A clap board is an instrument which is generally used in both video tape and motion picture production for helping in the picture and sound synchronization.
It also helps in designation and marking specific takes and scenes recorded through the production.
The loud noise of clap which this tool creates can be recognized effortlessly on the track of audio.
The fastening of the clap stick also can be recognized effortlessly on detached visual track.
By matching the movement and loud noise you can synchronize the two tracks exactly.
This device is the combination of chalkboard slate and clap stick.
The slate holds all the information which recognizing the next scene.
The stick is used for align picture and sound.
Earlier in the film production one person was holding the slate in front of the camera with the information of scene, and another person was clapping two separated sticks together facing the camera.
Today the combination of two things in one unit helps one person to handle both the jobs very easily.
This device is used by containing the information of next take or scene which is written on the slate.
This information typically includes such things like the title of production, scene number, take number, slate number, camera angle, the date, director's name, director of photography's name and other scene information.
The person who is holding this instrument is known as the clapper loader.
Generally he is the person who is responsible for the operation and maintenance of this instrument.
It is very useful and helpful during the editing period.