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허만탁 釜山工業大學校 1992 論文集 Vol.34 No.-
In this study, the first and the second formants of Korean 6 single vowels over chirdern through the olds and, male and female are extracted. The extraction method is discribed. The young's voice was studied with deal. The distribution of formants was not very clear, particulaly about/a/, /oe/, /o/ and /u/. This might caused by similar tong's position and lip's shape. Especially, /o/ and /u/ are difficult to seperate in two. Beside, old's and children's voise were studied, too. Their feature was different from young's. sampling rate is 10[KHz] and resolution is 12 bit.
許萬鐸 釜山工業大學校 1995 論文集 Vol.37 No.-
In this paper, a diffusion filter bank which needs very less hardware than conventional one is introduced, and the results of extracting spectum from real speech signals by use of that are presented. The spectra extracted from the signals by simmulation have so smooth envelope that we can estimate it is suitable for speech recognition which demand many channels with diffrent center freqencies, and smooth spectrum of speech signals.
허만탁 釜山工業大學校 1988 論文集 Vol.30 No.-
In this paper, high speed multiplication algorithm using a minimum redundant P-ary representation and its implementation are suggested. According to this algorithm, it calculates the partical products in a constant time not concernning with the digit length n of an arbitrary radix. Terefire ut us resoected that the multiplier using a minimum redundant P-ary representation is a higher speed multiplier than the multiplier using redundant binary representation, than arraytype multiplier and than parallel count typemultiplier.