## 4 Experimental Results
### Results of Experiments with Subtitles  
In response to the question, \"Choose the one with or without subtitles that you think is useful, and why?\", the subjects answered that they preferred the presence of subtitles for all three types of clips, as shown in Figure 19.  
Regarding subtitles, as presented in Table 9, the subjects responded that subtitles and sign language should be provided together to help people with hearing impairment acquire information, and that subtitles also help them to learn unknown words or vocabulary. Some mentioned the problem of the arrangement and speed of subtitles, saying that the speed of subtitles was too fast for DHH individuals and hard to see at the same time with sign language. Therefore, many commented that it would be better to provide 2-3 lines of subtitles instead of one line, allowing the subtitles to stay on the screen longer, so that people do not miss the content while watching it alternat \begin{table}
\begin{tabular}{c p{142.3 pt}} \hline \hline
**Sign Language** & For clip no. 2, it’s awkward because I’m not used to the location of the sign language interpreter there. The sign language interpreter and the weather caster are positioned too far, so it’s very inconvenient to see. It was good though that the sign language screen has been moved so it does not block the contents of the screen. \\ \hline
**Size of the Reference Footage** & Clip no. 3 has a smaller data screen, but the size of the interpreter is larger, making it easier to understand and more convenient. \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Subjects’ opinions on the weather report clips. Figure 18: Results of eye tracker experiments with weather report cases. Regarding the experiments with subtitles added to the three types of video clips, all subjects answered that the subtitles are necessary for the news clips. They responded that there may be unfamiliar expressions if only a sign language interpreter is provided, but when subtitles and sign language interpretation are provided together, this gives them an opportunity to understand or learn difficult words. Looking at the eye tracker data analysis results for news type footage, some subjects looked at the subtitles more than the sign language interpreters. For the panel discussion type, three conditions were tested: (1) No subtitles, (2) One representative subtitle, and (3) Individual subtitles for each of the multiple speakers. As shown in Figure 20, 2 out of 21 subjects answered that it was easier to see the clips without subtitles, and 19 answered that they liked it better when subtitles are provided. Among the 19 subjects who answered they preferred the presence of the subtitles, 6 said they preferred one integrated subtitle and 13 preferred individual subtitles for each speaker. Figure 19: Results of experiments with subtitles. Figure 20: Preference on integrated or individual subtitles for multiple speakers. \begin{table}
\begin{tabular}{p{128.0 pt} p{284.5 pt}} \hline \hline \multirow{3}{*}{**Role of the Subtitles**} & It’s better when subtitles and sign language are provided together. With subtitles, you can study vocabulary or sentences that you don’t understand. You can see both sign language and subtitles to get a more accurate understanding of the meaning. \\ \hline \multirow{3}{*}{**Arrangement of the Subtitles**} & If the distance between the sign language interpreter and the subtitles is far, it is inconvenient to see both since your eyes are moving back and forth. Since the subtitles pass by too fast, it would be better to have 2–3 lines rather than 1 line on the screen. \\ \cline{1-1} \cline{2-3}  & & If the distance between the sign language interpreter and the subtitles is far, it is inconvenient to see both since your eyes are moving back and forth. Since the subtitles pass by too fast, it would be better to have 2–3 lines rather than 1 line on the screen. \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Subjects’ opinions on the subtitles.