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John G. Webster (Editor) 's 15.Consumer Electronics PDF

By John G. Webster (Editor)

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If the user presses the ͙x key, the square-root function is performed. But if the user first presses the Shift key and then the ͙x key, the x-squared function will be performed instead. Advanced scientific and graphing calculators provide systems of menus that let the user select operations. These menus may appear as lists of items in the display, which the 573 user can scroll through using arrow or cursor keys and then select by pressing the Enter key. Changeable labels in the bottom portion of the display, which correspond to the top row of keys, can also be used to display menu choices.

The pixels in an LCD display can be darkened individually and so can be used to plot function graphs. The user keys in a real-valued function of the form y ϭ f(x) and makes some choices about the scale to use for the plot and the set of values for x. Then the calculator evaluates f(x) for each x value specified and displays the resulting (x, f(x)) pairs as a function graph. Graphing calculators can also plot polar and parametric functions, 3-D wireframe plots, differential equations, and statistics graphs such as scatter plots, histograms, and box-and-whisker plots (see Fig.

The display is an output device, since it allows the calculator to convey information to the user. Early calculators, and today’s simple calculators, make do with only these input and output devices. But as more and more memory has been added to calculators, allowing for storage of more data and more extensive programs, the keypad and display have become bottlenecks. Various means have been developed to alleviate these bottlenecks. Small magnetic cards have been used, as well as RAM cards that can be plugged into a calculator.

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15.Consumer Electronics by John G. Webster (Editor)

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