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May, 1930] WESTERN ELECTRIC RECORDING SYSTEM 527
sound film production is that of re-recording and scoring. The apparatus required for this work is essential for the proper production of a finished product. If it is desired, for example, to introduce music or any extraneous noise which it has been economically not feasible to introduce in the original recording, these effects may be added later. To do this it is necessary to re-record from a positive print and at the same time introduce the other desired effects. This must all be done in synchronism and frequently must be accompanied by a picture run in synchronism also. Standard theater projection equipment is not suitable for reproducing the sound for this purpose because too much noise would be introduced. The frequency characteristic t>f the original film must be somewhat altered for proper re-recording and hence special apparatus must be provided to do a satisfactory job. Whenever effects are added of this kind it should also be done from a monitoring position in a monitoring room so that the true effect from a theater standpoint of what is going on to the film can be observed. From this standpoint the technic is identical with the original recording. As producers frequently release on disks as well as film it is also necessary to provide film to disk re-recording and also in some cases disk to disk re-recording. All of these problems are somewhat different and to produce a satisfactory result must be treated in a different manner. Equalizers are frequently necessary in order that the re-recorded sound will compare favorably with that originally picked up in the studio. Film to disk re-recording is usually made after the picture is finally cut as the sound is recorded on disks in synchronism with the finished picture.
Review Room Equipment. — In order that the producer may gauge his results as he produces a picture it is necessary that he have a suitable review room. As it somewhat simplifies the cutting problem in sound film production to make a separate track for the sound apart from the picture, it is desirable to have review room equipment consisting of a regular picture projector and a projector equipped for sound only, so arranged that they may be run in synchronism. The review room itself should represent as near as possible an average theater and should be equipped with the same type of amplifiers and loud speakers as are used in theater reproduction. The review room is frequently used as a final check on a finished production and should therefore be very carefully considered in its design and in the equipment used.