Control system for audio-visual projector

Details Control system for audio-visual projector Control system for audio-visual projector

G - Physics

11

B

88/63

G11B 31/00 (2006.01)

Patent

CA 1173679

CONTROL SYSTEM FOR AUDIO-VISUAL PROJECTOR Abstract A system for the control and synchronization of mag- netic tape and filmstrip in an audio-visual projector. Film is advanced by means of recorded advance tones on the magnetic tape which are detected by a tone detector to generate an advance pulse. An advance counter is incremented responsive to each advance pulse and decremented as the film advances each frame. The output of the advance counter actuates a film-advance mech- anism unless the contents of the counter are zero, so that syn- chronization is maintained even if the rate at which the advance pulses occur exceeds the operating speed of the film-advance mechanism. Means are provided to automatically synchronize the tape and film at predetermined locations by optically sensing markers affixed to the tape and film. The system may also advance the tape independently of the film in either a fast- forward or a regular-speed mode or it may advance the film independently of the tape.

394088

Affiliated with

Also associated with

Rating

Control system for audio-visual projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Control system for audio-visual projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for audio-visual projector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1310983