What does Clapperboard mean?
Clapperboard is the hinged board used on film and television sets to mark the beginning of each take and synchronize audio with video in post-production. The clapperboard displays the production name, scene number, take number, director, and camera operator. When the clapper arm is snapped shut, the sharp visual and audio marker gives editors a precise sync point to align the picture and sound tracks. Clapperboards are operated by the Second Assistant Camera (2nd AC). Note: on set, a clapperboard is often called a “slate” — but this is completely unrelated to the Slate an actor gives at the start of an audition.
Example:The 2nd AC held the clapperboard in front of the camera, called out “Scene 12, Take 3,” and snapped the clapper shut — giving the editor a clear sync point to match the audio recorded on the boom to the camera footage.
Example:During a multi-camera shoot, a separate clapperboard was used for each camera at the start of each take, ensuring all footage could be precisely synced during the edit regardless of which angle the editor chose to use.
Did You Know?
In the early days of filmmaking, picture and sound were recorded on separate devices with no automatic synchronization. The clapperboard solved this problem elegantly — the sharp “clap” creates an unmistakable spike on the audio waveform that editors can align precisely with the frame where the clapper closes. Digital filmmaking has made sync easier, but the clapperboard remains standard on professional sets worldwide.
