中文摘要：

实时语音经不可靠网络传输时会遭遇丢包现象,导致语音质量的下降。提出了个新的分布式子帧交织方案,用于多描述语音编码中。它在两个相邻的语音帧间进行分布式子帧交织,以生成两个相关的描述;每一个描述能提供可接受的语音质量。文中方案的性能通过客观音质评价指标PESQ来评估,实验结果证明本方案适用于不可靠和带宽有限的分组网络,发生丢包时可避免重传,并保证可接受的语音质量。

英文摘要：

Packets carrying real-time speech data may be lost during transmission over unreliable networks.This loss could lead to considerable degradation of speech quality.In this paper,a new distributed subframe interleaving scheme for multiple description speech coding is proposed,thus to avoid repeat transmission and ensure acceptable speech quality when packet loss occurs.With the introduction of distributed subframe interleaving operated on two adjacent speech frames,the proposed scheme creates two correlative descriptions,each offers an acceptable quality,and each could be partially restored from the other.The performance of the proposed scheme is evaluated by the objective speech quality measurement PESQ.Experimental results indicate that this scheme is suitable to unreliable and bandwidth-limited packet networks.