Distortion
Definition
Any alteration of an audio signal that adds harmonic content not present in the original. Can be unintentional (clipping, equipment failure) or intentional (saturation, overdrive, harmonic enhancement).
In Simple Terms
Any change to a sound that adds new frequencies not in the original. Sometimes it's bad (clipping), sometimes it's intentional and sounds great (tube warmth, guitar overdrive). Context is everything.
In Practice
A guitar amplifier driven into harmonic distortion produces the saturated tone characteristic of rock — the amp's output stage is intentionally pushed beyond linear operation to generate musical even-order and odd-order harmonics. The same circuit fed a bass guitar produces a different harmonic profile, which is why bass amps and guitar amps sound distinct even when driven identically.
Common Confusion
Distortion and saturation are different points on the same harmonic spectrum, not different effects. Saturation is gentle harmonic enrichment perceived as warmth; distortion is aggressive harmonic addition perceived as character or destruction. The boundary is taste, not technical specification.
Sources & Verification
- Pakarinen, J. & Yeh, D. T. — A Review of Digital Techniques for Modeling Vacuum-Tube Guitar AmplifiersComputer Music Journal, 2009
- Yeh, D. T. — Digital Implementation of Musical Distortion Circuits by Analysis and SimulationStanford CCRMA PhD Thesis, 2009
Last verified: 2026-05-05