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AES Standards Committee News
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[page updated 2008-05-09]
- AES31-3-2008, Simple project interchange
AES31-3-2008, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 3: Simple project interchange, has been published 2008-05-08.
This standard provides a convention for expressing audio edit data in text form in a manner that enables simple and accurate computer parsing while retaining human readability. Edit precision is sample-accurate while a presentation method (TCF) retains the readability of conventional frame-based time codes.
This revision incorporates previous corrigenda, and includes a number of editorial updates and corrections based on experiences of practical implementation. It has also been extended to include support for higher sampling frequencies and simple gain and surround pan automation.
- AES3-am5-2008, Amendment 5 to AES3-2003
AES3-am5-2008, Amendment 5 to AES standard for digital audio - Digital input-output interfacing - Serial transmission format for two channel linearly represented digital audio data, has been published 2008-04-19.
Recent projects to support carriage of MPEG Surround data in an AES3 bitstream (see AES55-2007), as well as questions arising when considering non-PCM data in an AES3 signal, require some detailed changes to the AES3 specification. This amendment adds a flag to indicate hidden data within a PCM signal, provides indications for two additional sampling frequencies, and clarifies the use of certain status bits when the signal is non-PCM.
- AES55-2007, Carriage of MPEG Surround in an AES3 bitstream
AES55-2007, AES standard for digital audio engineering - Carriage of MPEG Surround in an AES3 bitstream, has been published 2008-03-18.
MPEG Surround is an ISO/IEC standard to extend mono or stereo audio towards multiple channels. The mono or stereo audio channels represent a downmix of the original multi-channel audio that is generated by the MPEG Surround encoder. In addition the MPEG Surround encoder generates spatial side information (MPEG Surround data). An MPEG Surround decoder is able to combine this information with the downmix to result in a multichannel audio signal. In this way backward compatibility to mono and stereo systems is achieved.
This standard specifies how MPEG Surround shall be carried within an AES3 bitstream where the downmix channels remain in the linear PCM domain and the MPEG Surround data is encoded into the least-significant bits of the PCM audio data.
- AES-R9-2008 Considerations for standardising AES metadata sets
AES-R9-2008, AES standards project report - Considerations for standardising AES metadata sets, has been published 2008-03-12.
This report discusses primary issues and outlines some elementary considerations relevant to the standardisation of sets of audio metadata.
- Call for comment on DRAFT REVISED AES31-3-xxxx, Simple project interchange
A Call for Comment on DRAFT REVISED AES31-3-xxxx, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 3: Simple project interchange, was published 2008-02-07.
- Call for comment on DRAFT AES3-am5-xxxx, Amendment 5 to AES3
A Call for Comment on DRAFT AES3-Am5-xxxx, Amendment 5 to AES standard for digital audio - Digital input-output interfacing - Serial transmission format for two channel linearly represented digital audio data, published 2008-01-18, has closed without comment.
- Call for comment on DRAFT AES55-xxxx, Carriage of MPEG Surround in an AES3 bitstream
A Call for Comment on DRAFT AES55-xxxx, AES standard for digital audio engineering - Carriage of MPEG Surround in an AES3 bitstream, published 2007-12-17, has closed without unresolved comment.
- AES-R8-2007 Synchronisation of digital audio over wide areas
AES-R8-2007, AES standards project report - Synchronisation of digital audio over wide areas, has been published 2007-12-06.
This document is intended to provide guidance on synchronisation
issues to implementers of systems in which an audio signal originated
in digital form in one location is transmitted over a digital network
to another location.
- Call for comment on reaffirmation of AES46-2002, Radio traffic audio delivery extension to the broadcast-WAVE-file format
The Call for Comment on reaffirmation of AES46-2002 AES standard for network and file transfer of audio Audio-file transfer and exchange Radio traffic audio delivery extension to the broadcast-WAVE-file format, published 2007-07-04, closed without unresolved comment. AES46-2002 (r2007) is reaffirmed.
