What are pre-emphasis and de-emphasis networks? Explain their need in

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Module 3: Probability & Random Processes

20257m

What are pre-emphasis and de-emphasis networks? Explain their need in communication systems.

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Pre-emphasis: High-pass at transmitter boosting highs ( $75\mu$ s) before FM, high-freq noise dominates. De-emphasis low-pass at receiver restores flat and suppresses high-freq noise. Improves SNR ~10dB. Block $m$ →HPE→FM→chan→FM demod→LPF→ $m$ .

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