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VOICE CODING DEVICE, VOICE DECODING DEVICE AND THEIR METHODS

  • US 20100017197A1
  • Filed: 11/01/2007
  • Published: 01/21/2010
  • Est. Priority Date: 11/02/2006
  • Status: Abandoned Application
First Claim
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1. A speech coding apparatus comprising:

  • a first layer coding section that encodes components in a lower band of an input speech signal and acquires first layer encoded data, the lower band being lower than a predetermined frequency;

    a deciding section that decides whether or not there are the components in the lower band of the speech signal; and

    a second layer coding section that, if there are the components in the lower band of the speech signal, encodes components in a higher band of the speech signal using the components in the lower band of the speech signal and acquires second layer encoded data, the higher band being equal to or higher than the predetermined frequency, and that, if there are not the components in the lower band of the speech signal, encodes the components in the higher band of the speech signal using a predetermined signal allocated in the lower band of the speech signal and acquires second layer encoded data.

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