Chapter 1 1.1 (a) One dimensional, multichannel, discrete time, and digital. (b) Multi dimensional, single channel, continuous-time, analog. (c) One dimensional, single channel, continuous-time, analog. (d) One dimensional, single channel, continuous-time, analog. (e) One dimensional, multichannel, discrete-time, digital. 3 Copyright © 2022 Pearson Education, Inc. 4 Copyright © 2022 Pearson Education, Inc. Chapter 2 2.1 (a) x(n) = ... 0, 1 3 , 2 3 , 1 ↑ , 1, 1, 1, 0,... . Refer to fig 2.1-1. (b) After folding s(n) we have -3 -2 -1 012 3 4 1111 1/3 2/3 Figure 2.1-1: x(−n) = ... 0, 1, 1, 1, 1 ↑ , 2 3 , 1 3 , 0,... . After delaying the folded signal by 4 samples, we have x(−n + 4) = ... 0, 0 ↑ , 1, 1, 1, 1, 2 3 , 1 3 , 0,... . On the other hand, if we delay x(n) by 4 samples we have x(n − 4) = ... 0 ↑ , 0, 1 3 , 2 3 , 1, 1, 1, 1, 0,... . Now, if we fold x(n − 4) we have x(−n − 4) = ... 0, 1, 1, 1, 1, 2 3 , 1 3 , 0, 0 ↑ ,... 5 Copyright © 2022 Pearson Education, Inc.