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Voice band expander and expansion method, and voice communication apparatus

  • US 20090240489A1
  • Filed: 03/05/2009
  • Published: 09/24/2009
  • Est. Priority Date: 03/19/2008
  • Status: Active Grant
First Claim
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1. A voice band expander for expanding a frequency band of an input voice signal with a frequency spectrum limited to frequencies below an upper limit, the voice band expander comprising:

  • a reduced signal generator for generating, from the input voice signal, a reduced signal with a modified frequency spectrum in which at least one of a frequency spectral envelope and a harmonic structure of the input voice signal is reduced;

    a band expanding signal generator for generating, from the reduced signal, a band expanding signal having a frequency spectrum in a band higher than the upper limit of the limited band of the input voice signal; and

    a band expanded signal generator for combining the input voice signal and the band expanding signal and thereby forming a band expanded signal with an expanded frequency band.

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