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Discussion Groups | Analog Devices DSPs | Re: AW: Real Symmetric FFT
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
Re: AW: Real Symmetric FFT - Jeff Brower - Dec 9 14:50:00 2003
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Andor- > > > the source code for the Real FFT can be downloaded from ADI. It > > > implements a real N-point FFT using a N/2-point complex FFT, plus > > > some signal reassembling. > > > > > > If the input signal is however real _and_ symmetric (as is the case > > > for a linear-phase frequency response), additional speed-up can be > > > achieved as compared to the Real FFT, because the resulting > > imaginary > > > part does not have to be calculated. > > > > Just curious, but how can a real signal in time domain be > > symmetric? > > Hi Jeff, > > the signal is not in time domain. The application is frequency sampling > FIR design (I mentioned this in the original post). That application does not do "FFT of an FFT", so your explanation is still not clear. -Jeff |
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