A 200-MIL Variable-Area Modulator
A modulator using a new vibrating-mirror unit has been developed for recording double-width variable-area sound-track. The noise-reduction shutter is at the slit, making it possible to record, with noise-reduction, class A push-pull track comprising two standard bilateral tracks, one of which is located in accordance with the dimensional standards for single track. While this has been its principal use to date, it is readily adaptable for other types of track. A visual monitor shows operation of the noise-reduction shutter and the amplitude of signal modulation in both directions from the base-line with a positive indication of peak over-load. An exposure meter is included to serve as a check on lamp current and track balance. The light-source is a tungsten filament lamp which will properly expose fine-grain emulsions to “white” light or standard emulsions through an ultraviolet filter.
- Print ISSN
- 0097-5834
- Published
- 1941-04
- Content type
- Original Research
- DOI
- 10.5594/J12910