AES Standards News Blog

AES31-1-2001, Audio-file disk format, has been reaffirmed

Mon, 17 Oct 2011 01:00:00 -0700

AES31-1-2001 (r2011), AES standard for network and file transfer of audio - Audio-file transfer and exchange - Part 1: Disk format has been reaffirmed.

This document defines a disk format specification to maintain compatibility with as wide a user base as possible to facilitate audio-file transfer and exchange between differing systems. The document does not describe a complete disk format but provides enough information for choosing a proprietary system that will maintain compatibility.

AES47-2006, Digital audio over ATM networks, has been reaffirmed

Mon, 17 Oct 2011 01:00:00 -0700

AES47-2006 (r2011), AES standard for digital audio - Digital input-output interfacing - Transmission of digital audio over asynchronous transfer mode (ATM) networks, has been reaffirmed.

This document specifies the method of carrying multiple channels of audio in linear PCM or AES3 format in calls across an asynchronous transfer mode (ATM) network to ensure interoperability. The specification includes the method of conveying information concerning the format and sampling frequency of the digital audio signal when setting up the calls.

AES51-2006, Transmission of ATM cells over Ethernet physical layer, has ben reaffirmed

Mon, 17 Oct 2011 01:00:00 -0700

AES51-2006 (r2011) AES standard for digital audio – Digital input-output interfacing – Transmission of ATM cells over Ethernet physical layer has been reaffirmed

This standard specifies a method, also known as “ATM-E”, of carrying asynchronous transfer mode (ATM) cells over hardware specified for IEEE 802.3 (Ethernet). It is intended as a companion standard to AES47 (Transmission of digital audio over ATM networks), to provide a standard method of carrying ATM cells and real-time clock over hardware specified for Ethernet.

AES52-2006, unique identifiers in AES3 transport stream, has been reaffirmed

Mon, 17 Oct 2011 01:00:00 -0700

AES52-2006 (r2011) AES standard for digital audio engineering — Insertion of unique identifiers into the AES3 transport stream has been reaffirmed.

The AES3 transport stream continues to be used extensively in both discrete and network based audio systems alongside audio stored as files. Audio content is moving towards being handled by asset management systems and descriptive metadata associated with that content is also being stored within systems. In order to provide a mechanism for AES3 transport streams to have similar abilities to work with content management systems, some form of unique label is required which can provide the link with these systems. One of the unique labels currently standardised in the media industry is the SMPTE UMID while another commonly used in the Information Technology area is the IEC UUID.

This standard specifies the method for inserting unique identifiers into the user data area of an AES3 stream. This specifically covers the use of UUID as well as a basic or extended SMPTE UMID.

AES53-2006, Sample-accurate timing in AES47, has been reaffirmed

Mon, 17 Oct 2011 01:00:00 -0700

AES53-2006 (r2011) AES standard for digital audio — Digital input-output interfacing — Sample-accurate timing in AES47 has been reaffirmed.

This document specifies how the timing markers specified in AES47 may be used to associate an absolute timestamp with individual audio samples. AES47 specifies a format for the transmission of digital audio over asynchronous transfer mode (ATM) networks. A recommendation is made to refer these timestamps to the SMPTE epoch which in turn provides a reference to UTC and GPS time.