ATIS - 0100521
Packet Loss Concealment for Use with ITU-T Recommendation G.711
|Publication Date:||1 March 2005|
This standard describes Packet Loss Concealment algorithms for use in packetized speech transmission systems that use ITU-T Recommendation G.711 to code speech signals. Mechanisms for detecting packet loss are not defined in this standard and will depend on the application.
In 1995, Working Group T1A1.7 (now, PRQC-QOS) published a Technical Report on speech packetization. That Report took note of the importance of packet loss recovery, but made no specific recommendations of how it should be achieved, choosing only to list a number of possible techniques. These included simple techniques such as repeating the previous packet, inserting white noise at the same power level as surrounding packets, or silence substitution.
To provide high-quality speech transmission in packetized systems that use G.711 and in which packet loss may occur, high quality methods for recovering from packet loss are required.