What does STI measure?

What does STI measure?

• A. Signal Quality at the Source
• B. Hearing Aid Gain
• C. Ambient Noise Level
• D. Speech Transmission in an Environment

Answer: (D)

STI measures how well speech is preserved as it travels through an environment to a listener. It captures speech intelligibility by accounting for how reverberation, background noise, and other degradations affect the speech signal that reaches the ear. A higher STI means speech remains clearer and easier to understand in that setting. This isn’t about the quality of the original signal at the source, nor about how much amplification a hearing aid provides, and while ambient noise influences intelligibility, STI is the overall measure of how well speech is transmitted through the environment. So it specifically describes speech transmission in an environment.

STI measures how well speech is preserved as it travels through an environment to a listener. It captures speech intelligibility by accounting for how reverberation, background noise, and other degradations affect the speech signal that reaches the ear. A higher STI means speech remains clearer and easier to understand in that setting.

This isn’t about the quality of the original signal at the source, nor about how much amplification a hearing aid provides, and while ambient noise influences intelligibility, STI is the overall measure of how well speech is transmitted through the environment. So it specifically describes speech transmission in an environment.