Discussion
What does pre-emphasis and de-emphasis together achieve?
Answer: B
Boosting treble before modulation and cutting it after detection leaves the signal unchanged while attenuating the noise that rose with frequency, a net gain of several decibels at the top of the band. Bandwidth increases slightly rather than reducing, since the boost deepens deviation on bright material. Threshold and capture are unaffected, being properties of the limiter and discriminator. Any matched pre- and post-filter pair works this way when the noise spectrum is not flat.
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