This set of Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Digital TV Receiver”.
1. Digital television is not superior to analog television.
a) True
b) False
View Answer
Explanation: A digital television is superior to analog because of its greater accuracy, versatility, efficiency and interoperability with other electronic media. Digital televisions also have the advantage of generating no noise or “ghosting”, and being more resistant to signal interference. Digital TV has several other advantages over traditional analog television including sharper DVD quality widescreen pictures and CD quality Digital Stereo sound.
2. Which of the following is the main block of digital TV receiver?
a) MCU (Microcontroller unit)
b) MPRT(Motion picture response time)
c) CCU (central control unit)
d) MTR (Mean time to repair)
View Answer
Explanation: The main block of the system is the Central Control Unit (CCU), a micro-computer based device that controls and coordinates all the circuits and signal processing functions and provides a user interface. This permits the user to control receiver functions, display teletex and obtain multiple picture-in-picture displays for simultaneous viewing of different programs and even zooming of the picture.
3. What separates the signal into two signals called chrominance and luminance in digital TV receiver?
a) Video processor
b) Video codec
c) Audio codec
d) Audio processor
View Answer
Explanation: Video processor separates the signal into two signals-luminance and chrominance. The luminance signal after processing passes through a multiplayer which sets the brightness and contrast of the picture in accordance with the user’s settings. The chrominance signal which encodes corresponding weightage of the RGB consists of a band pass filter, an automatic color circuit, a comb filter and color decoder.
4. Which of the following receives the standard TV signal and synchronizes the vertical and horizontal sweep generators using the color subcarrier in digital TV receiver?
a) Audio processor
b) Video processor
c) Deflection processing unit
d) Audio codec
View Answer
Explanation: The deflection processor chip in the digital TV receiver receives the standard TV signal and synchronizes the vertical and horizontal sweep generators using the color subcarrier. The sweep output after amplification in horizontal output amplifier and vertical output amplifier are applied to the corresponding (H and V) deflection yokes.
5. The audio codec is also an ADC (Analog to Digital convertor) that converts the input signal into a 32 bit resolution stream at 35 KHz in digital TV receiver.
a) True
b) False
View Answer
Explanation: The audio codec is also an ADC that converts the input signal into a 16 bit resolution stream at 35 KHz. Digital identification filter takes out identification signal and identify whether the broadcast is mono, stereo or bilingual. A parallel to series converter makes the signal into one stream output which is made input to the audio processor.
6. Which of the following receives the signal from parallel to serial convertor and splits it in to two channels of audio the left and the right in digital TV receiver?
a) Audio codec
b) Audio processor
c) Video processor
d) Video codec
View Answer
Explanation: The audio processor receives the signal from parallel to serial convertor and splits it in to two channels of audio the left and the right. It then sends each signal through a series of filters that can control loudness, stereo balance, bass, treble and other necessary functions. The coefficients of filters are controlled by signals from the CCU (Central Control Unit) and are based on user’s settings.
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