7. advantages of digital system
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This document discusses several key aspects of digital signals and systems. It notes the advantages of digital signals like noise immunity, encryption, and higher efficiency over long distances. It then explains how increasing the number of levels in a digital signal makes it more accurate, similar to adding more letter grades instead of just pass/fail. The document also outlines how digital systems use only 0s and 1s to represent open and closed switches in increasing powers of 2 as more switches are added. It defines a truth table as a table representing all possible results from combinations of switch states.
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7. advantages of digital system
- 2. Noise immunity. Less use of band width. Encryption. Efficiency is higher for long distance. These are only the basic advantages. More advantages can be learn from any standard book. Increase in number of levels makes the digital signal more accurate.
- 3. We can take an example of grading scheme. Lets we have 100 students attending a paper. We have two levels 0-50-100. So it is not good to say 0 to 50 are fail amt above then 50 are pass. We need more levels. Hence we divide it like grade A,B,C,D,E,F..
- 4. In digital system we use 0 and 1 only. 0 represent off. 1 represent on. Close switch represent 1. Open switch represent 0. For each switch we have two case 0 and 1. Increase in number of switch increase 0 and 1 as power of 2.
- 5. As we know about on and off of switches. According to these switches there are some results. Representing all possible results in a table is called truth table. No of rows depends on switches. We use formula 2^n to get no of rows. N is the number of switches in a case.
- 6. A(Switch 1) B(Switch 2) Result according to a case 0 0 0 1 1 0 1 1