Q: What is the signal? Define Amplitude is an important variable parameter of the signal. What kind of operations can be performed with amplitude?
The signal is a function that conveys some information. A signal is defined as a physical quantity that varies with time, space, or any other independent variable.
(i) Electric voltage or current, such as radio signal, TV signal, telephone signal, computer signal, etc.
(i) Pressure signal, sound signal, etc. are non‐electric signals.
Mathematically, a signal is represented as a function of an independent variable t. Usually, t
represents time. Thus, a signal is denoted by x(t).
1. Continuous and discrete-time signals 2. Analog and digital signals
3. Deterministic and random signals 4. Even and odd signals
5. Periodic and non‐periodic signals 6. Energy and power signals
Amplitude scaling :
Consider a signal x(t) is provided and we have to scale or multiply it by factor A, where A can be
0<A<1 the amplitude compress by a factor A
A>1 then the amplitude is stretched by factor A