Simple Explanation

Any unwanted sound or signal that isn't part of the original audio.

Concise Technical Definition

Unwanted electrical or acoustic signals that interfere with or obscure the desired audio signal; may be internally generated or externally introduced.

Layman-Friendly Analogy

Like static on a radio or a hum in your speakers—something you didn’t ask for, but you hear anyway.

Industry Usage Summary

In audio, noise can include hiss, hum, buzz, or random static introduced by gear, cables, power sources, or environmental interference. Designers work to minimize noise and improve signal-to-noise ratio (SNR).

Engineering Shortcut

Any signal not intentionally part of the desired audio; measured via SNR.

Full Technical Explanation

In audio, noise refers to any unintended or undesirable sound or electrical signal that contaminates the desired signal. It may originate externally (e.g., electromagnetic interference, ground loops, room reflections) or be generated internally by components (e.g., resistor thermal noise, transistor hiss, power supply hum). Types of noise include white noise, pink noise, hum (50/60 Hz), buzz, and hiss. The degree to which noise intrudes upon the intended signal is quantified by the signal-to-noise ratio (SNR). High-fidelity systems strive for a high SNR to ensure clarity and accuracy. In physics and engineering, noise is also defined as a random, persistent disturbance that reduces a system’s fidelity or precision. The term extends into computing and data analysis as irrelevant or meaningless information.