Question
What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?
Answer Options
- A) An adaptive filter
- B) A crystal-lattice filter
- C) A Hilbert-transform filter
- D) A phase-inverting filter
Correct Answer: A
Explanation
Digital Signal Processing (\text{DSP}) provides highly effective methods for noise reduction that are not possible with analog components. For noise like static, hiss, and general atmospheric disturbances in an \text{SSB} signal, the filter needs to distinguish the voice components from the noise on a continuous, dynamic basis.
An adaptive filter is the type of \text{DSP} audio filter used for this task. An adaptive filter constantly monitors the characteristics of the incoming noise in real time and continuously adjusts its own filter coefficients to estimate and subtract the noise profile while trying to preserve the voice or desired signal components. This dynamic self-adjustment makes it superior to fixed filters for removing non-stationary noise.
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