1800-tallets analoge spektrumanalysatorer / Fourier-analysatorer

[Glenn]

(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:
http://www.theregister.co.uk/2014/11/17/predigital_computer_cranks_out_fourier_transforms/
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:
https://www.youtube.com/watch?v=6dW6VYXp9HM

(4/4) Operation: The details of setting up the Harmonic Analyzer:
https://www.youtube.com/watch?v=jfH-NbsmvD4

-

Fra serien:

(1/4) Intro/History: Introducing a 100-year-old mechanical computer:
https://www.youtube.com/watch?v=NAsM30MAHLg

(2/4) Synthesis: A machine that uses gears, springs and levers to add
sines and cosines:
https://www.youtube.com/watch?v=8KmVDxkia_w

(3/4) Analysis: Explaining Fourier analysis with a machine:
https://www.youtube.com/watch?v=6dW6VYXp9HM

(4/4) Operation: The details of setting up the Harmonic Analyzer:
https://www.youtube.com/watch?v=jfH-NbsmvD4

Glenn