Browsing by Author "Chiang, Yuan-Chuan"

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Joint playout and FEC control for multi-stream voice over IP networks
(2013)
Wu, Chun-Feng
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Chiang, Yuan-Chuan
;
Chang, Wen-Whei
;
傳播研究所
;
Institute of Communication Studies
Packet loss and delay are the major network impairments for transporting real-time voice over internet protocol (IP) networks. In the proposed system, multiple descriptions of the speech are used to take advantage of packet path diversity. A new objective method is presented for predicting the perceived quality of multi-stream voice transmission. Also proposed is a joint playout buffer and forward error control (FEC) adjustment scheme that maximizes the perceived speech quality via delay-loss trading. Experimental results showed that the proposed multi-stream voice transmission scheme achieves significant reductions in delay-and packet-loss rates as well as improved speech quality.
Perceptual-Based Playout Mechanisms for Multi-Stream Voice over IP Networks
(2011-05-01)
Wu, Chun-Feng
;
Chang, Wen-Whei
;
Chiang, Yuan-Chuan
;
電信工程研究所
;
Institute of Communications Engineering
Packet loss and delay are the major network impairments for transporting real-time voice over IP networks. In the proposed system, multiple descriptions of the speech are used to take advantage of the packet path diversity. A new objective method is presented for predicting the perceived quality of multi-stream voice transmission. Also proposed is a multi-stream playout buffer algorithm, together with an adaptive parameter adjustment scheme, that maximizes the perceived speech quality via delay-loss trading. Experimental results showed that, compared to FEC-protected single-path transmission, the proposed multi-stream transmission scheme achieves significant reductions in delay and packet loss rates as well as improved speech quality.