AES Standards News Blog

AES-R16-2016, Report on PTP parameters for AES67 and SMPTE ST 2059-2 interoperability

AES and SMPTE have both specified profiles for IEEE 1588-2008 Precision Time Protocol (PTP) for use in professional media applications; the respective standards being AES67 and SMPTE ST 2059-2. The design goals were somewhat different: the AES standard was aimed at interoperability of some existing networked audio systems and the SMPTE standard at meeting requirements of the EBU/SMPTE Task Force on Timing and Synchronization. Nevertheless, it is clear that there is significant overlap in the application space and that some users will want to use equipment conforming to AES and SMPTE specifications on the same network and in the same PTP domain.

Each standard defines a profile in terms of ranges and recommended default settings for parameters. The requirements of the two standards are not mutually exclusive and this report explores suitable parameter choices for interoperation. The overlapping operating conditions identified in this document are not intended to replace any profile, but rather to identify a common set of parameters and options that satisfy multiple applications.

This document is based on a reading of the two standards and the knowledge that interoperation was a stated development goal for both AES and SMPTE. Further experience with interoperation of these profiles may lead to revisions of this document or one or both of the involved standards.

To obtain a copy of this standard, go to http://www.aes.org/publications/standards/ and search using "AES-R16", or go directly to:

http://www.aes.org/publications/standards/search.cfm?docID=105

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Posted: Monday, May 2, 2016

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AES31-4-2015 XML Implementation of Audio Edit Decision Lists has been published

AES31-4-2015 AES standard for network and file transport of audio - Part 4: XML Implementation of Audio Decision Lists has been published.  

This document provides a syntax mapping for AES31-3 Edit Decision Markup Language (EDML) to XML Schema Language. This facilitates the expansion of the Audio Decision List format to include non-ASCII characters and updates the format facilitating it’s implementation using standard XML parsers and tools. It also supports multi-byte chacter sets for human-readable metadata in all territories worldwide. This document includes both an XML schema definition and an XSLT implementation capable of transforming a conforming XML instance document back to EDML.

AES31-3 was published in 1999 to provide a long-term alternative to proliferating proprietary formats. It provided a convention for expressing edit data in text form in a manner that enabled simple and accurate computer parsing while retaining human readability. It also described a method for expressing time-code information in character notation and simple automation for stereo & surround panning and audio gain. These edit documents were known as Audio Decision Lists (ADL) and used an Edit Decision Markup Language (EDML).

The subsequent growth of XML offers a similar markup facility but with better availability of software tools for faster implementations. XML also offers support for multi-byte characters in human-readable metadata instead of the plain ASCII of EDML, opening implementation to a world-wide user community.

This document was developed from a proposal written by David Ackerman with the assistance of Bruce Gordon at Harvard Library. It was developed in AESSC working group SC-07-01 under project AES-X214.

http://www.aes.org/publications/standards/search.cfm?docID=104

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Posted: Monday, February 8, 2016

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AES42-2010 (r2015) Digital interface for microphones has been reaffirmed

AES42-2010 (r2015) AES standard for acoustics — Digital interface for microphones has been reaffirmed and reissued in a new printing.  

This standard describes an extension of the existing AES3 digital audio interface to provide a digital interface for microphones. 

This standard includes the AES42 system-command set to enable storage and recall of user settings in the microphone itself.

Additionally, since the upload times were not acceptable for a firmware update using the AES42 interface, the bit rate can now be increased. This higher bit rate, called Fast-DPP mode, can be used to transmit DPP commands or firmware update data. It is introduced as an option.

An optional periodic transmission control feature is introduced to allow manufacturer specific command sets for remote control of microphone features.

http://www.aes.org/publications/standards/search.cfm?docID=38

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Posted: Monday, February 8, 2016

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AES70, Audio applications of networks - Open Control Architecture, new publication

AES70-2015 AES standard for audio applications of networks - Open Control Architecture, has been published in three parts.

AES70 defines a scalable control-protocol architecture for professional media networks. AES70 addresses device control and monitoring only; it does not define standards for streaming media transport. However, the Open Control Architecture (OCA) is intended to cooperate with various media transport architectures. 

Part 1: Framework describes the models and mechanisms of the AES70 Open Control Architecture. These models and mechanisms together form the AES70 Framework. This document should be read together with Part 2, Class Structure and Part 3, TCP/IP communications protocol.

Part 2: Class structure specifies the control class structure for AES70 that defines the AES70's control and monitoring functional capabilities and should be read in conjunction with Part 1, Framework, and Part 3, TCP/IP communications protocol. 

Part 3: Protocol for TCP/IP Networks specifies a protocol implementation for TCP/IP networks. It should be read in conjunction with Part 1, Framework, and Part 2, Class Tree. 

To obtain copies of this standard, go to http://www.aes.org/publications/standards/ and search using "AES70", or go directly to:

http://www.aes.org/publications/standards/search.cfm?docID=101

http://www.aes.org/publications/standards/search.cfm?docID=102

http://www.aes.org/publications/standards/search.cfm?docID=103

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Posted: Saturday, January 2, 2016

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AES-R15-2015, Report on AES67 interoperability plugfest, Washington 2015

The standard AES67-2015, a revision of AES67-2013, specifies methods for high-performance streaming audio-over-IP network interoperability.

