Room Tone
Definition
A recording of the ambient sound of a specific location with no dialogue or intentional sound, capturing only the natural acoustic character of the space — HVAC systems, distant traffic, electrical hum, the unique acoustic signature of the room. Used in post-production to fill gaps and maintain sonic continuity.
In Simple Terms
The sound of silence in a specific room — except it's never truly silent. Every room has its own unique background sound. Recording 30 seconds of "silence" on location gives editors the material to patch over gaps and keep scenes sounding consistent.
In Practice
Before wrapping a location shoot, the sound recordist asks the set to remain silent and records 60 seconds of room tone. In post-production, this room tone is used to fill the gaps between dialogue edits, preventing unnatural jumps between sound and digital silence.