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AES31-3-2020 has been published, revised version of AES31-3-2008

This standard provides 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. 

The SMPTE Universal Label identified in Annex F.2 was provided by SMPTE as a Leaf in the metadata dictionary for 'Audio edit decision list (ADL) defined in AES31-3'.  Also defined is a Node in the metadata dictionary for 'File exchange metadata defined in AES standards'. This means that further file-exchange labels can be generated more easily in the future.

 

Download a copy here


Posted: Tuesday, December 22, 2020

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AES-12id-2020 has been published, revised version of AES-12id-2006

The question of sample-clock quality is a perennial one for digital audio equipment designers, yet most chip makers provide very little information about the jitter performance of their products. Consequently, equipment designers are sometimes caught out by jitter issues. The increasing use of packet-based communications and class-D amplification is throwing these matters into sharper relief. This information document reviews various ways of characterizing and quantifying jitter, and refines several of them for audio purposes. It also attempts to present a common, unambiguous terminology. Its focus includes wideband jitter, baseband jitter, jitter spectra, period jitter, long-term jitter and jitter signatures. Comments are made on jitter transfer through phase-locked loops and on the jitter susceptibility of audio converters.

This revision removes culturally insensitive terms from the text and corrects minor editorial issues.  It is available now in the Standards Store.

Download a copy here


Posted: Wednesday, December 16, 2020

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AES17 revision to clarify definition of 0 dB FS

AES17 defines a digital Full Scale and 0 dB FS as the level of a sinewave whose peaks reach the largest positive digital code.  Some incorrectly display full scale sinewaves as -3 dB FS.  The AES17-2020 revision is an effort to eliminate this confusion.

Originally released in 1991, AES17 introduced and defined the measurement of 0 dB FS.  This definition has remained unchanged through revisions of the standard in 1996, 1998 and 2015.  The 2015 revision added notes to clarify the proper calibration of dB FS.  The 2020 revision further expands on these notes.

The 2020 revision will be available for download on 2020/12/11

More Information and to download a copy


Posted: Wednesday, December 9, 2020

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Call for Comment on DRAFT AES69-2020, " AES standard for file exchange — Spatial acoustic data file format "

The Call for Comment on DRAFT AES69-2020, " AES standard for file exchange – Spatial acoustic data file format " was published 2020-12-08.

Binaural listening is growing fast, because of growing sales in smartphones, tablets and other individual entertainment systems. The lack of a standard for the exchange of head-related transfer functions (HRTF) means each company keeps its binaural capture and rendering algorithms private. 3D audio is arising, and binaural listening could be the very first 3D audio vector with sufficient fidelity of HRTF.

The use of convolution-based reverberation processors in 3D virtual audio environments has grown with the increase in available computing power. Convolution-based reverberators guarantee an authentic and natural listening experience, but also depend on the acoustic quality of the applied spatial room impulse response (SRIR).

With a standardized file format for HRTF and SRIR data, each company can contribute its best algorithms, providing good personalized capture and/or rendering, allowing the consumer to choose a combination of technologies for the best quality of experience.

This document standardizes a file format to exchange space-related acoustic data, such as binaural listening parameters in the form of head related transfer functions. The format is scalable to match the available rendering process and is designed to include source materials from different databases.

More Information


Posted: Sunday, December 6, 2020

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AES74 Conformance Questionnaire has been published

The AES has launched a survey on AES74 Conformance.  This survey will assess the conformance of various media network directory schemes with AES74, the recently-published AES standard that sets forth technical requirements for media network directories and related services.

The survey is based on a downloadable questionnaire that may be filled out by proponents of directory schemes, by AES standards workers, or by a collaboration of the two. 

The completed questionnaires will be collated and summarized by AES standards workers.  Survey conclusions will be published in an AES Report.  AES Reports are non-normative documents that provide information.

The survey will not evaluate, review, or compare directory schemes or their implementations.  It will simply report on the AES74 conformance of each.

The results will be of interest to network media equipment manufacturers, to media system designers, and to media company technical architects and strategists.

Proponents of all media network directory schemes, whether public or proprietary, are encouraged to download and complete the survey instrument and forward the results to the AES according to the instructions given in the document. 

