Mass production of microprocessors reduced their cost. Because of this reason they found the new areas of application: to fulfill various computations, to solve control and signal processing task. Nowadays they can be found not just in industry but also in transportation systems and many more complex domestic appliances. The control problems can be solved by application of analogue means, but digital controllers have some advantages [1]: their parameters remains stable for long time; realized function can be changed only by changing program; digital circuits are robust for noise; single controller in accordance with the speediness, may be capable to control severe plants.
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