[vorbis-dev] mdct question

Michael Smith msmith at labyrinth.net.au
Sat Oct 21 02:28:25 PDT 2000



>I tried both the FFT method and the slow way directly from the equation and
>couldn't reproduce the results
>from the original code.  This leads me to believe that the forward
>MDCT used in the encoding is not the same as in the document.
>
>What am I doing wrong?

If you actually read the comments in mdct.c, you'll see that the algorithm
given in that paper has a number of typos in it (corrected in vorbis), and
that the vorbis code is further optimised, so it doesn't directly
correspond to what is found in the paper.

Michael

--- >8 ----
List archives:  http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body.  No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.



More information about the Vorbis-dev mailing list