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ice00
Registered: Apr 2002
Posts: 54 |
Digiorganizer noise question
I'm trying to use Digiorganizer for adding 4° channel of sample to a normal 3 channels tune.
I sample my own sound at 16 bit stereo 44KHz, then converted into 8 bit mono and downsample at 6KHz and finally made in standard 4bits format.
The resulting sample sound very good, but when I add the 3 channels sid music, a high noise sound appears and all sounds not good.
I did not use filter as this is recommended in the guide, so I'm wondering what is madding this (maybe hardrestart?).
If I use the demo 3 channel music that comes with digiorganizer with my sample I did not heard this terrible noise.
Can this be depending by the used music engine? (demo music is probably made in Voicetracker, I'm trying with Goatracker but I will go to try with Cybertracker).
Should I have to made some filtering to the sample before converting into 4 bit sample? |
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CyberBrain
Administrator
Posts: 392 |
(Cybertracker is probably not a good idea to go with samples yet, coz it isn't finished :) Yep, i know... i'm a lazy alcoholic bum) |
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ice00
Registered: Apr 2002
Posts: 54 |
I have put two recorded wave file here:
http://digilander.iol.it/ice00/download/sample.zip
maybe it should be more clear to understand what kind of noise I'm describing.
One wav sound only the sample, the other the sample + 1 sid voices.
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Dane
Account closed
Registered: May 2002
Posts: 421 |
If the music player for the sid-voices is setting d418, that should give you some funky noise. |
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ice00
Registered: Apr 2002
Posts: 54 |
Yes, NOP-ping the STA D418 (always performed at each IRQ even if filter not used) instruction used in goatracker has resolve the problem :) |
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cadaver
Registered: Feb 2002
Posts: 1154 |
Blame those who wanted fadeout support :) |
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TDJ
Registered: Dec 2001
Posts: 1879 |
Quote: Blame those who wanted fadeout support :)
Blame it on the boogie. |
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ice00
Registered: Apr 2002
Posts: 54 |
Quote: Blame those who wanted fadeout support :)
No, not me |-)
However with Digi-organizer now I see less interest (by me) in adding Digi support into Goattracker :) |
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cadaver
Registered: Feb 2002
Posts: 1154 |
Just out of curiosity, does Digi-organizer have some hook/shadowing method to let the musicroutine control filtering (upper bits of $d418) or does the digiroutine always take full control of that register? |
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ice00
Registered: Apr 2002
Posts: 54 |
Quote: Just out of curiosity, does Digi-organizer have some hook/shadowing method to let the musicroutine control filtering (upper bits of $d418) or does the digiroutine always take full control of that register?
Guide say to not use filter for best result, but not to not use, maybe it is possible. However I will try this tomorrow because I need filter in two channels in my music (actually the sound is not so good without filter).
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ice00
Registered: Apr 2002
Posts: 54 |
Looking at the player:
LDA $A586
LSR A
LSR A
LSR A
LSR A
ORA #$10
STA $D418
...
LDA $A585
AND #$0F
ORA #$10
STA $D418
It sets always a low pass filter during NMI (why?), but not other filter parameters are changed.
I think that with a little patch filter can be used. |
