Question
What aspect of an analog slow-scan television signal encodes the brightness of the picture?
Answer Options
- A) Tone frequency
- B) Tone amplitude
- C) Sync amplitude
- D) Sync frequency
Correct Answer: A
Explanation
Analog Slow-Scan Television (SSTV) operates by transmitting a continuously varying audio tone over an SSB channel. This audio tone typically ranges from about 1500 Hz to 2300 Hz. The entire image is encoded within the changes of this audio frequency.
In this system, the various aspects of the picture’s intensity and color are represented by specific audio tone frequencies. Specifically, the tone frequency encodes the brightness (luminance or intensity) of each pixel in the image. For example, a low frequency might represent black, and a high frequency might represent white, with intermediate frequencies representing shades of gray.
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