Explain sampling and pulse modulation, Electrical Engineering

Assignment Help:

Q. Explain Sampling and Pulse Modulation?

In most analog circuits, signals are processed in their entirety. However, in many modern electric systems, especially those that convert waveforms for processing by digital circuits, such as digital computers, only sample values of signals are utilized for processing. Sampling makes it possible to convert an analog signal to discrete form, thereby permitting the use of discrete processing methods. Also, it is possible to sample an electric signal, transmit only the sample values, and use them to interpolate or reconstruct the entire waveform at the destination. Sampling of signals and signal reconstruction from samples have widespread applications in communications and signal processing.

1759_Explain Sampling and Pulse Modulation.png

One of the most important results in the analysis of signals is the sampling theorem, which is formally presented later. Many modern signal-processing techniques and the whole family of digital communication methods are based on the validity of this theorem and the insight it provides. The idea leading to the sampling theorem is rather simple and quite intuitive. Let us consider a relatively smooth signal x1(t), which varies slowly and has its main frequency content at low frequencies, as well as a rapidly changing signal x2(t) due to the presence of high-frequency components. Suppose we are to approximate these signals with samples taken at regular intervals, so that linear interpolation of the sampled values can be used to obtain an approximation of the original signals. It is obvious that the sampling interval for the signal x1(t) can be much larger than the sampling interval necessary to reconstruct signal x2(t) with comparable distortion. This is simply a direct consequence of the smoothness of the signal x1(t) compared to x2(t). Therefore, the sampling interval for the signals of smaller bandwidths can be made larger, or the sampling frequency can be made smaller. The sampling theorem is, in fact, a statement of this intuitive reasoning.


Related Discussions:- Explain sampling and pulse modulation

Determine whether the diode in circuit, Determine whether the diode (consid...

Determine whether the diode (considered to be ideal) in the circuit of Figure (a) is conducting.

Physical operation of the junction of diode, Q. Physical operation of the j...

Q. Physical operation of the junction of diode? The physical operation of the junction can be described in terms of the charge-flow processes. Usually there is a greater concen

Nand gate - introduction to microprocessors , NAND Gate NAND   means NO...

NAND Gate NAND   means NOT AND  it complements  the output  of an AND  gate. The symbol  of NAND  by a NOT  gate.  Generally Not  operation  is represented by a bubble as shown

DC generator, define all the symbols with their units of DC generater

define all the symbols with their units of DC generater

Transformer, how back emf is produced in transformer?

how back emf is produced in transformer?

What is meant by daisy chaining method, What is meant by Daisy Chaining met...

What is meant by Daisy Chaining method?  It does not need any priority resolving network, rather the priorities of all the devices are effectively assumed to be in sequence.

Determine the speed of the motor, Q. A 10-kW, 250-V dc shunt generator, hav...

Q. A 10-kW, 250-V dc shunt generator, having an armature resistance of 0.1and a field resistance of 250 , delivers full load at rated voltage and 800 r/min. The machine is now ru

Use of speaker, Q. Use of Speaker? Speaker:Basically speaker is the rec...

Q. Use of Speaker? Speaker:Basically speaker is the receiver for telephone. Speaker converts electrical signals received from local loop to acoustical signals(sound waves) that

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