Method for recovering frame erasure at voice over internet protocol (VoIP) environment

摘要

A method for recovering a frame erasure at a voice over internet protocol (VoIP) environment is provided. The method includes: extracting coder parameters of received packets; if an erased packet exists during the extracting of the coder parameters, regenerating speech characteristic parameters of the erased packet by referencing a vector quantization codebook index interpolation table (VCIIT) formulated based on representative values of speech characteristic parameters reflecting auditory recognition characteristics and performing a linear interpolation on speech characteristic parameters of the normally received packets allocated previous and future of the erased packet; and recovering the erased packet by combining the regenerated speech characteristic parameters. The proposed frame erasure recovery method can minimize an additional delay and increases in bandwidth and computation and improve a capability of recovering the erasure. Also, the frame erasure recovery method can be easily implemented to a VoIP system.