Explain source encoding or data compression, Electrical Engineering

Assignment Help:

Q. Explain Source encoding or data compression?

The sequence of binary digits from the source encoder, known as the information sequence, is passed on to the channel encoder. The purpose of the channel encoder is to introduce some redundancy in a controlled manner in the binary information sequence, so that the redundancy can be used at the receiver to overcome the effects of noise and interference encountered in the transmission of the signal through the channel. Thus, redundancy in the information sequence helps the receiver in decoding the desired information sequence, thereby increasing the reliability of the received data and improving the fidelity of the received signal.

The binary sequence at the output of the channel encoder is passed on to the digitalmodulator, which functions as the interface to the communication channel. The primary purpose of the digital modulator is to map the binary information sequence into signal waveforms, since nearly all the communication channels used in practice are capable of transmitting electric signals (waveforms). Because themessage has only two amplitudes in a binary system, themodulation process is known as keying. In amplitude-shift keying (ASK), a carrier's amplitude is shifted or keyed between two levels. Phase-shift keying (PSK) involves keying between two phase angles of the carrier,whereas frequency-shift keying (FSK) consists of shifting a carrier's frequency between two values.Many other forms of modulation are also possible.


Related Discussions:- Explain source encoding or data compression

Discuss important properties and uses of ceramics, Discuss important proper...

Discuss important properties and uses of Ceramics. Ceramics - These are materials made by high temperature firing treatment of natural clay and specific inorganic matters. The

What are the different types of patrolling, Q. What are the different types...

Q. What are the different types of Patrolling? When these are adopted? What are points to be considered while preparing the charts? Ans.- Types of Patrolling. 1. Keyman's

What do you mean by heat sink?, Q. What is a heat sink? List the factors, w...

Q. What is a heat sink? List the factors, which determine its efficiency. To reduce the chance of thermal runaway, the rise of temperature at the collector junction to a danger

Supernode, how does creating a supernode helps solve the problems?

how does creating a supernode helps solve the problems?

Segment assembler directive, What do you understand by SEGMENT assemble...

What do you understand by SEGMENT assembler directive? SEGMENT: This directive explains to the assembler the start of a segment along with name segment-name. The segment

Explain the operation of 8279, Explain the operation of 8279.  Explain the ...

Explain the operation of 8279.  Explain the following terms: (i)  N key Roll over. (ii)  Key board debounce. (iii)  FIFO RAM. Ans The 8279 microprocessor i

Develop the equivalent circuits, (a) contains a freewheeling diode Dm, comm...

(a) contains a freewheeling diode Dm, commonly connected across an inductive load to provide a path for the current in the inductive load when the switch S is opened after time t (

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd