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

Electrical Safety Management, What will this voltmeter register when connec...

What will this voltmeter register when connected to a battery as shown(assume a battery voltage of 6 volt)?

Neutral line in transformer, thus secondary winding of transformer consists...

thus secondary winding of transformer consists of neutral line or not?

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

Explain ionic polarization, Explain i onic polarization. Ionic polari...

Explain i onic polarization. Ionic polarization is polarization that is caused by relative displacements between negative and positive ions in ionic crystals (for illustrati

Ujt as relaxation oscillator, UJT as relaxation oscillator: The UJT re...

UJT as relaxation oscillator: The UJT relaxation oscillator is shown in fig. it consist of a UJT and a capacitor C which is charged through a variable resistance R when VBB is

Analog & Digital Filtering, 1) Assume that we are given the continuous-time...

1) Assume that we are given the continuous-time signal xa (t) = xa1 (t) + xa2 (t) + xa3 (t), where, xa1 (t) = 2 + cos3 (2pf1 t + p 3 ) + 2 cos(2pf2 t), xa2 (t) = 2 cos(2pf3 t)

Single phase full wave controlled rectifier , Single Phase Full Wave Contro...

Single Phase Full Wave Controlled rectifier The single  phase  half  wave controlled  rectifier  produce only one pulse  of load  current  during  one cycle  of supply voltage

Working of bootstrap sweep circuit, analysis and detail working of bootstra...

analysis and detail working of bootstrap sweep circuit

Bode plot phase ad gain margin, Using Bode plot calculate (a) Phase margin ...

Using Bode plot calculate (a) Phase margin (b) Gain margin (c) Stability of closed loop system. The open transfer function of the system is t=30/(s+2)/(s+3)Using Bode plot calcula

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