You can use NamLing's algorithm for that instead og 512 mul for each iteration
it will take 256 + 32 mul, i am not able to figure out how to implement
recursive formulla.
The Namling's paper is available at
"Two polyphase filter architecture for MPEG audio",Namling,Shih, IEEE trans.
speech and audio processing
and another useful paper for this is
"Fast implementation of MPEG audio coder using recursive formula with fast
DCT", Cahn, YAng, Fang IEEE trans. speech and audio process
rgds
soyeb
Segher Boessenkool wrote:
>
> > i mean in terms of speed like using faster algo like Lee's IDCT for faster
> > implementation.
> > rgds
> > soyeb
>
> Ok. Yes, been there, done that. The 32 point dct II, as well as the 18 point
> dct IV. Both with a Lee -like algorithm. Works like a charm :-)
> The slowest part is the polyphase windowing, and I haven't found a way to
> speed it up.
>
> Ciao,
>
> Segher
>
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