Abstract: An electronic system is disclosed that is particularly useful for synchronizing motion picture and sound recordings. The system includes a sensor that is positioned contiguous to a movie camera during filming and contiguous to a movie projector during film playback to sense a characteristic indicative of film movement and, responsive thereto, producing an electrical output signal. During filming, a sensor, such as a microphone or induction coil, may be positioned contiguous to the movie camera such as by placing the sensor in a cylinder screwed into a camera tripod socket. During playback, the sensor, such as a light sensor, may be positioned to sense light bursts of a running movie projector. A control unit receives the electrical output signal from the sensor and utilizes the same in controlling operation of an associated tape recorder.