COURSE-MATERIALS ERRATA ################################################################################ Below is a list of errors (mainly in the textbook and textbook lecture slides) that have been reported by students to date. Some of the bug reports may be from an earlier offering of ELEC 260, if an earlier offering used the same version of some course materials as the current offering. ################################################################################ NOTE: ALL ERRATA BELOW THIS POINT SHOULD BE WITH RESPECT TO THE 2013-09-11 VERSION OF THE TEXTBOOK ################################################################################ ################################################################################ Date: 2013-09-13 Name: Lukas Prusha Description: 2013-09-11 version of textbook p. 27 Example 2.10 In the last two equations of the example, the case "for t > 2" should read "for t \geq 2". ################################################################################ Date: 2013-09-30 Name: Michael Adams Description: 2013-09-11 version of textbook p. 69 Example 3.15 In the 2nd line of the equation following the text "First, we find the impulse response h(t) ...", the "if t > 0" clause should be "if t \geq 0" ################################################################################ Date: 2013-10-08 Name: Bruno Sampaio Pinho Description: 2013-09-11 version of solutions manual: In the solution for E.108 a, the problem asks for a function that takes n and theta as input arguments (in that order) but the function in the solution take the arguments in the wrong order: drawpattern(theta, n) The order should be: drawpattern(n, theta) ################################################################################ Date: 2013-11-09 Name: Michael Adams Description: 2013-09-11 version of textbook: p. 125, Table 5.2 The constants T and B in Fourier transform pairs 8, 9, and 12 must be positive in order for the stated pairs to be correct. This should be made clear in the table. coursepack lecture slides: slide 153 Fourier Transform Pairs The same clarification/correction should be made to the corresponding Fourier transform table in the lecture slides. ################################################################################ Date: 2013-11-20 Name: Michael Adams Description: coursepack lecture slides (p. 255, "Causality") third bullet "right-hand plane" should be "right-half plane" ################################################################################ Date: 2013-12-08 Name: Brody Holden Description: version 2013-09-11 of textbook, page 235, in paragraph just before start of Section A.10: in the following text "AND" should be "are": where $U(x,y)$ and $V(x,y)$ AND both real-valued functions of the two real variables $x$ and $y$, and $z=x+jy$. ################################################################################ Date: 2012-12-09 Name: Cole Peterson Description: version 2013-09-11 of textbook, page 265, section E.5.1 Identifiers: The text reads: "Identifiers (i.e., variable/function names) are case sensitive and may consist of uppercase and lowercase letters, underscores, and digits, but the first character cannot be a digit." This is incorrect, as this would imply that an identifier could start with an underscore. The line should read "... but the first character must be a letter". ################################################################################ Date: 2014-07-30 Name: Cameron Hesse Description: This is a nonserious bug, but it is still a bug of sorts. It's located on the assignment handout, final paragraph of pages #9 & #10. They share a common paragraph. The errors are located on lines 1-5, 10-11. On all but line 4 it says headset. A headset may be used, but it should say probably say headphones. A headset is a pair of headphones that have a microphone attached or built in to them. Not all headphones are headsets, but all headsets are headphones. Lastly, the error on line 4 is that it says to ensure the microphone jack sense is enabled. I assume that it means to say that to ensure the headphone jack sense is enabled as it says on line #8 and #9. My apologies for the nagging about such a small error, but after listening to Handel for 40 minutes trying to determine whether I was able to hear a difference in audio quality with my monitor headphones it seems like something I should bring up. I don't think most headsets could tell probably the most minor of differences between the noisy version and standard. ################################################################################ Date: 2014-09-23 Name: Martin Kellinghusen Description: version 2011-09-11 of textbook, p. 132, Example 5.26: In the equation for arg X(w), the multicase expression does not cover the case of w=0. This case should be added. ################################################################################ Date: 2014-11-18 Name: Helen Roy Description: version 2011-09-11 of textbook: There is a typographical error on Page xxix, paragraph 2, line 6. After "wavelets)" there should be a comma, not a period. ################################################################################ Date: 2014-11-18 Name: Helen Roy Description: There is a typographical error on the lecture slide package's (Version: 2013-09-11) spine. The letters 'a' and 'e' are reversed in "Micheal D. Adams". ################################################################################ Date: 2014-12-08 Name: Jake Cooper Description: In the solutions manual. In the solution for Problem 2.10b: There is no case covering t = -π. The