- Call for comment on reaffirmation of AES20-1996 (r2002), Subjective evaluation of loudspeakers
The Call for Comment on reaffirmation of AES20-1996 (r2002), AES recommended practice for professional audio - Subjective evaluation of loudspeakers, published 2007-11-15, has closed without comment. AES20-1996 (r2007) is reaffirmed.
- Call for comment on reaffirmation of AES27-1996 (r2002), Managing recorded audio materials intended for examination
The Call for Comment on reaffirmation of AES27-1996 (r2002), AES recommended practice for forensic purposes - Managing recorded audio materials intended for examination, published 2007-10-31, has closed without comment. AES27-1996 (r2007) is reaffirmed.
- AES-R4 Guidelines for AES47 - Transmission of digital audio over (ATM) networks NEW REVISION
AES-R4-2007, AES standards project report Guidelines for AES Recommended practice for digital audio engineering -- Transmission of digital audio over asynchronous transfer mode (ATM) networks, a revision of AES-R4-2002, has been published 2007-07-04.
The report was revised to correspond to the 2006 edition of AES47 and to take account of other events such as the publication of AES51, AES52, and AES53.
- Call for comment on reaffirmation of AES46-2002, Radio traffic audio delivery extension to the broadcast-WAVE-file format
The Call for Comment on reaffirmation of AES46-2002 AES standard for network and file transfer of audio Audio-file transfer and exchange Radio traffic audio delivery extension to the broadcast-WAVE-file format, published 2007-07-04, closed without unresolved comment. AES46-2002 (r2007) is reaffirmed.
- AES-2id-2006, Guidelines for the use of the AES3 interface has been published
This document provides guidelines for the use of AES3, "Serial transmission format for two-channel linearly represented digital audio data", together with AES5, "Preferred sampling frequencies", and AES11, "Synchronization of digital audio equipment in studio operations".
This extensive and substantial 2006 revision integrates all that information relating to standards AES3, AES5, AES11 and information document AES-3id that is important to the implementation of AES3 but which is itself not part of the standard in any normative sense.
These guidelines are intended to assist a user to understand and use the AES3 digital audio interface. The examples provided are not intended to be restrictive, but to clarify. The AESSC hopes these guidelines will further the design of mutually compatible interfaces and encourage consistent operational practices. This revision includes details on the implementation of the coaxial interface described in AES-3id-2001.
This text has been restructuring to split physical, transport and essence into separate parts which may be more conveniently revised in the future.
[2007-04-06]
- AES-12id-2006, Jitter performance specifications has been published
A new Information Document, AES-12id-2006, AES Information Document for digital audio measurements - Jitter performance specifications, has been published.
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.
[2007-03-19]
- AES-6id-2006, Personal computer audio quality measurements has been published
A substantially updated Information Document, AES-6id-2006, AES information document for digital audio - Personal computer audio quality measurements, has been published.
This document focuses on the measurement of audio quality specifications in a PC environment. Each specification listed has a definition and an example measurement technique. Also included is a detailed description of example test setups to measure each specification.
There have been many improvements in PC audio since the original AES-6id document was published. This revision of AES-6id-2000 includes substantial updates that reflect the improvements in the PC sound sub-system, as well as some updates based on many real world measurements.
[2007-02-21]
- AES-11id-2006, Extended term storage environment for multiple media archives has been published
A new Information Document, AES-11id-2006, Extended term storage environment for multiple media archives has been published
This information document provides guidelines for archivists faced with storing a variety of audio, still image and moving image media in a single storage environment. This circumstance is faced by many archivists in small and medium size archives that must preserve and make available the wide variety of media from nitrate film to optical discs. These guidelines provide recommendations to harmonize storage recommendations contained in standards and recommended practices published by the AES and the International Standards Organization (ISO).
