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The word “acoustic” is a Greek word, which means able to be heard. Many of the behaviors felt or exhibited by humans can be detected by analysis of that person’s speech and voice like emotions (stress, anger, fear, sadness, depression, excitement, elation, and happiness), States induced by external conditions (ethanol intoxication and drugs), Certain Intentional behaviors (deception, untruths, disguise and other intent), and Health states (cold/flu and fatigue).This paper has demonstrated that acoustic properties of consonants as well as of vowels plays significant roles in inter and intra speaker variation for normal and disguise voice. In our present study, about eight Punjabi sentences were used as a sample for identification of various phonetic parameters from ten. Findings from present study suggested that there is huge difference in parameters for both inter and intra variation of speech for same speaker.
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