[EMAIL PROTECTED] wrote:
>
> Rat rit:
>
> > You make the assumption that the ATRAC ASIC in your R55
> > is doing math the
> > same way your PIII does math, which is not the case. For
> > its one task, the
> > R55 is more powerful than your PIII.
>
> Rick was not assuming, he was asserting, that the ASIC contains a DSP core
> to execute the ATRAC algorithm. And I further assert (and I know because I
> have done it) that an FFT is performed on a DSP in a similar (but not
> identical) way to how it would be done on a Pentiuk. DSPs have special
> custom instructions to multiply and add in one operation, parallel
> instructions, zero overhead branching and RAM running at the CPU clock,
> which make them faster than general purpose CPUs at the same clock rate, but
> all these together don't amount to more than 5 times faster. My totally
> unsubstantiated guess is the R55's clock will be ~45 MHz (based on reading a
> number off a chip on an MZR35's circuit board).
Add to that the fact that most DSP cores I've seen, can do a load or store in
one cycle. Some of them can load a value, do a calculation on it and write it
back to memory. These things aren't (yet) possible on Pentiums.
Cheers,
Ralph
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Ralph Smeets Functional Verification Centre Of Competence - CMG
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