Mot-clé : Clock

2005

Clock skew is one of the significant issues of real-time networking. We have previously proposed a new algorithm for clock skew detection that operates one a one-way measurement, simply based on time stamped packets. This algorithm was initially targeted to Internet transport context. It has been showed that it is also suitable to low latency transport conditions using an adequate parameters set. This report presents improvements to the algorithm as well as as... read_more

Clock skew is one of the significant issues of real-time networking. We have previously proposed a new algorithm for clock skew detection that operates one a one-way measurement, simply based on time stamped packets. This algorithm was initially targeted to Internet transport context. It has been showed that it is also suitable to low latency transport conditions using an adequate parameters set. This report presents improvements to the algorithm as well as as well as parameters characterization, along with the corresponding performance measurements.

Dominique Fober, Yann Orlarey, Stéphane Letz

Mots-clés :
Clock, Networking, Real, Skew, Time

2002

This paper is the continuation of a previous work done on clock skew compensation over a high latency network. It evaluates the efficiency of the EPTMA clock skew detection algorithm applied to real-time audio streaming over a local network. The presented results include real world apparent deviations of audio card clocks and acuracy of the skew detection. It appears that EPMTA is very suitable to measure clocks deviation in the context of audio transport. Fina... read_more

This paper is the continuation of a previous work done on clock skew compensation over a high latency network. It evaluates the efficiency of the EPTMA clock skew detection algorithm applied to real-time audio streaming over a local network. The presented results include real world apparent deviations of audio card clocks and acuracy of the skew detection. It appears that EPMTA is very suitable to measure clocks deviation in the context of audio transport. Finally, a simple method to compensate for the clock skew is presented, mainly to evaluate a complete solution for audio streaming.

Dominique Fober

Mots-clés :
Audio, Clock, Network, Real-time, Skew

Clock Skew Compensation over a High Latency Network

International Computer Music Conference, 2002, Gothenburg, Sweden. pp.548-552

Exchange of time stamped events between different stations raises the problem of the clock frequencies difference as soon as one station try to compensate for the transmission delay and to render the events with a minimum time distortion. We propose a simple, efficient and low cost method to compensate for the clock frequencies difference. This method rely only on regular time stamped packets transmissions and may be used in many cases. It provides good perform... read_more

Exchange of time stamped events between different stations raises the problem of the clock frequencies difference as soon as one station try to compensate for the transmission delay and to render the events with a minimum time distortion. We propose a simple, efficient and low cost method to compensate for the clock frequencies difference. This method rely only on regular time stamped packets transmissions and may be used in many cases. It provides good performances to the receiver station in regard of the sender reference time even on a heavily loaded communication channel. It operates also very efficiently on a low latency local network

Dominique Fober, Stéphane Letz, Yann Orlarey

Mots-clés :
Clock, Communication, Music, Network, Real-time, Synchronization