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A Simple and Fast Pitch Search Algorithm Using a Modified Skipping Technique in CELP Vocoder
이주헌,배명진,권춘우,Lee, Joo-Hun,Bae, Myung-Jin,Kwon, Choon-Woo The Acoustical Society of Korea 1995 韓國音響學會誌 Vol.14 No.e2
CELP 보코더에서의 피치검색에 있어서, 음성신호의 상관함수의 몇가지 특성을 이용한 스킵기법은 음질의 저하를 거의 일으키지 않으면서 피치검색에 필요한 계산량을 줄여준다. 하지만, 때때로 양의 상관값을 갖는 검색대상피치들이 검색에서 제외되어 음질이 저하되는 것을 완전히 막을 수는 없다. 이러한 단점을 보완하기 위해서 약식의 상관함수식을 이용한 개선된 스킵기법을 제안한다. 제안된 방법을 기존의 전체검색방법보다 계산량을 35% 이상 줄이면서도 음절이 저하는 일어나지 않는다. Based on the Characteristics of the correlation function of speech signal, the skipping technique can reduced the computation time considerably with a little degradation of speech quality. To improve the speech quality of the skipping technique, we use the reduced form of the correlation function to check the sign of the correlation value before the match score is calculated. The experimental results show that this modified skipping technique can reduce the computation time in pitch search over 35% compared with the traditional full search method without quality degradation.
한국 벤처캐피탈의 조직상황적 특성, 인적자원 특성 및 투자전략 간의 관계에 관한 연구
이주헌,Lee, Joo-Heon 한국벤처창업학회 2007 벤처창업연구 Vol.2 No.4
There are many different types of risk capital competing for deals in the korean entrepreneurial capital market. In the past, even though korean private venture capitalists did not have their distinctive competitive advantages, due to government support and subsidies, they could be survived in the market. However, the government controlled area has changed to a market driven area which emphasizes market forces and competition rather than support and protection. In order to be competitive, Korean private venture capital firms need to recruit high calibre professionals and build required financial skills for wise entrepreneurial investments. The purpose of this article is to analyze the relationships among firm characteristics, human resources, and investment strategies of korean venture capital firms. We can find that the asset size of venture capital firms has a positive effect on the size of their human resources. However, we can not find any relationship between firm characteristics and investment strategies of venture capitals. Even though we find some evidences among some variables, we need to interpret the results very carefully. Further research would be needed to carried out to clarify the disputable interpretations and our understanding of this area.