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Speech audio encoding device, speech audio decoding device, speech audio encoding method, and speech audio decoding method

  • US 10,210,877 B2
  • Filed: 12/20/2017
  • Issued: 02/19/2019
  • Est. Priority Date: 11/05/2012
  • Status: Active Grant
First Claim
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1. A speech/audio decoding apparatus, comprising:

  • a receiver that receives encoded speech/audio data, including a limited-band mode flag;

    a memory that stores information on a position of a maximum amplitude speech/audio spectrum frequency of a previous frame in a divided band; and

    a processor thatidentifies whether a decoding band is encoded using a limited-band mode based on the decoded limited-band mode flag,wherein the limited-band mode is set at an encoder side, when a difference between a first frequency with a first maximum amplitude in a speech/audio spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a speech/audio spectrum of the divided band in a current frame is below a threshold, a width of a limited band in the current frame being narrower than the divided band and the limited band including the first frequency, anddecodes the speech/audio spectrum in the limited band within each of the divided bands in the current frame using the stored information on the position of a maximum amplitude speech/audio spectrum frequency of the previous frame, when the decoding band is identified as the band encoded using the limited-band mode.

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