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Spectral Audio Signal Processing
    Notation
       Frequency and Time

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Frequency and Time

  • $ \omega$ denotes continuous radian frequency (rad/sec)
  • $ f$ denotes continuous frequency in Hertz (Hz)
  • $ \omega = 2\pi f$
  • $ \omega_k$ denotes discrete frequency, $ \omega_k = 2\pi (k/N) f_s$
  • $ \omega, \omega_k \in {\bf R}$ (frequencies are always real)
  • $ T = $ sampling interval (sec)
  • $ f_s = $ sampling rate, $ f_s=\frac{1}{T}$
  • $ t_n = nT $ (discrete time)
  • $ n,k \in {\bf Z}$ (integers)
  • $ t,t_n \in {\bf R}$ (time is always real)

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written by Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.


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