An Optical Harmonic Analyzer

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Abstract
An instrument has recently been completed which makes a Fourier analysis of a function by optical means. It is especially adapted to the analysis of speech and music, since it operates directly from a conventional type of sound track on film. The first 30 harmonics can be measured, the time required being a little over one minute. A similar analysis by methods previously available would require several hours. The instrument will handle fundamental frequencies from 65 to 310 cycles, and the amplitude range is about 35 db. A description of the construction and operation of the instrument will be given, together with a discussion of its capabilities and examples of its work.

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