Cinematographic annual : 1930 (1930)

Record Details:

Title:
Cinematographic annual : 1930
Date:
1930
Publisher:
Hollywood : The American Society of Cinematographers, Inc.
Volume:
Cinematographic annual : 1930
Leaf #:
000325
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Richard Koszarski","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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THE NATURE OF SOUND 305 but, of course, it is no longer sound. However, it can be reconverted into sound by devices like receivers and loud speakers. One of the problems of the sound engineer is to make this electric current vary in exactly the same pattern or wave form that characterized the original sound. Also, since the current variations produced by the sound are very small, another problem is to amplify them and still keep them true to the original wave pattern, in other words to have "distortionless" amplification. In an ordinary telephone system, the message travels as *\ varying electric current in the wires and is not reconverted into sound until it reaches the telephone receiver at the far end of the line. In a sound studio, this varying electric current may be put to work in various ways. It may operate a stylus which cuts a wavy groove in a wax disc, it may operate a light valve which allows a varying amount of light to fall on a moving film, it may move a small mirror and cause a beam of light to trace a wavy line on a film, it may control the glow from an Aeo light, or it may be made to control other devices. In any case, whatever it accomplishes must be a true facsmile or similitude of the way in which the air pressure varied in the original sound. The sounds from an orchestra or a chorus or from a single voice produce an exceedingly complicated wave pattern and the duty of the recording apparatus is a difficult one.