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Sound features extracting apparatus, sound data registering apparatus, sound data retrieving apparatus, and methods and programs for implementing the same

  • US 20020172372A1
  • Filed: 03/20/2002
  • Published: 11/21/2002
  • Est. Priority Date: 03/22/2001
  • Status: Active Grant
First Claim
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1. A sound features extracting apparatus comprising:

  • an audio signal input part which receives an audio signal of sound data;

    a frequency analyzer which analyzes the frequency of each predetermined time frame of said audio signal received from said audio signal input part, and which outputs a signal of each frequency band;

    an interframe variation calculator which calculates a degree of variation between two time frames in said signals of said frequency band received from said frequency analyzer by means of norm calculation; and

    an average calculator which determines an average of said 1.5 interframe variations calculated by said interframe variation calculator over all the frames of said audio signal to be processed, wherein said sound features extracting apparatus calculates a degree of spectrum change which is one of primary features of said audio signal.

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