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1. Maris Stella College (Autonomous),
Vijayawada.
Department of Electronics
Semester-III
Course Title: COMMUNICATION ELECTRONICS

2. COURSE INTRODUCTON
ON
COMMUNICATION ELECTRONICS
PRESENTED BY
L.SARALA

3. UNITS:
1.Electronic communication & Analog
Modulation
2.Analog Pulse Modulation
3.Digital Pulse Modulation
4.Mobile Telephony System
5.Antennas & Wireless Communication

4. Introduction to Communication Systems
1. Communication is the process of exchanging information.
2. Most human communication is oral, but a great deal of it is also in written or printed form.
3. The two main barriers to communication are language and distance.
4. Major electrical discoveries in the mid- and late nineteenth century made possible the
development of electronic communications over long distances.
5. The telegraph (1844) and telephone (1876) were the first two long-distance communications
systems.

5. 6. Electronic communications plays a vital role in all our lives and is essential to the success of our
information society.
7.The major elements of a communications system are a transmitter to send a message, a
communications medium, a receiver to pick up the message, and noise.
8. Radio was discovered in 1887, and wireless telegraphy was demonstrated in 1895.
9.The three primary communications media are wires, free space, and fiber-optic cable.

6. Fundamental Model of Communication Systems

7. Message Source: The originator of the message
Input Message: The message/data/info that is to be communicated
Input Transducer: Converts the input message into electrical form
Input Signal: The data in electrical form (this is a baseband signal)
Transmitter: Modifies the signal for transmission
Channel: The medium over which the transmitted signal is sent (e.g., wire, air, optical fiber, free
space)

8. Distortion/Noise: External signals/features that affect the signal
Receiver: Modifies the received signal, undoing the modifications done by the transmitter
Output Transducer: Converts message from electrical signal back into its original form
Output Message: The message/data/info that has been communicated
Message Destination: Who/what the message/data/info was intended for
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9. Example System
1: FM Radio
2: Sending a Text Message