4. need of digital signal
- 2. Important Points All real life signals are analog. Analog signal seems to be better then digital but they are not. Digital signals are used in communication Process. Digital signal are used minimize the effect of noise. Noise is unwanted signal. It is very important to understand this concept so that we may get further knowledge. Lets take it as example.
- 3. Example We need a transmitter to transmit signal and a receiver to receive that signal. For their connectivity we need some source or medium like channel(cable).
- 4. Example Lets have values we have to transmit the signal of 2.5 v and we have the range of transmitter up to 5v. When we transmit this signal value will be changed due to effects.
- 5. Example We suppose that receiver receives a signal of 2.7 with effect of 0.2. This 0.2 is the noise which will removed in digital system. Have a look in case of digital.
- 6. Example As we know that we have the certain levels in digital system. We will have value according to levels only. In this case we have limit 0-5 so we have 4 levels and if the noise comes then the effect is neglected. So we get the accurate signal. In real life we can have example of movies. In HD print we have two type 720 and 1080. Both have different space because of their levels more levels need more space.
- 7. Important This is applicable only for small signals. For long signal we have many advance methods Special devices are used to convert the analog signal into digital signal. Digital signals are only in circuits. We cant see or feel them they exist as soft data exist. Hope you learn it. See you next. Allah Hafiz