[2007-02-19]
- Call for comment on reaffirmation of AES-4id-2001, Surface scattering uniformity
The Call for comment on reaffirmation of AES-4id-2001, AES information document for room acoustics and sound reinforcement systems - Characterization and measurement of surface scattering uniformity
published 2007-02-13, closed without unresolved comment. AES-4id-2001 (r2007) is reaffirmed.
- Call for comment on DRAFT REVISED AES-2id-xxxx, Guidelines for the AES3 interface
A Call for Comment on DRAFT REVISED AES-2id-xxxx, AES information document for digital audio engineering - Guidelines for the use of the AES3 interface, published 2006-12-28, closed without unresolved comment. AES-2id-2006 has been published (see above).
- Call for comment on DRAFT AES-12id-xxxx, Jitter performance specifications
A Call for Comment on DRAFT AES-12id-xxxx, AES Information Document for digital audio measurements - Jitter performance specifications, published 2006-12-07, has closed without comment.
- Call for comment on DRAFT REVISED AES-6id-xxxx, Personal computer audio quality measurements
A Call for Comment on DRAFT REVISED AES-6id-xxxx, AES information document for digital audio - Personal computer audio quality measurements, published 2006-11-10, closed without unresolved comment.
- Call for comment on DRAFT AES-11id-xxxx, Extended term storage environment for multiple media archives
A Call for Comment on DRAFT AES-11id-xxxx, AES Information document for Preservation of audio recordings - Extended term storage environment for multiple media archives published 2006-11-01, closed without comment.
- AES53-2006, Sample-accurate timing in AES47
has been published
A new standard, AES53-2006, AES standard for digital audio - Digital input-output interfacing - Sample-accurate timing in AES47
has been published.
This document specifies how the timing markers specified in AES47 may be used to associate an absolute timestamp with individual audio samples. AES47 specifies a format for the transmission of digital audio over asynchronous transfer mode (ATM) networks. A recommendation is made to refer these timestamps to the SMPTE epoch which in turn provides a reference to UTC and GPS time. [2006-10-31]
- Call for comment on reaffirmation of AES45-2001 Connectors for loudspeaker patch panels
The Call for Comment on reaffirmation of AES45-2001, AES standard for single programme connectors - Connectors for loudspeaker patch panels,
published 2006-10-20, closed without unresolved comment. AES45-2001 is reaffirmed
- Call for comment on reaffirmation of AES26-2001, Conservation of the polarity of audio signals
The Call for Comment on reaffirmation of AES26-2001 AES recommended practice for professional audio interconnections - Conservation of the polarity of audio signals
published 2006-10-20, closed without unresolved comment. AES26-2001 is reaffirmed
- AES-R7-2006, Report: Considerations for accurate peak metering of digital audio signals
has been published
A new report, AES-R7-2006, AES standards project report - Considerations for accurate peak metering of digital audio signals
has been published.
Peak meters in digital audio systems often register "peak sample" values rather than "true peak" levels. Such meters are simple to implement, but they do not always register the true peak value of the audio signal.
In order to meter the maximum amplitude, or true-peak value, of a sampled signal it is necessary to "over sample" (or "up sample") the signal, essentially using interpolation to increase the sampling frequency of the signal and thus recreating the original signal between the existing samples.
This report discusses criteria for the design of a true-peak meter and proposes appropriate over-sampling ratios to achieve true-peak metering accuracy. [2006-09-04]
- AES31-2-2006, AES standard for digital audio data files
has been published
A new standard, AES-31-2-2006, AES standard on network and file transfer of audio - Audio-file transfer and exchange - Part 2: File format for transferring digital audio data between systems of different type and manufacture
.
This standard defines a file format for interchanging audio data between compliant equipment. It is primarily intended for audio applications in professional recording, production, post production, and archiving.
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.
[2006-07-15]
- Call for comment on DRAFT AES53-xxxx, standard for Sample-accurate timing in AES47
A Call for Comment on DRAFT AES53-xxxx, AES standard for digital audio - Digital input-output interfacing - Sample-accurate timing in AES47, published 2006-07-14, has been completed without comment.
