Motion picture sound engineering (1938)

Page scan 000306 from Motion picture sound engineering

Record Details:

Title:
Motion picture sound engineering
Date:
1938
Publisher:
New York : D. Van Nostrand Company, inc.
Volume:
Motion picture sound engineering
Leaf #:
000306
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 08, 2025
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276 MOTION PICTURE SOUND ENGINEERING Frequency f/f I.L. from (c.p.s.) r/ra Chart II 1,000 0.34 ___, 0.4 2,000 0.68 1.6 3,000 1.02' 3.1 4.000 1.36 4.5 5,000 1.70 6.0 7,000 2.3 8 8.4 10,000 3.4 11.0 Figure 177 shows the full-shunt equalizer for these values of the electrical elements and the corresponding insertion loss characteristic. 1000 FREQUENCY 2000 4000 7000 1O000 Figure 177 — Circuit and insertion loss characteristic of Example 2. Example 3, Design and show the insertion loss characteristic for a bridged T, Type II equalizer having 7 db insertion loss at 50 c.p.s. when operating in a 125 ohm circuit. Referring to Chart III, which applies to the Type II equalizers, we have for 7 db loss, -j =0.5. Since, for this condition f = 50 c.p.s., the value of fa becomes 50 fa = -^ = 1 00 c.p.s. and R0 — 125 ohms