EE235 Errata
Miscellaneous Errata for Edition 3
p. 267, do not assign problem 5.2(a). The
magnitude restriction on b was not given AND the
solution given in the back of the book is incorrect.
2/28/06
p. 189, Table 4.9, equation (4.17), it should be
Ak - JBk = 2Ck. 11/30/05
p. 249, function bodec, change
the command "mdb=20*log(abs(x))" to
"mdb=20*log10(abs(x))"
4/7/05
p. 344, line 1, change "Appendix B" to "Appendix A"
3/3/05
p. 395, Problem 7.12, change the Z-transform sign to a Laplace-transform sign in
line 1 of this problem.
3/16/04
p. 626,
in the middle part, where it says "The second step is to compute the DFT...,"
change
= 10 + (-j)(-2-j2) + (-1)(-2) + ...
to:
= 10 + (-1)(-2-j2) + (1)(-2) + ...
3/9/04
p. 634, Figure 12.14, change the second branch from
"x[1]+x[3]" to "[x[1]+x[3]]W_4^0," and cross out the
"W_4^0" on the third branch. Also, cross out the x_1[0] on the
bottom of the top branch. 3/11/04
p. 699, equation (13.45), the last term in the numerator
should be b_N, not b_0, and the last term of the denominator should
be a_N, not a_0. 3/11/04
p. 675, problem 12.25, change Y[k] to Y[k] = [8, -2-j2, 0, -2 +j2].
3/17/04
p. 756, the answers to 12.22 (a), (b), and (c) are
incorrect. 3/9/04
The following typos have been found since the fourth printing.
p. 628, 6 lines from bottom and 4 lines from bottom (twice),
change x_0[n] to x_o[n] (change the zero to a small letter o, which
stands for odd). So make 3 changes. 2/28/04
p. 629, 5 lines under equation (12.40), same as above -- change
x_0[n] to x_o[n]. 2/28/04
p. 671, problem 12.6, it needs a restriction a not equal to b. 2/27/04
The following typos were found in 2004 but corrected in the FOURTH printing.
p. 189, Table 4.9, equation (4.18), it should be
2Ck = Ak - j Bk. 1/6/04
p.326, Figure P6.3. The figure for abs(H(w)) should have a -200pi on the
left of the origin. 1/12/04
p. 454, Figure 9.8(c), there should be 3 ellipses on either
side of the graph to show that the pattern runs from -infinity to infinity.
1/8/04
p. 477, equation (9.64)
the sum should go to up n-1, not up to n. 2/3/04
p. 483, Example 9.10, number 6. Line 2, change
"x1[n] | a2" to "x1[n] + a2". Line 3, change "a2y[n]"
to "a2 y2[n]." 1/23/04.
pp. 491-492, Problem 9.27 (b), (c), and (d), in all cases,
change terms like x<0 to x[n]<0. You will need to make
10 changes in total. 1/21/04
p. 510, equation
(10.38), change h[n-k] to h[k] in the last sum.
2/2/04.
p. 514, paragraph 2 of "Classical Method," sentence 2. Change
"If the equations models" to "If the equations model" 1/20/04
p. 541, problem 10.8 graph d, change the 3 to a 2. 1/26/04
p. 541, problem 10.9 (d), the restriction should be |b|>1.
1/28/04
p. 542, problem 10.11(d), change h1[n]=h2[n]=u[n] - u[n-2].
2/1/04
P. 546, problem 10.29(a) should be y[n]-0.7y[n-1]=x[n],
rather than y[n]=0.7y[n-1]=x[n]. 2/3/04
p.582, equation (11.66), change |1| to 1. 2/12/04
p. 582, middle of the page (between equations (11.64) and (11.65)),
change the
ROC to |z|<|a| for the left-sided signal. 2/13/04
p. 584, figure 11.14 (b), the first point on the left has an extra
dot on the x-axis. 2/18/04
p. 671, problem 12.1(b), change "signal" to "signals"
2/20/04
p. 752, the answer to 10.4(a) needs to be multipled by a factor of u[n].
1/27/04
p. 755, answer to problem 11.24, should be labeled (i), (ii), and
(iii) instead of (a), (b), and (c). 2/10/04
The following are typos that are still in the THIRD PRINTING of
the third edition:
p. 451, equation 9.14, delete the "i" in front of the integral.
