TEXTBOOK AND LECTURE-SLIDE ERRATA
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This document contains errata for the following textbook and lecture slides:

    M. D. Adams,
    Signals and Systems (Edition 5.0)
    Dec. 2022.

    M. D. Adams,
    Lecture Slides for Signals and Systems (Edition 5.0)
    Dec. 2022.

Below is a list of errors that have been reported to date.

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Date: 2023-06-04
Name: Jaylan Hamad
Description:

textbook, page 114, answer key for 4.108(d):

In the answer key, the "=" should be "<=".

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Date: 2023-07-12
Name: Huss Chaudhry
Description:

textbook, p. 333, Section 8.3.1
The text
    The product of an even sequences and an odd sequences is odd.
should read
    The product of an even sequence and an odd sequence is odd.

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Date: 2023-07-12
Name: Huss Chaudhry
Description:

textbook, p. 336, Section 8.3.2, just before Theorem 8.2:
The text
    Having introduced the LCM, we know consider
should read
    Having introduced the LCM, we now consider

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Date: 2023-07-26
Name: Jaylan Hamad
Description:

textbook, p. 427, answer key for Exercise 7.113(e)
The formula for H(s) is incorrect.
It should be:
    H(s) = \frac{LCs^2}{LCs^2+RCs+1}

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Date: 2023-07-27
Name: Ivan Denyssevych
Description:

textbook, p. 425, 1st paragraph, last sentence:
The text
    The quantity argck is also important because its affects how much
    different complex sinusoids in the Fourier series are time-shifted
    relative to one another before being added together.
should be changed to
    The quantity argck is also important because it affects how much
    different complex sinusoids in the Fourier series are time-shifted
    relative to one another before being added together.

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Date: 2023-07-27
Name: Ivan Denyssevych
Description:

textbook, p. 101, Section 4.10, 1st paragraph, 1st sentence:
“to notion” should be “to the notion”
That is,
    Earlier, in Section 3.8.7, we were introduced to notion of
    eigenfunctions of systems.
should be
    Earlier, in Section 3.8.7, we were introduced to the notion of
    eigenfunctions of systems.

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Date: 2023-07-27
Name: Michael Adams
Description:

textbook, p. 393, Section 9.10, 1st paragraph, 1st sentence
"introduced to notion"
should be
"introduced to the notion"

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Date: 2023-09-11
Name: Miles Rose
Description:

textbook, p. 9, end of 3rd paragraph:
"this type notational abuse does not usually lead to problems in most
cases"
should be
"this type of notational abuse does not usually lead to problems in most
cases"

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Date: 2023-11-20
Name: Tara Golonka
Description:

textbook, p. 255, Figure 7.15
The content of Figure 7.15 is a table not a figure.
So, it should be captioned as a table, not a figure.

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Date: 2023-11-20
Name: Tara Golonka
Description:

textbook, p. 524, Figure 12.4
The caption for the figure is missing a period at the end.

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Date: 2023-11-30
Name: William Shaw
Description:

textbook, p. 321, Exercise 7.107(f)
The ROC of X makes no sense, due to a typo.
The ROC should be -1 < Re(s) < 1.
That is, the second "-1" should be "1".

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Date: 2023-12-01
Name: Jacob Arychuk
Description:

solutions manual, p. 390
solution for Exercise 7.16(a)
In the last approximately six lines of the solution, several values of "3/5"
should instead be "-3/5".
That is, some minus signs are missing.

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Date: 2024-05-25
Name: Thomas Cool
Description:

textbook, p. 71
The answer key entry for Exercise 3.103(d) has two typos.
The inequalities
1 < t < 2
and
2 < t < 3
should respectively be changed to
1 \leq t < 2
and
2 < t \leq 3
That is, two "<" symbols should be "<=" synbols.

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Date: 2024-06-18
Name: Khephren Gould
Description:

The last line in the solution to Exercise 5.3 b is missing a factor of 4.

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Date: 2024-06-25
Name: Pieter Barnard
Description:

solutions manual
answer for Exercise 5.102(m)
The two summations in the calculation of c_k use a summation index called "k"
but this conflicts with the k already used in the equation for c_k.
So, these conflicting k's should be changed to a different (unused)
symbol like \ell.

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Date: 2024-07-04
Name: Thomas Cool
Description:

solutions manual
answer for Exercise 6.118(c)
On the line just before the text "Taking the inverse Fourier transform...",
a right parenthesis is missing immediate preceding the "- 1/3".

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Date: 2024-07-15
Name: Thomas Cool
Description:

textbook, p. 238, Exercise 6.118(b)
The start of the question for part (b) that reads
  H(\omega) = ...
should instead read
  h(t) = ...

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Date: 2024-07-31
Name: Jasper Halvorson
Description:

solution manual, Exercise 11.5(b)
The final answer is missing a factor of 2.
Also, the case of n=0 needs to be handled as a special case, which
trivially results in x(0) = 0.

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Date: 2024-11-29
Name: Michael Adams
Description:

solution manual, Exercise 7.5(d)
A factor of s was lost part way through the simplification of the formula
for Y(s).  Therefore, the final answer is missing this factor.
Also, the expression for Y(s) can be simplified slightly more.
The final expression for Y(s) should be
Y(s) = s e^{-3s} X^*(s^*).

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Date:
Name:
Description:

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