Sound synchronizing system

Abstract

Abstract MOTION PICTURE FILM AND MAGNETIC SOUND TAPE ARE SYNCHRONIZED BY PROVIDING ON THE TAPE SYNCHRONIZING SIGNALS OF A FORM THAT CAN BE SENSED WITH THE TAPE STATIONARY AND BY SENSING SUCH SIGNALS IN MULTIPHASE. THE CAMERA OR PROJECTOR IS DRIVEN BY MULTIPHASE CURRENT DERIVED FROM THE RESPECTIVE SIGNAL COMPONENTS, USINGS A STEPSYNCHRONOUS MOTOR. THE TAPE CAN THEN BE DRIVEN WITHOUT COMPRISING THE SOUND QUALITY, AND THE FILM MAINTAINS SYNC DURING STOP, START AND REVERSAL OF THE TAPE. THE SYNC SIGNAL OF STATIONARY READABLE FORM MAY COMPRISE A PUNCHED HOLE OR OTHER VISIBLE MARK FOR EACH PICTURE FRAME. SUCH MARKS ARE READABLE BY PHOTOSENSORS AND FACILITATE HAND SYNCHRONIZATION, ESPECIALLY DURING EDITING. THE STATIONARY READABLE SIGNAL MAY BE PRE-RECORDED ON THE TAPE ANE EMPLOYED TO DRIVE THE CAMERA DURING RECORDING AND TO DRIVE THE PROJECTOR DURING REPRODUCTION. OR, IF A CAMERA-GENERATED SYNC SIGNAL IS MAGNETICALLY RECORDED ON THE TAPE ALONG WITH THE SOUND, THAT SIGNAL CAN BE LATER SENSED MAGNETICALLY AND A STATIONARY READABLE SIGNAL APPLIED TO THE TAPE UNDER ITS CONTROL. SUCH CONVERSION PERMITS MANY TAPES RECORDED BY PREVIOUS PROCESSES TO BE REPRODUCED BY THE PRESENT METHOD.

Inventors

• 👤 Loren L Ryder

Bibliographic Details