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MagPi54
MagPi54
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ADDITIVE SYNTHESIS<br />
Tutorial<br />
Language<br />
>RUBY<br />
Left Combine<br />
sounds to make<br />
new ones with<br />
additive synthesis<br />
Amplitude shaping<br />
nother wy in whih we n finey rt our ound i<br />
to ue dierent enveope nd option or eh ynth<br />
trigger. or empe thi wi ow you to me ome<br />
pet o the ound peruive nd other pet ring<br />
out or period o time.<br />
oupe o ow ine wve to give the ound ome <br />
nd depth. iny we ue define to wrp our ode in <br />
untion whih we n then ue to py meody. ry<br />
pying your own meody nd o meing round with<br />
the ontent o the :bell untion unti you rete<br />
your own ry ound to py with<br />
detune = 0.1<br />
synth :square, note: :e1, release: 2<br />
synth :square, note: :e1 + detune, amp: 2,<br />
release: 2<br />
synth :gnoise, release: 2, amp: 1, cutoff: 60<br />
synth :gnoise, release: 0.5, amp: 1, cutoff: 100<br />
synth :noise, release: 0.2, amp: 1, cutoff: 90<br />
n the empe ove we hve mied in noiy<br />
peruive eement to the ound ong with ome<br />
more peritent ground ruming. hi w<br />
hieved firty y uing two noie ynth with<br />
midding cutoff vue 90 nd 100 uing hort<br />
release time ong with noie with onger release<br />
time ut with ow cutoff vue whih me the<br />
noie e rip nd more rumy.<br />
Bringing it all together<br />
et omine thee tehniue to ee i we n<br />
ue dditive ynthei to rerete i e ound.<br />
eve roen thi empe into our etion. irty<br />
we hve the hit etion whih i the initi onet<br />
prt o the e ound nd o ue hort enveope<br />
e.g. release: o round 0.1. et we hve the<br />
ong ringing etion or whih were uing the pure<br />
ound o the ine wve. otie tht were oten<br />
inreing the note y roughy 12 nd 24 whih i the<br />
numer o note in n otve. eve o thrown in <br />
define :bell do |n|<br />
# Triangle waves for the ‘hit’<br />
synth :tri, note: n - 12, release: 0.1<br />
synth :tri, note: n + 0.1, release: 0.1<br />
synth :tri, note: n - 0.1, release: 0.1<br />
synth :tri, note: n, release: 0.2<br />
# Sine waves for the ‘ringing’<br />
synth :sine, note: n + 24, release: 2<br />
synth :sine, note: n + 24.1, release: 2<br />
synth :sine, note: n + 24.2, release: 0.5<br />
synth :sine, note: n + 11.8, release: 2<br />
synth :sine, note: n, release: 2<br />
# Low sine waves for the bass<br />
synth :sine, note: n - 11.8, release: 2<br />
synth :sine, note: n - 12, release: 2<br />
end<br />
# Play a melody with our new bell!<br />
bell :e3<br />
sleep 1<br />
bell :c2<br />
sleep 1<br />
bell :d3<br />
sleep 1<br />
bell :g2<br />
raspberrypi.org/magpi February 2017<br />
61
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