NEED OF MODULATION IN ANALOG COMMUNICATION IN 2020

NEED OF MODULATION IN ANALOG COMMUNICATION IN 2020

C0MMUNICATION  SYSTEM, BASE BAND AND BAND PASS SIGNALS, MODULATION

Introduction:

In this topic we will discuss about the communication system, baseband and bandpass signals, modulation and need of modulation. Mostly, we will discuss on the topic modulation.

Communication System:

Communication is simply basic process of exchanging information. The electronic equipment which are used for communication purpose are called communication equipment. The typical example of communication system are line telephoning, radio broadcasting, radio telephoning, point to point communication.

The Communication process:

Information source:

We know that a communication system servers to communicate a message or information. This information originate in the information source. In short the function of information required message which has to be transmitted.

Input transducer:

The input transducer convert the information to be transmitted to its electrical signals.

Transmitter:

The function of the transmitter is to process the electrical signal from different aspect.

Channel And Noise:

The term channel means the medium through which the message travel from the transmitter to the receiver. 2 Types of channel namely : point to point  And  broadcast.
Point to Point : Microwaves Links , Optical fibre , wirelines.
Broadcast : By Satellites.

Noise:

Noise is unwanted signals which tends to interface with the required signal.

Receiver:

The main function of receiver is to reproduce the message signal in electrical from the distorted received signal.

Output Transducer:

Output transducer covert electrical signal to a form message required by user.

Baseband Signal:

Ø  All source of information generate baseband signals.
Ø  Signals are transmitted without modulation.
Ø  It’s frequency start from zero.

Band Pass Signal:

Ø  Band Pass signal are generated by the modulators in transmitter.
Ø  Band Pass signals are transmitted after the modulation with carrier signal.
Ø  No limitations of bandwidth and frequency depends on the carrier frequency.

MODULATION:

In modulation process two signals are used namely the modulation signal and the carrier signal. The modulating signal is nothing but the baseband signal or information signal. While the carrier is the high frequency sinusoidal signal.
In the modulation process some parameters of the carrier is varied in accordance with the modulating signals.

NEED OF MODULATION:

Avoid mixing of signals:

If a base band sound signal are transmitted without modulation by different transmitter then all signals will occupy the same frequency range and therefore the receiver can not separate them for each other. Hence each sound signal is modulated using a different carrier and will occupy different slots in frequency domain.

Increase in range of communication:

As low frequency signals cannot travel along distance therefore after the modulation process the modulated high frequency signals can travel along distance and will increase the range of communication.

Reduction in height of antenna:

 For the transmission of radio signals, the antenna height must be multiple of λ/4 ,where λ is the wavelength . The antenna of this height is practically impossible to install . ... Thus, modulation reduces the height of the antenna .

 Conclusion:

Here we discussed about the communication system, modulation and need of modulation. mostly we covered the basic of analog communication system.

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