vasudev Nayak <vasudevns@y...> wrote: > Hi James, > Try using unpacki before calling the cbrev as rifft > takes in real input. > VN

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Discussion Groups | TMS320C54x | Re: problem about dsplib real fft

Re: problem about dsplib real fft - Vasudev Nayak - Aug 15 19:16:00 2002

Re: problem about dsplib real fft - jamesztyou - Aug 16 14:19:00 2002