Errata

First Printing

• p. xx. In the preface. Third paragraph: "application offrequency-domain methods to collllnunications systems" should read "application of frequency-domain methods to comunications systems".
• p. 31. 4th paragraph: "One of the 64 kilobytes per second ..." should read "One of the 64 kilobits per second ..."
• p. 41. Problem 4. "3ignals" should be "signals".
• p. 79. Last line. The following paragraph (which begins on p. 80) should be merged with the paragraph at the bottom of page 79. As it is, it is too easy to miss the hint for the problem.
• p. 80. Problem 13(c): Missing the last line: "Give the domain, range, and assignment rule for u."
• p. 91, The transition from "play greeting" to "recording" should read "{end greeting}/record".
• p. 93. Line 11 should read "else = {ring, end greeting}".
• p. 116, line 8, "answering a third call" should read "answering a first call".
• p. 131, first equation in example 4.2: "(1,1))" should be "(1,1)" (there is an extra close parenthesis).
• p. 131, figure 4.4: The states in the right machine should be labeled "(0,0)", "(1,0)", "(0,1)" and "(1,1)" rather than "{0,0}", "{1,0}", "{0,1}" and "{1,1}".
• p. 132, table: the inputs below the line "(next state, output) for input" should read "0     1     absent", not "(0,0)     (1,0)     (absent_A, 0)".
• p. 146, the statement before example 4.6 should read: "When a machine with state-determined output is combined with any other state machines in a feedback composition, the resulting composition is also usually well-formed, as illustrated in the next example." I.e., add the word "usually." Such a composition is not always well-formed. Consider for example a machine that always outputs absent. It has state-determined output, but in a feedback loop there is no non-stuttering reaction.
• p. 151, 5/8 of the way down,

  output(s(n), x(n)) = output_A(s(n), (x(n), y₂(n)))

  should read:

  output(s(n), x(n)) = output_A1(s(n), (x(n), y₂(n)))

  That is, the subscript is A1 not A.

• p. 164. Problem 12(a). The last word should be "a" rather than "absent".
• p. 617. Problem 17(f). The matrix multiplication shows a column vector multiplied by a matrix. The order is wrong. The column vector should appear after the matrix.
• p. 644. In the index entry for "power set," 592 should be bold, not 618.