Discussion
What does a mono receiver do with the stereo multiplex signal?
Answer: B
It uses the 0 to 15 kHz sum signal and its audio filtering discards everything above, which is exactly the backward compatibility the multiplex was designed for. The difference signal alone would give an unlistenable result. Decoding both channels requires a stereo decoder the mono set does not have. And the pilot is deliberately inaudible and harmless. Designing a new service so that existing receivers still work is a recurring constraint in broadcasting.
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