Question
What type of digital signal processing filter is used to generate an SSB signal?
Answer Options
- A) An adaptive filter
- B) A notch filter
- C) A Hilbert-transform filter
- D) An elliptical filter
Correct Answer: C
Explanation
Generating a Single-Sideband (\text{SSB}) signal requires converting the baseband audio into a signal with only one sideband (upper or lower) and no carrier. While this can be done with analog crystal filters, a highly effective and stable method uses Digital Signal Processing (\text{DSP}), known as the phase shift method.
This phase shift method requires splitting the baseband audio signal into two components that are 90^\circ apart in phase, which is achieved by a Hilbert-transform filter. The Hilbert transformer produces the necessary phase-shifted version of the audio signal, allowing the two components to be combined digitally to cancel the unwanted sideband, resulting in a clean, stable \text{SSB} signal.
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