Hi!
After long pause with cSound, I’m trying to remember the programming in it.
How to ring-modulate one file by another one in cSound?
Best regards,
Vadim
* Freemind <00000feca4c3aaff-dmarc-request@LISTSERV.HEANET.IE> [2024-01-29 09:19]:
Hi!
After long pause with cSound, I'm trying to remember the programming in it.
How to ring-modulate one file by another one in cSound?
Multiply their amplitudes. Ring modulation is actually amplitude
modulation.
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Hi Vadim,
Here’s an example (btw the correct spelling is Csound not cSound)
instr 1
p3 = min(filelen(p4), filelen(p5))
a1 diskin p4
a2 diskin p5
out a1*a2
endin
schedule(1, 0, 0, "fox.wav", "beats.wav")
HTH
Not to seem pedantic, but ring modulation is a form of amplitude modulation but not the same.
Amplitude modulation uses a unipolar signal to modulate the carrier and the carrier remains audible (carrier + sidebands). Ring modation uses a bipolar signal to modulate the carrier and only the sidebands are audible.
-odacsr = 48000
ksmps = 32
nchnls = 1
0dbfs = 1
instr AmpMod
aCarrier diskin “beats.wav”, 1, 0, 1
aModulator diskin “anditsall.wav”, 1, 0, 1
aSig = aCarrier * (aModulator/2 + .5)
out aSig
endin
schedule “AmpMod”, 0, 16
instr RingMod
aCarrier diskin “beats.wav”, 1, 0, 1
aModulator diskin “anditsall.wav”, 1, 0, 1
aSig = aCarrier * aModulator
out aSig
endin
schedule “RingMod”, 16, 16
Best,
Scott
Ok, that’s downright fluky - Victor & I must have posted seconds apart 
* ST Music <stunes6556@GMAIL.COM> [2024-01-29 10:52]:
Not to seem pedantic, but ring modulation is a form of amplitude modulation
but not the same.Amplitude modulation uses a unipolar signal to modulate the carrier and the
carrier remains audible carrier \+ sidebands. Ring modation uses a bipolar
signal to modulate the carrier and only the sidebands are audible.
Great, I didn't know this! Thank you!
P
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yes, and perhaps it is most easy to consider AM as a mix of RM and the carrier signal.
so in your example:
instr AmpMod
aCarrier diskin "beats.wav", 1, 0, 1
aModulator diskin "anditsall.wav", 1, 0, 1
aRM = aCarrier * aModulator
aAM = aRM + aCarrier
out aAM (or aAM/2)
endin
then we are free to weight like
aAM = aRM/2 + aCarrier
or
aAM = aRM + aCarrier/2
and we do not have to care about the modulator always staying above zero etc.
joachim