Question
Which method generates an SSB signal using digital signal processing?
Answer Options
- A) Mixing products are converted to voltages and subtracted by adder circuits
- B) A frequency synthesizer removes unwanted sidebands
- C) Varying quartz crystal characteristics are emulated in digital form
- D) Signals are combined in quadrature phase relationship
Correct Answer: D
Explanation
Digital Signal Processing (\text{DSP}) provides a very precise and stable method for generating \text{SSB} signals, eliminating the need for expensive, crystal-based analog filters. This method is based on signal cancellation using phase relationships.
This digital method generates an \text{SSB} signal by ensuring that signals are combined in quadrature phase relationship (a 90^\circ relationship). The \text{DSP} splits the audio and the \text{RF} carrier into 90^\circ phase-shifted pairs (I and Q signals) and then combines them in a summing circuit. The unique 90^\circ relationship between the components causes one sideband to be reinforced while the other is canceled, leaving only the single sideband and suppressed carrier.
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