- Call for comment on reaffirmation of AES-3id-2001, AES information document for digital audio engineering - Transmission of AES3 formatted data by unbalanced coaxial cable
A Call for Comment on reaffirmation of AES-3id-2001 AES information document for digital audio engineering - Transmission of AES3 formatted data by unbalanced coaxial cable , published 2006-07-08, closed without unresolved comment. The information document was reaffirmed 2006-10-18
- Call for comment on reaffirmation of AES31-1-2001, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 1: Disk format
The Call for Comment on reaffirmation of AES31-1-2001 AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 1: Disk format , published 2006-07-08, closed without unresolved comment. AES31-1-2001 is reaffirmed
- AES42-2006, AES standard for acoustics - Digital interface for microphones
has been published
A revised standard, AES42-2006, AES standard for acoustics - Digital interface for microphones
has been published.
This standard describes an extension of the existing digital audio interface AES3 to provide a digital interface for microphones and revises AES42-2001. The principal changes in this document define additional operating features in the command structure so that processing internal to the microphone may be controlled from a mixing console, for example.
- AES51-2006, AES standard for digital audio - Digital input-output interfacing - Transmission of ATM cells over Ethernet physical layer has been published
A new standard, AES51-2006, AES standard for digital audio - Digital input-output interfacing - Transmission of ATM cells over Ethernet physical layer has been published.
This standard specifies a method, also known as "ATM-E", of carrying asynchronous transfer mode (ATM) cells over hardware specified for IEEE 802.3 (Ethernet). It is intended as a companion standard to AES47 (Transmission of digital audio over ATM networks), to provide a standard method of carrying ATM cells and real-time clock over hardware specified for Ethernet.
- Call for comment on DRAFT AES31-2-xxxx, standard for interchange audio file format
Call for Comment on DRAFT AES31-2-xxxx, AES standard on network and file transfer of audio - Audio-file transfer and exchange - File format for transferring digital audio data between systems of different type and manufacture , published 2006-04-03, closed without unresolved comment.
- Call for comment on DRAFT AES51-xxxb, standard for Transmission of ATM cells over Ethernet physical layer
Call for Comment on DRAFT AES51-xxxx, AES standard for digital audio Digital input-output interfacing Transmission of ATM cells over Ethernet physical layer has been completed without comment.
[2006-03-10]
- The Call for Comment on DRAFT REVISED AES42-xxxx, AES standard for acoustics - Digital interface for microphones, has been published 2006-02-23.
The Call for Comment on DRAFT REVISED AES42-xxxx, AES standard for acoustics - Digital interface for microphones, published 2006-02-23, has been completed without comment.
[2006-02-23]
- AES52-2006, AES standard for digital audio engineering - Insertion of unique identifiers into the AES3 transport stream has been published
A new standard, AES52-2006, AES standard for digital audio engineering - Insertion of unique identifiers into the AES3 transport stream has been published.
The AES3 transport stream continues to be used extensively in both discrete and network based audio systems alongside audio stored as files. Audio content is moving towards being handled by asset management systems and descriptive metadata associated with that content is also being stored within systems. In order to provide a mechanism for AES3 transport streams to have similar abilities to work with content management systems, some form of unique label is required which can provide the link with these systems. One of the unique labels currently standardised in the media industry is the SMPTE UMID while another commonly used in the Information Technology area is the IEC UUID.
This standard specifies the method for inserting unique identifiers into the user data area of an AES3 stream. This specifically covers the use of UUID as well as a basic or extended SMPTE UMID.
-
AES47-2006 revised standard for transmission of digital audio over ATM networks
has been published
A revised standard, AES47-2006 Standard for digital audio - Digital input-output interfaces - Transmission of digital audio over asynchronous transfer mode (ATM) networks has been published
This document specifies the method of carrying multiple channels of audio in linear PCM or AES3 format in calls across an asynchronous transfer mode (ATM) network to ensure interoperability. The specification includes the method of conveying information concerning the format and sampling frequency of the digital audio signal when setting up the calls.
