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Loss tolerant speech decoder for telecommunications

  • US 5,907,822 A
  • Filed: 04/04/1997
  • Issued: 05/25/1999
  • Est. Priority Date: 04/04/1997
  • Status: Expired due to Fees
First Claim
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1. A loss-tolerant speech decoder that receives speech frame parameters according to a speech compression algorithm, said decoder comprising:

  • a frame error detector, said frame error detector capable of discriminating between properly received speech frame parameters and parameters that are lost or corrupted, said frame error detector further capable of issuing a signal upon receipt of lost or corrupted speech frame parameters,a parameter decoder, said parameter decoder capable of decoding said received speech frame parameters to make decoded speech frames,a buffer, said buffer used to store a history of said decoded speech frames received by said buffer from said parameter decoder,a speech filter, said speech filter capable of generating replacement speech frame parameters that are written to said parameter decoder upon issuance of said signal from said frame error code detector upon receipt of a lost or corrupted speech frame,wherein said replacement speech frame parameters take the place of lost or corrupted speech frame parameters received by said decoder in order to conceal said lost or corrupted speech frame parameters.

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