Table 1 Codebooks of an energy pattern in the syllable “u” (number of training data: 556; codeword unit: dB)

Segment #1

[50.621429 49.954460 49.260521]

[55.270870 54.926376 54.276802]

[42.995041 43.893917 46.077393]

[61.238552 61.125961 60.872932]

Segment #2

[54.152412 54.538475]

[48.779587 48.376892]

[42.987476 42.105495]

[61.043819 61.857407]

Segment #3

[43.920788 42.156853 37.482262]

[50.758591 49.041313 43.996132]

[56.621819 56.363434 51.977314]

[63.510189 64.381699 62.834660]