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The Show Always Goes on with the
ROBIN-IMPERIAL STEDYPOWER
The Generator Preferred by Projectionists Everywhere
Forty years of electrical and motion picture experience are built into the Robin-Imperial Stedypower motor generator, used wherever pure D. C. power is required. There is no
multiple types rated at 36-4260 volts for all Suprex arcs — whether the 1 K. W. or the standard Suprex types. The
There Is No Substitute for Generated D. C.
same generator unit will also supply current for spotlight operation.
Robin-Imperial Stedypower generators are distributed through Independent Theatre Supply Dealers, who will be glad to serve your every projection need swiftly, efficiently and courteously. On your next visit to your Independent Dealer ask for details concerning the Robin-Imperial Stedypower generator — the projectionists' favorite D. C. power source.
substitute for experience, just as there is no substitute for generated D. C. power.
There is a Robin-Imperial Stedypower generator available for every type of motion picture projection arc lamp service, including
J. E. ROBIN. Inc
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New York, N. Y.
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from the sound print. It has since been found, however, that it is an easy matter to provide too great a volume range for satisfactory theatre reproduction. The general noise level which exists in a theatre, caused by normal audience movements, heating systems, ventilating systems, and operations in the projection booth, determine the minimum sound level necessary for a high degree of intelligibility. The type of scene portrayed on the screen and general comfort of the theatre patrons, on the other hand, determine in a general way the maximal sound level which may be employed. Studies of a large number of theatres have indicated that the difference between the maximum level and the minimum level varies between 25 and 35 db. Since the volume range existing in the original dialog and music recorded for a picture is usually considerably in excess of 40 db, it is evident that satisfactory reproduction in a large variety of theatres can only be obtained if an arbitrary reduction in volume range is accomplished. To this end, electronic volume compressors are installed in each of the recording and re-recording channels at the studio, and are normally operated so that the original volume range of 50 db is compressed to a final volume range of the order of 30 db.
The compressors used in recording are essentially amplifiers whose gain is controlled by the instantaneous peak value of the signal passing through the amplifier. Gain control is effected by rectifying a portion of the signal current and impressing the rectified voltage on the control grids of a pair of remote cut-off amplifier tubes in the compressor units.
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INTERNATIOIVAL PROJECTIONIST