cases should be t >= -π (note the "=" in ">=") and t < -π. ################################################################################ Date: 2015-05-23 Name: Liam Scholte Description: In the textbook, the wording for Problem 2.5(c) is misleading. The text should read something like: The sum of an even signal and odd signal is neither even nor odd, provided that both signals are not identically zero. ################################################################################ Date: 2015-07-04 Name: Charndeep Bhangoo Description: in the lecture slides, slide 36, which is titled "Division": The wording of the second bullet is incorrect. It should be changed to read: That is, to compute the quotient of two complex numbers expressed in Cartesian form, we convert the problem into one of division by a real number. In other words, the word "polar" should be changed to "Cartesian". ################################################################################ Date: 2015-07-04 Name: Cameron McNaught Description: In the textbook, the signum function is not introduced in the logically most sensible place. It is introduced during a discussion of stability. It would be better to introduce this function along with other elementary functions much earlier in the textbook. Also, the signum function could also be introduced in a corresponding place on the lecture slides. ################################################################################ Date: 2015-08-09 Name: Willy Su Yep Description: On page 212, in Example 6.37(b), the second line in the formula for s is wrong. The expression under the square root sign should be a^2 - 4a + 4 instead of a^2 - 4a - 4. ################################################################################ Date: 2015-10-10 Name: Michael Adams Description: On slide 176 titled "Fourier Transform of Periodic Signals (Continued)": The text that reads is produced by sampling x_T should read is produced by sampling X_T ################################################################################ Date: 2015-10-11 Name: Elio Ferri Description: textbook (version 2013-09-11) On page 51, equation number 3.14 is missing the d\tau, specifying the variable of integration. ################################################################################ Date: 2015-10-18 Name: Dave Bernard Description: lecture slides (version 2013-09-11) There are two slides where the convention for a/an + LTI is not followed consistently: * slide titled Frequency Response of LTI Systems * slide titled Memory ################################################################################ Date: 2015-10-18 Name: Dave Bernard Description: textbook (version 2013-09-11) There are several slides where the convention for a/an + LTI is not followed consistently: * p. 61, section titled Interconnection of Continuous-Time LTI Systems * p. 94, section titled Fourier Series and LTI Systems * p. 135, section titled Frequency Response of LTI Systems * p. 206, section titled Invertibility ################################################################################ Date: 2015-11-04 Name: Michael Adams Description: textbook, p. 14 The text The sum of an even signal and odd signal is neither even nor odd. should be worded more precisely as The sum of an even signal and odd signal is neither even nor odd, provided that both signals are not identically zero. ################################################################################ Date: 2015-12-06 Name: Gurjyot Grewal Description: Solutions manual, version 2015-10-25: In the solution to question 2.14 e. There is an extra closing bracket. or two, appearing after the following expression : "t ≤ t0”. ################################################################################ Date: 2015-12-14 Name: Riley Gunn Description: Textbook version 2013-09-11, p. 223, Problem 6.1(c) [and solutions manual]: The indefinite integral in the problem statement should have a constant term added for consistency with other indefinite integrals in the textbook. ################################################################################ Date: 2016-07-23 Name: Rushi Nathvani Description: 2013-09-11 version Page 192, Table 6.1 In "Table 6.1: Laplace Transform Properties", row 4 currently reads "Time/Frequency-Domain Scaling". It should read "Time/Laplace-Domain Scaling". ################################################################################ Date: 2016-07-23 Name: Michael Adams Description: (2013-09-11 version) Page 216, Table 6.3 In Table 6.3, the 3rd row should read "Time/Laplace-Domain Scaling", not "Time/Frequency-Domain Scaling". ################################################################################ Date: 2016-07-23 Name: Michael Adams Description: (2013-09-11 version) Page 216, line line 6 below Table 6.3 The text that reads the time/frequency-domain scaling property should read the time/Laplace-domain scaling property ################################################################################ Date: 2016-09-16 Name: Michael Adams Description: (2013-09-11 version) p. 12, 2nd line after (2.9) The text that reads One can easily show that an odd signal x(t) must be such that x(0) = 0. should be changed to One can easily show that an odd signal x(t) must be such that x(0) = 0 if the domain of x includes 0. ################################################################################ Date: 2017-05-04 Name: Michael Adams Description: p. 232, Section A.5.2 The text that reads That is, for any two complex numbers $z_1$ and $z_2$, we have should be changed to That is, for any