Show color television receiver, Electrical Engineering

Assignment Help:

A color television receiver is shown in Figure in block diagram form, indicating only the basic functions. The early part forms a straightforward superheterodyne receiver, except for the following changes:

• The frequency-tuning local oscillator is typically a push-button-controlled frequency synthesizer.

• IF circuitry in television is tuned to give a filter characteristic required in VSB modulation.

The filter shapes the IF signal spectrum so that envelope detection is possible. The output of the envelope detector contains the composite visual signal fc(t) and the frequency-modulated aural carrier at 4.5 MHz. The latter is processing in a frequency demodulator to recover the audio information for the loudspeaker. The former is sent through appropriate filters to separate out signals fY(t) and [fI(t) + fQ(t)], which is further processed by two synchronous detectors in quadrature to recover SI(t) and SQ(t).An appropriatematrix combines fY(t), SI(t), and SQ(t) to yield close approximations of the originally transmitted mR(t), mG(t), and mB(t). These three signals control the three electron beams in the picture tube.

The output of the envelope detector is also applied to circuits that separate the sync signals needed to lock in the horizontal and vertical sweep circuits of the receiver. The bursts of color carriers are isolated such that a PLL can lock to the phase of the color carrier, and thereby provide the reference signals for the chrominance synchronous detectors.

654_Show Color television receiver.png


Related Discussions:- Show color television receiver

Draw a diagram of ultrasonic machine, Draw a diagram of ultrasonic Machine ...

Draw a diagram of ultrasonic Machine and illustrate its important parts? Discuss the following important element of ultrasonic process. (i) Abrasive slurry. (ii) Work Mate

Actuators , Actuators These devices convert electromagnetic energy to...

Actuators These devices convert electromagnetic energy to mechanical energy to produce intermittent mechanical movement (e.g. opening a valve in a central heating system or c

Explain the block diagrtam of d.c. voltmeter , Q.   Explain the block diagr...

Q.   Explain the block diagrtam of D.C. voltmeter with direct coupled amplifier. Sol. D.C, voltmeter with direct coupled Amplifier         The D.C. electronic voltmeters

Solar steam power generator, This project is about another particular appli...

This project is about another particular application of a particular embodiment of the patent: A Long Stroke Steam Engine using Solar Generated Steam. The machine elements such as

Binary codes, what are the types of binary codes

what are the types of binary codes

Wireless and communication, With a maximum excess delay of and a chip durat...

With a maximum excess delay of and a chip duration of , the multipath components fall in delay bins. This means that we experience leakage of energy between chips and the channel i

Explain standby mode of operation in spc organization, Q. Explain Standby m...

Q. Explain Standby mode of operation in SPC organization? Standby mode of operation is the simplest of dual processor configuration operations. Generally one processor is activ

Not gate- introduction microprocessors , Normal 0 false fals...

Normal 0 false false false EN-IN X-NONE X-NONE

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