Browse Prior Art Database

Motion Picture Cueing System

IP.com Disclosure Number: IPCOM000090186D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Lazarchick, N: AUTHOR

Abstract

This motion picture cueing system is for detecting and decoding cue marks on motion picture film and using these decoded cues for controlling a motion picture projector. The light from bulbs 1 and 2, is projected through motion picture film 3 onto two photodetectors 4 and 5. Cue marks 6 are coded groups of linked markings between sprocket holes 7 of film 3. Cue marks 6 interrupt the light beams as film 3 travels at its normal rate of speed. Photodetectors 4 and 5 sense this modulated light and develop signals which are proportional to the amount of modulation. The detected signals are fed to comparators 10 and 11 where they are compared to some preset level so as to distinguish between sprocket hole modulation and cue code modulation.

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Motion Picture Cueing System

This motion picture cueing system is for detecting and decoding cue marks on motion picture film and using these decoded cues for controlling a motion picture projector. The light from bulbs 1 and 2, is projected through motion picture film 3 onto two photodetectors 4 and 5. Cue marks 6 are coded groups of linked markings between sprocket holes 7 of film 3. Cue marks 6 interrupt the light beams as film 3 travels at its normal rate of speed. Photodetectors 4 and 5 sense this modulated light and develop signals which are proportional to the amount of modulation. The detected signals are fed to comparators 10 and 11 where they are compared to some preset level so as to distinguish between sprocket hole modulation and cue code modulation. The output of such comparators provides digital pulses which are inputted into digital logic circuit 15. The latter selects the relay drivers and relays that are to be switched in response to the cue code specified on the film. The relay drive drivers drive relays which provide contact closures to control the motion picture projector or any associated device.

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