*Question E4C03:
What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?*  

*Correct Answer is  C: Capture effect*  

### AI Response: (may contain errors)  

In an FM receiver, the **capture effect** is the phenomenon where the receiver only demodulates the stronger of two signals on the same frequency, effectively suppressing the weaker signal. This is why the correct answer is **C: Capture effect**.

### Explanation:

1. **Capture Effect (Correct Answer)**:
   - The capture effect occurs in FM receivers when two signals are present on the same frequency. The receiver will "capture" and demodulate the stronger signal while ignoring the weaker one. This is a characteristic of FM modulation and is beneficial in reducing interference from weaker signals.

2. **Why Other Choices Are Incorrect**:
   - **A: Desensitization**: This refers to the reduction in receiver sensitivity due to a strong nearby signal, not the suppression of one signal by another on the same frequency.
   - **B: Cross-modulation interference**: This occurs when a strong signal modulates the desired signal, causing distortion. It is not related to the suppression of one signal by another on the same frequency.
   - **D: Frequency discrimination**: This is a technique used in FM receivers to convert frequency variations into amplitude variations for demodulation. It does not describe the suppression of one signal by another.

### Key Points:
- The capture effect is unique to FM receivers and is not present in AM receivers.
- It helps in reducing interference from weaker signals, making FM a preferred choice for high-fidelity audio transmissions.