From the original SynthMaker forum (2004–2014), with its members’ names and dates.
djbrynte ·
just wondering how to make that ring mod. I tested doing ring mod and fails all time. Need help in this part.
Images OSM everything is welcome.
I know you should connect osc 3-2-1 its for 3 osc btw.
Stream togheter. Im trying to make it such as you use amp to get higher ring mod. I can do it with on off.
I send an little OMS here with FM and Ring mod by XO.
Question is how do i make it for 3 osc with volume knob?/AMP
loopeytunes ·
correct me if i'm wrong but you need to multiply a simple waveform (sine) with another. Multiply both signals to get RM.
Loopey
loopeytunes ·
I'm not sure but try add them both together and then multiply them by 2??
RunBeerRun2 ·
That example looked weird, the ring mod osc is pitched w/the midi to poly. It should be a fixed pitch, otherwise you're multiplying 2 oscillators.
djbrynte ·
thnx guys
trogluddite ·
RunBeerRun2 wrote: otherwise you're multiplying 2 oscillators
That is still ring modulation - it doesn't have to be a fixed frequency.
Neptune ·
What is your proposal for RM in SM ? Should the modulator be bipolar or unipolar?
http://en.wikibooks.org/wiki/Sound_Synthesis_Theory/Modulation_Synthesis
RunBeerRun2 ·
Cool info Trog, as a guitar player I've never really put any more thought into it other than what Guitar Center can sell me as a pedal.
trogluddite ·
Neptune wrote: Should the modulator be bipolar or unipolar?
My understanding has always been that... Unipolar = Amplitude modulation. Bipolar = Ring modulation. But the distinction is kind of historical - multiplication of waveforms is much easier than it used to be...
The name 'ring modulator' is nothing to do with the sound it generates, but is a description of the circuit used when making analogue electronic ring modulators. With real circuits, controlling the amplitude of a signal is very easy with a VCA circuit - but that only lets you control the amplitude; if the modulator goes negative, most circuits would just stick at zero (kind of like a rectifier). The ring modulator uses transformers connected in a loop "the ring", to create a circuit that can multiply two voltages regardless of their sign. So traditionally, a ring modulator was the one to use if your modulator was bipolar.
In DSP,, multipliers just multiply, there's no limitation about what is positive or negative - though you will certainly get a slightly different sound with unipolar/bipolar modulators. In most synths though, a ring modulator is part of the architecture of the synth rather than a 'guitar pedal' style add-on effect. In this context, RM usually means ring modulating one oscillator with another - so both signals would naturally be bipolar anyway - though there's no reason you couldn't have the option of a fixed oscillator (or variable keyboard tracking).
PS) Depending what your source and modulator signals are, you can generate some big DC offsets with a ring modulator (in-phase waveforms tend to generate only +ve numbers, 180deg out-of-phase mostly negative) - so it's often worth adding a DC offset remover.after the RM so that the output stays 'balanced'.
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