three complex numbers $z_1$, $z_2$, and $z_3$, we have ################################################################################ Date: 2017-05-07 Name: Michael Adams Description: p. 239, Section A.15 Zeros and Singularities 4th paragraph, 3rd line: The indices on the \alpha's should go up to M, not N. ################################################################################ Date: 2017-05-19 Name: Jeff Stacey Description: (2013-09-11 version) Table E.14 on page 271 The "finite" function should be called "isfinite". ################################################################################ Date: 2017-06-11 Name: Jerry Yu Description: Appendix E.14.3 Manipulating Symbolic Objects (p 284) The "simple" function in MATLAB is deprecated and should be replaced with "simplify". ################################################################################ Date: 2017-06-11 Name: Michael Adams Description: Example E.25 p. 284 Apparently, on some versions of MATLAB the code given in the textbook does not work. It seems that some versions of MATLAB require the summation index for symsum (i.e., "k" in the case of this example) to be a symbolic variable. Perhaps, the following code may be more portable: syms a d k n; simplify(symsum(a + k * d, k, 0, n - 1)) ################################################################################ Date: 2017-08-09 Name: Tess Carswell (tmrc@uvic.ca) Description: p. 300 In the problem statement for F.51, it should say that all of the subsystems are causal. ################################################################################ Date: 2017-10-11 Name: Yiping Wang (wypbusy@gmail.com) Description: p. 117 of the textbook, at the bottom: The text reads: "let v = w - 入 so that w = v + 入 and dv = d入", but it should instead read: "let v = w - 入 so that w = v + 入 and dv = dw". (i.e., it should say that dv=dw). ################################################################################ Date: 2017-10-25 Name: Yiping Wang Description: page 245, Appendix B. The denominator of the second F(v), should be v^n + bn-1v^n-1 + ..., not v^n + bm-1v^m-1.... ################################################################################ Date: 2017-11-27 Name: Robert Lee On page 213: The following sentence is a run-on sentence: “With the feedback approach, the poles of the system function are not cancelled with zeros, instead the poles are completely changed/relocated.” This should be split into two sentences or a semicolon introduced. ################################################################################ Date: 2017-12-15 Name: Tristan Slater p. 297 of the textbook, Problem F.31: Part (b) of the problem has a typo. The text that reads "(b) X_o(w) = Im{X(w)}." should be changed to "(b) X_o(w) = j Im{X(w)}." ################################################################################ Date: 2018-09-18 Name: Shea Faigan Description: Location: Continuous-Time Signals and Systems (textbook), page 265, E.5.1 Identifiers This paragraph seems to cover all the invalid cases for an identifier, even that the first character cannot be a digit, but it does not mention that the first character cannot be an underscore either. The text should be changed to read something like: Identifiers (i.e., variable/function names) are case sensitive and may consist of uppercase and lowercase letters, underscores, and digits, but the first character cannot be a digit or an underscore. ################################################################################ Date: 2019-05-11 Name: Jesse Farrell Description: I found a small typo in Continuous-Time Signals and Systems // Page 239 // paragraph 1 // "To study of the analyticity of F(Z), ...". The correct rewording being "To study the analyticity of F(Z)....". ################################################################################ Date: 2019-07-08 Name: Scott Lynch Description: In Appendix E of the textbook, the material on the Symbolic Math Toolbox is out of date. Some of the code examples do not work, due to breaking (i.e., non-backward-compatible) changes made to MATLAB in approximately release 2018. ################################################################################ Date: 2019-07-14 Name: Maggie Chan Description: In the solution for Problem 4.2(a) in the textbook, the solution can be simplfied slightly further by observing that the e^{\pm j\pi k/2} can be written as (\pm j)^k. ################################################################################ Date: 2019-07-20 Name: Marcela Arevalo Flores Description: p. 124 of the textbook Another very small error is in page 124 line 16 where there is a parenthesis missing. It currently reads "(as in (5.21)" instead of "​(as in (5.21))". ################################################################################ Date: 2019-09-17 Name: Josh Berryman Description: There was an inconsistency in the slides on slide 63 in chapter 2. It states a <= b but in the piecewise function it shows t < b.  ################################################################################ Date: 2019-10-07 Name: Ty Ricard Description: p. 49, Example 3.3 the last interval for the defintion of x should be ">=" not ">". ################################################################################ Date: 2019-12-16 Name: Josh Morgan Description: the problem statement of F.60 has a typo for h(t). h(t) should be -t-2 not 2-t. ################################################################################ Date: Name: Description: ################################################################################