*Question E2B05:
Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?*  

*Correct Answer is  C: Vestigial sideband reduces the bandwidth while increasing the fidelity of low frequency video components*  

### AI Response: (may contain errors)  

Vestigial sideband (VSB) is a modulation technique used in analog fast-scan TV transmissions. Let's break down the correct answer and why the other options are incorrect.

### Correct Answer: 
**C: Vestigial sideband reduces the bandwidth while increasing the fidelity of low frequency video components.**

- **Explanation**: 
  - VSB is designed to reduce the bandwidth required for transmission by eliminating one of the sidebands (the lower sideband) while retaining a portion of the other sideband (the upper sideband). 
  - This technique allows for better fidelity of low-frequency components of the video signal, which are crucial for maintaining picture quality, especially in the presence of limited bandwidth.

### Why the Other Choices are Incorrect:

- **A: The vestigial sideband carries the audio information**  
  - **Explanation**: VSB is primarily concerned with video transmission, not audio. Audio information is typically transmitted separately in TV broadcasts, often using a different modulation scheme.

- **B: The vestigial sideband contains chroma information**  
  - **Explanation**: While chroma (color) information is part of the video signal, VSB does not specifically focus on carrying chroma information. Instead, it optimizes the overall video signal, including both luminance (brightness) and chrominance (color).

- **D: Vestigial sideband provides high frequency emphasis to sharpen the picture**  
  - **Explanation**: VSB does not inherently provide high-frequency emphasis. Instead, it reduces bandwidth while maintaining fidelity for low-frequency components. High-frequency emphasis is more related to other techniques like pre-emphasis in audio processing.

### Summary:
- VSB is effective in reducing bandwidth while preserving the quality of low-frequency video components, making it suitable for analog fast-scan TV.
- Remember that VSB is not about audio or chroma specifically, nor does it focus on high-frequency emphasis.

This understanding will help you grasp the principles behind vestigial sideband modulation and its application in TV transmissions for your Extra Class exam.