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

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