关键词: 无失真传输系统, 精确时延, 分数时延滤波器, 线性加权

Abstract: The accurate delay of digital signal is widely used in the domain of signal processing，it is more important that the implementation of real data series in project.From the view of none distortion linear system，the paper presents a new method which based on linear shift invariable system implements the accurate time delay，meanwhile its performance analyses and the issues in project application are given.Based on the relationship between signal’s time domain and its the authors presents the implementation of linear phase weighting method in frequency domain.In the end，the paper carried out the comparison of performance from the time delay error，the system frequency response and whole average error which the paper introduced.The experiment result indicates that these methods have the property of high precision in time delay and convenience to implement.

Key words: none distortion linear system, accurate time delay, fractional time delay filter, linear phase weighting