75 lines
3.7 KiB
Markdown
75 lines
3.7 KiB
Markdown
E2B Television practices: fast-scan television standards and techniques; slow scan television standards and techniques
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- [[E2B01]] (A)
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In digital television, what does a coding rate of 3/4 mean? #card
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- [[A.]] 25% of the data sent is forward error correction data
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- [[B.]] Data compression reduces data rate by 3/4
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- [[C.]] 1/4 of the time interval is used as a guard interval
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- [[D.]] Three, four-bit words are used to transmit each pixel
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- [[E2B02]] (C)
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How many horizontal lines make up a fast-scan (NTSC) television frame? #card
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- [[A.]] 30
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- [[B.]] 60
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- [[C.]] 525
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- [[D.]] 1080
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- [[E2B03]] (D)
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How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system? #card
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- [[A.]] By scanning two fields simultaneously
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- [[B.]] By scanning each field from bottom-to-top
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- [[C.]] By scanning lines from left-to-right in one field and right-to-left in the next
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- [[D.]] By scanning odd-numbered lines in one field and even-numbered lines in the next
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- [[E2B04]] (A)
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How is color information sent in analog SSTV? #card
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- [[A.]] Color lines are sent sequentially
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- [[B.]] Color information is sent on a 2.8 kHz subcarrier
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- [[C.]] Color is sent in a color burst at the end of each line
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- [[D.]] Color is amplitude modulated on the frequency modulated intensity signal
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- [[E2B05]] (C)
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Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions? #card
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- [[A.]] The vestigial sideband carries the audio information
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- [[B.]] The vestigial sideband contains chroma information
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- [[C.]] Vestigial sideband reduces the bandwidth while increasing the fidelity of low frequency video components
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- [[D.]] Vestigial sideband provides high frequency emphasis to sharpen the picture
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- [[E2B06]] (A)
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What is vestigial sideband modulation? #card
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- [[A.]] Amplitude modulation in which one complete sideband and a portion of the other are transmitted
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- [[B.]] A type of modulation in which one sideband is inverted
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- [[C.]] Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
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- [[D.]] Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation
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- [[E2B07]] (B)
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Which types of modulation are used for amateur television DVB-T signals? #card
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- [[A.]] FM and FSK
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- [[B.]] QAM and QPSK
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- [[C.]] AM and OOK
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- [[D.]] All these choices are correct
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- [[E2B08]] (A)
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What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70-centimeter band? #card
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- [[A.]] Transmitting on channels shared with cable TV
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- [[B.]] Using converted satellite TV dishes
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- [[C.]] Transmitting on the abandoned TV channel 2
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- [[D.]] Using USB and demodulating the signal with a computer sound card
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- [[E2B09]] (D)
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What kind of receiver can be used to receive and decode SSTV using the Digital Radio Mondiale (DRM) protocol? #card
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- [[A.]] CDMA
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- [[B.]] AREDN
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- [[C.]] AM
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- [[D.]] SSB
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- [[E2B10]] (A)
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What aspect of an analog slow-scan television signal encodes the brightness of the picture? #card
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- [[A.]] Tone frequency
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- [[B.]] Tone amplitude
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- [[C.]] Sync amplitude
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- [[D.]] Sync frequency
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- [[E2B11]] (B)
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What is the function of the vertical interval signaling (VIS) code sent as part of an SSTV transmission? #card
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- [[A.]] To lock the color burst oscillator in color SSTV images
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- [[B.]] To identify the SSTV mode being used
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- [[C.]] To provide vertical synchronization
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- [[D.]] To identify the call sign of the station transmitting
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- [[E2B12]] (A)
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What signals SSTV receiving software to begin a new picture line? #card
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- [[A.]] Specific tone frequencies
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- [[B.]] Elapsed time
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- [[C.]] Specific tone amplitudes
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- [[D.]] A two-tone signal
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