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What is the signal? Classification of signals

December 22, 2020 by imBooz Leave a Comment

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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.
Example :

(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).

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Classification of signals:

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
any value.
0<A<1 the amplitude compress by a factor A
A>1 then the amplitude is stretched by factor A

Filed Under: Semiconductor Tagged With: amplitude, Classification of signals, signal

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