October 11, 2005
PLC
The technique of Packet Loss Concealment (PLC) is used to cover the impact of discarded packets. It is useful in situations where the number of packets lost is less, amounting to not more than 20-30 milliseconds of speech time.
The degradation in voice quality occurs primarily because of bursty packet loss that can go on for several seconds and result in a loss of up to 30% of the conversation.
PLC employs algorithms to either replay the last received packet or generate speech using previously used speech samples. The bandwidth consumption increases with the increase in the sophistication of the algorithms. This reduces the capacity of the gateway.
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