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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 ausio 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 on August 26, 2019 at 5:00:00 AM EDT



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 on August 19, 2019 at 5:00:00 AM EDT



AES72-2019: AES standard on interconnections - Application of RJ45-type connectors and quad twisted pair cable for audio interconnections has been ublished

This standard documents 8P8C (RJ45) pin-outs commonly used in analog and digital professional audio
applications to carry four links, including channel/link order, signal polarity and phantom power
compatibility. Type numbers are assigned to these variations, allowing manufacturers to easily specify
which wiring standard is used in a particular piece of equipment. Users may use these type numbers to
assess compatibility of disparate equipment in a given application. This standard also documents practical
application details of interest to users of this technology. Conformance with this standard will identify
mutually compatible devices, enabling users to avoid problems when employing equipment from multiple
manufacturers.
 
The standard is available for sale now on in the AES Standards Store.

Purchase and Download

Posted on July 8, 2019 at 5:00:00 AM EDT



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.

Purchase and Download

Posted on July 8, 2019 at 5:00:00 AM EDT



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.

Purchase and Download

Posted on July 8, 2019 at 5:00:00 AM EDT



Call for Comment on Reaffirmation of AES56

Call for comment on reaffirmation of the following AES standard has been published on 2019-07-07:

AES56-2008: AES standard for 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.

More Information

Posted on July 7, 2019 at 5:00:00 AM EDT



Updated and reaffirmed versions of AES3-1, AES3-2, AES3-3, AES3-4, AES10, AES11, and AES68 have been published

Reaffirmed versions of the following AES standards have been published:

 
AES3-1-2009: AES standard for digital audio  -  Digital input-output interfacing - Serial transmission format for two-channel linearly-represented digital audio data - Part 1: Audio Content
 
AES3-2-2009: AES standard for digital audio  -  Digital input-output interfacing - Serial transmission format for two-channel linearly-represented digital audio data - Part 2: Metadata and Subcode
 
AES3-3-2009: AES standard for digital audio  -  Digital input-output interfacing - Serial transmission format for two-channel linearly-represented digital audio data - Part 3: Transport
 
AES3-4-2009: AES standard for digital audio  -  Digital input-output interfacing - Serial transmission format for two-channel linearly-represented digital audio data - Part 4: Physical and electrical
 
AES10-2008: AES Recommended Practice for Digital Audio Engineering - Serial Multichannel Audio Digital
Interface (MADI)
 
AES11-2009: AES recommended practice for digital audio engineering - Synchronization of digital audio
equipment in studio operations
 
AES68-2008: AES standard for audio connectors - XL Connectors to Improve Electromagnetic Compatibility
 
All seven standards have been updated to conform to the current IEC format. 
 
These standards are available for sale now on in the AES Standards Store.

Copies may be obtained here

Posted on July 7, 2019 at 5:00:00 AM EDT



AES71 at the AICP Post Production Boot Camp

Left to right: Harold Geller - Ad-id, Ryan Schnizlein - Cutters Studios, Joyce Chen - Facebook, Jim Starzynski - AES SC-02-12-P Chairman, Richard Klosa - Yangaroo

AES member and chair of AES Standards working group SC-02-12-P, Jim Starzynski participated on a panel on audio specifications at the Association of Independent Commercial Producers in NYC.  The panel discussed the issues and complications with delivering audio for various platforms and what can be done to bridge the differences with a common deliverable.  The goal is for AICP post-production members to deliver a single mix for all platforms.  Moderated by Harrold Geller of Ad-Id, the panel also included an independent mix engineer, a rep from content integration at Facebook and a commercial aggregator.

This was the first opportunity to present the new AES71 standard to a forum outside the AES.  Jim used the opportunity to review the standard and to talk about LKFS and the value of a universal deliverable.  Although the group had no awareness about AES71 and all the good work going on in AES and CTA, there was much support for striving towards a -24 LKFS loudness.  

This panel was a good first step in testing the waters and getting the word out!

Posted on June 11, 2019 at 5:00:00 AM EDT



Updated and reaffirmed versions of AES31-3, AES54-1, AES54-2, and AES54-3 have been published

Reaffirmed versions of the following AES standards have been published:

 
AES31-3-2008: AES standard for network and file transfer of audio  -  Audio-file transfer and exchange - Part 3: Simple project interchange
 
AES54-1-2008: AES standard on interconnections - Grounding and EMC practices - Connection of cable shields within connectors attached to portable balanced audio cables
 
AES54-2-2008: AES standard on interconnections - Grounding and EMC practices - Shields of balanced audio wiring within fixed and portable passive connector panels, jack fields, and passive microphone splitters
 
AES54-3-2008: AES standard on interconnections - Grounding and EMC practices - Shields of balanced microphone-level outputs of active equipment other than microphones
 
All four standards have been updated to conform to the current IEC format. AES31-3-2008 (r2019) includes several editorial corrections.

Download the new versions here

Posted on May 22, 2019 at 5:00:00 AM EDT


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