What is the approximate bandwidth of a typical single sideband (SSB) voice signal?

The approximate bandwidth of a typical single sideband (SSB) voice signal is around 3 kHz. This is because SSB modulation effectively transmits only one sideband of the carrier wave, which carries the audio information. In voice communications, the frequency range that encompasses the intelligibility of speech typically requires about 3 kHz of bandwidth. This allows for the fundamental frequencies and significant harmonic content of human voice to be transmitted clearly while remaining efficient in terms of spectrum usage.

The other options indicate bandwidths that are either too narrow or too wide for typical SSB voice communications. A 1 kHz bandwidth would not be sufficient to adequately transmit the necessary components of voice signals, and higher bandwidths, such as 6 kHz and 15 kHz, would not be required for standard voice communication under normal conditions and would unnecessarily occupy more spectrum space. Thus, the 3 kHz figure aligns with the requirements for efficient and clear voice communication via SSB.