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

Operation of mosfet, Operation of MOSFET The operation of a metal-oxi...

Operation of MOSFET The operation of a metal-oxide-semiconductor field-effect transistor which is abbreviated as MOSFET can be separated into three modes, depending upon the

Working of spectrum analyzer and its applications, Q.  Explain the working...

Q.  Explain the working of spectrum analyzer and its applications. OR Draw block diagram of spectrum analyzer and explain its operation write down its importance applica

Averaged power dissipated in the load, (a) Consider the following transmiss...

(a) Consider the following transmission line with the reactance X1 placed across the input. It is being driven with a frequency ω such that the length of the line is λ/4. What v

Sign flag - sub subtract instruction , Sign flag Since D 7  bit in ...

Sign flag Since D 7  bit in the  results is 0sign flag is reset. This also  shown that the results is positive.

Common base configuration - bjt, Common base configuration: for pap t...

Common base configuration: for pap transistor connection for common base operation is as follow: common base means base is common to both input and output side of configurati

Why ce configuration is widely used in amplifier circuit, Q . Why CE Config...

Q . Why CE Configuration is widely used in amplifier circuit? The main utility of a transistor lies in its ability to amplify weak signals. The transistor alone cannot perform

Explain n - type semiconductor, Explain n - Type semiconductor. n - ...

Explain n - Type semiconductor. n - Type semiconductor:- (i) If small amount of pentavalent impurity is added with, to a pure semiconductor giving a large number of free

Measurment, emitter followers regulator

emitter followers regulator

Measure phase angle by using an oscilloscope, 1. Introduction : ...

1. Introduction : Theory:  Phase angle is defined as the number of degrees separating two sine waves of the same frequency. The Phase shift is defined as any change t

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