(svar til dk.videnskab )
Hvem havde lige forestillet sig at Albert Michelson fra 1800-tallet designede flere analoge spektrumanalysatorer / Fourier-analysatorer:
17 Nov 2014, Pre-digital computer 'cranks out' Fourier Transforms. Boffins get a handle on pre-digital computer, restore it to working order:
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Citat: "... designer Albert Michelson ... As ?Engineer guy? Bill Hammack explains in the video below (third in his series), the machine operation is surprisingly simple: the user sets the wave they want analysed in the rocker bars of the machine and turns the crank. The pen outputs the coefficients - in other words, the sine waves (fundamental and harmonic) that make up the input function, and their relative amplitude. ... That limits it to analysing a waveform with 20 samples. However, as they note in the book, Michelson also constructed an 80-sample machine. ..."
Se fx:
(3/4) Analysis: Explaining Fourier analysis with a machine:
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(4/4) Operation: The details of setting up the Harmonic Analyzer:
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Fra serien:
(1/4) Intro/History: Introducing a 100-year-old mechanical computer:
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(2/4) Synthesis: A machine that uses gears, springs and levers to add sines and cosines:
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(3/4) Analysis: Explaining Fourier analysis with a machine:
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(4/4) Operation: The details of setting up the Harmonic Analyzer:
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Glenn