INTRODUCTION TO DIGITAL FILTERS
WITH AUDIO APPLICATIONS

JULIUS O. SMITH III

2007

Known Errata and Clarifications for Future Editions:

• Page 84: Replace the definition of a signal by the following:

  •   A real discrete-time signal is defined as any time-ordered sequence of
      real numbers.  Similarly, a complex signal is any time-ordered sequence
      of complex numbers.
    

    Mathematically, we typically denote a signal as a real- or complex-valued function of an integer, e.g., x(n), n=0,1,2,.... Thus, x(n) is the nth real (or complex) number in the signal, and n represents time as an integer sample number.
  A real discrete-time signal x(n) was previously defined as any "real-valued function of the integers", but this wording can be interpreted in more than one way.
• Page 319: Last line of text, below Eq. (E.3), after "the current through the inductor coil in Coulombs", insert "per second, or Amperes". In other words, current is in physical units of Coulombs per second, called Amperes.

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