Design and Implmentation of Forward Error Correction on Voice over IP System

• Main Authors: Chiung-Shuan Lee, 李穹軒
• Other Authors: 李肇林
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/11170752194228207815

碩士 === 國立臺灣大學 === 資訊工程學研究所 === 94 === A number of network applications have been used widely using RTP/UDP transport to deliver continuous media streams. Due to the unreliable property of RTP/UDP packet delivery, the quality of the streaming service will be adversely damaged by packet loss. In order to overcome this problem, forward error correction mechanism is proposed to be applied into the RTP/UDP network transmission applications. This paper proposes a method to apply FEC to a VoIP System, and thus can guarantee the quality of service under unreliable transmission channel. This paper also creates a FEC-based Dynamic Jitter Buffer which is used to compensate for delay jitter or lost packets. Using the FEC-based Dynamic De-jitter buffer mechanism enables one VoIP System to guarantee the quality of voice service and applies much lower bit-rate codecs to decrease the transmission bandwidth.