. The Bell System technical journal . peration of the driving motors, and the tuning-and-spacing of the valves is verified. Fig. 4 is a schematic diagram of the studio equipment for soundrecording. Provision is made for combining if desired the contri-butions of several microphones on the set. This combination is 178 BELL SYSTEM TECHNICAL JOURNAL under the control of the mixer operator in the monitoring room,viewing the set through a double window in the studio wall. Themixer controls also the gain of the amplifiers for the recording diagram shows relays which permit the mixer to
. The Bell System technical journal . peration of the driving motors, and the tuning-and-spacing of the valves is verified. Fig. 4 is a schematic diagram of the studio equipment for soundrecording. Provision is made for combining if desired the contri-butions of several microphones on the set. This combination is 178 BELL SYSTEM TECHNICAL JOURNAL under the control of the mixer operator in the monitoring room,viewing the set through a double window in the studio wall. Themixer controls also the gain of the amplifiers for the recording diagram shows relays which permit the mixer to connect thehorn circuit either directly to the recording amplifier or to one or theother of the monitoring photoelectric cells in the film direct connection is used in preparing the sound pick-up in thestudio: the program is rehearsed until satisfactory arrangement ofmicrophones and of amplifier gain is effected. The electrical charac- AMPLIFIER ROOM MUALizER-B-PRE- | RECORDING ROOMFERABLY A CONSTANT!IMPEDANCE EQUALIZER. D-86692AMPLIFIERS -T?-^ /fy-540-AW N^ U/ CONE I MONITOR ROOM I ^^ I Fig. 4—Schematic diagram of the studio equipment for sound recording. teristic of this direct monitoring circuit is so designed that the soundquality heard in the horns shall be the same as the quality to beexpected in the reproduction of the positive print in the treatment of the walls of the monitoring room secures thereverberation characteristic of the theater, and the monitoring levelis so adjusted that the mixer operator hears the same loudness thathe would wish to hear from the theater horns. It is capitally im-portant that the operator judge his pick-up on the basis of soundclosely identical in loudness and quality with that to be heard later intheater reproduction. After the pick-up has been established on the direct monitoring SOUND RECORDING WITH THE LIGHT VALVE 179 circuit, the output of the recording amplifier is applied to the lightvalves and the mo
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
