*Question E2B06:
What is vestigial sideband modulation?*  

*Correct Answer is  A: Amplitude modulation in which one complete sideband and a portion of the other are transmitted*  

### AI Response: (may contain errors)  

Vestigial sideband modulation (VSB) is a form of amplitude modulation (AM) where one complete sideband is transmitted along with a portion of the other sideband. This technique is commonly used in television broadcasting to efficiently transmit video signals.

### Correct Answer Explanation:
- **A: Amplitude modulation in which one complete sideband and a portion of the other are transmitted**  
  This is the correct definition of vestigial sideband modulation. In VSB, the full lower sideband is transmitted, while only a part of the upper sideband is included. This allows for a more efficient use of bandwidth while still preserving the necessary information for demodulation.

### Incorrect Answer Explanations:
- **B: A type of modulation in which one sideband is inverted**  
  This describes a different concept, typically related to single sideband (SSB) modulation, where one sideband is suppressed and the other is inverted. VSB does not involve inverting a sideband.

- **C: Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier**  
  This statement is incorrect because VSB is not related to frequency modulation (FM) but rather to amplitude modulation (AM). VSB retains both sidebands, albeit in a partial form.

- **D: Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation**  
  This option describes a different modulation technique that combines FM and SSB, which is not what VSB is about. VSB does not involve spread spectrum techniques.

### Summary:
- VSB is a hybrid of AM that transmits one full sideband and part of the other, optimizing bandwidth while maintaining signal integrity.
- Remember that VSB is primarily used in television broadcasting, where it helps to transmit video signals effectively.

### Key Points:
- VSB allows for efficient bandwidth usage.
- It retains one complete sideband and a portion of the other.
- It is distinct from SSB and FM modulation techniques.