Abstract
THE only reasonable method of frequency analysis applicable to the case of varying sound as yet published is that of Germanśky1 and Brown2, using diffraction of light by varying-density sound-film. But the technical difficulties owing to low dispersion seem to prevent further development in practical applications of that method. I have recently used a very simple photographic method of frequency analysis which can be designed so as to satisfy all the requirements met with in the analysis of any sounds or other vibrations.
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References
Germansky, B., Ann. Phys., 7, 453, (1930).
Brown, D., NATURE, 140, 1099, (1937); Proc. Phys. Soc., 51, 244, (1939).
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IMAHORI, K. Analysis of Varying Sound. Nature 144, 708 (1939). https://doi.org/10.1038/144708a0
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DOI: https://doi.org/10.1038/144708a0
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