LTI o o LTI o LTI systems can

线性时不变(LTI)系统 o 最基本、最重要的一种系统，用常系数线性微分方 程描述。 o LTI系统具有完整有效的理论基础，在信号处理中 有重要用途。 o LTI systems can model a wide range of actual systems – For example: electronic circuits, communication systems, control systems, images and video, acoustics. – Including non-engineering ones: mortgage compounding. o A basic fact: If we know the response of an LTI system to some inputs, we actually know the response to many inputs.

微分运算的作用 微分 Edge enhancement