Film Projector
In a film projector, the film travels at 24 frames/sec in an intermittent motion – ie, the film is absolutely stationary when light is allowed to pass through the picture frame onto the screen. The film is pulled down to the next frame only when the light path is totally cut off. Now, again the film is held rock-steady while the light path is reopened to form the successive picture on screen, and so on at the rate of 24 still pictures per second. The soundtrack of the film (which is imprinted at the side of the picture frames on the same celluloid film), also then moves in the same intermittent motion. Audible jerks should be expected, because we know that a soundtrack has to pass over the sound-head at a constant speed for faithful reproduction. Why don’t we hear them?
Labels: thinktank
posted by Rajesh Lal at
8:28 AM
6 Comments:
The only explanation I can think of is the following...
It could also be asked why we don't notice the time when the screen is black (in between frames). Although we do in fact see these black screens, our brains do not register them because they pass so quickly.
I am thinking the same could be true for sound. That is, there are breaks in the sound, but they are too short for us to notice. Similar to how our brains piece together several still pictures to make an animation, we may also be able to do this with sound?
The sound is either several frames before or after the associated picture frame. The film is made into a buffer loop just before or after the shutter and played there. So it runs smoothly.
This post has been removed by the author.
The sound info is read just before the film enters into the free standing loop where the film is jerked at 24 frames per sec.
Dear Author trickofmind.com !
The authoritative point of view, it is tempting
I want to quote your post in my blog. It can?
And you et an account on Twitter?
Post a Comment
Links to this post:
Create a Link
<< Home