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AES Standards News Blog
New project AES-X223, Loudspeaker driver comparison chambers, has been initiated and assigned to working group SC-04-03.
This new project will consider factors affecting the interchangeability of measurement data from simple loudspeaker comparison chambers.
In the manufacture of loudspeaker drivers, a frequent final test places each driver into a relatively-compact test chamber, measures its acoustic response to a set of test signals, and compares them with stored values derived from a reference sample. This does not provide the full performance measurements that would require a full-sized anechoic chamber, however it can identify deviations from the expected performance set by the reference.
Such test chambers are typically built only to meet local needs. As a result, the figures derived from one cannot be compared with figures derived from another.
This report will set out some relevant issues and suggest designs and construction methods to achieve measurement figures that will be comparable between different testing sites.
Posted: Thursday, October 2, 2014
A Call for Comment on REAFFIRMATION of AES14-1992 - AES standard for professional audio equipment — Application of connectors, part 1, XLR-type polarity and gender, was published on 2014-06-11 in accordance with our 5-year review policy.
Posted: Wednesday, June 11, 2014
A Call for Comment on REAFFIRMATION of AES10-2008, AES Recommended Practice for Digital Audio Engineering - Serial Multichannel Audio Digital Interface (MADI), was published on 2014-06-11 in accordance with our 5-year review policy.
Posted: Wednesday, June 11, 2014
New project AES-X214, XML Implementation of ADL, has been initiated and assigned to working group SC-07-01.
This new project will create a set of XML elements and a schema that fully represents AES31-3 ADL documents; and to provide an XSLT style sheet for reformatting the XML document in plain-text EDML format.
AES31-3, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 3: Simple project interchange, was originally pubished in 2001, updated in 2008, and recently reaffirmed. It's scope is, "to provide a convention for expressing edit data in text form in a manner that enables simple and accurate computer parsing while retaining human readability. It also describes a method for expressing time-code information in character notation. It supports common professional audio sampling frequencies, video frame rates, and film framing. This document addresses the core need of the AES31 series of standards in providing a simple but extensible system for passing audio material between systems."
However, EDML is an idiosyncratic format not widely supported, resembling parsed-text edit-decision list formats of earlier years. XML is a widely adopted encoding format which can have format restrictions placed upon it via DTD or schema documents which can aid in instance document validation. Converting EDML into an XML representation opens the use of the documents up to any tool that can parse XML. It also allows for multi-byte encodings such as UTF-8, surpassing the limitation of the ASCII-US encoding of EDML.
Backwards compatibility to EDML may be achieved via a style sheet through an XSLT transformation.
Posted: Thursday, January 30, 2014
A Call for Comment on REAFFIRMATION of AES31-3-2008, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 3: Simple project interchange, was published on 2013-12-14
Posted: Saturday, December 14, 2013
New project AES-X224, Metadata integrity in audio files, has been initiated and assigned to working group SC-07-01.
The project will create a guide for manufacturers of audio hardware, software and computer platforms describing best practices for the management of metadata embedded in audio files.
With increasing use of embedded metadata, consisting of descriptive, technical, rights and more, a corresponding importance and reliance are being placed on it. It is important to recognize the current issues with metadata management within the ecosystem that makes up the audio industry and the way this can affect the reliable communication of metadata.
We look to the photo industry as a great example of metadata management throughout the program chain from originators to aggregators and users of content.
This document would not take a stance on any specific metadata standards or initiatives. Neither does it take a stance on the virtues of using embedded metadata or not. It will simply provide guidance on how to properly manage embedded metadata so that it performs reliably.
Posted: Monday, November 4, 2013
New project AES-X222, New audio data connector, has been initiated and assigned to working group SC-05-02.
The project will specify basic dimensions and application details for two- and four-contact circular connectors including a circumferential shield, used for balanced interconnections of sound system components for professional audio, commercial, recording, broadcast and similar applications, carrying either analog or digital signals.
The professional audio community has been searching for an alternative to the XLR type connector that nowadays is considered bulky. The alternative should exhibit the same robustness, reliability and handling capabilities at a smaller size.
Miniature XLR-type connectors cannot provide the same degree of robustness as XLR-type connectors do, and other small-scale connectors as used in or derived from consumer and IT equipment (USB, for example) cannot meet the robustness requirements of professional applications.
A new connector system is proposed that addresses the key issues indicated above. It consists of a continuous system (that is, two different types for each free and fixed connector). Each connector houses two signal contacts (an extension to 4 contacts is planned) in a housing which incorporates an internal circumferential shield. Like the XLR type the system has a positive locking mechanism.
Posted: Thursday, October 31, 2013
AES67-2013, AES standard for audio applications of networks - High-performance streaming audio-over-IP interoperability, has been published.
This standard defines an interoperability mode for transport of high-performance audio over networks based on the Internet Protocol. For the purposes of the standard, high-performance audio refers to audio with full bandwidth and low noise. These requirements imply linear PCM coding with a sampling frequency of 44,1 kHz and higher and resolution of 16 bits and higher. High performance also implies a low-latency capability compatible with live sound applications. The standard considers latency performance of 10 milliseconds or less. This standard provides comprehensive interoperability recommendations in the areas of synchronization, media clock identification, network transport, encoding and streaming, session description and connection management.
AES standards are available to AES members free of charge as a benefit of membership. Details of AES membership can be found at: http://www.aes.org/membership/
To obtain a copy of this standard, go to http://www.aes.org/publications/standards/ and search using "AES67", or go directly to:
Posted: Wednesday, September 11, 2013
New project AES-X217, Audio Analog-to-Digital Converter Test Method and Performance Specification for Archiving and Preservation Applications, has been initiated and assigned to working group SC-02-01
This project will specify sets of measurement methods and performance criteria to characterize the performance of audio analog-to-digital converters (ADCs) used in archiving and preservation workflows. This standard considers the production of files using the highest-quality ADC devices.
This standard would provide a test method and performance specification to be used by organizations digitizing analog sound recordings for preservation. The quality of the digitization is critically dependent on the quality of the analog-to-digital converter (ADC) that is used.
It is generally understood that commonly-published performance metrics are of little value in selecting or specifying a suitable ADC. AES17 provides test methods for ADCs but no performance requirements.
This project will produce a set of tightly integrated specifications that will provide relevant organizations with the ability to:
b) measure and test ADCs for selection, acquisition and integration into preservation systems;
a) include quality requirements in statements of work to vendors being hired to perform digitizing services;
c) perform routine test and measurement of ADCs being used in digitizing workflows to confirm integrity.
This project also aims to provide test and measurement solutions that are a) cost effective, and b) able to be used by technicians who are not measurement specialists.
Posted: Wednesday, August 21, 2013
The Call for Comment on DRAFT of AES67-xxxx, "AES standard for audio applications of networks - High-performance streaming audio-over-IP interoperability" was published 2013-07-29.
Posted: Monday, July 29, 2013