AM/FM Modulation
Create tremolo, vibrato, and warble effects with amplitude and frequency modulation
Try Modulation
440 Hz carrier with 5 Hz AM tremolo
What is Modulation?
Modulation varies one property of a sound wave using another wave. The main tone is called the carrier, and the wave that changes it is called the modulator.
- AM (Amplitude Modulation): Changes the volume of the carrier wave, creating tremolo effects
- FM (Frequency Modulation): Changes the pitch of the carrier wave, creating vibrato and warble effects
Modulation Controls
The modulation panel provides control over both the carrier and modulator:
- Modulation Type: Choose AM (tremolo) or FM (vibrato/warble)
- Carrier Frequency: The main tone frequency (20-20000 Hz)
- Modulator Rate: How fast the modulation occurs (0.1-100 Hz)
- Modulation Depth: How much the modulation affects the sound (0-100%)
- Waveforms: Select waveforms for both carrier and modulator
Amplitude Modulation (Tremolo)
AM varies the volume of the carrier wave. At slow rates (1-5 Hz), this creates a tremolo effect. At faster rates, it creates more complex timbres.
| Modulation Rate | Effect | Example |
|---|---|---|
| 1 – 5 Hz | Gentle tremolo | Classic guitar tremolo |
| 5 – 20 Hz | Warble tone | Emergency sirens |
| 20 – 100 Hz | Ring modulation | Robot voices, bell-like tones |
Frequency Modulation (Vibrato)
FM varies the pitch of the carrier wave. At slow rates with low depth, this creates vibrato. Higher depths create more dramatic pitch sweeps.
Vibrato Tip: For natural-sounding vibrato, use 5-7 Hz rate with 10-20% depth.
Applications
URL Parameters
Share modulation settings via URL:
- gmode=modulation — Activates modulation mode
- mtype — Modulation type (am or fm)
- mcarr — Carrier frequency in Hz
- mmod — Modulator rate in Hz
- mdepth — Modulation depth (0-100)
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