The 2006 revision specifies an Organizationally Unique Identifier, and simplifies the minimum requirements to ensure interworking.
The companion report, AES R4-2002, also available from this site, is a useful explanatory supplement.
- Call for Comment on DRAFT AES52-xxxx, AES standard for digital audio engineering - Insertion of unique identifiers into the AES3 transport stream
Call for Comment on DRAFT AES52-xxxx, AES standard for digital audio engineering - Insertion of unique identifiers into the AES3 transport stream has been completed without comment.
[2005-11-24]
- Call for comment on DRAFT REVISED AES47-xxxx, standard for Digital Audio in asynchronous transfer mode (ATM)
Call for Comment on DRAFT REVISED AES47-xxxx, AES standard for digital audio - Digital Audio in asynchronous transfer mode (ATM) has been published.
[2005-11-12]
This Call for comment was completed without comment.
- Call for comment on DRAFT AES51-xxxx, standard for Transmission of ATM cells over Ethernet physical layer
Call for Comment on DRAFT AES51-xxxx, AES standard for digital audio Digital input-output interfacing Transmission of ATM cells over Ethernet physical layer is closed.
Comments were received that required substantive changes to the text. A new draft, revised accordingly, will be offered for comment as soon as possible.
[2005-11-09]
- Call for comment on reaffirmation of AES35-2000, standard for life expectancy of magneto-optical discs
Call for Comment on reaffirmation of AES35-2000, AES standard for audio preservation and restoration - Method for estimating life expectancy of magneto-optical (M-O) discs, based on effects of temperature and relative humidity has been published.
[2005-09-02]
This Call for Comment was completed without comment. The standard was reaffirmed 2005-12-03.
- Call for comment on reaffirmation of AES38-2000, standard for life expectancy of recordable compact disc systems
Call for Comment on reaffirmation of AES38-2000, AES standard for audio preservation and restoration - Life expectancy of information stored in recordable compact disc systems - Method for estimating, based on effects of temperature and relative humidity has been published.
[2005-09-02]
This Call for Comment was completed without comment. The standard was reaffirmed 2005-12-05.
- AES49-2005 standard for magnetic tape care & handling has been published
A new standard, AES49-2005: AES standard for audio preservation and restoration - Magnetic tape - Care and handling practices for extended usage has been published.
This standard recommends handling procedures to maximize the effective life of magnetic tape. Faulty handling, packing and transporting techniques and methods often cause damage to magnetic tape and the content recorded thereon. Extending the longevity of magnetic tape requires the identification of appropriate handling methods and well-developed training programs.
While some of the recommendations apply specifically to large-scale or archival usage, the basics of all recommendations in this document can and should be applied in all circumstances where the desired result is long-term usage of the medium. This standard is not aimed at casual home users of tapes.
This standard addresses the following subjects:
- handling techniques, including methods to mitigate common hazards;
- handling environments, including pollutants, temperature and humidity, lighting, magnetic fields, and robotics;
- use of tape, including inspection, playback, winding speed, tension, and robotic systems;
- cleaning and maintenance techniques, including contaminants, cleaning methods and frequency;
- transportation, both in-house and shipping outside the storage facility;
- disasters, including water, fire, construction and post-disaster procedures;
- staff training, including schedule for training
[2005-08-09]
- Call for comment on reaffirmation of AES43-2000, standard for authentication of analog audio tape recordings
Call for Comment on reaffirmation of AES43-2000, AES standard for forensic audio - Criteria for the authentication of analog audio tape recordings has been published.
