[vorbis-dev] More mdct questions

[Dave, Anish]

Hey thanks for your help!  Your equation works.  It's the same as the one
given in the eusipco.corrected.ps document minus the 4/n term outside the
summation.  So was that (4/n) term the typo in the document?

Are there any typos in the FFT algorithm described?  If so, what are they?
I wasn't able to tell by comparing the vorbis code to the algorithm in the
paper (I'm not a dsp/fft/dct guru).

Thanks!

> -----Original Message-----
> From: Segher Boessenkool [mailto:segher at wanadoo.nl]
> Sent: Monday, October 23, 2000 4:00 PM
> To: vorbis-dev at xiph.org
> Subject: Re: [vorbis-dev] More mdct questions
> 
> 
> > > > b_k = sum(j=0..4N-1) a_j * w_j * cos( (2k+1)(2j+1+-N) * 
> PI / 8N ) // forward
> > > > a_j = w_j * sum(k=0..2N-1) b_k * cos( (2k+1)(2j+1+-N) * 
> PI / 8N ) // backward
> 
> Oh, and maybe +-2N instead of +-N
> 
> Math on a keyboard is kind of difficult, especially when the audience
> don't all
> speak TeX. Anyway, go to Google and search for mdct (or dct IV). You
> will find it.
> 
> Ciao,
> 
> Segher
> 
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