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1. 发明公开

EP1995978A1 Video quality assessment 有权
标题翻译： Videoqualitätsbestimmung
公开(公告)号：EP1995978A1
公开(公告)日：2008-11-26
申请号：EP07109010.4
申请日：2007-05-25
申请人： Psytechnics Ltd
发明人： Isambart, Marc , Broom, Simon
IPC分类号： H04N17/00
CPC分类号： H04N19/154 , H04N17/004 , H04N19/172 , H04N19/188 , H04N19/61 , H04N19/89
摘要： The present invention relates to the problem of estimating the effect of packet transmission impairments, including packet loss, on the subjective quality of a video transmission where frames of data relating to the same video frame or field are permitted to span more than one packet. The invention provides a method of assessing quality of a video signal comprising a sequence of video frames received via a packet switched network using a parameter which is a weighted sum of two counters where the first counter is incremented in dependence of the total number of packets in frames determined to have been received with one or more lost packets and the second counter is incremented in dependence of the number of packets following the first lost packet in each frame and the lost packet itself.
摘要翻译：本发明涉及估计分组传输损伤（包括分组丢失）对视频传输的主观质量的影响的问题，其中与同一视频帧或场相关的数据帧被允许跨越多于一个分组。本发明提供了一种评估视频信号的质量的方法，该视频信号包括通过分组交换网络接收的视频帧序列，该参数是两个计数器的加权和，其中第一计数器根据总数目的数量递增被确定为已经被接收到一个或多个丢失分组的帧，并且第二计数器依赖于每帧中的第一丢失分组之后的分组数量和丢失分组本身而递增。

2. 发明授权

EP1443497B1 Audio signal quality assessment method 有权
标题翻译：一种用于确定音频信号的质量的方法
公开(公告)号：EP1443497B1
公开(公告)日：2008-03-12
申请号：EP03250361.7
申请日：2003-01-21
申请人： Psytechnics Ltd
发明人： Reynolds, Richard , Broom, Simon , Barrett, Paul
IPC分类号： G10L19/00
CPC分类号： G10L25/69

3. 发明公开

EP1443497A1 Audio signal quality assessment method 有权
标题翻译： Verfahren zurQualitätsbestimmungeines Audiosignals
公开(公告)号：EP1443497A1
公开(公告)日：2004-08-04
申请号：EP03250361.7
申请日：2003-01-21
申请人： Psytechnics Ltd
发明人： Reynolds, Richard , Broom, Simon , Barrett, Paul
IPC分类号： G10L19/00
CPC分类号： G10L25/69
摘要： This invention relates to a non-intrusive speech quality assessment system. The invention provides a method and apparatus for storing a sequence of intercepted packets associated with a call, each packet containing speech data, and an indication of a transmission time of said packet; storing with each intercepted packet an indication of an intercept time of said packet; extracting a set of parameters from said sequence of packets; and generating an estimated mean opinion score in dependence upon said set of parameters; wherein the extracting step comprises the sub steps of: generating a jitter parameter for each of a sequence of stored packets in dependence upon the difference between the transmission time of a stored packet and the transmission time of a preceding stored packet of the sequence; and the difference between the intercept time of said stored packet and the intercept time of said preceding packet; and generating a consecutive positive jitter parameter for said stored packet in dependence upon the polarity of said jitter parameter for said stored packet and the polarity of said jitter parameter for any preceding stored packets.
摘要翻译：本发明涉及非入侵语音质量评估系统。本发明提供了一种用于存储与呼叫相关联的被拦截的分组的序列的方法和装置，每个包含语音数据的分组以及所述分组的传输时间的指示; 与每个截取的分组一起存储所述分组的截取时间的指示; 从所述分组序列中提取一组参数; 以及根据所述一组参数产生估计平均意见得分; 其中所述提取步骤包括以下子步骤：根据存储的分组的传输时间与所述序列的先前存储的分组的传输时间之间的差异，为所存储的分组序列中的每一个生成抖动参数; 以及所述存储分组的截取时间与所述前一分组的截取时间之间的差; 以及根据所述存储的分组的所述抖动参数的极性以及任何先前存储的分组的所述抖动参数的极性，为所述存储的分组生成连续的正抖动参数。

4. 发明授权

EP1995978B1 Video quality assessment 有权
标题翻译：视频质量评估
公开(公告)号：EP1995978B1
公开(公告)日：2010-07-07
申请号：EP07109010.4
申请日：2007-05-25
申请人： Psytechnics Ltd
发明人： Isambart, Marc , Broom, Simon
IPC分类号： H04N17/00
CPC分类号： H04N19/154 , H04N17/004 , H04N19/172 , H04N19/188 , H04N19/61 , H04N19/89

5. 发明授权

EP1441329B1 Audio signal quality assessment method and apparatus 有权
标题翻译：用于确定音频信号的质量的方法和装置
公开(公告)号：EP1441329B1
公开(公告)日：2009-09-09
申请号：EP03250365.8
申请日：2003-01-21
申请人： Psytechnics Ltd
发明人： Reynolds, Richard , Broom, Simon , Barrett, Paul
IPC分类号： G10L19/00
CPC分类号： G10L25/69

6. 发明公开

EP1441329A1 Audio signal quality assessment method and apparatus 有权
标题翻译： Verfahren und Vorrichtung zurQualitätsbestimmungeines Audiosignals
公开(公告)号：EP1441329A1
公开(公告)日：2004-07-28
申请号：EP03250365.8
申请日：2003-01-21
申请人： Psytechnics Ltd
发明人： Reynolds, Richard , Broom, Simon , Barrett, Paul
IPC分类号： G10L19/00
CPC分类号： G10L25/69
摘要： This invention relates to a non-intrusive speech quality assessment system. The invention provides a method and apparatus for storing a sequence of intercepted packets associated with a call each packet containing speech data, and an indication of a transmission time of said packet; storing with each intercepted packet an indication of an intercept time of said packet; extracting a set of parameters from said sequence of packets; and generating an estimated mean opinion score in dependence upon said set of parameters; characterised in that the extracting step comprises the sub steps of: generating a jitter parameter for each of a sequence of stored packets in dependence upon the difference between the transmission time of a stored packet and the transmission time of a preceding stored packet of the sequence; and the difference between the intercept time of said stored packet and the intercept time of said preceding packet; generating a long term average jitter parameter for said stored packet in dependence upon the value of said jitter parameter for said stored packet and the value of said jitter parameter for any preceding stored packets; and generating a differential jitter parameter in dependence upon the jitter parameter and the long term jitter differential parameter.
摘要翻译：本发明涉及非入侵语音质量评估系统。本发明提供了一种用于存储与呼叫相关联的被拦截的分组的序列的方法和装置，每个分组包含语音数据，以及所述分组的传输时间的指示; 与每个截取的分组一起存储所述分组的截取时间的指示; 从所述分组序列中提取一组参数; 以及根据所述一组参数产生估计平均意见得分; 其特征在于，所述提取步骤包括以下子步骤：根据所存储的分组的传输时间与所述序列的先前存储的分组的传输时间之间的差异，为存储分组的序列中的每一个生成抖动参数; 以及所述存储分组的截取时间与所述前一分组的截取时间之间的差; 根据所述存储的分组的所述抖动参数的值和任何先前存储的分组的所述抖动参数的值，为所述存储的分组生成长期平均抖动参数; 以及根据抖动参数和长期抖动差分参数产生差分抖动参数。

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