(c) Standard of quality preference scores
(1) Very bad. I can't understand what the sentence is saying. It is difficult to guess meaning.
(2) Bad. some key words are hard to hear.
(3) Fair. I can understand the meaning of the sentence, but it is hard to keep listening for more than 10 minutes.
(4) Good. clear and easy to understand.
(5) Excellent. The voice of the announcer. I'm comfortable listening to it.
(d) Standard of similarity preference scores
(1) I'm sure they are from different speakers.
(2) I'm not sure if they are from different speakers.
(3) I'm not sure if they are from the same speaker.
(4) I'm sure they are from the same speaker.
