Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000210
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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Sept., 1944 RERECORDING CONSOLE, CIRCUITS, AND EQUALIZERS 199 it is obviously not practicable to repeat the process to control the amount of equalization. The use of the constant B attenuator provides an alternate method for controlling the slopes of the equalization curves without using tapped reactors, thus reserving this feature for frequency placement. Consider first the simple conventional constant resistance circuit of Fig. 10. For this circuit the resistors Ro are the same as the associated line resistances. The impedors ZA and ZB are general in nature, composed of any circuit arrangement of resistors, and inductive or capacitive reactors, with the restriction that ZA and ZH CONSTANT B ATTENUATOR ZO — ' * Zo FIG. 11. Constant B equalizer schematic. are mutually inverse to each other, or ZA ZB = R02. Because of this relation, when one of them is known the other is determinable. Hence formulas associated with this network need to include only one or the other of the impedors. Inverse networks are discussed in the aforementioned book.2 The insertion loss of the network of Fig. 10 is: s ^ Decibels Insertion Loss in Db = 20 Logio The general circuit schematic for the constant B design is shown in Fig. 11. The circuit portion included within the dotted lines is the constant B attenuator. Resistors R0 are, as before, of the same