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Apparatus for discriminating an audio signal as an ordinary vocal sound or musical sound

  • US 5,298,674 A
  • Filed: 12/03/1991
  • Issued: 03/29/1994
  • Est. Priority Date: 04/12/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus for discriminating an audio signal as one of vocal sound and musical sound, said apparatus comprising:

  • pre-processing means for providing a vocal frequency band signal and a musical frequency band signal by separating said audio signal;

    intermediate decision means, connected to said pre-processing means, for producing a plurality of decision signals respectively indicating whether the audio signal is one of said vocal sound and said musical sound, in response to detection of properties of said audio signal, said intermediate decision means comprising;

    a first decision unit for producing a first decision signal by discriminating said audio signal as said vocal sound when said audio signal is monophonic;

    a second decision unit for producing a second decision signal by desciminating said audio signal as said musical sound when said musical frequency band signal is detected having a sound pressure higher than a predetermined sound pressure;

    a third decision unit for producing a third decision signal by discriminating said audio signal as said vocal sound when an envelope of said vocal frequency band signal is detected having an intermittence lower than a predetermined intermittence; and

    a fourth decision unit for producing a fourth decision signal by discriminating said audio signal as said musical sound when said musical frequency band signal comprises a predetermined bandwidth; and

    final decision means for producing a final decision signal indicating whether said audio signal is said one of said vocal sound and said musical sound by analyzing and comparing said first, second, third and fourth decision signals.

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