Discussion
Why is the stereo difference channel noisier than the sum channel?
Answer: B
The discriminator's noise rises with baseband frequency, so the difference signal at 23 to 53 kHz suffers far more than the sum signal at 0 to 15 kHz, which is why stereo reception needs a stronger signal than mono and why receivers blend to mono when it weakens. The deviation allocation is comparable. Regeneration is a phase matter rather than a noise one. And the matrix is passive. The triangular noise spectrum explains the whole behaviour.
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