This document discusses the basic components of an electronic communication system. It explains that an information signal from the source is converted to an electrical signal by a transducer. A transmitter then modulates a high frequency carrier wave with the information signal and sends it through a channel, such as a cable or wireless medium, where it can encounter noise. At the receiver, a demodulator recovers the original signal which is then converted back to its original form by an output transducer and delivered to the destination. The key components that enable electronic communication are the source, transmitter, channel, receiver and destination between which the information signal is converted, modulated, transmitted, demodulated and converted back for delivery.

1. n
1. Introduction to Electronic
Communication.
By
Aparna Lal
Assistant Professor
Christ College, Pune
© 2020 APARNA LAL

2. © 2020 APARNA LAL

3. Information Source
Information Signal is basically low frequency signal which is to be transmitted from source to destination.
Information signal is also called as Modulating Signal or Baseband signal
Eg. Voice Signal of human, Video signal or picture or text.
This signals are usually low frequency and low amplitude signals.
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4. Two types of signal in
electronics ?
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5. Analog Digital
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6. Information signal can be in any form
Eg: Speech
Pictures
Videos
Words
Codes
Symbols
Commands
Data
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7. Transducers/
Sensors
Why do we
need it ?
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8. Transducers
Converts
information signal or
modulation signal
into Electrical signal© 2020 APARNA LAL

9. Transmitter
What it does ?
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10. Transmitter
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11. Transmitter
It has to transmit the information. It consist of:
1. Modulator : It modifies the characteristics of some high frequency wave with instantaneous value of other signal called as
information or modulating signal . Modulation Circuits like AM, FM, PM is used. Modulation is used to transmit signal
over 100 km and more. Else we use Base Band.
2. Amplifier: To increase strength of signal.
3. Frequency Filter : To remove unwanted signal
4. Antenna : It is used to transfer signal in form of electromagnetic wave.
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12. Channel
What it does ?
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13. Channel
Medium through which signal goes from transmitter to receiver. It can be:
1. Metallic cable made by Copper or Aluminium
2. Free Space
3. Fiber Optics Cable
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14. Noise
Its unwanted electric signal
Mostly enters through communication channel
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15. Receiver
What components will receiver have ?
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16. Receiver
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17. Receiver
It receives the information and passes to transducer. It picks up the
desired signal from the channel and pass it. It consist of:
1. Antenna :here antenna receives the signal i.e. electromagnetic wave
and transfers it in the form of electrical
2. Frequency Filter : To remove unwanted signal
3. Amplifier: To increase strength of signal.
4. Demodulator : It accepts a modulated signal and recovers the original
modulating signal.
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18. Output
Transducers
It converts the electric signal in to
original information
Eg. 1. Loudspeaker converts audio
information into sound waves.
2. CTR tube in TV converts video
signal in to Image Picture
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19. Destination
The location where the original information is collected .
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20. Source
1. Generated by human in
form of sound waves
2. For electrical
communication it needs to be
converted into suitable form.
Transmitter
1.It transmits the information. If the
information is electrical in nature it becomes
easy for processing and sending
2.If it is in the form of sound waves, it is
necessary to convert it into electrical
variations. The device that converts one
form of energy into another is known as
sensors.
Channel
1. It is the medium of passing
any signal from one device to
another. It may be pair of
wires, nowadays fiber optics
cable or light wires are used.
2. The medium between
transmitter and receiver may
be wireless such as in mobile
telephony, radio and television
communication.
Transducers
Converts information
signal or modulation
signal into Electrical
signal
Noise
1. It is the undesirable electric energy that enters
the communication system via communication
medium and interferes with the transmitted
message.
2. Some noises as also created internally, inside
the circuit.
3. Natural phenomenon also causes noise.
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21. Output transducers
It converts the electric signal
in to original information
Receiver
1. Picks up the signal from the
channel and pass it to the
destination.
2. Receiver is mostly
associated with demodulator
Destination
1. Where we receive
our output in form
of original signal.
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