double-system recording

Double-system recording is a cinematic process where sound is recorded separately from the video footage. This method offers greater flexibility in post-production compared to single-system recording, where sound and image are captured by the same camera.1

In double-system shooting, a clapperboard or digital slate is used to synchronize the separate audio and video tracks. Precise speed control for both the camera and recorder is crucial to maintain synchronism, often achieved through a common power supply, sync-pulse signals, or crystal sync technology.1

While most sound for films is now adjusted and added during post-production, the final combination of dialogue, music, and sound effects is known as mixing or rerecording. This process allows for detailed manipulation of sound quality and loudness to create the desired dramatic balance.2