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Method and apparatus for performing packet loss or frame erasure concealment

  • US 8,423,358 B2
  • Filed: 05/21/2012
  • Issued: 04/16/2013
  • Est. Priority Date: 04/19/1999
  • Status: Expired due to Fees
First Claim
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1. A method for creating an output signal in response to determining one or more unexpected packets, where an unexpected packet includes a packet that is lost, corrupted, erased or delayed, and where an expected packet includes a packet that is not lost, corrupted, erased or delayed, the method comprising:

  • generating at least one synthesized audio signal segment corresponding to at least one unexpected packet;

    determining a length of an overlap-add window to use in combining the at least one synthesized audio signal segment with a subsequent audio signal segment resulting from an expected packet being decoded by a receiver, wherein the expected packet is received subsequent to the at least one unexpected packet, wherein the length of the overlap-add window is determined based on a length of an erasure encompassing the at least one unexpected packet; and

    performing an overlap-add operation on the at least one synthesized audio signal segment and the subsequent audio signal segment using the determined length of the overlap-add window.

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