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Problem statement: In speech communication, noises from surrounding environments&#13; affect the communication quality with various aspects. The received speech quality should be analyzed&#13; to see how the important noises reduce the speech quality so that we can eliminate them in an&#13; appropriate way. Approach: This study presents a study on the analysis of the noise effects on Thai&#13; speech. Four kinds of noises; air conditioner, car, factory and train, are chosen to be simulated in the&#13; study. The various levels of signal-to-noise ratios are conducted. The root mean square error between&#13; the fundamental frequency contours of the corrupted speech and the clean speech is calculated. Finally,&#13; the analysis of the root mean square error in terms of comparisons among genders, the four kinds of&#13; noises and various levels of signal-to-noise ratios is performed. Results: In the experiments, 400&#13; speech utterances of male and female are used as speech materials. The average values of root mean&#13; square error are calculated. The results show that the fundamental frequency contour of female speech&#13; is affected more than that of male speech. Comparing among four kinds of noises, the car noise has the&#13; highest influence, while the factory noise has the lowest influence. Moreover, the root mean square&#13; error is inversely proportional to the level of signal-to-noise ratio. Conclusion: From the finding, the&#13; noises from surrounding environments have affected the speech quality of fundamental frequency&#13; contour. This study is the preliminary knowledge to enhance the speech quality for further works such&#13; as speech synthesis systems or other speech processing technologies

Effects of Noises on the Analysis of Fundamental Frequency Contours for Thai Speech