信号与系统 奥本海姆 第二版中文版 信号与系统入门书籍，介绍了连续信号离散信号的基本性质以及傅里叶变换拉普拉斯变换z变换等有用的工具 翻译错误较少。-Signals and Systems Oppenheim Chinese version of the second edition of Introduction to Signals and Systems books, describes the continuous signal and discrete signals, the F