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FREQUENCY BAND EXTENDING DEVICE AND METHOD, ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM

  • US 20120243526A1
  • Filed: 09/29/2010
  • Published: 09/27/2012
  • Est. Priority Date: 10/07/2009
  • Status: Active Grant
First Claim
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1. A frequency band extending device comprising:

  • signal dividing means configured to divide an input signal into a plurality of sub-band signals;

    feature amount calculating means configured to calculate feature amount which expresses a feature of said input signal using at least one of said plurality of sub-band signals divided by said signal dividing means, and said input signal;

    high frequency sub-band power estimating means configured to calculate an estimated value of a high frequency sub-band power that is the power of a sub-band signal having a higher frequency band than said input signal based on said feature amount calculated by said feature amount calculating means; and

    high frequency signal component generating means configured to generate a high frequency signal component based on said plurality of sub-band signals divided by said signal dividing means, and the estimated value of said high frequency sub-band power calculated by said high frequency sub-band power estimating means;

    wherein the frequency band of said input signal is extended using said high frequency signal component generated by said high frequency signal component generating means.

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