AES11
Encyclopedia
The AES11 standard published by the Audio Engineering Society
provides a systematic approach to the synchronization
of digital audio signals. Recommendations are made concerning the accuracy of sample clocks as embodied in the interface signal and the use of this format as a convenient synchronization reference where signals must be rendered co-timed for digital processing. Synchronism is defined, and limits are given which take account of relevant timing uncertainties encountered in an audio studio.
AES11 Annex D (in the November 2005 or later printing or version) shows an example method to provide isochronous
timing relationships for distributed AES3 structures over asynchronous networks such as AES47
where reference signals may be locked to common timing sources such as GPS.
The AES11 standard may be studied by downloading a copy at the AES web site as AES11-2003 with the current version (or printing) dated 2005-11-21.
In addition, the Audio Engineering Society
has now published a related standard called AES53
, that specifies how the timing markers already specified in AES47
may be used to associate an absolute time-stamp with individual audio samples. This may be closely associated with AES11 and used to provide a way of aligning streams from disparate sources, including synchronizing audio to video in networked structures.
Audio Engineering Society
Established in 1948, the Audio Engineering Society draws its membership from amongst engineers, scientists, other individuals with an interest or involvement in the professional audio industry. The membership largely comprises engineers developing devices or products for audio, and persons working...
provides a systematic approach to the synchronization
Synchronization
Synchronization is timekeeping which requires the coordination of events to operate a system in unison. The familiar conductor of an orchestra serves to keep the orchestra in time....
of digital audio signals. Recommendations are made concerning the accuracy of sample clocks as embodied in the interface signal and the use of this format as a convenient synchronization reference where signals must be rendered co-timed for digital processing. Synchronism is defined, and limits are given which take account of relevant timing uncertainties encountered in an audio studio.
AES11 Annex D (in the November 2005 or later printing or version) shows an example method to provide isochronous
Isochronous
Isochronous : From Greek iso, equal + chronos, time. It literally means regularly, or at equal time intervals. In general English language, it refers to something that occurs at a regular interval, of the same duration; as opposed to synchronous which refers to more than one thing happening at the...
timing relationships for distributed AES3 structures over asynchronous networks such as AES47
AES47
AES47 describes a standardised method for packing AES3 professional digital audio streams over Asynchronous Transfer Mode networks. The AES47 method is published by the International Electrotechnical Commission as IEC 62365.-Introduction:...
where reference signals may be locked to common timing sources such as GPS.
The AES11 standard may be studied by downloading a copy at the AES web site as AES11-2003 with the current version (or printing) dated 2005-11-21.
In addition, the Audio Engineering Society
Audio Engineering Society
Established in 1948, the Audio Engineering Society draws its membership from amongst engineers, scientists, other individuals with an interest or involvement in the professional audio industry. The membership largely comprises engineers developing devices or products for audio, and persons working...
has now published a related standard called AES53
AES53
AES53 is a standard first published in October 2006 by the Audio Engineering Society that specifies how the timing markers specified in AES47 may be used to associate an absolute time-stamp with individual audio samples. AES47 specifies a format for the transmission of digital audio over...
, that specifies how the timing markers already specified in AES47
AES47
AES47 describes a standardised method for packing AES3 professional digital audio streams over Asynchronous Transfer Mode networks. The AES47 method is published by the International Electrotechnical Commission as IEC 62365.-Introduction:...
may be used to associate an absolute time-stamp with individual audio samples. This may be closely associated with AES11 and used to provide a way of aligning streams from disparate sources, including synchronizing audio to video in networked structures.