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CHAPTEK VIII
Sound, Sound Recording, and Sound-Recording Characteristics
Introduction
Sound may be recorded upon a large number of different media, such as films, disks, cylinders, wires, and even on magnetic iron dust that is coated upon the surface of a strip of filmlike material 16-mm wide and perforated like motion picture film. Only photographic recording will be discussed in this chapter. Although other media may find wide application in making original recordings and for purposes other than the association with pictures in a sound film, such media will be compelled to show markedly superior performance at appreciably lower cost before they will become serious competitors to the photographic recording and reproduction of 16-mm sound in release prints.
Although this book will deal almost entirely with photographic recording and reproduction, some mention must be made of magnetic tape and recording and the strides it is making in attempting to establish a place for itself in the production of sound films. As the cost of release printing must be kept low, it seems doubtful that photographic release printing of sound will be displaced by some other foreseeable copying method in the near future. In the making of the original record, however, the same condition does not hold and it is conceivable that magnetic tape recording may displace photographic recording because of quality superiority and lower operating costs. In the present stage, experimental magnetic tape records running at the same linear speed as the commercial 35-mm photographic record show measurably lower distortion and better signal-to-noise ratio. Recording machines have been modified to run either photographic or magnetic records. As there is almost invariably a re-recording step between the edited original and the release negative, it makes little difference functionally whether the synchronized original is made by photographic or other means if the distortion of the recording is a minimum and the signal-to-noise ratio a maximum. Should the operating reliability of magnetic recorders prove of the same high order
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