[2005-08-03]
This Call for Comment was completed without unresolved comment. The standard was reaffirmed 2005-11-05
- Call for comment on reaffirmation of AES41-2000, standard for Recoding data set for audio bit-rate reduction
Call for Comment on reaffirmation of AES41-2000, AES standard for digital audio - Recoding data set for audio bit-rate reduction has been published.
[2005-07-20]
This Call for Comment was completed without comment. The standard was reaffirmed 2005-10-21
- AES50-2005 standard for high-resolution multi-channel audio interconnection (HRMAI) has been published together with AES-R6-2005 implementation guidelines report
A new standard, AES50-2005: AES standard for digital audio engineering - High-resolution multi-channel audio interconnection (HRMAI) has been published.
HRMAI provides a professional multi-channel audio interconnection with a number of distinctive characteristics:
- Support for a wide range of commonly-used digital audio coding formats, including high sample-rate linear PCM and one-bit delta-sigma modulated formats
- Low and deterministic latency
- Use of ubiquitous "Category-5" data cable
- Interconnect span up to 100 m
- High-quality full-duplex clocks transmitted in parallel with audio data
- Full-duplex audio interconnection
- 5 Mbit/sec full-duplex auxiliary data connection, compatible with Ethernet networks.
HRMAI is a high-performance point-to-point audio interconnection rather than a network, although the auxiliary data may operate as a true network independently of the audio.
A new report, AES-R6-2005 AES project report - Guidelines for AES standard for digital audio engineering - High-resolution multi-channel audio interconnection (HRMAI) is intended to accompany AES50-2005. It provides additional background, rationale and implementation advice. In particular, the first section of the report provides a useful overview of the technology.
[2005-07-18]
- AES48-2005 standard for shielding has been published
A new standard, AES48-2005: AES standard on interconnections - Grounding and EMC practices - Shields of connectors in audio equipment containing active circuitry has been published.
This standard specifies requirements for the termination, within audio equipment, of the shields of cables supporting interconnections with other equipment, taking into account measures commonly necessary for the preservation of EMC (electromagnetic compatibility) at both audio and radio frequencies.
The shielding (or screening) of audio equipment, cables, and microphones can be critical for electromagnetic compatibility (EMC). The improper connection of these shields can cause common-impedance coupling in equipment. From XL connector usage, where Pin 1 is standardised as the designated shield contact, this has been identified as the "Pin 1 problem"
[2005-03-09]
- Call for comment on DRAFT AES-50, HRMAI standard
Call for Comment on DRAFT AES50-xxxx, AES standard for digital audio engineering - High-resolution multi-channel audio interconnection (HRMAI) has been published. has been published.
[2005-03-08]
- AES-10id New revision of MADI engineering guidelines published
A new revision of AES-10id, AES Information Document on engineering guidelines for the Multi-channel Digital Audio Interface (MADI) has been published. The contents have been brought up to date and reorganised in the light of current experience.
The original MADI specification depended very much on the silicon parts available in 1991 - the so-called 'TAXI' chips - one for encoding and one for decoding. These are no longer available, but there is at least one combined chip available, and it is entirely possible to realize the encoding and decoding of sync symbols and traffic bytes in programmable logic devices. These are always supported by compilers, often from a high-level language, and in some cases, the FDDI functions are available as a library to input to the compiler, together with the designers own enhancements and customisations.
While attention should be paid to EMC design criteria, MADI is less prone to emissions than digital video, for example, due to lower transmission levels and
[2005-03-07]
- Call for comment on reaffirmation of AES7-2000, standard for magnetic flux levels
Call for Comment on reaffirmation of AES7-2000, AES standard for the preservation and restoration of audio recording - Method of measuring recorded fluxivity of magnetic sound records at medium wavelengths has been published.
[2005-02-16]
This Call for Comment was completed without comment. The standard was reaffirmed 2005-05-17.