9/30/03
p. 582, 1/3 way down from the top,
the left-sided time function
-a^n u[-n-1] should have an ROC that is |z|<|a|, not |z|>|a|. 10/1/03
p. 601, Figure 12.1, the vertical axis should be labeled as x[n],
not a[n]. 10/1/03
p. 751, the answer to 9.17 (ii) should be N0=200, not 20.
10/15/03
p. 585, Table 11.5, item 2, the restriction should be
z not equal to 0, if n0 >= 0, or
z not equal to infinity, if n0 < 0.
11/10/03
p. 510, Example 10.6, there are FOUR sums that are indexed
with k, that should be indexed with n. 11/25/03
p. 548,
last sentence of the third paragraph from
the bottom, change "we could start with (11.4)..." to
"we could start with (11.1)." 11/25/03
p. 588, Equation (11.73), Fb(Z) should be Fb(z). 11/25/03
p. 765, index entry for
Z-transform: unilateral should be pages 547-580 instead of
478-508. 11/25/03
p.674. Problem 12.21: A sampling period or sampling frequency is needed
to complete the solution. Assume that the 1024
samples were acquired in 1 second.
12/2/03
p. 604, Table 12.1,
item 6: it should have a restriction of |a|<1 (same as it is in items 4 and 5).
12/9/03
p. 615, next-to-last line, change
"This transform is periodic and is plotted in Figure 12.6." to
"This transform is periodic and the real part of X0(Omega) is plotted in Figure 12.6."
12/9/03
p. 616, the
plot for Xo(Omega) should be labeled as the Re{X(Omega)}. 12/9/03
p. 664. The equation above 12.50 and equations 12.50 and 12.52 should
have the * as a superscript to indicate the complex conjugate. Equation
12.51 should have the * on the line to indicate convolution. (The * needs to be
lowered slightly.)
12/9/03
p. 225: entry #18 of the table, the
Fourier Transform for sinc^2(Tt/2) should have a 2 pi in the numerator.
As of 12/14/03, this is corrected in some 3rd printings, but apparently
not in all. 12/14/03
p. 392 Problem 7.1(b), the numerator should be s, not b. 12/14/03
p. 394 Problem 7.6 (iii),
-5exp(-at)(t-b) should actually be
-5exp(-at)u(t-b). 12/14/03
p. 745, the answer to 5.15(b) should be
(5/(2pi) ) [ sinc(10t - pi/2) + sinc(10t+pi/2) ]
12/14/03
p. 194, Figure P4.11 (b), the pulse should have a label to make
it clear that its width is 1. 12/16/03
p. 604, Table 12.1, entry 10, the DTFT should have sin(OMEGA/2) in the
denominator. (In other words, it's not .5sin(OMEGA).) 12/16/03
p. 744, answer to 4.11(b), the Fourier Series coefficients should be
multiplied by exp^{-j k 3 PI/5} to make up for the time shift. 12/16/03
pp. 487-488,
Problem 9.11, parts (b), (c), and (d). All FIVE sums should be over
n, not k. 12/17/03
p. 546 Problem 10.29 (b), change "input given" to
"excitation x[n] = cos(n) u[n]" 12/18/03
CORRECTIONS SENT TO PRENTICE-HALL HERE
p. 595, Problem 11.17, delete the (a) that appears right
next to 11.17. 12/19/03
SOLUTION MANUAL
p.218. Problem 12.5 (b)
H(OMEGA)=exp(-jOMEGA)(exp(jOMEGA)+2
+exp(-jOMEGA))=exp(-jOMEGA)(2+2cos(OMEGA)). 12/2/03
NOTE -- THE FOLLOWING ERRORS HAVE BEEN CORRECTED IN THE
THIRD PRINTING!
Interactive demos link:
- Lesson 8: Example 1 specifies h(t) as
h(t) = e^(-at)*[u(t-1)-u(t-2)] in equation form, but graphically
and in the question it treats h(t) as e^(-at)*[u(t)-u(t-2)]. (Note: this
example doesn't work in netscape 7.)
This page is maintained by Eve Riskin (riskin@ee.washington.edu).
Last updated on December 18, 2003.