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 #:
000315
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 OP SOUND 295 WAVE FRONTS If sound were started from a small vibration out in open air, the pressure waves would spread out in all directions and the IV FIGURE 4 "wave-front" would be a curve, whose center is the vibrator. As the sound goes farther and farther any small portion of this wave-front becomes more and more straight or flat and we come to speak of plane waves. REFLECTION If the sound wave-front strikes some hard surface it is reflected and its direction is changed. Thus if WW (Fig. 3) represents one of a series of wavefronts proceeding in the original direction AB and striking a reflecting surface SS, then WW' shows the wave-front after reflection, going in the direction A'B'. Or, if the reflecting surface is curved, the action may be as in Fig. U where there is a tendency toward focusing or concentration. The result of reflections is often to give the effect of a sound coming from behind a surface or from a direction very different from the real direction of the source of sound; in other cases it results in echoes, or in confusing overlapping of