At 10:50 PM 2/2/99 +0100, you wrote:
>By the way, I also really like the SCC chip.
>It can have an incredibly full sound (only 5 channels) and is very fast.
I'm working on SCC emulation for the MoonSound.
Right now, it works only for SCC Musixx files, but I hope to add it to a
certain Konami game later.
A problem I'm having is that the technical limitations of the SCC seem to
give it its characteristic sound. By "technical limitations" I mean the
fact that SCC has very abrupt level changes (square-formed, no
interpolation) and that it produces a lot of noise.
At the moment, the MoonSound SCC emulation sounds too "rounded", in
contrast to the "raw" SCC sound. Especially for the strings, the sound is
not as SCC-like as I want it to be. However, the bass is a lot better when
emulated.
By the way, did you know that the formula for SCC frequencies is like this:
sccfreq = (msxfreq / 32) / (sccfnum + 1), where:
sccfreq is the played frequency (in Hertz)
msxfreq is the MSX clock frequency (3579545 Hz)
sccfnum is the value you poke in the SCC memory area
None of the info I had (including the info I put on my web page) mentioned
the "+1"...
But when I was sampling the SCC's output to see why the emulation didn't
sound right, I noticed the frequency that was played was different from the
one I expected. In fact, it was equal to the frequency of the neighbouring
fnum.
Bye,
Maarten
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