hacking the 16mm optical track, notes
projector exciter circuit
there is a 26 frame offset between picture and sound
ie: 1.0833 seconds
- amplitude modulation: more light => more sound
- amplitude is the height of the wave, and
- frequency is the distance between wave crests
film moves at 24fps
there are 40 frames per foot, so film runs through the sound gate at 7.2inches/sec
to make middle C you would draw a waveform with 512 cycles per second. graphically that works out to:
512cps/7.2in = 71cycles per inch
- how hard is it to print on clear leader?
- is it easier to slice & cut sprocket holes in acetate?
- would scratches make the same tone (with a buzzy overtone?)
- look at this: [etufte link]
- how much work to make a simulator? [proce55ing, yum!]
- how much work to generate very long PDF from an audio file?
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- Published:
- 06.25.08 / 7am
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- notes
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