AES Standards News Blog

Call for Comment on WITHDRAWAL 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 in accordance with our 5-year review policy on 2010-07-12.

The reason for withdrawal is that the Magneto-Optical discs discussed in this document are no longer in current use and it can be assumed that the content of such discs in former use have now been migrated to newer media. It is noted that, under current policy, the content of this document will remain available through the AES Standards Store as a withdrawn document; also a substantially identical document is available from the ISO as ISO 18926:2006, "Imaging materials - Information stored on magneto-optical (MO) discs - Method for estimating the life expectancy based on the effects of temperature and relative humidity".

http://www.aes.org/standards/comments/

Call for Comment on REAFFIRMATION of AES38-2000 (r2005), 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 in accordance with our 5-year review policy.

http://www.aes.org/standards/comments/

The Call for Comment on withdrawal of AES-3id-2001, "AES information document for digital audio engineering - Transmission of AES3 formatted data by unbalanced coaxial cable",  published 2010-04-06, closed without comment. 

This Information Document is therefore withdrawn. 

The reason for this withdrawal is that the content of AES-3id has been superseded by AES3-4-2009, Annex D (Normative) "Coaxial transmission", and by AES- 2id Annex C "Coaxial cable adapters and equalizer characterization", and so this Information Document has become redundant.

However, as a transitional measure, it will continue to be available in the AES Standards Store as AES-3id-2001 (w2010) for the time being.
 

The Call for Comment on reaffirmation of AES48-2005, "AES standard on interconnections - Grounding and EMC practices - Shields of connectors in audio equipment containing active circuitry",  published 2010-04-06, has closed without comment. 

This standard is therefore reaffirmed as AES48-2005 (r2010).

A revised edition of AES41-2009: AES standard for digital audio - Recoding data set for audio bit-rate reduction has ben published.

This document describes a format for the data to be transmitted to identify a number of popular audio bit-rate reduction techniques. Provision is also made for the transmission of additional ancillary information. This document also describes a mechanism whereby the data derived from the coded signal can be transported with the decoded signal so that the data may be recovered and used to aid a subsequent re-encoding process.

This 2009 revision extends AES41 to include data formats for carrying this loudness and down-mix metadata with the uncompressed PCM using the same transport mechanism as before. The metadata can therefore be carried in the audio to which it relates.

A new AES Standards project, AES-X193, "Sound source modeling - Array and cluster polar radiation measurements" has been initiated.

The standard aims to "specify how the angular measurements of polar radiation data for arrays or cluster arrangements of loudspeakers 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."

Multiple loudspeakers may be used from the same or different manufacturers to create an array or cluster of loudspeakers. There are additional requirements necessary for these measurements beyond those spelled out in the existing AES56 standard on polar radiation measurements. It is important that these requirements be standardized in order to enable the use of this data in room acoustic, electro-acoustic, and sound system predictions.

Development of this standard has been assigned to the AES standards working group SC-04-01 on Acoustics and Sound Source Modeling.  More information can be found at:

http://www.aes.org/standards/meetings/init-projects/aes-x193-init.cfm

A new AES Standards project, AES-X189, "Connector for surround microphones" has been initiated.

The project aims to "establish a standard for the connector type and contact assignment for microphones having four or more balanced analog output channels, as used in surround sound applications. It will include specifications for marking and identification for the audio channels. It will include recommendations for cable type and detailed wiring. "

Modern recording techniques for surround sound applications often uses an array of microphones with a predetermined physical relationship. Individual connections using conventional microphone cables become sufficiently bulky and heavy that the practical options for placing the microphones in any sound field is unnecessarily constrained, and important recording options are compromised. A standard connector that is able to handle a range of surround microphone types will allow greater placement speed and recording flexibility, and will allow manufacturers of microphones, recording equipment, and interconnect cables to design with confidence.

Development of this standard has been assigned to the AES standards working group SC-04-04 on Microphone Measurement and Characterization.  More information can be found at:

http://www.aes.org/standards/meetings/init-projects/aes-x189-init.cfm

A new AES standards project, AES-X170, "Integrated Control, Monitoring and Connection Management for Digital Audio Networks" has been initiated. The project aims to create and standardize:

1. A set of structured Internet Protocol-based messages that can be used to control single parameters or groups of parameters, and to monitor these parameters. The parameters are associated either with typical signal processing functionality within audio devices, synchronization between such devices, or connections between such devices.

2. A mechanism for grouping of device parameters, and messages required to implement such grouping.

3. A mechanism for the control of latency within networks of audio devices, and a specification of the messages and parameters required for the control of such latency.

4. Parameter modifiers, and the messages required to create and configure such modifiers.

5. Security levels, and the messages required to set and get such levels.

There is currently no universally adopted specification for transmitting control, monitoring, and connection management information across audio networks. This project aims to create such a specification, and in so doing enable comprehensive control, monitoring, and interconnection of networked audio devices. Because the messaging within this specification is based on the Internet Protocol, it will be useable within networks that use various physical layers.

Development of this standard has been assigned to the AES standards working group SC-02-12 on Audio Applications of Networks.  More information can be found at

http://www.aes.org/standards/meetings/init-projects/aes-x170-init.cfm

A Call for Comment on WITHDRAWAL of AES-3id-2001, AES information document for digital audio engineering - Transmission of AES3 formatted data by unbalanced coaxial cable has been published on 2010-04-06.

The reason for this withdrawal is that the content of AES-3id has been superseded by AES3-4-2009, Annex D (Normative) "Coaxial Transmission", and so this Information Document has become redundant.

A Call for Comment on REAFFIRMATION of AES48-2005, AES standard on interconnections - Grounding and EMC practices - Shields of connectors in audio equipment containing active circuitry has been published in accordance with our 5-year review policy, 2010-04-06.