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 Post subject: Overtone 32
PostPosted: Sun Sep 13, 2015 7:20 pm 
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Joined: Sun Sep 19, 2004 11:12 pm
Posts: 19236
Location: NE Indiana, USA (NTSC)
What makes the NES triangle wave distinctive is its stepwise nature, which creates 31st and 33rd harmonics. For example, the lowest note the triangle wave channel can play is also the lowest A on an 88-key piano, or 27.5 Hz. But because of its 16-level, 32-step, sample-and-hold waveform (FEDCBA98765432100123456789ABCDEF), there are prominent harmonics at 852.5 Hz and 907.5. This creates a net effect of a pitch 32 times the fundamental frequency, and log[2](32) = 5, this sounds five octaves up.

The following piece was composed in FamiTracker and is best heard through dinky little laptop speakers that filter out the triangle's fundamental.


Attachments:
File comment: Play this on your PowerPak
overtone 32.nsf [6.14 KiB]
Downloaded 112 times
File comment: Vorbis encoded FamiTracker export
overtone 32.ogg [324.26 KiB]
Downloaded 114 times
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 Post subject: Re: Overtone 32
PostPosted: Sun Sep 13, 2015 11:32 pm 
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Joined: Sun Jan 22, 2012 12:03 pm
Posts: 5824
Location: Canada
Neat.


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 Post subject: Re: Overtone 32
PostPosted: Tue Sep 22, 2015 7:25 pm 
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Joined: Wed Apr 14, 2010 12:25 pm
Posts: 34
That's a nice idea!

With a tiny dpcm sample for another high octave c scale, you could prolly make some quiet 4-tone chords. Like, shifting pulse/pcm triads quietly over a sustained bass/high note drone as a song intro or segue.


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