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

  • US 9,583,112 B2
  • Filed: 04/11/2011
  • Issued: 02/28/2017
  • Est. Priority Date: 04/13/2010
  • Status: Expired due to Fees
First Claim
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1. A signal processing apparatus comprising:

  • a sub-band division unit that receives an input signal having an arbitrary sampling frequency as an input and produces low band sub-band signals of a plurality of sub-bands on a low band side of the input signal and high band sub-band signals of a plurality of sub-bands on a high band side of the input signal, the sub-bands on the high band side having the number corresponding to the sampling frequency of the input signal;

    a pseudo high band sub-band power calculation unit that calculates pseudo high band sub-band powers, which are estimated values of powers of the high band sub-band signals, for the respective sub-bands on the high band side based on coefficient tables having coefficients for the respective sub-bands on the high band side and the low band sub-band signals, wherein each of the pseudo high band sub-band powers is calculated as a linear combination of a plurality of low band sub-band powers;

    a selection unit that compares high band sub-band powers of the high band sub-band signals and the pseudo high band sub-band powers to each other and selects one of a plurality of the coefficient tables; and

    a production unit that produces data containing coefficient information for obtaining the selected coefficient table.

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