Anti-sound
Anti-sound is a sound wave used to cancel or nullify other sounds.
Fiction
G1 cartoon continuity
The citizens of Eurythma used anti-sound to cancel out the destructive melody stolen from them by Soundwave. Carnage in C-Minor
Trivia
In the real world, anti-sound devices (called active noise control speakers) are used in areas where undesirable sounds originate (such as traffic). The concept was introduced in Arthur C. Clarke's 1957 short story "Silence Please". Clarke intended it as a humorously improbable device — with dire consequences for the inventor.
External links
Active noise control at Wikipedia
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