2.1 Discrete-time LTI Systems : The Convolution Sum （卷积和） 2.1.1 The Representation of Discrete-Time Signals in Terms of impulses

1. is absolutely summable, 2. has finite energy

Chapter 1 Signals and Systems (1) A simple RC circuit Source voltage Vs and Capacitor voltage Vc (2) An automobile

6.23 Shown in Figure 6.23 is for a lowpass filter. Determine and sketch the impulse response of the filter for each of the following phase characteristics:

4.3 4.4 4.10 4.11 4.14 4.15 4.24 4.25 4.32 4.35 4.36 4.37 4.43

2.7 A linear system S has the relationship +∞ yn]=]gn-2k] k=-∞0 between its input xn] and outputy[n] g[n]=un]-un-4] (a)x[n]=[n-1]y[n=u[n-2]-u[n-6] (b)x[n=6[n-2]yn=u[n-4]-u[n-8 (c)S is time-varying

3.1 3.13 3.15 3.34 3.35

作业： 1.14 1.15 1.16 1.17 1.21 (d) (e) (f) 1.22 (d) (g) 1.23 1.24 (a) (b) 1.26 (a) (b) 1.27 1.31

7-6正弦稳态电路的功率 7-7三相电路 7-8非正弦周期电路的稳态分析

7-1正弦量 7-2正弦量的相量表示法 7-3正弦稳态电路的相量模型 7-4阻抗和导纳 7-5正弦稳态电路的相量分析法