- We can send information both in analog and digital system.
- Analog signal varies continuously with respect to time.
- When we increase volume or amplitude of the sound, it causes the fluctuations of the current or voltage to increase proportionally.
- Though the waveform or shape remains same.
- In digital the values are at discrete intervals.
Digital System – Advantages
- Digital system based on a number of discrete level, 2.
- Digital system are less affected by noise. If the noise is below a certain level, it will have no effect.
- Digital signals can be regenerated to achieve loss less data transmission, within certain limits.
- Digital system interface are easy to control with software.
- We can add features to a digital system without changing hardware, just by uploading new software.
- Information storage can be much easier in digital systems than in anolog ones.
Digital System – Disadvantages
- If a single piece of digital data is lost then large blocks of related data can completely change.
- Digital circuits are made from analog components. So we can not avoid the analog nature of these components
- Digital circuits use more energy than analog circuit to accomplish the same calculations and signal processing task, thus producing more heat as well.
Types of Digital System
- Digital system divided into combinational system and sequential systems.
- A combinational system always present the same output when given the same inputs
- A sequential system is a combinational system with some of the outputs fed back as inputs.
- This makes the digital machine perform a “sequence” of operations.
Types of Sequential System
- Sequential system divide into two further sub-categories, synchronous sequential system and asynchronous sequential system.
- Synchronous sequential system change state all at once, when a clock signal changes state.
- Asynchronous sequential system propagate changes whenever input change.
