Question
How is color information sent in analog SSTV?
Answer Options
- A) Color lines are sent sequentially
- B) Color information is sent on a 2.8 kHz subcarrier
- C) Color is sent in a color burst at the end of each line
- D) Color is amplitude modulated on the frequency modulated intensity signal
Correct Answer: A
Explanation
Slow-Scan Television (SSTV) uses much narrower bandwidths than Fast-Scan TV, often transmitting in the audio range of an SSB signal. This narrow bandwidth means that complex color encoding techniques used in FSTV, such as simultaneous transmission of chroma and luma, are not feasible. Instead, the image must be transmitted much slower, line by line, and color component by color component.
In analog SSTV, color information is sent by transmitting the primary color components (Red, Green, and Blue) of the image pixels one after the other. This means color lines are sent sequentially. The receiving software processes and recombines these separate sequential transmissions into a single color image over the course of the total transmission time (which can be seconds or minutes, depending on the SSTV mode).
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