| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device of packet loss concealment in VoIP communication which can effectively perform error concealment by waveform duplication of a packet lost in the VoIP voice communication with high accuracy in order to suppress deterioration of call quality in VoIP as much as possible. SOLUTION: When the device detects the packet lost in reception of packets transmitted via an IP network, calculates pitches of frames before and after a lost part in the lost packet (steps S17, S19), calculates pitch fluctuation rate from the pitches of the frames before and after the lost part (a step S21), compares the pitch fluctuation rate with a predetermined threshold (a step S23), when the pitch fluctuation rate is larger than the predetermined threshold as a result of this comparison, executes a regular 2-side PWR(Pitch Waveform Replication) method (a step S25) and when the pitch fluctuation rate is smaller than the predetermined threshold, executes a 2-side PWR method in consideration of the pitch fluctuation rate (a step S27). COPYRIGHT: (C)2005,JPO&NCIPI
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