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The sound spectrograph machine was invented at Bell Telephone Laboratories in the early 1940s. The device remained a military secret until the end of WWII due to its potential use in applications such as underwater surveillance. The first paper describing the device was published in the Journal of the Acoustical Society of America in 1946 by Bell Labs engineers W. Koenig, H.K. Dunn, and L.Y. Lacy (The Sound Spectrograph, J. Acoust. Soc. Am., Volume 18, Issue 1, pp. 19-49). The Kay Elemetics Corporation was soon formed to manufacture and sell the device. The machine was widely used for several decades in analyzing acoustic signals of all kinds, but especially speech and birdsong. The machine was eventually supplanted by software analyzers using methods such as Fourier analysis and linear predictive coding.

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Q: Who invented the Kay sonograph?
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