🔍 Key Concepts

• Pre-emphasis in a transmitter audio stage • De-emphasis in a receiver audio stage • Relationship between audio frequency response and noise in communications systems

💭 Think About

• What does pre-emphasis do to high-frequency audio components before transmission? • If the transmitter boosts certain frequencies, what must the receiver do to restore a natural or ‘flat’ audio response? • How does changing the relative level of high frequencies affect how noise is heard at the receiver?

✅ Before You Answer

• Identify how pre-emphasis and de-emphasis work together as a pair in a communication system. • Consider which choice mentions both audio response and noise behavior at the receiver. • Eliminate any option that conflicts with the known purpose of squelch (muting) versus shaping frequency response.