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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.
Q. Explain working of three-phase transformers? Transformation in three-phase systems can be accomplished in either of two ways: (1) connecting three identical single-phase tra
NIS Sound Systems, Inc. produces and sells sound systems for both home and auto. DVD players used in the assembly of NIS systems are purchased from BUN Electronics. NIS purchasing
Limitations of maximum power transfer theorem
What is resistivity? Resistivity of a material may be explained as the resistance of the material having unit length and also unit cross sectional area. Unit of it is ohm-m.
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Q. What do you mean by Feedback in amplification? Feedback : Feedback in its broadest sense means that a certain amount of the output signal is "fed back" into the input. An
subranging ADC is a modification
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Describe in brief the Formation of energy bands in solids and hence explain how it helps to classify the solid in to conductors and insulators. Energy Bands in Solids Acco
Show that the infiltration volume estimated using Horton's infiltration equation between times t1 and t2 is given by; F =f c (t 2 -t 1 )+(f 1 -f c )(1-e -k(t2-t1) )/k Use the
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