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Forums > C64 Composing > Sample-playing thru pitch register?
2008-02-21 13:30
McMeatLoaf

Registered: Jan 2005
Posts: 105
Sample-playing thru pitch register?

Here's another of my unwanted, unnecessary questions...
Is there a way to play samples through the pitch register by inputting the sample value into the register?
I haven't really seen any attempt on this, so I don't know if is possible, but it would surely give some advantage of the 16-bit freq resolution...

/McLoaf
2008-02-21 15:01
HCL

Registered: Feb 2003
Posts: 716
Well, you just take your haxx0r data, shove it in there and see what happens..
2008-02-21 16:01
Mace

Registered: May 2002
Posts: 1799
From what I've heard, this is possible.
However, you can't just poke all data to one register in the wanted sample frequency.
There is a certain 'lag' which makes it necessary to alternate between at least 2 registers.

And then what HCL said: try before we die (so we know)!
2008-02-21 16:20
Jammer

Registered: Nov 2002
Posts: 1289
to my logic it cannot really give any effects. raw samples are stored as a sequence of volume levels where the middle of the range is sample's zero level. frequency of audible sound depends on how fast the wave oscilates, right? conclusions are yours ;)
2008-02-21 16:54
chatGPZ

Registered: Dec 2001
Posts: 11119
it could work by doing a FFT as a preprocessing stage. ie apply a filterbank with several thousend bands, then use the most dominating frequency each "tick" and write it into the sid regs. (or, even the most dominating 3 frequencies).

worth a try. maybe. =)
2008-02-21 18:21
McMeatLoaf

Registered: Jan 2005
Posts: 105
I was essentially thinking of creating sample playback via FM, but I guess it isn't possible, plus, my knowledge is very limited...
Would it be easier with just 8-bit?
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