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AES48-2019 Shields of connectors in audio equipment containing active circuitry, has been published

AES48-2019 AES standard on interconnections — Grounding and EMC practices — Shields of connectors in audio equipment containing active circuitry, has been published.

AES48 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. 

This standard specifies requirements for the connections of the designated shield contact of connectors built into audio equipment using active circuitry. These requirements are necessary for the preservation of electromagnetic compatibility (EMC) at both audio and radio frequencies.

To obtain copies of this standard, go to http://www.aes.org/publications/standards/ and search using "AES48", or go directly to:

http://www.aes.org/publications/standards/search.cfm?docID=44

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Posted on March 6, 2019 at 5:00:00 AM EST



Call for Comment on DRAFT AES73id-xxxx - AES information document for acoustics — Loudspeaker driver comparison chambers

The Call for Comment on DRAFT AES73id-xxxx, "AES information document for acoustics – Loudspeaker driver comparison chambers" was published 2019-03-05.

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-ofline 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.  It considers factors affecting the interchangeability of measurement data from simple loudspeaker comparison chambers and discusses some performance capabilities.

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Posted on March 5, 2019 at 5:00:00 AM EST



Call for Comment on DRAFT REVISED AES31-2-xxxx, AES standard on network and file transfer of audio - File format for transferring digital audio data between systems of different type and manufacture

The Call for Comment on DRAFT REVISED AES31-2-xxxx, "AES standard on network and file transfer of audio - File format for transferring digital audio data between systems of different type and manufacture" was published 2019-02-23.  

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.

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Posted on February 23, 2019 at 5:00:00 AM EST



Call for Comment on DRAFT AES72-xxxx - AES standard on interconnections - Application of RJ45-type connectors and quad twisted pair cable for audio interconnections

The Call for Comment on DRAFT AES72-xxxx, "AES standard on interconnections - Application of RJ45-type connectors and quad twisted pair cable for audio interconnections" was published 2019-02-15.

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.

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Posted on February 15, 2019 at 5:00:00 AM EST



Calls for Comment on Reaffirmation of AES31-3, AES54-1, AES54-2, AES54-3

Calls for comment on reaffirmation of the following AES standards have been published on 2019-02-07:

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

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Posted on February 7, 2019 at 5:00:00 AM EST



AES70, Audio applications of networks - Open Control Architecture, has been revised

AES70-2018 AES standard for audio applications of networks - Open Control Architecture, has been published in three parts.

AES70 defines a scalable control-protocol architecture for professional media networks. AES70 addresses device control and monitoring only; it does not define standards for streaming media transport. However, the Open Control Architecture (OCA) is intended to cooperate with various media transport architectures. 

Part 1: Framework describes the models and mechanisms of the AES70 Open Control Architecture. These models and mechanisms together form the AES70 Framework. This document should be read together with Part 2, Class Structure and Part 3, TCP/IP communications protocol.

Part 2: Class structure specifies the control class structure for AES70 that defines the AES70's control and monitoring functional capabilities and should be read in conjunction with Part 1, Framework, and Part 3, TCP/IP communications protocol. 

Part 3: Protocol for TCP/IP Networks specifies a protocol implementation for TCP/IP networks. It should be read in conjunction with Part 1, Framework, and Part 2, Class Tree. 

To obtain copies of this standard, go to http://www.aes.org/publications/standards/ and search using "AES70", or go directly to:

http://www.aes.org/publications/standards/search.cfm?docID=101

http://www.aes.org/publications/standards/search.cfm?docID=102

http://www.aes.org/publications/standards/search.cfm?docID=103

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Posted on January 21, 2019 at 5:00:00 AM EST



Call for Comment on REVISION of AES48-2005, Grounding and EMC practices - Shields of connectors in audio equipment containing active circuitry

The Call for Comment on REVISION of 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 connections of the designated shield contact of connectors built into audio equipment using active circuitry. These requirements are necessary for the preservation of electromagnetic compatibility (EMC) at both audio and radio frequencies.

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Posted on January 21, 2019 at 5:00:00 AM EST



AES Standards Chair Bruce Olson honored with AES Fellowship

Bruce Olson and AES President David Scheirman

 Bruce Olson, chair of the AES Standards Committee was awarded an AES Fellowship at last months NY AES Convention.  Bruce has served as AES Standards Chair since 2011, previously having served as Vice Chair, Western Hemisphere for the Standards Committee and serving as Chair of the SC-05-05 Working Group on Grounding and EMC.  As part of his long service to the AES, he has also been a member of the AES Board of Governors and Chair of his local AES chapter.  Bruce further known to many members of the AES through his consulting company Olson Sound Design and his long association with Ahnert Feistel Media Group.  

Posted on December 1, 2018 at 5:00:00 AM EST


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