Principle of communication system

Principles of communication pdf

The goal of the receiver is to capture and reconstruct the signal before it passed through the transmitter i. It could be a receiving station where the signal transmitted is received. Hence, a signal can be a source of energy which transmits some information. The binary digits which has only 1s and 0s are mostly termed as digital values. Hence, the signals which represent 1s and 0s are also called as digital signals. But for a signal to get transmitted to a distance, without the effect of any external interferences or noise addition and without getting faded away, it has to undergo a process called as Modulation, which is discussed in the next chapter. Both types of media are considered unguided because there are no connecting cables between the transmitter and receiver. Conveying an information by some means such as gestures, sounds, actions, etc. Air is the only thing between the transmitter and receiver for RF communication while in other cases, like sonar, the medium is usually water because sound waves travel efficiently through certain liquid media. Language and gestures play an important role in human communication, while sounds and actions are important for animal communication. What is a Signal? This signal has its pattern continued repeatedly and is easy to be assumed or to be calculated. The communication based on analog signals and analog values is called as Analog Communication.

For instance, the attendance of the class on Wednesday is 20 whereas on Saturday is An electrical impulse or an electromagnetic wave which travels a distance to convey a message, can be termed as a signal in communication systems.

This signal has its pattern continued but the pattern is not repeated and is not so easy to be assumed or to be calculated. For example, a baby in a cradle, communicates with a cry that she needs her mother.

Digital Signal A signal which is discrete in nature or which is non-continuous in form can be termed as a Digital signal. A person communicates with the help of a language.

Principles of communication pdf

It could be a receiving station where the signal transmitted is received. Output transducer[ edit ] The output transducer simply converts the electric signal created by the input transducer back into its original form. Example Let us consider a classroom having 20 students. Periodic Signal Any analog or digital signal, that repeats its pattern over a period of time, is called as a Periodic Signal. Digital Signal A signal which is discrete in nature or which is non-continuous in form can be termed as a Digital signal. The Receiver is the person who receives the message. Transmitter[ edit ] Once the source signal has been converted into an electric signal, the transmitter will modify this signal for efficient transmission. A person communicates with the help of a language. For example, a person will not continuously brush his teeth from morning to night, that too with the same time period. If you try to plot the varying portions of water in the tank, according to the varying time, it would look like the following figure. Example If we consider a machinery in an industry, the process that takes place one after the other is a continuous and repeat procedure. While the means of communication, can be anything such as gestures, signs, symbols, or a language, the need for communication is inevitable.

But for a signal to get transmitted to a distance, without the effect of any external interferences or noise addition and without getting faded away, it has to undergo a process called as Modulation, which is discussed in the next chapter.

Parts of Communication System Any system which provides communication, consists of the three important and basic parts as shown in the following figure.

principles of electronic communication systems

Periodic Signal Any analog or digital signal, that repeats its pattern over a period of time, is called as a Periodic Signal.

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Communications system