Sound switching

The audio switching means the switching of the sound between two movie projectors at the end of a roll of film ( "Aktrolle") and the beginning of the next, ie at the time of in the projection of a movie transition .

With the usual optical sound film, the sound is switched by switching the sound lamp of the optical sound device on or off in order to ensure that only the sound track belonging to the current image is played. Additionally with is Dolby - processors the input switched optical preamp. In the case of magnetic sound films, the sound is switched by relays in the amplifier. The input of the Dolby processor is also switched with Dolby Digital .