AES Standards News Blog

AES74-2019: AES standard for audio applications of networks — Requirements for Media Network Directories and Directory Services

This document sets forth technical recommendations for media network directories and directory-related services and mechanisms such as network discovery. It is hoped that this document will inform future industry directory and directory services standards that cover at least the following topics:

1. Registration, query, and administration protocols;
2. Security mechanisms;
3. Directory data model;
4. Query language and related semantics; and
5. Scalability strategies.

It remains available for download in the AES Standards Store.

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AES3-1-2009: AES standard for digital audio — Digital input-output interfacing — Serial transmission format for two-channel linearly-represented digital audio data

AES3 provides for the serial digital transmission of two channels of periodically sampled and uniformly quantized audio signals on various media.

— Part 1: Audio Content: specifies the semantics of the audio data, including the "validity" flag. It also specifies the sampling frequency by reference to AES5.

— Part 2: Metadata and Subcode: specifies the information transmitted with the audio data: principally the "channel status" but also user data and the use of the auxiliary bits to carry a co-ordination signal.

— Part 3: Transport: specifies the framing and channel coding for transmission on a unidirectional point-to-point physical link. The specified format minimizes the direct-current (DC) component on the transmission line, facilitates clock recovery from the data stream, and makes the interface insensitive to the polarity of connections.

— Part 4: specifies the physical signals that convey the bit stream specified in Part 3. The current version covers electrical signals on twisted-pair and co-axial cables. Other media, including fibre optic, are under consideration.

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AES31-4-2024 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 is a revision of AES31-4-2015.

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The Call for Comment on DRAFT REVISED AES67-xxxx, "AES standard for audio applications of networks - High-performance streaming audio-over-IP interoperability" was published 2023-12-28. 

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The fall AES Standards Working Group meetings will be held the week of September 1 through October 4.  As has been the case for several years the meetings will be held online using Zoom.  Details and a complete schedule are available on the AES Standards website.  

See the schedule here

AES70 is a suite of standards for control and monitoring of devices in professional media networks. This standard, AES standard for Audio applications of networks - Open control architecture - Part 22: Using AES70 to manage Milan™ media transport defines an application of the Core AES70 specification for managing Milan™ media transport connections, and related synchronization and clocking mechanisms.  Other standards in the AES70 suite specify control and monitoring repertoire, control protocols, and media transport management applications.

AES70 does not specify a media transport scheme. Rather, it is designed to operate with media transport schemes such as the one specified by Milan™.

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The Call for Comment on DRAFT AES70-21-xxxx Audio applications of networks - Open Control Architecture - Part 21: Using AES70 to manage AES67 and SMPTE ST 2110-30 media transport has been published.

The AES70 standard is a suite of standards, classified into two divisions. The Core Standards division, contains standards essential to all implementations of AES70; the Adaptation Standards division contains application-specific standards. This standard, AES standard for audio applications of networks - Open Control Architecture - Part 21: Using AES70 to manage AES67 and SMPTE ST 2110 30 media transport, is an Adaptation Standard.

A media network contains at least four sets of services:

· media transport: synchronized transportation of media data;

· control: controlling devices;

· directory: allowing devices and controllers to identify and discover each other;

· time: enabling media transport synchronization and control action timing.

A key function of the control set is connection management, i.e. control of the making, breaking, and operation of media transport connections and sessions. AES70 contains a rich set of connection management features. This Standard specifies a way of using those features to manage AES67 and SMPTE ST 2110-30 media transport connections and sessions.

Directory and time services are not part of this Standard.

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A reaffirmed version of the following AES standard has been published:

AES56-2008: AES standard on acoustics - Sound source modeling - Loudspeaker polar radiation measurements

This standard describes how the measurements of loudspeaker polar radiation data shall be made and documented. This acquired data is suitable for application in room acoustic, electro-acoustic, and sound system predictions, and loudspeaker data sheets. 

This standard is available for sale now in the AES Standards Store

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A reaffirmed version of the following AES standard has been published:

AES73id-2019:  AES information document for acoustics - Loudspeaker driver comparison chambers

Acoustic performance measurements on loudspeaker drivers that are measured in different sites or with different equipment or methods are subject to variations in accuracy and repeatability. Similarly, end-of-line loudspeaker test systems often utilize small, arbitrarily shaped, driver measurement chambers that do not correlate from line to line, or from site to site. This document is motivated by the need for engineers in different locations to share accurate measurement data on specific or same type loudspeaker drivers and addresses some of the factors affecting repeatability of measurements in different locations.

This standard is available for sale now in the AES Standards Store

Copies may be obtained here

AES70 is a suite of standards for control and monitoring of devices in professional media networks. AES70 does not specify a media transport scheme. Rather, it is designed to operate with media transport schemes such as the one specified by AES67.

AES70's intended range of use spans networks of all sizes. This includes mission-critical applications, high-security applications, IP and non-IP networks, and local and wide-area applications. AES70 can control real or virtual devices located on premises or hosted by cloud services. AES70 consumes little computing power and uses network bandwidth lightly.

AES70 is based on the Open Control Architecture (OCA), originally developed by the OCA Alliance.

AES Standard » AES70-1-2024: AES standard for audio applications of networks - Open Control Architecture - Part 1: Framework

AES Standard » AES70-2-2024: AES standard for audio applications of networks - Open Control Architecture - Part 2: Class structure

AES Standard » AES70-3-2024: AES standard for audio applications of networks - Open Control Architecture - Part 3: OCP.1: Binary protocol

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