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 #:
000204
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 193 mixer purposes. By its use any number of incoming circuits in multiples of two can be effectively joined together on a matched impedance basis with a minimum of transmission loss to form one outgoing circuit, or conversely. More information is given later concerning the design of this transformer for multicircuit use. The basic console circuit has a transmission loss of about 23 db. This is divided among the circuit parts as follows : The volume controls used are of the slide-wire type having a minimum loss of about 6 db. Each of the two-position mixer transformers has a theoretical FIG. 6. Basic console mixer circuit. loss of 3 db, or an actual loss of about 4 db. This makes 8 db for 2 such coils in any circuit. The six-position mixer coil has a theoretical loss of 7.8 db, or an actual loss close to 9 db. Electrical Networks. — The controls for a variety of electrical networks appear in front of each mixer position as shown in the figures. These include variable high and low pass filters, special effects networks, and a generous supply of variable equalizers. Except for the equalizers the networks are of conventional design provided with controls for step-by-step variation of their insertion loss characteristics by means of tapped electrical elements. The variable equalizer networks, called Constant B Equalizers, were specially designed in