7,179,980 Automatic extraction of musical portions of an audio stream
  Issued: February 20, 2007
  Filed: December 12, 2003
  U.S. Class: 84/600
Abstract:  Music and non-music portions in an audio stream are identified. The audio stream is digitized and segmented into frames. Selected frames are passed through a filter bank which includes filters having bandwidths approximately proportional to their center frequencies. The spectral flux for each selected frame is calculated and smoothed. Frames having a smoothed spectral flux below a threshold value are associated with music, and frames having a smoothed spectral flux above a threshold value are associated with non-music.

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