Nowadays, people often watch a movie in the cinema. Do you wonder how the moving picture is made and where the voice, noises and music come from?
A cinema film(胶片) has lots of small photographs, each one of which is different from the one before it. Each photograph is brought in front of a strong light, and there it stops for a very small part of a second. This photograph, therefore, appears on the screen, and we see it.
Then the light is covered and the next photograph is moved to the position in front of the strong light. Meanwhile, the metal cover turns away from the light. Then, the second photograph is shown on the screen. This is done again and again, twenty-four times a second. We see about 86,400 different pictures every hour.
The voices, noises and the music are recorded on the side of the cinema film. The record looks like marks of strange shapes. The side of the film passes in front of another light, and the rays of the light which pass through change as the marks(标记) change. These marks have been made from the voices and other sounds of the people and events before the film is being shown on the screen. The marks may be considered as "printed sounds".
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