[GreenKeys] Harmonic Analyzer -- Fourier analysis/synthesis using gears, cams, levers, springs, and the kitchen sinc

[Paul Heller]

Wow Gil. That was something. That machine offers a full semester of high school physics: levers, gears, springs.  And the fact that the pen orientation affects the way the plot is drawn (near the end of the operations video) certainly must be college level physics!

Thanks for sharing. I’ve watched his other videos in the past and they are all interesting to me.

Paul
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> On Jun 14, 2018, at 6:43 AM, Gil Smith <gil at baudot.net> wrote:
> 
> From a bit of dsp research I have been doing lately I ran across this amazing machine designed in the late 1800s.  There are more videos, but these two short ones show the main points:
> 
> "Synthesis" is the combination of sine/cosine waves in a linear system to generate a specific waveform:
> https://www.youtube.com/watch?annotation_id=annotation_2259796885&feature=iv&src_vid=NAsM30MAHLg&v=8KmVDxkia_w
> 
> "Analysis" is the decomposition of a waveform into the frequency-domain (eg: spectrum analyzer):
> https://www.youtube.com/watch?annotation_id=annotation_2259796885&feature=iv&src_vid=NAsM30MAHLg&v=8KmVDxkia_w
> 
> A pretty cool bit of mechanical engineering indeed.
> 
> gil
> 
> 
> gil smith, AF7EZ
> greenkeys moderator
> gil at baudot.net
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