Author(s): Mausmita Devi, Laba Kr. Thakuria, Purnendu Bikash Acharjee, Pranhari Talukdar
Nasal voice in any language, are the only class of sounds which dominant speech output is from nasal cavity as compared to the oral cavity . In nasal sounds resonance occurs through the nose. So, n asals have some special features like presence of zeros in the spectrum, and concentration of energy at lower frequency level etc. In this paper we discuss on acoustic characteristics of Assamese nasal phonemes and their properties. The paper further discusses about the classification of acoustical behaviour between nasal and semi vowel sounds present in Assamese language. It is found from the experiment that Assamese nasal sounds have their spectral properties prominent at around the range of 2 to 4.5 kHz. From the proposed study it is reported that concentration of energy lies in the lower frequency region. Because, the first formant present at around 2.5 kHz and then another formant may present at around 4.5-5 kHz.