Computer Communication and Networking Difference Between Analog and

Computer Communication and Networking: Difference Between Analog and Digital Signals Model 5 Assignment #5 Online Video Presentation

Definition of Analog and Digital Signals Analog signal is defined as a continuous signal which represents physical measurements. Digital signals are discrete time signals generated by digital modulation

Waves of Analog and Digital Signals Analog Signals : Denoted by sine waves Digital Signals : Denoted by square waves

Representation of Analog and Digital Signals Analog signal : Uses continuous range of values to represent information Continuous function V of continuous variable t V(t) Digital Signals : Uses discrete or discontinuous values to represent information Discret function Vk of discrete sampling variable tk Vk=V(tk) where k=integer

Example of Analog and Digital Signals Analog signal : Human voice in air Digital Signals : CDs, DVDs

Memory of Analog and Digital Signals Analog signal : Stored in the form of wave signal Digital Signals : Stored in the form of binary bit

Errors of Analog and Digital Signals Analog signal : usually giving considerable observational errors Digital Signals : free from observational errors

Power of Analog and Digital Signals Analog instrument draws large power Digital instrument draws only negligible power

Realtime and Bandwidth of Analog and Digital Signals Analog signal processing can be done in real time and consumes less bandwidth Digital signal processing may be done in non-real-time and consumes more bandwidth to carry out the same information.

Use of Analog and Digital Signals Analog signal: Best suited for audio and video transmission. Digital signal : Best suited for Computing and digital electronics. .

Flexibility of Analog and Digital Signals Analog signal Analog hardware is not flexible. Digital signal Digital hardware is flexible.

Response to Noise of Analog and Digital Signals Analog signal: More likely to get affected. accuracy is reduced Digital signal : noise-immune.

Conversion between Analog signals and digital signals Analog signals can be converted into digital signals by using a modem.