Sound motion pictures : from the laboratory to their presentation (1929)

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THE STUDIO 207 The screening room is fully equipped with a soundreproducing device, and the pictures may be shown and heard just as they would be in a theatre. The apparatus section of a sound studio also contains stock rooms, test rooms, disk-shaving room and rest rooms, as well as offices for the technical staff. Now that, in this section, I have presented the general features of the sound studio, we can proceed to consideration of individual types : The following is a description of the Western Electric sound-recording apparatus and its operation: Plate IV shows a studio recording machine with the door of the exposure chamber open. In this machine the film travels at the rate of ninety feet per minute. The sound track is made at the edge, away from the observer. Adding sound to the picture introduces no complications of technique other than the requiring of sufficient rehearsal to make sure of a satisfactory pick-up of the sound. One or more cameras and one or more sound-recording machines are driven by motors electrically synchronized, from a common distributor. Figure 5 is a diagram showing the studio equipment for sound recording. Provision is made for combining, if it be desired, the contributions of several microphones on the set. The combination is under the control of the mixer operator in the monitor room, who views the set through a double plate-glass window in the studio wall, as indicated in the early part of the chapter. The mixer controls the sound for the recording machines. The diagram shows relays which permit the mixer to connect the horn circuit either directly to the recording amplifier or to one or the other of the monitoring photoelectric cells in the film recorders. The electrical elements of this monitoring system are so designed that the sound quality heard in the mixer horns are the same as the quality to be expected in the reproduction in the theatre.