- A New Initiative Toward Digital Audio Connectors
The SC-02-02 Working Group of the AES Standards Committee, charged with the development of AES3, is currently considering a new connector type to identify AES3 equipment, signals, and connections and is producing an extensive report on the subject and a questionnaire to gather input from the user community. http://www.aes.org/standards/
[2004-12-22]
- Call for comment on revised AES-10id, MADI guidelines
A Call for Comment on DRAFT REVISED AES-10id-r-xxxx, AES information document for digital audio engineering - Engineering guidelines for the multichannel audio digital interface AES10 (MADI) has been published.
This document deals with a number of details not laid down in the AES10 standard, or unnecessarily restricted by the standard, concerning synchronisation, packing, and so on which have given rise to delivery problems. The first edition of this document, AES-10id-1995, has many explanatory notes but was mostly written before there was very much experience of using MADI operationally.
[2004-11-22]
- Call for comment on draft AES48-xxxx on shielding
AES48-xxxx: AES DRAFT standard on interconnections - Grounding and EMC practices - Shields of connectors in audio equipment containing active circuitry has been published.
This standard specifies requirements for the termination, within audio equipment, of the shields of cables supporting interconnections with other equipment, taking into account measures commonly necessary for the preservation of EMC (electromagnetic compatibility) at both audio and radio frequencies.
[2004-10-26]
- New-style on-line standards publication
The publication of AES standards, previously handled by two separate outlets, has now been consolidated into a single new facility. Standards in Print now provides access to full documents for purchase and also print-restricted courtesy versions for free downloads. AES members may download full copies of AES Standards documents at no cost. A search facility basd on document titles and abstracts provides rapid access to the documents you need.
www.aes.org/publications/standards/
[2004-10-05]
- Call for comment on withdrawal of AES24-1-1999 and AES24-2-1999
Calls for Comment on withdrawal on two standards: AES24-1-1999 (Revision of AES24-1-1995): AES standard for sound system control - Application protocol for controlling and monitoring audio devices via digital data networks - Part 1: principles, formats, and basic procedures and AES24-2-1999: AES standard for sound system control - Application protocol for controlling and monitoring audio systems - Part 2: Class tree have been published.
[2004-05-25]
- XLR polarity standard is reaffirmed
AES14-1992, AES standard for professional audio equipment - Application of connectors, part 1, XLR-type polarity and gender has been reaffirmed for a further period of up to five years.
This small but significant document was able to resolve a long-standing confusion over the use of an XLR connector in balanced analogue audio circuits and confirmed that Pin 2 should be positive polarity, or 'hot', compared with Pin 3.
[2004-03-03]
- Measurement of digital audio equipment standard is reaffirmed
AES17-1998: AES standard method for digital audio equipment - Measurement of digital audio equipment has been reaffirmed for a further period of up to five years.
[2004-03-03]
- New AESSC Chair Appointed
We are delighted to announce that Richard Chalmers has been appointed as the new AES Standards Committee Chair by the AES President, Ron Streicher, February 2004.
"Richard Chalmers' activities within the European Broadcasting Union (EBU), based in Geneva, shows him to be someone who understands the purpose and value of audio standards as well as someone who brings an abundance of knowledge and experience to the work of the AESSC."
[2004-02-16]
- Publication of revised report on audio level notation
AES-R2, AES project report for articles on professional audio and for equipment specifications - Notations for expressing levels has been published, 2004-02-19, and is available via the Web site.
The revision has clarified the use of audio levels in "dBu", and abandons the earlier intention to recommend the adoption of 1 V as the reference quantity for audio levels in decibels.
- Publication of revised studio synchronisation standard
AES11-2003, AES recommended practice for digital audio engineering - Synchronization of digital audio equipment in studio operations is published, 2003-12-05, and is available via the Web site.
It is a revision of AES11-1997 and provides for an extended, hierarchical, set of sampling frequencies.
- Publication of revised sampling frequencies standard
AES5-2003: AES recommended practice for professional digital audio - Preferred sampling frequencies for applications employing pulse-code modulation has been published, 2003-10-04, and is available via the Web site.
