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ENCODING DEVICE AND METHOD, DECODING DEVICE AND METHOD, AND PROGRAM

  • US 20130208902A1
  • Filed: 10/05/2011
  • Published: 08/15/2013
  • Est. Priority Date: 10/15/2010
  • Status: Active Grant
First Claim
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1. An encoding device comprising:

  • subband diving means configured to divide an input signal into a plurality of subbands, and to generate a low-frequency subband signal made up of a plurality of subbands on the low-frequency side, and a high-frequency subband signal made up of a plurality of subbands on the high-frequency side;

    feature amount calculating means configured to calculate feature amount that represents features of the input signal based on at least any one of the low-frequency subband signal and the input signal;

    smoothing means configured to subject the feature amount smoothing;

    pseudo high-frequency subband power calculating means configured to calculate pseudo high-frequency subband power that is an estimated value of power of the high-frequency subband signal based on the smoothed feature amount and a predetermined coefficient;

    selecting means configured to calculate high-frequency subband power that is power of the high-frequency subband signal from the high-frequency subband signal, and to compare the high-frequency subband power and the pseudo high-frequency subband rower to select any of a plurality of the coefficients;

    high-frequency encoding means configured to encode coefficient information for obtaining the selected coefficient, and smoothing information relating to the smoothing to generate high-frequency encoded data;

    low-frequency encoding means configured to encode a low-frequency signal that is a low-frequency signal of the input signal to generate low-frequency encoded data; and

    multiplexing means configured to multiplex the low-frequency encoded data and the high-frequency encoded data to obtain an output code string.

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