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FamiTracker > General > FamiTracker Talk > PCM on a pulse channel Owner: za909 New post
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PCM on a pulse channel Posted: 2014-05-09 12:39  (Last Edited: 2014-05-09 12:41) Reply | Quote
za909

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#57071
So I read a lot about how sample playback works on the master system, and I thought about trying it on the NES. I hope this is possible on real hardware, assuming the code can run 133 times per frame to get a sampling rate of ~8000Hz like this hacked module.

Although the envelope sequence length is quite limiting I made a kick using a pulse channel, setting the period to 8 and using fast volume writes. Also you can apply 2-bit volume control via PWM thanks to the 4 duty settings.
I'm not sure if this high frequency would get filtered on hardware though.
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pulsepcm.ftm (3 Kb)
Posted: 2014-05-09 17:20 Reply | Quote
rainwarrior

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#57074
You can avoid the PWM slicing if you use a low frequency, reset the phase continually, and use duty 3 (which starts high, unlike the other duty settings). B00daW made a demonstration of this a while back actually, not with Famitracker though.
Posted: 2014-05-11 00:32 Reply | Quote
za909

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#57132
Oh so you can get a constant signal going...very sneaky.
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RE: PCM on a pulse channel Posted: 2014-05-11 00:38 Reply | Quote
jrlepage
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#57133
This might be of interest to you.
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pulsepcm1.nes (256 Kb)
Posted: 2014-05-11 00:49 Reply | Quote
CheeseGuy99

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#57134
Holy CRAP that's epic. It's certainly of interest to me xD

Posted: 2014-05-11 01:53  (Last Edited: 2014-05-11 02:03) Reply | Quote
VinylScratch

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#57136
WOW. That's all done at 60Hz? I am truly interested. If this goes far enough, we will be able to recreate music from the Amiga on the NES. [url=http://www.youtube.com/watch?v=Y6mXLxUZvzg]You already can on the Commodore 64 (With a few minor limitations)
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Posted: 2014-05-11 02:35 Reply | Quote
jrlepage
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#57137
I don't think any of this works at 60 Hz. :p
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Posted: 2014-05-11 10:41 Reply | Quote
za909

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#57148
Wow this is great quality for 4-bit sampling. I have to guess that there's a high sampling rate going on here. At least definitely more than just 8kHz.
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Posted: 2014-05-13 18:43 Reply | Quote
mmkthecoolest

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#57264
I just tried this on NTSC VirtuaNES...doesn't work so well with PAL, though.
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Posted: 2014-05-14 00:19 Reply | Quote
jrlepage
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#57317
It works just fine on an NTSC NES, that's the most important part I guess.

That reminds me, I haven't tried it on my PAL NES. Maybe I should try that sometime.
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Posted: 2014-05-14 04:48 Reply | Quote
rainwarrior

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#57325
It should run on PAL, just slower.
Posted: 2014-05-16 23:24 Reply | Quote
jrlepage
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#57442
Turns out it would just [url=https://www.youtube.com/watch?feature=player_detailpage&v=Ch_5_x1IUA8#t=88]play at the speed and pitch it was meant to play.
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