Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Physical modeling synthesizing of 25 strings Gayageum using white noise as exciter

화이트 노이즈를 익사이터로 이용하는 25현 가야금의 피지컬 모델링 신디사이징

  • Bae, June (Department of Computer Science, The University of Suwon) ;
  • Kim, Jangyoung (Department of Computer Science, The University of Suwon) ;
  • Yang, Yoongi (Department of Information Communication, The University of Suwon)
  • Received : 2018.02.21
  • Accepted : 2018.05.09
  • Published : 2018.05.31
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Abstract

Up until now, attempts to produce computer instruments have been largely focused on two types of sampling methods and physical modeling. Since the sampling method removes much of the harmonics in the sampling process, the effect of exciter that emphasizing the harmonic of the strings are mini. However, the physical modeling method can produce a lot of harmonics, and by emphasizing the harmonics of a particular frequency band among these harmonics, it is possible to produce a sound more like a lively sound. In this paper, we propose a method of using white noise in realizing exciter emphasizing harmonics of pre - specified frequency band in prefectural physical modeling. And comparing the envelope and spectrum of the Gayageum sound, we confirmed that the physical modeling method with the exciter is more suitable for the actual Gayageum sound than the sampling method and the conventional physical modeling method.

지금까지 컴퓨터악기 제작시도는 크게 샘플링 (sampling)방식과 피지컬 모델링(physical modeling)의 2가지 방식이 주를 이루었다. 샘플링 방식은 샘플링 과정에서 배음의 많은 부분이 삭제되기 때문에 현의 배음을 강조하는 익사이터(exciter) 효과가 미미하다. 하지만 피지컬 모델링 방식에서는 많은 배음을 지닌 음을 만들어 낼 수 있으며 이 배음 중 특별한 주파수대의 배음을 강조함으로써 더욱 실음에 가까운 음색을 만들어 낼 수 있다. 여기서는 현의 피지컬 모델링에 있어서 현의 특정 주파수대의 배음을 강조하는 익사이터를 구현함에 있어 화이트노이즈(백색소음)을 이용하는 방법을 제안한다. 그리고 가야금 소리의 엔벨로프(envelope)와 스펙트럼 비교를 통해 익사이터를 갖는 피지컬모델링 방식이 샘플링 방식 및 기존의 피지컬 방식보다 실제 가야금 소리에 더 적합함을 확인하였다.

Keywords

References

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