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

What are transmission bridges, Q. What are transmission bridges? How do the...

Q. What are transmission bridges? How do they assist in satisfying the connectivity?  Ans: A typical transmission bridge is demonstrated in figure. Series capacitance and shunt

Permanent magnets are made of which type of material, Permanent magnets are...

Permanent magnets are made of (A)  Soft magnetic materials.            (B) Hard magnetic materials. (C) Semi conductors.                        (D)  Super conductors.

Magnetic contactor, how to wire a three phase contactor to become a single ...

how to wire a three phase contactor to become a single phase contactor?

Ohm, what is ohm?

what is ohm?

Example of high resistivity material, Example of high resistivity material ...

Example of high resistivity material is (A) Nichrome              (B) Silver (C) Gold                      (D) Copper Ans: Nichrome is example of high resistivity

Hysteresis results in a dissipation of energy, Hysteresis results in a diss...

Hysteresis results in a dissipation of energy Hysteresis results in a dissipation of energy which appears as a heating of the magnetic material. The energy loss associated wit

Define amplification factor and drain resistance, Q. Define amplification f...

Q. Define amplification factor, drain resistance and transconductance and derive the relationship between drain resistance and trans conductance? Drain resistance It is the

Voltage tripler and quadrupler, Voltage Tripler and Quadrupler: Voltag...

Voltage Tripler and Quadrupler: Voltage Tripler an extension of the half wave voltage across each diode is 2Vm as it is for the filter capacitor circuit. It should be obvious

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