Discussion
The stereo difference signal occupies which part of the composite baseband?
Answer: A
The difference signal is double-sideband suppressed carrier about 38 kHz, so it spans 23 to 53 kHz for audio to 15 kHz. The sum signal occupies 0 to 15 kHz and is what a mono receiver uses. 57 kHz and above carries radio data. And 15 to 19 kHz is the guard space that keeps the pilot clear of the audio. Sketching the composite spectrum once makes the whole multiplex arrangement memorable.
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