It is a revision of AES5-1998 and includes preferred choices for higher sampling frequencies.
- Publication of revised digital interface standard
AES3-2003: AES Recommended practice for digital audio engineering - Serial transmission format for two channel linearly represented digital audio data has been published, 2003-09-09, and is available via the Web site.
It is a revision of AES3-1992 and consolidates the four amendments to the second edition into a single document and generally updates the layout. Minor normative changes have been made to define a User Bit management state for metadata and to update " Electrical requirements, General characteristics" to follow a more generalise model adopted by IEC 60958-4 in 2002.
- Loudspeaker angular resolution information document is reaffirmed
AES-5id-1997, AES information document for Room acoustics and sound reinforcement systems - Loudspeaker modeling and measurement - Frequency and angular resolution for measuring, presenting and predicting loudspeaker polar data has been reaffirmed 2003-06-29 for a further period of up to five years.
- Plane wave tubes information document is reaffirmed
AES-1id-1991, AES Information Document -- Plane wave tubes: design and practice has been reaffirmed 2003-06-29 for a further period of up to five years.
- Storage of polyester tape standard is reaffirmed
AES22-1997, AES recommended practice for audio preservation and restoration - Storage and handling - Storage of polyester-base magnetic tape has been reaffirmed 2003-06-29 for a further period of up to five years.
- Life expectancy of CD-ROM standard is reaffirmed
AES28-1997, AES standard for audio preservation and restoration -- Method for estimating life expectancy of compact discs (CD-ROM), based on effects of temperature and relative humidity has been reaffirmed 2003-06-29 for a further period of up to five years. This printing includes Amendment 1-2001.
- Loudspeaker cone resonance standard is withdrawn
AES19-1992 (withdrawn 2003) AES-ALMA standard test method for audio engineering -- Measurement of the lowest resonance frequency of loudspeaker cones has been withdrawn 2003-06-11.
Note: this standard, although withdrawn as an AES document, will continue to be maintained by ALMA International .
- Publication of revised MADI standard
AES10-2003: AES Recommended Practice for Digital Audio Engineering - Serial Multichannel Audio Digital Interface (MADI) has been published, 2003-06-03, and is available via the Web site.
This is a revision of AES10-1991 which recognises other uses to which the interface has been put, notably distributed routing and hence the increase in channels to the maximum of 64 at 48 kHz sampling; the introduction of 96 kHz sampling in digital audio origination; and the use of data transmission in the carrier system.
updates the layout and organisation of the document and adds
Daniel Queen, tireless secretary of the AES Standards Committee since 1980, passed away in October 2002. An appreciation of his life is posted here.
- Introduction of new AESSC Internet facilities, 2002-10-03
A completely new suite of Internet communications facilities to support AES Standards has been introduced, 2002-10-03. The suite includes:
- Moderised e-mail reflectors for all AESSC groups
- On-line address updates
- Automatic anti-spam and anti-virus defenses
- New public Web sites
- Secure document exchange sites for all groups
- Simpler password scheme for group members
- Publication of CART chunk standard
AES46-2002, AES standard for network and file transfer of audio - Audio-file transfer and exchange - Radio traffic audio delivery extension to the broadcast-wave-file format has been released for downloading or purchase 2002-06-10.
- Publication of AES3 in ATM standard
AES47-2002, AES standard for digital audio - Digital input-output interfacing -Transmission of digital audio over a asynchronous transfer mode (ATM) networks, has been released for downloading or purchase 2002-04-21. An accompanying guideline, AES-R4-2002 has also been released.
- AESSC management change
Mark Yonge replaced Dan Queen as Standards Manager and secretary of the AES Standards Committee, following the AES 111th Convention.
- Pro-audio definition
Definition of professional audio presented by AESSC to the 1999 Plenary meeting of International Electrotechnical Commission TC 100 in Beijing, China.
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(C) 2008, Audio Engineering Society, Inc.
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