Shin M., Wang S.

With the advent of digital signal processing technique, noticeable development was achieved in the field of room acoustics. Many applications, acoustic feedback (echo) cancellation, virtual acoustics, sound field control and so on, require exact and efficient model of room transfer function. However, there are several problems to be solved for the manipulation of these room transfer functions. Several signal processing methods which deal with room transfer functions are faced with high complexity and computational burden so that they cannot be implemented in real-time systems. In this paper, the pole-zero model approximation is examined for the efficient representation of room transfer function. This paper discusses about the optimal number of the pole and zero which minimize the modeling error and the system error norm. With the optimized room model, the interpolation and extrapolation of room transfer function are investigated by observing the movement of poles and zeros in z-plane. Furthermore, systematic analyses of the pole-zero room model are attempted. The optimized pole-zero room model is considered in aspect of its stability and real-time implementation.