*Question E8A07:
What determines the PEP-to-average power ratio of an unprocessed single-sideband phone signal?*  

*Correct Answer is  B: Speech characteristics*  

### AI Response: (may contain errors)  

To determine the PEP-to-average power ratio of an unprocessed single-sideband (SSB) phone signal, we need to understand the role of speech characteristics.

### Correct Answer: B: Speech characteristics

- **Explanation**: The PEP (Peak Envelope Power) to average power ratio in an SSB signal is primarily influenced by the characteristics of the speech being transmitted. Human speech has varying amplitudes and frequencies, which leads to peaks in the signal that are much higher than the average power. This results in a high PEP-to-average power ratio. 

### Why the Other Choices are Incorrect:

- **A: The frequency of the modulating signal**: 
  - While frequency can affect the bandwidth and propagation characteristics of the signal, it does not directly influence the PEP-to-average power ratio. The ratio is more about the dynamics of the speech signal rather than its frequency.

- **C: The degree of carrier suppression**: 
  - Carrier suppression refers to how much of the carrier signal is removed in SSB transmission. While it is important for efficiency and reducing power waste, it does not directly determine the PEP-to-average power ratio. The ratio is more related to the variations in the speech signal itself.

- **D: Amplifier gain**: 
  - Amplifier gain affects the overall power output of the signal but does not change the inherent characteristics of the speech signal that dictate the PEP-to-average power ratio. The ratio is a function of the signal's modulation characteristics rather than the amplification process.

### Summary

- The PEP-to-average power ratio is determined by the dynamics of the speech signal, which includes its peaks and average levels. Understanding this relationship is crucial for effective SSB transmission and ensuring efficient use of power.