Speech sounds contain thousands of acoustical features. The linguistic acoustical features can be importantly used to recognize the identity of the speakers due to the fact that every person produces different sounds. This paper is descriptively aimed to investigate the role of tone frequency characters to recognize a speaker’s identity. In order to achieve the objective of this research, the researcher pictures the character of tone frequencies by using PRAAT 4.5.1.4. Supported by mathematical measurement, the writer will formulize the role of these features for identification of personal identity and describe the logical implication of this formulation. Keywords: Tone, frequency, acoustic, identity, recognition
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