Ring Modulation

What Is Ring Modulation?

Ring modulation is a type of amplitude modulation that multiplies two signals together – usually two audio-rate waveforms. It creates a new sound by producing the sum and difference of the input frequencies, while suppressing the original signals.

The result is often inharmonic, metallic, and alien – especially when the input signals aren’t musically related. It’s a classic tool for robot voices, bells, and weird sci-fi textures.

How It Works

  • Carrier: One of the input signals, often a steady waveform (like a sine or triangle).
  • Modulator: The other input – this modulates the amplitude of the carrier at audio rate.
  • Output: Contains the sum and difference of the frequencies, not the originals.

Why Use It?

  • Inharmonic Timbres: Create non-musical metallic or bell-like tones.
  • Voice Processing: Classic “robot voice” when modulating a vocal signal.
  • Sound Design: Great for abstract, dissonant textures or eerie drones.

Tips for Patching

  • Use two oscillators with different waveforms – try a sine + saw combo.
  • Modulate one of the frequencies for evolving tones.
  • Try using an LFO as a modulator to slowly tremble or pulse the carrier.

Ring modulation is one of those “happy accident” tools. Sometimes it sounds unplayable, sometimes it’s exactly the texture you didn’t know you needed. Dial in, detune, and embrace the clang.

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