Signal & System – geeksforjobs


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We know that signals are playing an important role in communication systems. Nowadays every electronic device is connected to a signal. Signals are used to transfer information from one place to another through the system. The system is connected with signals. It can access information from the signal and process the information and gives proper output.

The signal

A sign is anything that conveys some information called a sign. They are no rules for signal to signal. Anything that transfers data from one system to another is called a signal. The information that has been stored will be in digital form. Data in digital form will be conveyed by the signal without changing its form.


The meaningful interrelation of physical devices is called a system. Meaningful physical devices will be electronic devices. These electronic devices have the ability to store information in digital form.

The signal can be represented mathematically. The mathematical form will vary. They are:

-> Single variable representation

-> double variable representation

-> multi variable representation

The signal depends on its amplitude and time variables. They are classified into 3 types based on the amplitude and dependence of the signal over time.

They are:

-> constant time signal

-> discrete time signals

-> Digital Time Signal

Constant time signal

Constant time signal bots are continuous in time and amplitude. There will be continuity in both amplitude and time of signals.

Discrete time signal

Discrete time signals are discrete in time and continuous in amplitude.

Digital time signal

Digital time signals are discrete in time and quantified in amplitude.

Deterministic and non-deterministic (random) signal

Signs that can be represented mathematically are called deterministic signals. Signs that cannot be represented mathematically are called non-deterministic signals.

Even signal and odd signal

When the signal remains the same during the inverse operation of time, the signal is called equal signal or symmetric signal. If the signal remains constant under reversal operation over time and the amplitude changes to the reversed amplitude asymmetric signal or asymmetric signal.

Also for hints: X

For odd signal: X (-t) = – X

Here x

Causal Signal and Non-Causal Signal and Anti-Causa Signal

If t <= 0 for X

If t> = 0 for X

If x

Periodic and non-periodic signals

If a signal has a certain pattern that repeats repeatedly from negative infinity to positive infinity then that signal is called a periodic signal. If not, that signal is called a non-periodic signal.

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