Which STI value is considered intelligible?

Which STI value is considered intelligible?

• A. 0.3
• B. 0.7
• C. 0.9
• D. 0.5

Answer: (D)

STI measures how well speech can be understood after transmission; higher values mean clearer, more intelligible speech. A value around 0.5 is typically the minimum at which speech starts to be intelligible to listeners. Values at or above this level tend to be understandable, while values below generally are not. So, among common options, the value near 0.5 represents the intelligibility threshold: it’s the point where speech becomes understandable, whereas much lower values are not, and much higher values indicate clear, easily understood speech.

STI measures how well speech can be understood after transmission; higher values mean clearer, more intelligible speech. A value around 0.5 is typically the minimum at which speech starts to be intelligible to listeners. Values at or above this level tend to be understandable, while values below generally are not. So, among common options, the value near 0.5 represents the intelligibility threshold: it’s the point where speech becomes understandable, whereas much lower values are not, and much higher values indicate clear, easily understood speech.