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AES42-2019, AES standard for acoustics — Digital interface for microphones, revision of AES42-2010 has been published

AES42-2019, "AES standard for acoustics – Digital interface for microphones", a revised version of AES42-2010 was published on 2019-11-15.

This standard describes an extension to the existing digital audio interface AES3 to provide a digital interface for microphones.  The current revision fixes minor errors in the tables and allows the use of digitally controlled clocks as an alternative to the traditional analog PLL based approach.

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Posted: Friday, November 15, 2019

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AES Standards establishes a Category A liaison with the IEC

AES Standards establishes a Category A liaison with the IEC

The International Electrotechnical Commission (IEC) has approved the AES as a Category A liaison organization to the IEC Technical Committee 100.  This replaces the previous multiple Category C liaisons AES Standards held with the IEC, one for each of the standards being developed.   

Category A liaisons are reserved for organizations that make an effective contribution to the work of the IEC technical committee or subcommittee that establishes the liaison. Such organizations are given access to all relevant IEC documentation and are invited to IEC meetings. The AES may now nominate experts to participate in TC100 Working Groups.

Category A liaison organizations must be international or broadly based regional organizations, working or interested in similar or related fields. Technical committees and subcommittees receive the full backing of the organization having liaison status for each document in which it is interested.

The AES Standards Committee is excited about this new, more substantive, relationship with the IEC.  In practical terms it should help speed and smooth the adoption of AES Standards by the IEC.  

The AESSC would like to thank Junichi Yoshio for his kind assistance in shepherding the application through the IEC approval process.


Posted: Tuesday, November 12, 2019

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AES-X250 Project to specify measurement of maximum linear peak SPL using noise

AES-X250, a project to specify the measurement of maximum linear peak SPL using noise has bee started.  It will be developed in SC-04-03-A under the direction of chair Merlijn vanVeen. 

The standard will specify a method for measuring the maximum linear peak SPL of a loudspeaker driver or system.  It will use a mathematically derived test signal that effectively emulates the dynamic characteristics of music as a function of frequency as well as its spectral content.

The SC-04-03-A task group will meet at the NY AES Convention to begin development of this standard.  All interested parties are invited to attend.  Interested parties may also join SC-04-03-A and participate remotely via teleconference and receive updates by email.


Posted: Wednesday, October 9, 2019

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Call for Comment on DRAFT AES74-xxxx - AES standard for audio applications of networks - Requirements for Media Network Directories and Directory Services

The Call for Comment on DRAFT AES74-xxxx, "AES standard for audio applications of networks - Requirements for Media Network Directories and Directory Services" was published 2019-10-09.

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.

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Posted: Wednesday, October 9, 2019

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Call for Comment on DRAFT REVISED AES42-xxxx - AES standard for acoustics — Digital interface for microphones

The Call for Comment on DRAFT REVISED AES42-xxxx, "AES standard for acoustics – Digital interface for microphones" was published 2019-09-29.

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

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Posted: Sunday, September 29, 2019

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Agendas for NY Standards Meetings Published

Draft agendas for the Working Group meetings at the 2019 AES NY Convention have been published online.  These provide an overview of the projects and standards to be discussed at the meetings.  

AES Standards meetings are open to all.  Interested parties should plan on attending the meetings in person if possible.  If circumstances prevent this, all meetings will be accessible through GoToMeeting.  Appropriate login information will be emailed to everyone on the AES Standards Committee email list.  If you are not on the list and want to participate in the meetings remotely please contact the Standards Manager for the login information.

The schedule of all Working Group and Task Group meetings is also available online.

Click here for the agendas and schedule


Posted: Sunday, September 29, 2019

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Project to specify shields of 25-way D-type connectors in balanced circuits launched

AES-X249, a project to specify the shield connections of 25-way D-type connectors in balanced circuits, has been started.  It will be developed in SC-05-05 under the direction of chair Anthony Kuzub. 

The standard will specify requirements for, and summarize general considerations relative to, the shielding of 25-way D-type connectors in balanced audio applications, taking into account measures commonly necessary for the preservation of electromagnetic compatibility (EMC) at both audio and radio frequencies.  This standard will not address issues of safety.

The SC-05-05 working group will meet at the NY AES Convention to begin development of this standard.  All interested parties are invited to attend.  Interested parties may also join SC-05-05 and participate remotely via teleconference and receive updates by email.


Posted: Monday, August 26, 2019

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Updated and reaffirmed version of AES56 has been published

An updated and reaffirmed version of AES56-2008: AES standard on acoustics - Sound source modeling - Loudspeaker polar radiation measurements has been published.  It has been updated to conform to the current IEC format. 

It is available now from the AES Standards Store.

Download the new version here


Posted: Monday, August 19, 2019

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AES31-2-2019, AES standard on network and file transfer of audio - File format for transferring digital audio data between systems of different type and manufacture has been published

The Broadcast Wave Format is a file format for audio data. It can be used for the seamless exchange of audio material between (i) different broadcast environments and (ii) equipment based on different computer platforms. 

As well as the audio data, a BWF file (BWFF) contains the minimum information - or metadata - that is considered necessary for all broadcast applications. The Broadcast Wave Format is based on the Microsoft WAVE audio file format. This specification adds a “Broadcast Audio Extension” chunk to the basic WAVE format.

An optional Extended Broadcast Wave Format (BWF-E) file format is designed to be a compatible extension of the Broadcast Wave Format (BWF) for audio file sizes larger than a conventional Wave file. It extends the maximum size capabilities of the RIFF/WAVE format by increasing its address space to 64 bits where necessary. A set of machine-readable loudness metadata is included. 

This revision includes a new annex I to describe a universal 'ubxt' chunk to carry human-readable information in UTF-8 multi-byte characters to support international character sets. This is compatible with EBU v2 broadcast wave files.

The standard is available for sale now on in the AES Standards Store.

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Posted: Monday, July 8, 2019

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

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. 

The standard is available for sale now on in the AES Standards Store.

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Posted: Monday, July 8, 2019

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