Memory optimization packet loss concealment in a voice over packet network
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United States of America Patent
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Sep 15, 2009
Grant Date -
Aug 17, 2006
app pub date -
Feb 14, 2005
filing date -
Feb 14, 2005
priority date (Note) -
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Abstract
A method to reduce memory requirements for a packet loss concealment algorithm in the event of packet loss in a receiver of pulse code modulated voice signals. A voice playout unit in the receiver shares its nominal delay buffer with a history buffer of a packet loss concealment algorithm up to a maximum limit described in a standard. This reduces or eliminates need to allocate memory for the history buffer. A history buffer can also be extended to retain an original portion of voice signal packets received prior to a packet loss as well as generated voice signals as they are generated. A scratch buffer is used as a working buffer and replaces the function of a pitch buffer.
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