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!!!