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System and method for enhanced artificial bandwidth expansion

  • US 8,712,768 B2
  • Filed: 05/25/2004
  • Issued: 04/29/2014
  • Est. Priority Date: 05/25/2004
  • Status: Active Grant
First Claim
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1. A method for expanding narrowband speech signals to wideband speech signals, the method comprising:

  • determining signal type information from a signal;

    obtaining characteristics for forming an upper band signal using the determined signal type information;

    detecting babble noise in the signal based on a gradient index, enemy information, and a noise level estimate;

    determining signal noise information, wherein the signal noise information is determined based on a far-end signal-to-noise ratio and a near-end signal-to-noise ratio;

    using the determined signal noise information to modify the obtained characteristics for forming the upper band signal; and

    forming the upper band signal using the modified characteristics.

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