Research on the end of the century to the present 20
.Henderson 1949 (auditory Phonetic Sciences). Study of the second Henderson to compare the phonetic tone ในภาษาไทยมาตรฐาน during half a century after the first It was found that in the younger generation tonal masters a fall less than before.High - 52 fall [] Arun 1986 / 2529 (auditory phonetics * speech), the researcher found that the master has the characteristics of sound, middle - - medium [] or 343 sound floats. (sound floating.It can be seen that the above two pieces of research at the end of this century 20 tones sound is a sound master end floating likewise
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