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 #:
000214
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 RRRRCORDING CONSOLE, CIRCUITS, AND EQUALIZERS 203 All the information needed to design the constant B attenuator portion of Fig. 11 is now before us. Knowing the items expressed in the right side of Kqs (6') or (7), the maximum loss as given by the left side of the equations for each equalization step may be computed. Then by means of Eqs (2) and (3) the values of the tapped resistors RAl and RA, for each equalization setting are obtainable. Since RBl and RB2 are, respectively, inverse to RAl and RA, these resistors may now be computed for each equalization step. The reactances JXi and JX2 are designed to place the half loss frequency fb at the desired place in the frequency range. Because fb remains constant after being established, we may design the reactances in connection with any of the equalizer steps we desire. The most convenient step is the top step where the equalization is a maximum and is also equal to the maximum loss as seen from Eq (7). This means that the minimum loss is zero on the top step or RAl = 0. For this maximum loss condition then, the constant B equalizer circuit of Fig. 11 reduces to the conventional types discussed in Motion Picture Sound Engineering.2 The reactances JXi and JX2 may therefore be designed for the maximum loss condition, in accordance with the information given therein and used with the constant B attenuator. Fig. 12 shows a constant B equalizer circuit and its character FIG. 14. Front view of console equalizer unit.