What Causes the Fuzzy Bits in MATLAB Spectrum Analysis?

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love_learning
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MATLAB! Question!

Hi,

http://www.geocities.com/spoutveg10/matlab.JPG

Does anyone know what the "fuzzy" bit at the tops of the spectrum are? I went for a complete guess out of distortion or noise. Any elaboration as to why?

I connected up a Binouli random data source with a sample time of 1, and added a repeat block (x5) to obtain this signal.


THANK YOU VERY MUCH IN ADVANCE! I APPRECIATE YOUR INPUT!
 

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Wait... you performed some operation on random data, and you're wondering why there is any randomness in the result?

I don't know what to say, except you can't expect randomness not to be random.