Arthur Hannah Price

US Patent:

41651596, Aug 21, 1979

Filed:

Mar 28, 1978

Appl. No.:

5/890889

Inventors:

John V. Landau - Mountain Lakes NJ
Marvin I. Mindell - Pittsford NY
William T. Daly - Rochester NY
J. David Garland - Passaic NJ
Arthur B. Price - Byron NY

Assignee:

The Singer Company - New York NY

International Classification:

G11B 3100
G09B 100
G03B 2100

US Classification:

353 15

Abstract:

A microprocessor is utilized to monitor and control the operation of an image projector and a magnetic tape cassette player. Inaudible cueing tones recorded on the tape allow the recorded narrative to be kept in synchronization with the image projected. A sync counter within the microprocessor keeps track of the amount and direction by which the image and tape are out of synchronism. The microprocessor controls a visual indication to the operator that shows the direction in which the tape must be moved to regain synchronization. When the tape is moved forward to achieve synchronization, the microprocessor will stop the tape after the cue pulse that precedes the narrative for the associated image. When the tape is moved in the reverse direction to achieve synchronization, the microprocessor will stop the tape just beyond the cue pulse at the beginning of the desired narrative. Accordingly, when the tape player is placed into the play mode, the microprocessor will mute the audio until that cue pulse is sensed and inhibit the normal film advance for that cue pulse.