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The Mechanics of the Film Projector

submitted by Aard Vark

(oritteropo)
9 years 5 months 2 weeks ago

YouTube Description:

Bill tears apart a film projector to reveal the amazing mechanisms used in the pre-digital age to trick the mind into seeing a moving image. He uses high speed photography and animations to show how the projector moves the film intermittently, how a shutter strategically blocks light as the film moves, and how the photo sensor reads the sound. He explains how all these mechanisms are synced.

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7 Comments

I'm curious how multi-channel audio is achieved, as a single waveform would only generate mono sound.

Yes, that's right. The 16mm projector shown here has mono sound and a single audio track. The 35mm cinema films had two tracks for stereo or dolby encoded surround sound.

Jimbo's big bag'o'trivia has a quite good overview here - https://en.wikipedia.org/wiki/Sound-on-film

See also http://entertainment.howstuffworks.com/movie-sound.htm for lots more detail.

I'm curious how multi-channel audio is achieved, as a single waveform would only generate mono sound.

ant

*geek

Adding video to channels (Geek) - requested by ant.

I love mechanical elegance like this. Electronics can do all sorts of fabulous things these days but it's all gone way beyond my understanding. I'm sure there is every bit as much elegance in good programming as there is here but I just can't see it, understand it.

This is such an elegant and simple mechanism, every bit does what it needs to do, and integrates perfectly with all the other parts. Everything just works together as it should. Beautiful.

<---schooled

Interesting, but aren't the majority of cinemas using digital now?

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