Discussion
How does a stereo decoder recover the two channels?
Answer: C
Adding and subtracting the recovered sum and difference signals gives the left and right channels directly, which is why the multiplex encodes them that way rather than as two separate audio bands. The channels are not separable by sideband. Envelope detection fails on a suppressed-carrier signal. And the pilot serves only to regenerate the subcarrier. The matrix at each end is the elegance of the scheme.
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