AES Standards News Blog

 

AES66-2012, Miniature XLR-type polarity and gender

AES66-2012, Miniature XLR-type polarity and gender

AES66-2012, AES standard for professional audio equipment - Application of connectors - Miniature XLR-type polarity and gender, has been published.

This standard is intended to apply to three- and five-pin circular connectors, commonly and generically known as miniature XLR-type, used for the balanced interconnection of all categories of sound system components for professional audio, commercial, recording, broadcast, and similar applications, regardless of function, type, or level of the signal. It specifies the application and polarity of analog signals for these connectors and is intended to avoid the inversion of absolute polarity among the items in the analog signal chain.

http://www.aes.org/publications/standards/search.cfm?docID=95


Posted: Tuesday, February 12, 2013

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AES65-2012, Connector for surround microphones

AES65-2012, Connector for surround microphones

 

AES65-2012, AES standard for interconnections - Connector for surround microphones, has been published.

An increasing number of surround sound microphones are becoming available, however, there has been no common standard for the connectors between microphone and recording device. It is expected that a standard connection will create a basis for smaller and lighter recording devices. 

This standard specifies a connector type and contact assignment for microphones having up to six balanced analog output channels, as used in surround sound applications. It includes specifications for marking and identification for the audio channels. It includes recommendations for cable type and detailed wiring. It is expected that other applications will also use this connection. 

http://www.aes.org/publications/standards/search.cfm?docID=94

 


Posted: Tuesday, February 12, 2013

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AES2-2012, Measuring the performance of loudspeakers - Drive units

AES2-2012, Measuring the performance of loudspeakers - Drive units

 AES2-2012, AES standard for acoustics - Methods of measuring and specifying the performance of loudspeakers for professional applications - Drive units, has been published.

This document is a recommended practice for describing and specifying loudspeaker components used in professional audio and sound-reinforcement systems. The document considers high-frequency and low-frequency drivers and passive loudspeaker systems for professional applications, and identifies the relevant methods of measurement. Specifications are given for describing frequency response, impedance, distortion, and power handling. This document does not consider sub-components such as spiders or cones. It is intended for loudspeaker system designers, and drive-unit manufacturers. 
 
This document is a substantial revision of AES2-1984, which it supersedes.
 
http://www.aes.org/publications/standards/search.cfm?docID=12


Posted: Tuesday, February 12, 2013

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AES-1id-2012, Plane-wave tubes - Design and practice

AES-1id-2012, Plane-wave tubes - Design and practice

AES-1id-2012, AES Information Document for Acoustics - Plane-Wave Tubes - Design and Practice, has been published

The standard AES2 calls for the use of plane-wave tube measurement of high-frequency horn drivers. Because many variations and results are possible, depending on the details of construction of plane-wave tubes, this document discusses those variations for the purpose of encouraging further experimentation.

This 2012 edition is a revision of AES 1id-1991. Additional uses of a plane-wave tube are listed. Further tests were performed to compare a distant microphone location with a close location to test the hypothesis that non-plane-wave radiation would be more accurately measured. A termination method is described. A modern method of calibration is referenced and summarized.

http://www.aes.org/publications/standards/search.cfm?docID=1

 


Posted: Tuesday, February 12, 2013

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AES31-2-2012, Audio file format for interchange

 AES31-2-2012, 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, 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.

This revision of AES31-2-2006 incorporates the content of Amendment 1 (2008) that specifies an optional Extended Broadcast Wave Format (BWF-E) file format, 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. BWF-E is also designed to be mutually compatible with the EBU T3306 "RF64" extended format.

This revision additionally packages a set of machine-readable loudness metadata into the BWF file. This is compatible with EBU v2 broadcast wave files. 

http://www.aes.org/publications/standards/search.cfm?docID=60

 


Posted: Thursday, January 24, 2013

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AES55-2012, MPEG Surround in an AES3 bitstream

 AES55-2012, AES standard for digital audio engineering - Carriage of MPEG Surround in an AES3 bitstream, has been published.

 

MPEG-D is an ISO/IEC standard describing MPEG Surround that extends 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 multi-channel audio signal. In this way backward compatibility to mono and stereo systems is achieved.

More recently, MPEG-D has been revised to include MPEG SAOC (Spatial Audio Object Coding) that uses the same method to convey the related side information over PCM.

This standard specifies how MPEG Surround or MPEG SAOC shall be carried within an AES3 bitstream where the downmix channels remain in the linear PCM domain and the MPEG Surround or MPEG SAOC data is embedded into the least-significant bits of the PCM audio data. 

http://www.aes.org/publications/standards/search.cfm?docID=53

 


Posted: Thursday, January 24, 2013

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AES64-2012, Command, control, and connection management for integrated media

 AES64-2012, AES standard for audio applications of networks - Command, control, and connection management for integrated media, has been published.

This standard for networked command, control, and connection management for integrated media is an IP-based peer-to-peer network protocol, in which any device on the network may initiate or accept control, monitoring, and connection management commands. The AES64 protocol has been developed around three important concepts: structuring, joining, and indexing. Every parameter is part of a structure, and control is possible at any of the levels of the structure, allowing for control over sets of parameters. Parameters can be joined into groups, thereby enabling control over many disparate parameters from a single control source. Every parameter has an index associated with it and, once discovered, this index provides a low bandwidth alternative to parameter control. 

http://www.aes.org/publications/standards/search.cfm?docID=93


Posted: Monday, January 14, 2013

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Call for Comment on DRAFT REVISED AES2, Measuring loudspeakers - Drive units

  A Call for Comment on DRAFT REVISED AES2-xxxx, AES standard for acoustics - Methods of measuring and specifying the performance of loudspeakers for professional applications - Drive units, was published 2012-12-22

http://www.aes.org/standards/comments/cfc-draft-rev-aes2-xxxx-121222.cfm


Posted: Saturday, December 22, 2012

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Call for Comment on DRAFT REVISED AES-1id, Plane-wave tubes

A Call for Comment on DRAFT REVISED AES-1id-xxxx,  AES Information Document for Acoustics - Plane-Wave Tubes - Design and Practice, was published 2012-12-22.

http://www.aes.org/standards/comments/cfc-draft-rev-aes-1id-xxxx-121222.cfm


Posted: Saturday, December 22, 2012

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Call for Comment on DRAFT AES65, Connector for surround microphones

  A Call for Comment on DRAFT AES65-xxxx, AES standard for interconnections - Connector for surround microphones, was published 2012-12-18.

http://www.aes.org/standards/comments/cfc-draft-aes65-xxxx-121218.cfm


Posted: Tuesday, December 18, 2012

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