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TECHNIC OF RECORDING CONTROL FOR SOUND PICTURES
/. P. Maxfield*
The purpose of acoustic control in recording is to make the sound record so correlate with the picture, that the whole performance becomes pleasing to listen to and easy to understand. It has been found that this result is obtained when the recording is so conducted that the voice, coming from the horn, appears to follow the speaker wherever he or she may go in the set, i.e. when an illusion of reality is obtained.
Before considering this matter in detail, there are one or two preliminary points to be taken up. The first has to do with the nature of the material to be covered by this paper, which is distinctly of a practical nature rather than a theoretical. Any theory which may be discussed is in the form of an explanation of why the technic operates as it does, the technic itself having been successfully used throughout several commercial productions.
The second preliminary matter is a brief review of some of the material, which has been mentioned previously from a theoretical standpoint, and which should now be discussed from the point of view of its practical use in the making of talking pictures.
Dr. Knudsen discussed the curves shown in Fig. 1. The discussion here will deal only with the one marked E(n). The vertical ordinate represents energy of speech, corresponding to the frequencies shown by the abscissa. Fortunately for those who have to operate the recording equipment, the high maximum occurring at approximately 200 cycles does not indicate maximum intensity or the maximum amplitude, which is obtained at that frequency. The data represented by the curve was obtained in such a way, that the energy shown includes not only the amplitude or the intensity which occurs at any given frequency, but also includes how often energy of that frequency
* Supervisory Recording Engineer, Electrical Research Products, Inc.
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