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Proceedings Paper

Timing Signal Generation And Film Annotation In Biomechanics Cinematography And High-Speed Photography
Author(s): LeRoy M. Dearing
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Paper Abstract

The characteristics of typical timing signal generating systems are discussed. These general serial time codes, usually a succession of 0 to 5 volt DC pulsed from 10 to 10,000 HZ. Such generators produce signals for Time Pulse codes, Coded Time Pulse Codes, IRIG Time and Control Code, NASA Time and Control Code and SJ1PTE Time and Control Code. These signals are often generated together with the decoder and driving current, or the signal will be inputed from outside sources, decoded and converted into drives to pulse the light emitting diodes displays in "on camera" film data annotation systems. Typical time data annotation systems include simple camera timing markers for exposing a narrow time or data track along the edge of the continuously moving film. Systems which record 9 or more digits of time and other data on each frame of film are: BCD, i.e., 4 x 9 numeric data annotation systems; 7 segment LED characters for recording numeric time or hexidecimal information; lastly, data annotation systems using 5 x 7 LED matrices to record full alphanumeric (ASCII) characters, including numeric time. The advantages and limitations of these systems are considered.

Paper Details

Date Published: 24 February 1982
PDF: 6 pages
Proc. SPIE 0291, 2nd Intl Symp of Biomechanics Cinematography and High Speed Photography, (24 February 1982); doi: 10.1117/12.932292
Show Author Affiliations
LeRoy M. Dearing, L. M. Dearing Associates, Inc. (United States)

Published in SPIE Proceedings Vol. 0291:
2nd Intl Symp of Biomechanics Cinematography and High Speed Photography
Juris Terauds, Editor(s)

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