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Signal processing apparatus and signal processing method, encoder and encoding method, decoder and decoding method, and program

  • US 10,546,594 B2
  • Filed: 02/15/2019
  • Issued: 01/28/2020
  • Est. Priority Date: 04/13/2010
  • Status: Active Grant
First Claim
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1. A decoding device, comprising:

  • a demultiplexing circuit configured to demultiplex input encoded data into at least low frequency encoded data and an index indicating an estimating coefficient;

    a low frequency decoding circuit configured to decode said low frequency encoded data to generate a low frequency signal;

    a sub-band dividing circuit configured to divide a band of said low frequency signal into a plurality of low frequency sub-bands to generate a low frequency sub-band signal for each of said plurality of low frequency sub-bands; and

    a generating circuit configured to generate a high frequency signal based on said index and said low frequency sub-band signals,wherein said generating circuit comprises circuitry configured to;

    calculate a plurality of feature amounts, each of which expresses a feature of a respective low frequency sub-band signal;

    calculate, for each of a plurality of high-frequency sub-bands making up a band of said high frequency signal, a high frequency sub-band power by multiplying said feature amount and said estimating coefficient for each of said plurality of high frequency sub-bands and summing said multiplied feature amounts and estimating coefficients; and

    generate said high frequency signal based on said high frequency sub-band powers and said low frequency sub-band signals.

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