Text ---- p. 34: In the gray box at the top of the page, arctan(-1/sqrt(3)) should be -pi/6, not -pi/3. p. 46: the definition of memory should say that a system has memory if its output signal depends on past and/or future values of the input signal. This change would make the definition on page 46 consistent with the one on page 98, where it's stated that a memoryless system has an impulse response that is a scaled impulse, C*delta(t) or C*delta[n]. p. 160: The top equation on the page, right hand side when k is not equal to m, should replace "k" with "(k - m)". The text should then read: "Now use e^(-j*(k-m)*2*pi) = 1 (since (k-m) is an integer) to obtain:" p. 167: Figure 3.5: The index for n=5 is mislabeled as n=-5. p. 197: Table 3.2: The DTFT synthesis equation is missing an e^(j*Omega*n) in the integrand. p. 286, Figure 4.21a: The center triangular pulse goes to zero at (+/- 2*pi/3), not (W/2*pi). p. 287, Figure 4.22: In b, the amplitude should be 4*pi. In c) the amplitude should be pi. In c) the first labeled frequency from the origin should be +/- 2*pi. p. 302, figure 4.37: the block marked "Sample and Hold" should be labeled "Zero-Order Hold". p. 374, Figure 5.22: Where H(jw) goes negative, there should be a phase shift of pi in the phase spectrum plotted in part c) p. 411, when applying Eqn. 6.17, note that for n=1, the right hand side should yield two terms, for n=2, three terms, and for n=3, four terms. p. 412, first paragraph should read: The initial value theorem does not apply to rational functions X(s) whose numerator polynomial order is greater than *or equal to* the denominator polynomial order. page 427, example 6.13. The transfer function Y(s) corresponds to y(t) = e-2t*u(t) - e-3t*u(t) page 432, paragraph 1, the final sentence should read: "If a pole lies to the *left* of the jw-axis, then the right-sided inverse transform is chosen. If it lies to the *right* of the jw-axis, then the left-sided inverse transform is chosen." p. 464, paragraph 2: "Suppose we can bound |x[n]| by finding the smallest positive constants A-, A+ and r+, and the *largest* positive constant r- such that..." page 474, first full paragraph: in each of the two Z transform pairs, a factor z^-1 is missing on the right hand side (denominator should be (1-d_i*z^-1)). page 685, Table D.2: Laplace transform properties. For x(at), the ROC is Rx/a, not Rx/|a|. -------------------------------------------------------------------------------- MATLAB Sections in Text and MATLAB Exercises -------------------------------------------- p. 55: under Periodic Signals: a. The parameter rho is the percent of each period for which the square wave is positive, not the fraction of each period. b. The basic command for generating a square wave should read: A*square(w0*t, rho); c. In the script to draw the square wave, two lines should be changed: rho = 50; sq = A*square(w0*t, rho); d. The basic command for generating a sawtooth or triangle wave should read: A*sawtooth(w0*t, W); e. In the script to draw the triangle wave, one line should be changed: tri = A*sawtooth(w0*t, W); ------------------------------------------------------------------------------- Homework Problems ----------------- 1.26: the integral should equal -f'(t_0). 2.3: In Figure P2.3, in the graph of f[n], the top half of the y axis should be labeled with 2 and 4. 2.9: In Figure P2.9c, the output should be y(t). 2.18c: The difference equation should read y[n] - (1/4)y[n-1] -(1/8)y[n-2] = x[n] + x[n-1] 4.30a: The hint is that h_1(t) = 1/T(h_o(t) * h_o(t))