*Question E7F03:
What type of digital signal processing filter is used to generate an SSB signal?*  

*Correct Answer is  C: A Hilbert-transform filter*  

### AI Response: (may contain errors)  

To generate a Single Sideband (SSB) signal, a specific type of digital signal processing filter is used:

### Correct Answer: C: A Hilbert-transform filter

1. **Why the correct answer is correct:**
   - A **Hilbert-transform filter** is used in the generation of SSB signals because it can create a 90-degree phase shift across a wide range of frequencies. This phase shift is essential for suppressing one of the sidebands in the modulation process, which is the key characteristic of SSB signals. The Hilbert transform helps in creating the necessary conditions for the signal to have only one sideband.

2. **Why the other choices are incorrect:**
   - **A: An adaptive filter**: This type of filter is used to adjust its parameters automatically to minimize error signals, often used in noise cancellation or echo suppression, not specifically for generating SSB signals.
   - **B: A notch filter**: This filter is designed to remove or "notch out" a specific frequency or narrow band of frequencies, typically used for interference rejection, not for SSB generation.
   - **D: An elliptical filter**: This filter is used for its sharp cutoff characteristics in frequency selection applications, but it does not provide the necessary phase shift for SSB signal generation.

### Key Concept:
- **SSB Generation**: The Hilbert-transform filter is crucial in the SSB generation process because it allows for the creation of a signal with only one sideband by providing the necessary phase shift to cancel out the unwanted sideband.