对称特性离散时间系统的信号精确时延方法

A New Method of Signal Precise Time Delay for Symmetric Characteristic System

数字信号的精确时延在信号处理领域有着广泛的应用。从无失真线性传输系统的角度,提出了基于具有对称特性的单位冲击响应的线性移不变系统实现精确时延的方法——SSPD(Symmetric System PreciseDelay)。对于给定的输入序列,选择单位冲击响应为时域有限或频率响应为频域有限的系统,可以实现信号的精确时延。通过时延误差、系统的频率响应并引入总体平均误差参数对其性能进行了分析。实验结果表明,这方法具有时延精度高,实现方便等优点。

The precise delay of digital signal is widely used in the domain of signal processing. Concerning the distortionless linear transmission system,a new method SSPD （Symmetric System Precise Delay） was put forward,which implements the precise time delay through a linear shift invariable system with unit impulse response symmetry. For the given input sequence, precise time delay can be acquired by selecting a system whose impulsion response is limited in time domain or whose frequency response is limited in frequency domain. The comparison of performance was conducted from the time delay error, the system frequency response and whole average error introduced in the paper. The experiment result indicates that the method has the property of high precision in time delay and convenience to implement.