Psychometric analysis of the effect of buffering control on user-level QoS in an interactive audio--visual application
Psychometric analysis of the effect of buffering control on user-level QoS in an interactive audio--visual application
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交互式视听应用中缓冲控制对用户级 QoS 影响的心理测量分析
DOI：
10.1145/1026763.1026766
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Yoshihiko Fukuta
中科院分区：
文献类型：
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作者：
Yoshihiro Ito;S. Tasaka;Yoshihiko Fukuta
本文研究了互联网上交互式视听应用程序在保真度和时延之间的主观权衡。在音视频传输中，包的时延抖动干扰了音视频传输的时间结构。保真度意味着时间结构被保存的准确程度。可以通过播放缓冲来改善保真度的降级。较长的缓存时间可以抑制较大时延抖动带来的干扰，但会增加时延，即端到端时延，即时延。发送方生成媒体的时间与接收方输出媒体的时间之间的时间差。延迟的增加降低了用户之间的互动性。在交互式视听应用中，保真度的降低和延迟的增加降低了用户级的服务质量。然而，通过改变缓冲时间，我们可以提高保真度或延迟。这意味着缓冲控制导致在保真度和延迟之间的主观折衷。因此，我们必须研究一种设置合适的缓冲时间的方法。本文研究了在交互式视听应用中缓冲时间对用户级服务质量的影响。为了定量评估用户级的服务质量，我们采用了心理测量学的方法。通过实验，我们找到了实验环境中初始缓冲时间的一个合适的值。
This paper studies subjective tradeoff between fidelity and latency in an interactive audio--visual application over the Internet. In audio--video transmission, its temporal structure is disturbed by delay jitter of packets. The fidelity means how exactly the temporal structure is preserved. The degradation in the fidelity can be improved by playout buffer. Longer buffering time can suppress the disturbance caused by larger delay jitter, while it increases the latency, which is end--to--end delay, that is, latency. the difference between the time when media are generated at the sender and the time when the media are output at the receiver. The increase of the latency degrades the interactivity between users. The decrease of the fidelity and the increase of the latency degrade user--level QoS in interactive audio--visual applications. However, by changing the buffering time, we can improve either the fidelity or the latency. This means that the buffering control causes subjective tradeoff between the fidelity and the latency. Therefore, we must investigate a way of setting appropriate buffering time. In this paper, we study the effect of buffering time on user--level QoS in an interactive audio--visual application. In order to assess the user--level QoS quantitatively, we adopt psychometric methods. By experiment, we find an appropriate value of the initial buffering time in our experimental environment.
用户级QoS的定量评估及其映射
DOI：
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发表时间：
2005
期刊：
IEEE Transaction on Multimedia 7
影响因子：
--
作者：
南 正輝;森川 博之;青山 友紀;Yoshihiro Ito
通讯作者：
Yoshihiro Ito
多媒体QoS的相互补偿特性
DOI：
--
发表时间：
2002
期刊：
Conference Record of IEEE ICC2002
影响因子：
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作者：
Toshiki Endo;Shuji Tasaka
通讯作者：
Shuji Tasaka