数字信号处理系统随着各方面的需求,日益增多。对系统的功能要求日益复杂。一个系统会有许多不同功能的部分组成。为了使系统安全可靠的工作,系统的各部分必须有自动检测的功能,最好是实时检测,当某一部分工作不正常时能自动发出告警。因此,自检功能对系统设计是一个不可缺少的部分。但是,自检的电路本身应该尽量简单,不能影响系统的工作。本文就有限脉冲响应(FIR)数字滤波器的自动检测提出一个快速的频响测试方法。通过频响测试,不仅了解各个线路的工作是否正常,而且还给出滤波器的频 Digital signal processing system with all aspects of demand, increasing. The system’s functional requirements are increasingly complex. A system will have many different parts of the composition. In order to make the system safe and reliable work, each part of the system must have automatic detection function, it is best to detect in real time, when a certain part of the work is not normal, it can automatically send an alarm. Therefore, the self-test function is an indispensable part of system design. However, the self-test circuit itself should be as simple as possible without affecting the system’s operation. This paper presents a fast frequency response test method for the automatic detection of finite impulse response (FIR) digital filters. Through the frequency response test, not only to understand the work of each line is normal, but also gives the filter frequency