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

Design a matching network of balanced stubs, A certain cellular telephone a...

A certain cellular telephone antenna has an input impedance at f=1.0 GHz modeled by a shunt R-C combination, with R=200Ω and C=2.0pF. Because of manufacturing restrictions, you can

Thyristor terminology , Thyristor  Terminology The followings  terms ...

Thyristor  Terminology The followings  terms are used in SCR  specifications: Latching current : The  latching  current is  the value of on stat e current  required  to mai

Determine the fourier series for the periodic wave - forms, Q. Determine th...

Q. Determine the Fourier series for the periodic wave - forms given in Figure.

Matlab program for niquit, how to write a matlab program for TITO system to...

how to write a matlab program for TITO system to draw nyquit plots.

Uses of zener diode, Uses of Zener Diode Zener diodes are extensively...

Uses of Zener Diode Zener diodes are extensively used as voltage references and like shunt regulators to regulate the voltage across small circuits. While connected in parall

moving average model, Altavox is a manufacturer and distributor of a lot o...

Altavox is a manufacturer and distributor of a lot of electronic instruments and devices, including digital/analog multimeters, function generators, oscilloscopes, frequency counte

Digital control system, block diagram of digital control system and explain...

block diagram of digital control system and explain each block

What are the duties of sub-station operator, What are the Basic Duties of S...

What are the Basic Duties of Sub-Station Operator? Ans: Sub station operator is responsible for safe and proper operation of all electrical equipments in sub-station. He co

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