2016-E2B: Television practices: fast scan television standards and techniques; slow scan television standards and techniques
How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?
How many horizontal lines make up a fast-scan (NTSC) television frame?
How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?
By scanning odd numbered lines in one field and even numbered lines in the next
By scanning two fields simultaneously
By scanning each field from bottom to top
By scanning lines from left to right in one field and right to left in the next
What is blanking in a video signal?
Turning off the scanning beam while it is traveling from right to left or from bottom to top
Synchronization of the horizontal and vertical sync pulses
Turning off the scanning beam at the conclusion of a transmission
Transmitting a black and white test pattern
Which of the following is an advantage of using vestigial sideband for standard fast-scan TV transmissions?
Vestigial sideband reduces bandwidth while allowing for simple video detector circuitry
The vestigial sideband carries the audio information
The vestigial sideband contains chroma information
Vestigial sideband provides high frequency emphasis to sharpen the picture
What is vestigial sideband modulation?
Amplitude modulation in which one complete sideband and a portion of the other are transmitted
A type of modulation in which one sideband is inverted
Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation
What is the name of the signal component that carries color information in NTSC video?
Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?
All of these choices are correct
A separate VHF or UHF audio link
Frequency modulation of the video carrier
What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?
No other hardware is needed
A special IF converter
A special front end limiter
A special notch filter to remove synchronization pulses
Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?
What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission?
To identify the SSTV mode being used
To lock the color burst oscillator in color SSTV images
To provide vertical synchronization
To identify the call sign of the station transmitting
How are analog SSTV images typically transmitted on the HF bands?
Varying tone frequencies representing the video are transmitted using single sideband
Video is converted to equivalent Baudot representation
Video is converted to equivalent ASCII representation
Varying tone frequencies representing the video are transmitted using PSK
How many lines are commonly used in each frame of an amateur slow-scan color television picture?
128 or 256
30 or 60
60 or 100
180 or 360
What aspect of an amateur slow-scan television signal encodes the brightness of the picture?
What signals SSTV receiving equipment to begin a new picture line?
Specific tone frequencies
Specific tone amplitudes
A two-tone signal
Which is a video standard used by North American Fast Scan ATV stations?
What is the approximate bandwidth of a slow-scan TV signal?
On which of the following frequencies is one likely to find FM ATV transmissions?
What special operating frequency restrictions are imposed on slow scan TV transmissions?
They are restricted to phone band segments and their bandwidth can be no greater than that of a voice signal of the same modulation type
None; they are allowed on all amateur frequencies
They are restricted to 7.245 MHz, 14.245 MHz, 21.345 MHz, and 28.945 MHz
They are not permitted above 54 MHz
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