Analog and Digital Signal

by:M. Ilham Akbar

125060300111049

An analog signal is any continous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity.

Analog Signal Form

Standard Unit

Speed >> hertz (Hz) in second

Amplifier

• To Amplify (message & noise)

Analog wave called baud.

Digital signals must have a finite set of possible values. The number of values in the set can be anywhere between two and a-very-large-number-that’s-not-infinity. Most commonly digital signals will be one of two values – like either (0V and 5V) or (0 and 1). Timing graphs of these signals look like square waves.

Digital Signal Form

Digital Signal Processing

Analog to Digital Conversion

Analog signal limitation >> susceptible to noiseDigital signal superiority>> stable quality

With the result that

Combination of Analog and Digital signal

Analog to Digital Conversion

An analog to digital converter converts a continuous physical quantity (usually voltage) to a digital number that represents the quantity's amplitude (0 and 1).

ADC Process

Sampling Quintizing Coding Multiplexing

• Continous• Good for low traffic comunication• High possibility to error• Hard to fix an error• Susceptible to noise• Small information capacity• Hard to modificate the signal• Frequency-based concept• A lot of bandwith

• Discrete• Good for high traffic

communication• Small possibility to error• Easy to fix an error• Resistant to noise• Bigger information capacity• Easy to modificate the signal• Time-based concept• Less bandwith

Analog