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

Describe operation performed by instruction OUT47 h, Describe the operation...

Describe the operation performed by the instruction OUT 47 h, AL. This transfers the content of AL to I/O port 47h. See that I/O port number shows as 0047h on the 16 bit addres

Reverse bias, Reverse bias Reverse biased generally refers to how a di...

Reverse bias Reverse biased generally refers to how a diode is employed in a circuit. If a diode is reverse biased, the voltage at the cathode is gets higher than that at the

Working of an astable multivibrator, Q. With the help of a npn transistor c...

Q. With the help of a npn transistor circuit and wave forms explain the working of an astable multivibrator In astable multivibrator both transistors are coupled to each other

Delay line in CRO, why we use delay line in CRO what happens if we not use ...

why we use delay line in CRO what happens if we not use it?

How oscillations start up in an oscillator, Q. How oscillations start up in...

Q. How oscillations start up in an oscillator?  The noise voltage produced due to the random motion of electrons in resistors or in active devices provides the starting voltage

Explain ferrimagnetic magnetic materials, Explain Ferrimagnetic magnetic ma...

Explain Ferrimagnetic magnetic materials. Ferrimagnetic Materials: In such materials unequal magnetic dipoles are lined up anti-parallel to each other. And permeabilities are

Electonic principles, can you help with my electronic principle assignment

can you help with my electronic principle assignment

., ABOUT ASSIGNMENT ON MAGNETIC INDUCTION NEAR A LONG WIRE

ABOUT ASSIGNMENT ON MAGNETIC INDUCTION NEAR A LONG WIRE

Power semiconductor devices , Normal 0 false false false ...

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

What do you mean by bezier curve, What do you mean by Bezier curve? Shown B...

What do you mean by Bezier curve? Shown B0 (1,1), B1 (2,3), B2 (4,3), B3 (3,1) the vertices of Bezier polygon, calculate seven points on Bezier curve. Write in brief the differe

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