## 4 Experimental Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**FNN** & & & & & & & \\ \hline
**Vowel** & & **MFCC** & **MFCC + HOS** & **MFCC + delta** & **MFCC + HOS** & **LPCC** & **LPCC + HOS** \\  & & & & & & & \\  & & & & & & & \\ \hline  & Women and men & 74.04 \(\pm\) 1.08 & 75.00 \(\pm\) 1.57 & 72.44 \(\pm\) 1.26 & 74.04 \(\pm\) 1.69 & 74.68 \(\pm\) 0.98 & **76.92 \(\pm\) 1.36** \\ /a/ & Women & 73.72 \(\pm\) 1.63 & 73.72 \(\pm\) 1.06 & **76.28 \(\pm\) 2.12** & 74.36 \(\pm\) 1.42 & 68.59 \(\pm\) 2.34 & 67.95 \(\pm\) 3.27 \\  & Men & 72.44 \(\pm\) 1.38 & 72.44 \(\pm\) 1.39 & **80.13 \(\pm\) 2.65** & 74.36 \(\pm\) 1.93 & 74.36 \(\pm\) 1.50 & 75.64 \(\pm\) 1.46 \\ \hline  & Women and men & 72.76 \(\pm\) 1.60 & 73.08 \(\pm\) 1.73 & 71.79 \(\pm\) 0.91 & **75.64 \(\pm\) 1.94** & 68.27 \(\pm\) 1.04 & 73.40 \(\pm\) 1.07 \\ /i/ & Women & **79.49 \(\pm\) 1.79** & **80.77 \(\pm\) 2.36** & 75.00 \(\pm\) 3.26 & 76.28 \(\pm\) 1.93 & 69.23 \(\pm\) 1.60 & 75.00 \(\pm\) 1.82 \\  & Men & 71.15 \(\pm\) 1.89 & **75.00 \(\pm\) 2.16** & 70.51 \(\pm\) 1.51 & 74.36 \(\pm\) 2.03 & 73.08 \(\pm\) 1.35 & 74.36 \(\pm\) 0.74 \\ \hline  & Women and men & 70.19 \(\pm\) 1.01 & 70.51 \(\pm\) 1.34 & 68.27 \(\pm\) 1.44 & 70.19 \(\pm\) 1.14 & 72.12 \(\pm\) 1.21 & **73.40 \(\pm\) 0.83** \\ /u/ & Women & 72.44 \(\pm\) 2.32 & 70.19 \(\pm\) 1.14 & 73.08 \(\pm\) 2.50 & **75.00 \(\pm\) 1.49** & 69.87 \(\pm\) 2.09 & **75.00 \(\pm\) 1.73** \\  & Men & 73.72 \(\pm\) 1.81 & 76.92 \(\pm\) 1.70 & 71.79 \(\pm\) 1.26 & 73.08 \(\pm\) 2.01 & 78.21 \(\pm\) 1.33 & **80.77 \(\pm\) 1.14** \\ \hline CNN & & & & & & \\ \hline  & Women and men & 76.60 \(\pm\) 1.30 & **76.60 \(\pm\) 1.82** & 71.15 \(\pm\) 1.83 & 70.51 \(\pm\) 1.23 & 73.40 \(\pm\) 1.02 & 76.28 \(\pm\) 1.13 \\ /a/ & Women & 74.36 \(\pm\) 2.42 & 72.44 \(\pm\) 1.70 & 72.44 \(\pm\) 1.89 & **76.28 \(\pm\) 3.05** & 66.03 \(\pm\) 1.99 & 68.59 \(\pm\) 1.60 \\  & Men & **75.64 \(\pm\) 1.89** & 75.00 \(\pm\) 1.60 & 74.36 \(\pm\) 1.05 & 75.00 \(\pm\) 1.84 & 72.44 \(\pm\) 1.25 & 73.72 \(\pm\) 1.22 \\ \hline  & Women and men & 69.55 \(\pm\) 1.13 & 72.12 \(\pm\) 1.90 & 74.68 \(\pm\) 1.17 & **75.00 \(\pm\) 1.67** & 69.55 \(\pm\) 1.09 & 72.12 \(\pm\) 0.57 \\ /i/ & Women & **76.92 \(\pm\) 1.91** & 75.64 \(\pm\) 2.18 & 69.87 \(\pm\) 2.26 & 72.44 \(\pm\) 1.79 & 69.23 \(\pm\) 1.80 & 73.72 \(\pm\) 0.95 \\  & Men & 73.08 \(\pm\) 1.41 & 73.72 \(\pm\) 2.00 & 71.79 \(\pm\) 2.09 & 71.15 \(\pm\) 1.95 & 69.87 \(\pm\) 0.96 & **76.92 \(\pm\) 1.36** \\ \hline  & Women and men & 69.23 \(\pm\) 0.83 & 70.19 \(\pm\) 1.12 & 70.19 \(\pm\) 0.79 & 70.51 \(\pm\) 1.30 & 69.23 \(\pm\) 0.90 & **70.83 \(\pm\) 0.85** \\ /u/ & Women & 71.15 \(\pm\) 1.71 & 71.15 \(\pm\) 0.97 & 75.00 \(\pm\) 1.68 & **76.92 \(\pm\) 1.87** & 67.95 \(\pm\) 1.17 & 73.72 \(\pm\) 1.8 \\  & Men & 74.36 \(\pm\) 1.06 & 75.00 \(\pm\) 1.28 & 77.56 \(\pm\) 1.56 & 75.64 \(\pm\) 1.23 & **82.69 \(\pm\) 1.42** & 75.00 \(\pm\) 1.41 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Classification results obtained by various parameters and deep learning methods focused on sex and individual vowels. excellent classification accuracy, 82.69%, can be achieved using the proposed CNN and LPCC combinations.