Device for storing electromagnetic control signals on magnetic strip material and a sound film projector equipped therewith

A device for the storage of electromagnetic control signals on at least one longitudinally extending section of magnetic strip material such as magnetic tape, motion picture film, and the like, the opposite ends of each section being defined by marker signals and arranged to be operatively associated with a magnetic head connected to recording and reproduction amplifying means comprising, in combination, means for advancing said strip materials selectively either in a forwards or backwards directions a control signal generator;

• a control unit connected to said control signal generator for activating said control signal generator;
• first switch means connected to said means for advancing to select said forward direction and connected to said control unit to activate said signal generator during the advance of the strip material in said forwards direction to store a control signal on the strip material;
• a first detector responsive to the marker signals on the strip material for deactuating said control unit and said signal generator when one of said marker signals is detected by said first detector through the magnetic head;
• second switch means connected to said means for advancing to select said backwards direction;
• and a second detector connected to said control unit and responsive to said control signal at least during the advance of the strip material in said backwards direction for causing said control unit upon detecting said control signal to activate said control signal generator to store said control signal on said section of the strip material whereby when said first detector detects a marker signal said control unit is deactuated and the entire section of strip material then contains said control signal.