This set of Audio Video Engineering Multiple Choice Questions & Answers (MCQs) focuses on “High Definition Television (HDTV)”.
1. Who is the worldwide leader in HDTV for many years?
a) NHK
b) FFK
c) FCI
d) SDK
View Answer
Explanation: The worldwide leader in HDTV for many years now has been NHK, the Japan Broadcasting Corporation in Tokyo. The standards adopted include 1125 scanning lines per frame along with 60 fields per second and also a 2:1 interlace scan and an aspect ratio of 16:9. The 1125 lines were chosen to get an approximate doubling of vertical resolution.
2. Which country started its own project of HDTV in the year 1986 named ‘EUREKA’?
a) India
b) Japan
c) Europe
d) China
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Explanation: Europe started its own project of HDTV in June 1986 named ‘EUREKA’, a cooperative venture of 32 countries of that region. The Eureka system is designed to be compatible with C.C.I.R. standards but with line numbers equal to 1249 and an aspect ratio of 16:9.
3. Which of the following is the HDTV bandwidth compression scheme developed by NHK?
a) MAC
b) MUSE
c) CCU
d) STN
View Answer
Explanation: Multiple sub-Nyquist Sampling Encoding (MUSE) is an HDTV bandwidth compression scheme developed by NHK. The MUSE system developed by NHK was of 1125 lines, interlaced, 60 Hz system with a 5/3 aspect ratio and an optimal viewing distance of roughly 3.3H.
4. What is the cross over frequency at which higher video frequencies are emphasized prior to modulation at the transmitter and de-emphasized at the receiver in NHK broadcast?
a) 5.2 MHz for Y, 1.6 MHz for C
b) 6.2 MHz for Y, 3.6 MHz for C
c) 9.5 MHz for Y, 6.6 MHz for C
d) 7.5 MHz for Y, 0.3 MHz for C
View Answer
Explanation: If the higher video frequencies are emphasized prior to modulation at the transmitter and de-emphasized at the receiver in NHK broadcast, lack of visual response to low frequency noise allows significant reduction in transponder power. This method was adopted, with crossover frequencies for the emphasis/de-emphasis at 5.2 MHz for Y at 1.6 MHz for C. With this, the power requirements drop to 260 W of power.
5. Analog compression is used to fit the combination of Y/C signal into the 8.15 satellite bandwidth in HDTV.
a) True
b) False
View Answer
Explanation: The above statement is false. The problem of fitting the combination of Y/C signal into 8.15 MHz satellite bandwidth was solved by digital compression. The NHK HDTV signal is initially sampled digitally at 48.6 Ms/s. This signal controls two filters, one responsive to stationary parts of image and one responsive to moving parts.
Sanfoundry Global Education & Learning Series – Audio Video Engineering.
To practice all areas of Audio Video Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.
