Aliasing

Q: What is Aliasing?
A: In digital signal reconstruction, if a "high" frequency signal is sampled at a "low" frequency, the reconstructed signal will be different from the original. This "low" frequency signal is an Alias of the high frequency signal. For example: Take your everyday normal Sine function curve. The sine curve has a value of zero at angles 0, 180 degrees, 360 degrees and so on. If this curve is sampled at these "zero" points and reconstructed, the resulting curve will be a straight line y=0 (much different than a periodic sine function).

On the way to a friend's wedding (Bombardier Dash 8-300). Taken June 20, 2009. The engine manufacturer's website claims propeller speed to be around 1200-1300 rpm. From the video, I calculate approximately 8 rpm. Not sure if my camera (Sony DSC H50) captures at 24 or 30 fps. Anyways, I found this to be really cool! Enjoy!

Category:

Science & Technology

Tags:

• Aliasing
• Propeller
• Camera
• stroboscope
• Air
• Canada
• Bombardier
• Dash 8
• Planes
• Digital
• Signal
• Reconstruction
• Alias
• nyquist
• frequency
• shannon's
• sampling
• theorem

[Acecombatgamer]

cool

[pumpmaster760]

LOL that sure is one hell of a slow prop!

[somedudenamedalex]

It's like those rims on gangsta cars! Well, maybe not quite.