Discussion
What is the effect of phase error in the regenerated 38 kHz subcarrier?
Answer: B
Coherent detection depends on phase, so an error leaks part of each channel into the other and separation degrades, which is exactly why the pilot is transmitted and doubled rather than a free-running oscillator being used. Pitch shifts follow frequency errors in single sideband rather than here. The sum signal is recovered independently of the subcarrier. And muting responds to level. Every quadrature system fails first in crosstalk when its phase reference is imperfect.
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