If you are using Internet Explorer 4.0, or Netscape Navigator 4.0 with the Java 1.1 upgrade, try the Java 1.1 version instead. Any component of a sampled signal with a frequency above this limit, often referred to as the folding frequency, is subject to aliasing .
Outline instructions The input signal frequency, in Hz, is typed into the text box.
When you click the Plot button, with Input signal checked, the input signal is plotted against time. The Grid checkbox toggles on and off vertical gridlines indicating the instants at which the signal is sampled. The Sample points , representing the sampled values of the input signal, can also be toggled. You need a Java-enabled browser to view this applet. See the Java 1.1 version page for an explanation of how to use the applet to illustrate how aliasing arises.