Extra exam question E7F02

WhyAn adaptive filter is the digital signal processing audio filter used to remove unwanted noise from a received SSB signal. An adaptive filter is the kind of digital signal processing audio filter used to remove unwanted noise from a received SSB signal, continuously adjusting its own filtering characteristics in real time based on the actual signal and noise present, rather than using a fixed, predetermined response, answer A. A crystal-lattice filter is a hardware RF/IF filter, a Hilbert-transform filter is used for generating SSB signals rather than reducing noise in a received one, and "phase-inverting filter" isn't a real standard noise-reduction filter type.