This report summarizes the AES67 interoperability test event ("plugfest") held at the headquarters of National Public Radio (NPR), Washington DC on 2 to 5 November 2015. Eleven companies tested 13 products against each other to confirm interoperability. The results are presented, together with the results of a range of tests of optional operational modes described in the standard.

The purpose of this interoperability test was to demonstrate functional compatibility - interoperability - between a number of different implementations of the standard AES67-2015, "AES standard for audio applications of networks - High-performance streaming audio-over-IP interoperability".  They were not intended to be exhaustive compliance tests. 

This report follows the same pattern as the AES-R12 report of the 2014 AES67 plugfest, held in Munich. 

To obtain a copy of this standard, go to http://www.aes.org/publications/standards/ and search using "AES-R15", or go directly to:

http://www.aes.org/publications/standards/search.cfm?docID=100

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Posted: Saturday, January 2, 2016

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Call for Comment on REAFFIRMATION of AES42-2010, Digital interface for microphones

 The Call for Comment on REAFFIRMATION of AES42-2010: "AES standard for acoustics - Digital interface for microphones" was published 2015-12-19. 

http://www.aes.org/standards/comments/cfc-reaffirm-aes42-2010-151219.cfm

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Posted: Saturday, December 19, 2015

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Call for Comment on DRAFT AES31-4-xxxx XML Implementation of Audio Decision Lists

 The Call for Comment on DRAFT AES31-4-xxxx, "AES standard for network and file transport of audio - XML Implementation of Audio Decision Lists" was published 2015-12-16.  

http://www.aes.org/standards/comments/cfc-draft-aes31-4-xxxx-151216.cfm

AES31-3 was published in 1999 to provide a long-term alternative to proliferating proprietary formats. It provided a convention for expressing edit data in text form in a manner that enabled simple and accurate computer parsing while retaining human readability. It also described a method for expressing time-code information in character notation and simple automation for stereo & surround panning and audio gain. These edit documents were known as Audio Decision Lists (ADL) and used an Edit Decision Markup Language (EDML).
 
The subsequent growth of XML offers a similar markup facility but with better availability of software tools for faster implementations. XML also offers support for multi-byte characters in human-readable metadata instead of the plain ASCII of EDML, opening implementation to a world-wide user community.
 
AES31-4 sets out a mapping to express EDML as XML as defined by a new XML Schema that closely mirrors the original structure of an Audio Decision List documents as defined in AES31-3. 

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Posted: Wednesday, December 16, 2015

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Call for Comment on DRAFT AES70-3-xxxx - Open Control Architecture - Part 3: Protocol for TCP/IP Networks

The Call for Comment on DRAFT AES70-3-xxxx, "AES standard for audio applications of networks - Open Control Architecture - Part 3: Protocol for TCP/IP Networks" was published 2015-11-12.  

http://www.aes.org/standards/comments/cfc-draft-aes70-3-xxxx-151112.cfm
 
AES70 defines a scalable control-protocol architecture for professional media networks. AES70 addresses device control and monitoring only; it does not define standards for streaming media transport. 
 
AES70 is divided into a number of separate parts. This Part 3 specifies a protocol implementation for TCP/IP networks. It should be read in conjunction with Part 1, Framework, and Part 2, Class Tree. 
 

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Posted: Thursday, November 12, 2015

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Call for Comment on DRAFT AES70-2-xxxx - Open Control Architecture - Part 2: Class structure

The Call for Comment on DRAFT AES70-2-xxxx, "AES standard for audio applications of networks - Open Control Architecture - Part 2: Class structure" was published 2015-11-12.  

http://www.aes.org/standards/comments/cfc-draft-aes70-2-xxxx-151112.cfm  
 
AES70 defines a scalable control-protocol architecture for professional media networks. AES70 addresses device control and monitoring only; it does not define standards for streaming media transport. 
 
AES70 is divided into a number of separate parts. This Part 2 specifies the control class structure that defines the control and monitoring functional capabilities of the standard and should be read in conjunction with Part 1, Framework..
 
 

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Posted: Thursday, November 12, 2015

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Call for Comment on DRAFT AES70-1-xxxx - Open Control Architecture - Part 1: Framework

The Call for Comment on DRAFT AES70-1-xxxx, "AES standard for audio applications of networks - Open Control Architecture - Part 1: Framework" was published 2015-11-12.  

http://www.aes.org/standards/comments/cfc-draft-aes70-1-xxxx-151112.cfm
 
AES70 defines a scalable control-protocol architecture for the control and monitoring of professional media networks. AES70 addresses device control and monitoring only; it does not define standards for transporting streaming media or for describing media content. 
 
This Part 1 describes the models and mechanisms of the AES70 Open Control Architecture. These models and mechanisms together form the AES70 Framework. This document should be read in conjunction with Part 2, Class Structure and Part 3, TCP/IP communications protocol. 

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Posted: Thursday, November 12, 2015

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