The purpose of this research is to analyze and compare the tones of Bangkok Thai as spoken by the Thai, the Chao Zhou and the Sikhs. Tones in Bangkok Thai citation forms and connected speech in the speech of the Thai are used as the reference... of Bangkok Thai. The study focuses on two aspects: the tonal systems in citation form and the tonal characteristics in both citation forms and connected speech. The tones produced by thirty informants, the Thai, the Chao Zhou and the Sikhs have been analyzed

. This research was conducted by having the participants produce a set of monosyllabic words in citation forms and in devised sentences in order to show how Japanese speakers with varying experience in Thai produce the Thai tones, and how the Thai tones produced...: the static tones (the mid tone and the low tone) and the dynamic tones (the high-falling tone, the mid-rising tone and the low-rising tone). In citation forms, it was found that the Japanese speakers with different experience in Thai produced some tones

studied in this research are fundamental frequency, intensity and duration. The data was collected from three tracheoesophageal speakers and three normal speakers.The uttterances are 80 citation forms of words,which were analyzed and processed by computer