Development of string model whose delay line length controlled by Anjok in gayageum

In this paper, we describe characteristics of a movable bridge called Anjok and propose an improved string model which has delay line controller in physical modeling of gayageum. Movable bridge, Anjok determines a length of vibrating string and transmits a vibration of string to a body of gayageum. Because the length of string changes fundamental frequency, we analyze the variation in frequencies and implement the Anjok model as parametric form using the first-order polynomial fitting in logarithmic domain. String model which contains Anjok model can represent real tuning system of real gayageum and gaygaguem model could synthesize sounds similar to original sounds.