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PostPosted: Tue Jun 12, 2018 1:26 pm 
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Are these samples explicitly open-source / free to use?

I am working on a music related NES project, and I might be able to use these as a pseudo 2nd triangle channel.

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PostPosted: Tue Jun 12, 2018 1:31 pm 
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dougeff wrote:
Are these samples explicitly open-source / free to use?

lidnariq provided the script that generated them, so yes they're open source: http://forums.nesdev.com/viewtopic.php?p=154032#p154032

I don't think any license was explicitly stated but I suspect that it's not really possible to copyright a triangle wave anyway?

One thing you might try to take into account if trying to build a more practical version is that the samples have a volume that is kind of determined by the divisor of its sample period, so the volumes are very mismatched between different samples. (The timbre varies too.)


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PostPosted: Tue Jun 12, 2018 2:35 pm 
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1- I think they probably count as "math", so not copyrightable
2- If they are, I'm certain there's prior art to my instance
3- as far as I am concerned, they're public domain / CC-0 / WTFPL as you wish.


Different timbre? Oh, right, there's
A- weirdness with odd divisors (because ÷3 when quantized has to be 001101), but this gets more and more subtle the larger the divisor.
B- the stairstep harmonics because it's DPCM: The ÷2 case is necessarily just a square wave, and the larger the divider the subtler the distortion and louder the triangle wave.
C- clipping with divisors larger than ÷62

edit:
rainwarrior wrote:
Well, lidnariq's goal was to provide every possible usable sample that evenly divides the available sample lengths.
Where I chose "usable" to mean "within 7 cents of A440 12-TET". Some of the other divisors (e.g. ÷7, ÷11) just don't fit into 12-TET, but might fit into 17-, 19-, or 24-TET...

.. has anyone written chiptune music that uses these microtonal temperaments? I guess I just found Sevish, who's done a bunch of random things, including 10-TET FM and 13-TET PSG...


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