ChanServ changed the topic of ##yamahasynths to: Channel dedicated to questions and discussion of Yamaha FM Synthesizer internals and corresponding REing. Discussion of synthesis methods similar to the Yamaha line of chips, Sound Blasters + clones, PCM chips like RF5C68, and CD theory of operation are also on-topic. Channel logs: https://freenode.irclog.whitequark.org/~h~yamahasynths
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<Lord_Nightmare> TIL there's actually a surprising number of games which use adpcm_a samples which cause the accumulator to overflow
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<cr1901_modern> Even one channel is trivial if you use "Amplitude Modulation" algorithm on OPL, and "Algorithm 7" on OPM/N
<cr1901_modern> MicroHex's would be a challenge tho
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<cr1901_modern> >What you actually hear are the two original tones at 770 and 1336 Hz, as well as the sum (2106 Hz) and the difference (556 Hz) frequencies. http://www.rfcafe.com/references/electrical/dtmf.htm
<cr1901_modern> Err, last I checked, sending the sum of two sine waves doesn't generate sum and difference frequencies.
<cr1901_modern> (although modulating 770 Hz w/ a 1336 Hz carrier would)
<cr1901_modern> Does DTMF also send an AM tone?
<Ultrasauce> the oscillator and other amplifiers downstream are not linear
<Ultrasauce> so the superposition principle does not hold
<cr1901_modern> still curious how you'd get sum and difference frequencies from a nonlinear amplifier
<cr1901_modern> tyvm
<Ultrasauce> wish i could explain it succinctly myself but not quite there yet
<cr1901_modern> frequency effects of nonlinearity were kinda handwaved away in Uni. I knew a bit about having a sinusoid of f_1 in and getting a sinusoid of f_2 out (different frequency).
<cr1901_modern> But this type of nonlinearity seems to be "f_1 in, f_1, f_2, f_3,... f_n out"
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<Stilett0> Sarayan / Lord_Nightmare: was digging around in old MAMEdev blogs tonight and I stumbled upon Jarek Burczynski's old website:
<nonlinear> Maybe also handwaving, but simply, any nonlinearity acts as a mixer, so the nonlinear amplifier will mix the two frequencies generating f1 + f2 and f1 - f2.
<Ultrasauce> the man himself
<nonlinear> Yes, I am summoned whenever there are nonlinearities involved :)
<cr1901_modern> oh whoops :P
<cr1901_modern> whitequark: Indeed, DMTF is used to send data to production quality machines. Wonder if the format is standardized.
<cr1901_modern> I'm more curious as to the purpose of the color bar tone
<cr1901_modern> DTMF*
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<superctr> a bit late
<superctr> <l_oliveira> that's system 32 <- I have a picture of a system 32 PCB with RF5C105 chip
<superctr> not Sega marked
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<protosphere> I found one of those FM chip gachas in akiba
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<cr1901_modern> protosphere: I thought there was only one FM chip gacha
<cr1901_modern> it's a marketing stunt for a specific store AIUI
<TD-Linux> there is, it's kenchan's store
<protosphere> That’s the one
<protosphere> They had those USB FM board kits there too, but kind of expensive (¥15800 iirc)
<futarisIRCcloud> http://kadenken.com ?
<protosphere> mm
<cr1901_modern> protosphere: Anyways, did you get anything good from that gacha?
<cr1901_modern> (I assume the temptation of seeing said gacha is too great not to play)
<protosphere> I got an OPN yes
<protosphere> I was hoping for an OPM or OPNA
<cr1901_modern> OPN{2, A, B, WTF, BBQ}
<protosphere> OPN2
<protosphere> 2203
<protosphere> I think that’s right
<cr1901_modern> Oh I was just being silly
<cr1901_modern> Because I'm a fake fan I don't actually know how the parts number match up
<protosphere> It has the date code scratched off though
<cr1901_modern> OPM/2151 is still pretty cheap on ebay afaik
<protosphere> Yeah but gacha is more fun
<cr1901_modern> I bought 3 in 2015, knowing I would lose one eventually. Spoiler alert: I lost one for 8 months. Found it within the past 2 months.
<cr1901_modern> Someone who is on IRC gave me a bunch of YM2610s that I've never used b/c I can't be arsed to create a breadboard adapter for it
<cr1901_modern> protosphere: Pedantry warning: Just looked it up... YM2612 is OPN2 (the one FM synth everyone cares about); YM2203 is OPN
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<superctr> Buying sound chips from china (utsource or ebay) is like gacha too
<superctr> 50% chance you get a fake
<l_oliveira> gacha, indeed exactly how it is
<l_oliveira> I got four YM2608s from utsource all were legit
<l_oliveira> (as in not sanded/tampered with)
<l_oliveira> but one were faulty. I had it fixed applying "love" to it (I smacked it up with the screwdriver handle while it was running)
<l_oliveira> supposedly a bonding wire were loose
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<Lord_Nightmare> cr1901_modern: you found the 2151 dev board that got lost?
<MicroHex> a heck of an "audio card" https://twitter.com/Foone/status/1114195866452209664
<MicroHex> with bonus features
<Foone> heh. I just pulled up IRC to post that here
<Foone> glad to see you're on top of things :)
<Wohali> :D
<Wohali> hi foone.
<l_oliveira> https://drive.google.com/open?id=11EDqFgJ5wBUxIBnhe5QtMkx8M5gbBLsG comparing YM2151+AY-3-8910 to YM3438+SN76489 on realtime software translation with a vgmplayer
<l_oliveira> it's a audacity project with the two waves aligned
<Foone> Wohali: hallo!
<l_oliveira> music is 1st stage from Genesis/MD Castlevania
<Wohali> :)
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<cr1901_modern> Lord_Nightmare: It was a breadboard w/ a 2151 on it, but yes I found it. Fell behind a shelf
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