Multiple film type motion picture projection

In a motion picture projector constructed for different operating conditions corresponding to different types of film, the projector including different sound pickup systems, such films having a leader portion provided with machine readible markings which characterize the particular type of film, the combination comprising:

• a carriage disposed for movement transversely to the film;
• pickup means on the carriage for reading the markings on said leader portion and generating pulses in response thereto, the carriage having a position so that the pickup means is disposed above the center of the film;
• circuit means including logic decoding means coupled to said pickup means for receiving therefrom said pulses and providing control signals representative of the type of film as identified by the markings;
• and
• control means coupled to said circuit means and operable by said signals for switching predetermined operating conditions in the projector including selection of frame rate of reproduction selection of a sound reproducing system in the projector and shifting the carriage so that the pickup means becomes disposed above a sound track of the film.