标题： 感知评估播放缓冲区算法以提高IP网络语音传输的感知质量 显示英文标题

标题： Perceptual Evaluation Of Playout Buffer Algorithm For Enhancing Perceived Quality Of Voice Transmission Over Ip Network

摘要： 语音互联网协议（VoIP）是一种技术，允许您使用宽带互联网连接而不是普通（或模拟）电话线进行语音通话。 语音互联网协议（VoIP）使人类语音达到了一个新的水平，使得跨大陆的对话可以更加便宜和快速。 然而，由于IP网络并非为实时应用而设计，网络缺陷如数据包丢失、抖动和延迟对语音质量有严重影响。 接收端的播放缓冲区用于在延迟和丢失之间进行权衡以补偿抖动。 我们发现延迟和丢失的特性取决于IP网络，突然的可变延迟（尖峰）通常表现出常规和不规则的特性。 不同的播放缓冲区算法会对语音质量的实现产生不同的影响。 设计一种能够帮助实现最佳语音质量的播放缓冲区算法非常重要。 在本文中，我们研究了网络缺陷和现有自适应缓冲区算法如何影响语音质量，并进一步设计了一种改进的缓冲区算法以获得优化的语音质量。 我们对现有算法进行了实验，并在不同网络条件下（高和低网络延迟变化）比较了它们的性能。 初步结果表明，新算法可以在大多数网络条件下提高感知到的语音质量，并且在实际缓冲机制中更高效和适用。 显示英文摘要

摘要： Voice over Internet Protocol (VoIP) is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. Voice over Internet Protocol (VoIP) has led human speech to a new level, where conversation across continents can be much cheaper & faster. However, as IP networks are not designed for real-time applications, the network impairments such as packet loss, jitter and delay have a severe impact on speech quality. The playout buffer at the receiver side is used to compensate jitter at a trade-off of delay and loss. We found the characteristics of delay and loss are dependent on IP network and sudden variable delay (spike) often performs both regular and irregular characteristics. Different playout buffer algorithms can have different impacts on the achievement speech quality. It is important to design a playout buffer algorithm which can help achieve an optimum speech quality. In this paper, we investigate to the understanding how network impairments and existing adaptive buffer algorithms affect the speech quality and further to design a modified buffer algorithm to obtain an optimized voice quality. We conduct experiments to existing algorithms and compared their performance under different network conditions with high and low network delay variations. Preliminary results show that the new algorithm can enhance the perceived speech quality in most network conditions and it is more efficient and suitable for real buffer mechanism.