Which receiver function is specifically used to reduce noise and unwanted signals?

Which receiver function is specifically used to reduce noise and unwanted signals?

• A. Rejection
• B. Amplification
• C. Compression
• D. Demodulation

Answer: (A)

Reducing noise and unwanted signals in the ultrasound receiver is accomplished by rejection, which acts like a filter to suppress components outside the desired frequency range or that contribute clutter. By attenuating these unwanted parts, the true echoes stand out more clearly, improving the signal-to-noise ratio. Amplification would boost both signal and noise, so it doesn’t specifically reduce noise. Compression changes the dynamic range without removing noise. Demodulation focuses on extracting the usable information from the RF signal, not on filtering out noise. So rejection is the function designed to minimize noise and unwanted signals.

Reducing noise and unwanted signals in the ultrasound receiver is accomplished by rejection, which acts like a filter to suppress components outside the desired frequency range or that contribute clutter. By attenuating these unwanted parts, the true echoes stand out more clearly, improving the signal-to-noise ratio. Amplification would boost both signal and noise, so it doesn’t specifically reduce noise. Compression changes the dynamic range without removing noise. Demodulation focuses on extracting the usable information from the RF signal, not on filtering out noise. So rejection is the function designed to minimize noise and unwanted signals.