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Video-serie: *(1/4) Intro/History: Introducing a 100-year-old mechanical computer *(2/4) Synthesis: A machine that uses gears, springs and levers to add sines and cosines *(3/4) Analysis: Explaining Fourier analysis with a machine *(4/4) Operation: The details of setting up the Harmonic Analyzer
Analog Fouriertransformation: 17 Nov 2014, Pre-digital computer 'cranks out' Fourier Transforms. Boffins get a handle on pre-digital computer, restore it to working order: 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..."
66 siders hæfte: Albert Michelsons harmonic analyzer
Links er fra: Wikipedia: Frekvensspektrum