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Encoding device and decoding device

  • US 7,139,702 B2
  • Filed: 11/13/2002
  • Issued: 11/21/2006
  • Est. Priority Date: 11/14/2001
  • Status: Active Grant
First Claim
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1. An encoding device that encodes an input signal comprising:

  • a time-frequency transforming unit operable to transform an input signal in a time domain into a frequency spectrum including a lower frequency spectrum;

    a band extending unit operable to generate extension data which specifies a higher frequency spectrum at a higher frequency than the lower frequency spectrum; and

    an encoding unit operable to encode the lower frequency spectrum and the extension data, and output the encoded lower frequency spectrum and extension data,wherein the band extending unit generates a first parameter and a second parameter as the extension data, the first parameter specifying a partial spectrum which is to be copied as the higher frequency spectrum from among a plurality of the partial spectrums which form the lower frequency spectrum, and the second parameter specifying a gain of the partial spectrum after being copied.

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