AES Standards News Blog

 Jeff Berryman, chair of AES Standards Task Group SC-02-12-L will present "The AES70 Object Model and How to Use It".  The webinar will be on May 31st from 12:00 to 1:00PM Eastern US time.  Jeff has deep knowledge of AES70, having chaired the group responsible for its development since its inception.  

Some reports of the Fall AES Standards Working Group meetings are now online.

SC-02-01 on Digital Audio Measurements
SC-02-12 on Audio Applications of Networks
SC-03-12 on Forensic Audio
SC-05-05 on Grounding and EMC Practices

Additional reports will be posted as they become available.

View the reports here

The spring meetings of the AES Standards Working Groups have been scheduled for May, prior to the AES Spring convention.  The standards meetings will all be virtual.  The working group meetings have been scheduled for 2 - 6 May. The plenary session where individual working groups report their progress in summary form will be on 16 May.

All standards meetings will be held using Zoom and are open to all interested parties.  Membership in AESSC working groups is open to all individuals.  AES membership is not required.

More Information

AES76-2022, "AES standard for audio forensics - Speech Collection Guidelines for Speaker Recognition: Interviewing at a Temporary Location" has been published on 2022-03-19.

This document specifies recommended practices for recording audio intended for use in forensic speaker recognition analyses, focusing on doing so at a temporary, non-laboratory location by possibly a non-professional in the forensic sciences.  It includes recommendations for the physical preparation of the location, selection of appropriate recording hardware and audio formats, and possible methods for interviewers to elicit the desired type and amount of speech from subjects.  It does not cover the methods used to analyze the resulting recordings and does not deal with details related to the handling, transmission, storage, or preservation of the collected data but does include a checklist to aid in the process.

This work was done in the SC-03-12 working group under the leadership of Marisa Dery.

For a preview and to purchase this document:

AES75-2022, "AES  standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise" has been published on 2022-03-04.

This standard details a procedure for measuring maximum linear sound levels of a loudspeaker system or driver using a test signal called M-Noise. In order to measure maximum linear sound levels meaningfully and repeatably, a signal is required whose RMS and peak levels as functions of frequency have been shown to be representative of program material. Various existing standards define noise-based test signals which, like M-Noise, have incorporated the knowledge that typical program material has a diminishing RMS level with increasing frequency, but M-Noise uniquely also features a relatively constant peak level as a function of frequency, so that the crest factor (peak level – RMS level) increases with frequency, which an analysis on a large variety of music and other content has revealed is an important additional characteristic of typical program material. The specified procedure determines a loudspeaker’s maximum linear sound levels by incrementally increasing the Playback Level of M-Noise until a stop condition is met: either an unacceptable change in the transfer function’s magnitude or an unacceptable change in the coherence of the transfer function.

For a preview and to purchase this document:

The Call for Comment on DRAFT AES76-xxxx, "AES standard for audio forensics - Speech Collection Guidelines for Speaker Recognition: Interviewing at a Temporary Location" was published 2022-02-03.

This document specifies recommended practices for recording audio intended for use in forensic speaker recognition analyses, focusing on doing so at a temporary, non-laboratory location by possibly a nonprofessional in the forensic sciences. It includes recommendations for the physical preparation of the location, selection of appropriate recording hardware and audio formats, and possible methods for interviewers to elicit the desired type and amount of speech from subjects. It does not cover the methods used to analyze the resulting recordings and does not deal with details related to the handling, transmission, storage, or preservation of the collected data but will include a checklist to aid in the process.

More Information and to download a copy

The slides from Marisa Dérys recent webinar on the work of the AES Standards Working Group on Forensic Audio, SC-03-12, are available for download.  These are copyrighted and are for individual educational use only. Reproduction or any other use requires written permission of the AES Standards Manager.

Download a copy here

Three profiles for Precision Time Protocol (PTP) might potentially be used in the professional media environment: the Peer-to-Peer Default PTP Profile of IEEE Std 1588-2008, the Media Profile of AES67 and the SMPTE Profile of SMPTE ST 2059-2.  This report compares the profiles and identifies features and parameter ranges that should enable interoperability among equipment conforming to the different profiles.

More Information and to download a copy

The Call for Comment on DRAFT AES75-xxxx, "AES standard for acoustics – Measuring loudspeaker maximum linear sound levels using noise" was published 2022-01-10

This standard details a procedure for measuring maximum linear sound levels of a loudspeaker system or driver using a test signal called M Noise. In order to measure maximum linear sound levels meaningfully and repeatably, a signal is required whose RMS and peak levels as functions of frequency have been shown to be representative of program material. Various existing standards define noise based test signals which, like M Noise, have incorporated the knowledge that typical program material has a diminishing RMS level with increasing frequency, but M Noise uniquely also features a relatively constant peak level as a function of frequency, so that the crest factor (peak level – RMS level) increases with frequency, which an analysis on a large variety of music and other content has revealed is an important additional characteristic of typical program material. The specified procedure determines a loudspeaker’s maximum linear sound levels by incrementally increasing the Playback Level of M Noise until a stop condition is met: either an unacceptable change in the transfer function’s magnitude or an unacceptable change in the coherence of the transfer function.

More Information and to download a copy

The slides from Jeff Berrymans recent webinar on AES70 are available for download.  These are copyrighted and are for individual educational use only. Reproduction or any other use requires written permission of the AES Standards Manager.

Download a copy here