Orginal Time Signal 010020030040.050.060070080.090.1 Interpolated Time Signal 00010.020.030 050.060070.080090.1 FIGURE 21.10 Frequency Content of Oniginal Signal Frequency Content of Interpolated Signal 04 FIGURE 21.11 Defining Terms using a mouse or track ball Graphical user interface(GUI): Interface using pull-down menus, push buttons, sliders, and other ng icons Drag and drop operation: Graphical operation for building diagrams by selecting, copying, and moving i nd-click icons Toolbox: Library of specialized functions. What if"question: Question that allows a user to determine the effect of parameter changes in a problem solution c 2000 by CRC Press LLC© 2000 by CRC Press LLC Defining Terms Drag and drop operation: Graphical operation for building diagrams by selecting, copying, and moving icons using a mouse or track ball. Graphical user interface (GUI): Interface using pull-down menus, push buttons, sliders, and other point￾and-click icons. Toolbox: Library of specialized functions. “What if ” question: Question that allows a user to determine the effect of parameter changes in a problem solution. FIGURE 21.10 FIGURE 21.11