[PD] Spectrum graphing amplitude problem

Martin Peach martin.peach at sympatico.ca
Tue Oct 23 01:15:48 CEST 2007

Charles Henry wrote:
> On 10/22/07, Martin Peach <martin.peach at sympatico.ca> wrote:
>> Mathieu Bouchard wrote:
>>> A very simple way to explain aliased frequencies would be: spin a bicycle
>>> wheel. When you accelerate it beyond a certain point, it will begin to look
>>> like it's going backwards instead. This is because the wheel speed,
>>> together with the repetitiveness of the wheel's appearance, have crossed
>>> the Nyquist frequency of your eye.
>> That won't work in sunlight for example.
> Haven't you ever seen it?  (in sunlight that is)
No. The spokes just look blurred. Have you? If you try it at night under 
a streetlamp then you get the effect. I'm sure I have analog eyes ;)


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