hacking the 16mm optical track, notes

projector exciter circuit

there is a 26 frame offset between picture and sound
ie: 1.0833 seconds

1. amplitude modulation: more light => more sound
2. amplitude is the height of the wave, and
3. 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:

• 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?