RTFA: http://scitation.aip.org/getabs/servlet/GetabsServle…
Typical sounds of several fish species have been uniquely recognized using an automatic spectrum-matching machine known as SCEPTRON® pattern recognizer. A variety of natural underwater sound recordings from different marine laboratories were used to obtain the samples of fish sounds and to evaluate the SCEPTRON device’s capability in this application. The technique utilizes 2000 narrow-bandpass filters in the form of tiny resonant quartz fibers to provide a highly detailed memory of the sounds in a miniature size. The SCEPTRON memory is self-conforming, and extracts common spectral features from a signal group during the programming process. Operation is in real time, in the audiofrequency range. A description of the SCEPTRON apparatus is presented, together with data showing performance with marine-life sounds. ©1964 Acoustical Society of America
So we’re clear, this is a paper from 1964 using quartz to perform signal detection. Quartz, is in the crystal and its physical properties… as in completely analog (as opposed to digital)… as in it functions because of what it is rather than what it represents.
Follow-up to a previous post, Use BOINC framework to analyze whale/bird songs
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