Methods for Avoiding the Checkerboard Distortion Caused by Rounding Error in Multirate System
Hiroaki Iwai, Masahiro Iwahashi, Hitoshi Kiya · ITC-CSCC :International Technical Conference on Circuits Systems, Computers and Communications · 2009
We propose two methods for avoiding the checkerboard distortion which is caused by rounding error under finite word length. In the first method, the bit length of filter taps required for avoiding the checkerboard distortion is derived. In the second method, the cascade structure that consist of zero-hold kernel and time-invariant filter factorized from the filter with structure for avoiding the checkerboard distortion under linear conditions is proposed. It is demonstrated by simulations that we can avoid the checkerboard distortion by using these proposed methods.