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Questions and Answers
What is the purpose of adding FEC to the bit stream in satellite broadcasting?
What is the purpose of adding FEC to the bit stream in satellite broadcasting?
What is the location of EchoStar's uplink facilities for its DISH network?
What is the location of EchoStar's uplink facilities for its DISH network?
What is the format of digital television that includes HDTV, as shown in Table 16.1?
What is the format of digital television that includes HDTV, as shown in Table 16.1?
By when were all analog TV transmissions in the U.S. scheduled to shut down?
By when were all analog TV transmissions in the U.S. scheduled to shut down?
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What is the purpose of time division multiplexing in satellite broadcasting?
What is the purpose of time division multiplexing in satellite broadcasting?
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Which company had its uplink facilities located in Oxford, Connecticut, as of 1996?
Which company had its uplink facilities located in Oxford, Connecticut, as of 1996?
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What is the purpose of a set-top box in HDTV broadcasting?
What is the purpose of a set-top box in HDTV broadcasting?
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What is the type of modulation used to modulate the carrier wave in satellite broadcasting?
What is the type of modulation used to modulate the carrier wave in satellite broadcasting?
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What is the format of digital television that includes HDTV, as shown in Table 16.1, developed by?
What is the format of digital television that includes HDTV, as shown in Table 16.1, developed by?
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Which company had its uplink facilities located in Castle Rock, Colorado, as of 1996?
Which company had its uplink facilities located in Castle Rock, Colorado, as of 1996?
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Study Notes
Direct Broadcast Satellite (DBS) Television
- DBS provides broadcast transmissions to a large area of the earth using antenna footprints
- DBS services include audio, television, and Internet services
- Direct broadcast television is digital TV, which is the subject of this chapter
History of DBS
- The concept of using satellites for direct transmissions into the home has been around for many years
- A comprehensive overview of DBS in Europe, the United States, and other countries can be found in Prichard and Ogata (1990)
Orbital Spacing
- The orbital spacing for high-power satellites is 9°, which eliminates adjacent satellite interference
- The DBS orbital positions and transponder allocations for the United States are shown in Fig. 16.1
DBS Orbital Positions
- Clusters of satellites occupy the nominal orbital positions
- Examples of satellites located at 119°W longitude include EchoStar VI, EchoStar IV, EchoStar II, and EchoStar I
Signal Processing
- Data signals and audio broadcast material are converted to a uniform digital format, compressed, and time division multiplexed
- The program guide and conditional access are added to the multiplexed stream
- FEC is added to the bit stream, which is then used to QPSK modulate the carrier for a given transponder
Uplink Facilities
- Uplink facilities are concentrated at single locations specific to each broadcast company
- The uplink facilities for Echostar's DISH network are shown in Fig. 16.9
- The four uplink facilities in operation as of 1996 are shown in Table 16.3
High Definition Television (HDTV)
- The 18 advanced television systems committee (ATSC) formats for digital television include HDTV
- Analog TV transmissions in the U.S. are scheduled to shut down by January 1, 2009
- Set-top boxes can convert HDTV signals to a format suitable for analog sets, but the high resolution and other advantages of digital TV will be lost in this process
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Description
This quiz covers the basics of direct broadcast satellite television, including its introduction and how satellites provide broadcast transmissions. Learn about the concept of direct transmissions into the home.
