12. _____ is a wide-screen aspect ratio similar to that
found in common movie theaters.
13. The Moving Picture Experts Group developed the
_____ image compression standard to increase
the amount of video data transmitted in an HDTV
system.
14. _____ percent of a typical transmitted picture does
not change from picture frame to picture frame.
15. The most common active-matrix display is the
_____ - _____.
Matching Questions
Match the following terms with their correct
definitions.
a. Sync separator.
b. Sync amplifier.
c. Mixer.
d. Vertical oscillator.
e. Video amplifier.
f. Horizontal AFC.
16. The output of this device provides the sawtooth
voltage to the deflection coils.
17. Removes the horizontal and vertical sync pulses
transmitted as part of the composite video signal.
18. Compares the frequencies of the horizontal oscilla-
tor and sync pulse.
19. Amplifies the demodulated picture signal and feeds
it to the grid of the CRT.
20. Combines the incoming video signal with a local
oscillator signal.
21. A voltage amplifier stage in which the sync pulse is
increased.
For Discussion
1. Discuss the function of each of the following con-
trols found in a TV receiver. State the circuit that is
regulated by each control.
a. Horizontal hold.
b. Brightness.
c. Vertical hold.
d. Fine-tuning.
e. Channel selector.
f. Vertical linearity.
g. Horizontal linearity.
h. Height control.
i. Contrast.
j. Width control.
2. Explain the process of negative transmission used
in television in the United States.
3. How does the vertical integration network separate
the vertical sync pulse?
4. If dc amplifiers were used in the video section,
would dc restoration be necessary?
5. Why are both UHF and VHF channels needed for
television?
6. Research and discuss the various types of video
display.
7. Discuss what you think television will be like in the
year 2020.
8. How did development of the shadow mask picture
tube promote the reality of color TV?
9. Why would a digital television image be sharper
than a conventional television image?
420 Electronic Communication and Data Systems