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Variable Density Greyscale Film for audio
Hi:
I like using variable-density analog B&W negative film optical tracks for audio. The audio characteristics of the film make my mouth-water. Yes, for some wierd reason, the film's audio makes me hungry. Audio signal, in the form of light changing its intensity in a analogous manner to the sound, is shined onto a negative film. The film is developed and playback is accomplished by shining light of a constant intensity onto the developed film. As the light goes through the film, the patterns on the film will change the intensity of the light that is received by a photoelectric cell. The change in light intensity results in a changing electric current which is sent into an amplifier and then to a loudspeaker. http://www.mtsu.edu/~smpte/twenties.html "The Tri Ergon Process uses a technology known as variable density, which differed from a later process known as variable area. The Tri Ergon process had a pattented flywheel mechanism on a sprocket which prevented variations in film speed. This flywheel helped prevent distortion of the audio. Tri Ergon relied on the use of a photo-electric cell to transduce mechanicalsound vibrations into electrical waveforms and then convert the electrical waveforms into light waves. These light waves could then be optically recorded onto the edge of the film through a photographic process. Another photo-electric cell could then be used to tranduce the waveform on the film into an electrical waveform during projection. This waveform could then be amplified and played to the audience in the Theater. The Fox Film Corporation acquired the rights to the Tri Ergon technology in 1927. " The ERPI system, Fox-Case's Movietone, and De Forest's Phonofilm use variable-density recording film audio Regards, Radium |
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