Projector for film with twin sound tracks - has trick device allowing sound mixing, with replay head generating control signals from transferred sound signals

摘要

The projector has a trick device to transfer sound from a first track onto a second track where it is combined with sound already recorded on the second track (ie. mixed). A replay head is assigned to the sound being transferred from one track to another and activates or controls the trick device during the transfer process. This replay head generates a control signal from the sound signals being transferred. At least when the sound signals being transferred appear, the trick device is actuated and the first recording on this sound track is switched to attenuated.