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

  • US 9,892,740 B2
  • Filed: 05/09/2017
  • Issued: 02/13/2018
  • Est. Priority Date: 11/05/2012
  • Status: Active Grant
First Claim
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1. A speech/audio coding apparatus, comprising:

  • a receiver that receives a time-domain speech input signal;

    a processor thattransforms a time-domain speech input signal into a frequency-domain spectrum;

    divides a frequency region of the spectrum in an extended band into a plurality of bands;

    sets a limited band for each divided band in the current frame, when a difference between a first frequency with a first maximum amplitude in a spectrum of the divided band in a preceding frame and a second frequency with a second maximum amplitude in a spectrum of the divided band in a current frame is below a threshold, a width of the limited band in the current frame being narrower than the divided band and the limited band including the first frequency; and

    encodes the spectrum in the limited band within each divided band in the current frame, and does not encode a spectrum outside the limited band within each divided band in the current frame.

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