THE DIGITAL SIGNAL


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THE DIGITAL SIGNAL
THE DIGITAL SIGNALA digital signal is one that contains two distinct values. These values are often considered to be on and off, or 1 and 0. An analog signal, on the other hand, is one that contains an infinite number of voltage values. A digital signal is represented in Fig. 7-1. As illustrated, if zero voltage is present at point A, it is considered a digital 0; 5 V positive at point A is considered a digital 1. In this circuit the digital 0 is created when the switch is open. The digital 1 is created when the switch is closed, thus connecting point A to the 5-V positive source.
Citation
Thomas K. Eismin: Aircraft Electricity and Electronics, Sixth Edition. THE DIGITAL SIGNAL, Chapter (McGraw-Hill Professional, 2014), AccessEngineering Export