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 interlace scanning pattern generated in a fast-scan (NTSC) television system?
By scanning odd numbered lines in one field and even numbered ones 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 sideband is transmitted
A type of modulation in which one sideband is inverted
Narrow-band FM transmission 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 video signal component that carries color information?
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 transceiver with SSB capability and a suitable computer, is needed to decode SSTV based on 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 transmitted 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 callsign of the station transmitting
How are analog slow-scan television 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 FM
How many lines are commonly used in each frame on an amateur slow-scan color television picture?
128 or 256
30 to 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 of the following is the video standard used by North American Fast Scan ATV stations?
Which of the following is NOT a characteristic of FMTV (Frequency-Modulated Amateur Television) as compared to vestigial sideband AM television?
Immunity from fading due to limiting
Poor weak signal performance
Greater signal bandwidth
Greater complexity of receiving equipment
What is the approximate bandwidth of a slow-scan TV signal?
On which of the following frequencies is one likely to find FMTV 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
If 100 IRE units correspond to the most-white level in the NTSC standard video format, what is the level of the most-black signal?
7.5 IRE units
140 IRE units
0 IRE units
-40 IRE units
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer