1. A single transmission path from transmitter to receiver. Hop 2. The signal-to-noise ratio in a receiver at a point before the
detector. Carrier-to-noise Ratio
3. The deviation of a wave as it passes an obstacle or passes
through a small aperture. Diffraction 4. It is the use of more than one frequency or transmission
path to improve system reliability in the presence of fading. Diversity 5. It is the energy received in the time taken to transmit one
bit. Energy per Bit
6. Variation in received field strength over time due to
changes in propagation conditions. Fading 7. A region near an object in which diffraction effects are
significant. Fresnel Zone
8. It is the abrupt variations in the timing of a digital signal. Jitter 9. It is a network using microwaves for two-way transmission
for telephony, television, and high-speed data.
Local Multipoint Distribution System (LMDS)
10. This is a terrestrial microwave system for the distribution of television, Internet, and telephone services to businesses and residences.
Multichannel Multipoint Distribution System (MMDS) 11. A receiver-transmitter combination that amplifies and
transmits a signal. Repeater
12. A map showing surface features, including the elevation of
the terrain. Topographic Map
13. Terrestrial microwave links generally use ______________
propagation. Line-of Sight (LOS)
Attenuation due to rain, Ducting,
Aging or partial failure 15. Fading due to multipath reception can reduce the received
signal strength by ______ or more. 20dB 16. This technique is done by slightly changing the frequency
so that the phase difference between the direct and reflected signals is no longer 180°.
Frequency Diversity
17. To protect against fading on a moment-to-moment basis, frequency diversity requires two transmitters and two receivers, better known as a _____.
Hot Standby
18. This technique is done by placing two antennas one above
and the other on the same tower. Space Diversity 19. Two systems of terrestrial microwave links. Analog,
Digital 20. Analog system is also called ______ or _______. AM System,
FM System 21. Digital system is also called _______. QAM System 22. Digital data can also be transmitted with FM systems using
______ ______. External Modems
CHAPTER 19: TELEVISION
1. Ratio of the width to the height of a television picture. Aspect Ratio 2. The portion of the horizontal blanking pulse after the synch
pulse. Bach Porch
3. The video level corresponding to zero luminance. Black Setup 4. The period of time when the electron beam in a CRT is cut-
off. Blanking
5. A vacuum tube that uses a moving electron beam to
produce patterns or images on a photophorescent screen. Cathode-ray Tube (CRT) 6. The color signal. Chrominance (Chroma) 7. These are several cycles of color subcarrier on the back
porch of the horizontal sync for color synchronization. Color Bursts 8. A filter that can pass or reject a fundamental frequency and Comb Filter
its harmonics.
9. A video system in which color and luminance are sent
separately, without frequency interleaving. Component Color 10. A video system in which luma, sync, and chroma signals
are combined. Composite Video
11. Alignment of the three electron beams in a color CRT so
that they land on the same triad of color phosphor dots. Convergence 12. the pulses in the vertical blanking interval of a video signal
that create interlaced scan. Equalizing Pulses 13. In an interlaced video system, it is one-half of a frame
consisting of alternate lines. Field 14. One complete image in a video system is called ________. Frame 15. The portion of horizontal blanking pulse before the sync
pulse. Front Porch
16. A television receiver design that uses mixing between the picture and sound carriers to generate the sound
intermediate frequency.
Intercarrier Sound
17. A video scanning system that divides a frame into two
fields to reduce flicker. Interlace 18. The signal that provides brightness information in a video
system. Luminance (Luma)
19. A North American television standard. NTSC Video 20. The video signal level representing maximum luminance. Peak White
21. Picture element. Pixel
22. A video system that does not use interlace. Progressive Scan 23. In a color CRT, it is the adjustment of the three electron
beams so that each lands on phosphor dots of the appropriate color.
Purity
24. The pattern of scanning lines in a video system. Raster 25. The amount of detail produced by a video system. Resolution 26. The return of the electron beam in a CRT from right to left
or from top to bottom. Retrace
27. A color video system in which the three primary colors are
transmitted separately. RGB Color 28. The main accelerating element in a CRT. Ultor
be used in determining vertical resolution.
30. A specialized oscilloscope designed for the observation of
composite color signals. Vectorscope 31. The assembly that contains the deflection coils and is
mounted on the neck of a CRT. Yoke 32. The North American NTSC television system transmits ___
frames per second. 30
33. Each frame transmitted by NTSC consists of _______ lines. 525 34. The NTSC uses a _______ interlace so that ______ fields
are transmitted per second.
2:1, 60 35. Composite color video uses two color signals modulated on
a subcarrier at 3.58 MHz using _________ ________. DSBSC QUAM 36. Terrestrial television broadcasting uses a channel _______
wide. 6 MHz
37. The picture in terrestrial television broadcasting is
transmitted using _______ with carrier. VSB AM 38. The sound in the terrestrial television broadcasting uses
___ on separate carrier to the video. FM 39. Picture and sound travel together through the _____ and
___ ______ of a television receiver.
Tuner,
Picture IF Sections 40. The sound is converted to a separate 4.5 MHz IF, in a
system known as __________ _________. Intercarrier Sound 41. Color receivers use _______ _________ to retrieve the
color signal. Synchronous Demodulation 42. The frequency and phase reference for the color
demodulators are provided by a ________ _______ on the back porch of the horizontal synchronizing signal.
Color Burst
43. The CRTs used in television receivers generate an
________ ______ that is intensity-modulated by the video signal and deflected horizontally and vertically by coils that surround the tube.
Electron Beam
44. Color CRTs use three electron beams striking three different types of phosphors that glow ____, ____, and ______.
Red, Green,
Blue
45. It reduce losses by moving UHF signals to the VHF range. Cable-television System 46. It is a technique used for reducing flicker on frame rates of Interlaced Scan
25 or 30 Hz..
47. Two time intervals. Horizontal Blanking Interval, Vertical Blanking Interval 48. The three primary colors that are mixed to achieve good
color reproduction.
Red, Green,
Blue
49. Two other standards of color television.
Phase Alteration By Line (PAL), Sequential Color and Memory
(SECAM) 50. The television stereo sound system is called ___________
_____ _________. Multichannel Television Sound
51. The first CRT. Monochrome CRT
52. In order to reproduce the three primary colors of the color television system, a color CRT must have _______ electron beams.
Three (3)