If you make, use, or know of a directory scheme that should be included, please email comments@standards.aes.org.

The AES Standards Committee has identified a list of well-known directory schemes it believes should be represented in the survey.  Members of AES Standards Task Group AES-SC-02-12-N will be explicitly contacting the owners of these schemes to ensure their representation in the final report.

The closing date for completed questionnaire submission is  February 28, 2021.

View / Download the questionnaire


Posted: Tuesday, November 3, 2020

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AESSC October 2020 meeting reports are online

Several reports of the October AES Standards Working Group meetings are now online.  

SC-02-01 on Digital Audio Measurement
SC-02-02 on Digital Audio Input/Output interfacing
SC-03-12 on Forensics
SC-04-04 on Microphone Measurement and Characterization
SC-04-08 on Measurement and Equalization of Sound Systems in Rooms
SC-05-02 on Audio Connectors


Additional reports will be posted as they become available.

View the reports here


Posted: Monday, November 2, 2020

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Fall 2020 AES Standards Meeting Schedule published

The New York AES Convention in October 2020 has been converted to a virtual format as a consequence of the COVID19 pandemic. Therefore the concurrent AES Standards meetings will be online as well. 

Since physical attendance is not required, the Standards meetings will not be held on the same dates as the technical sessions.  Standards meetings will be held before the technical sessions, to reduce schedule conflicts for attendees. 

Since attendees will no longer all be in the same time zone, as happens with physical meetings, the meeting schedule will be different. Meetings will occur over 5 days beginning October 5 with the Plenary session on Saturday October 10.  Meetings have been limited to 3 hours in any single day to allow meeting times which span the widest number of waking time zones.  

Since all active Task Groups hold regular online meetings, usually biweekly, they will not hold special meetings associated with the online convention.  

More Information


Posted: Monday, September 7, 2020

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Call for comments on an AES74 Conformance Questionnaire

The AES has just published a request for comments on an AES74 Conformance Questionnaire.

This questionnaire will be the instrument of an upcoming AES survey of network media directory schemes.  The survey will assess the conformance of each scheme with AES74, the recently-published standard requirements specification for media network directories and related services. 

The survey will not evaluate, review, or compare directory schemes or their implementations.  It will simply report on the AES74 conformance of each.

The survey will be done collaboratively with the proponents of the various schemes surveyed.

The survey's conclusions will be published in an AES report that will be of interest to network media equipment manufacturers, to media system designers, and to media company technical architects and strategists.

The survey aims to be inclusive:  If you make, use, or know of a directory scheme that should be included, please inform the AES via email to standards@aes.org. 

Comments are invited from anyone.  Comments received will be incorporated into the final copy of the questionnaire.  Instructions for submitting comments are in the download page.

The closing date for comment submission is  September 30, 2020. 

More Information and to download a copy


Posted: Tuesday, August 18, 2020

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AES Standards to remove culturally insensitive terms

The AES Standards Committee is starting a project to update terminology in AES Standards which may be culturally insensitive.  Use of the terms "master" and "slave" are specifically being examined, but others may be as well.  This is a general issue for all products, systems, architectures, and standards that have used those terms heretofore.

To avoid confusion it is also important that replacement terms be consistent with similar efforts being undertaken in the IEEE and SMPTE.  The AESSC has a strong liaison relationship with SMPTE and is looking to form one with the IEEE specifically to assist with this effort.

The committee hopes that in due course it can arrive at a uniform replacement that will work gracefully for the majority of cases, to avoid both opposing extremes:

1. having to develop case-specific solutions for each affected standard;

2. having generic but impossibly awkward terms.

The committee welcomes input on this topic.  Please address all comments and submissions to the Standards Manager.


Posted: Friday, July 31, 2020

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AESSC May 2020 meeting reports are online

Several reports of the May AES Standards Working Group meetings are now online.  

SC-02-01 on Digital Audio Measurement
SC-02-02 on Digital Audio input/output interfacing
SC-03-12 on Forensics
SC-04-04 on Microphone Measurement and Characterization
SC-04-08 on Measurement and Equalization of Sound Systems in Rooms
SC-04-09 on Assessment of Acoustic Annoyance

More Information


Posted: Wednesday, July 1, 2020

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