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Full Description

In traditional channel-based audio mixing, sound elements are mixed to the fixed speaker channels, i.e. left, right, centre, left surround and right surround. This paradigm is well known and works when the channel configuration at the decoding end can be predetermined, or assumed with reasonable certainty to be 2.0, 5.X, or 7.X.

However, with the popularity of new speaker setups, no assumption can be made about the speaker setup used for playback. Therefore, channel-based audio does not offer a sufficient method for adapting a presentation where the source speaker layout does not match the speaker layout at the decoding end. This presents a challenge when trying to author content that plays back well independently to the speaker configuration.

In object-based audio, individual sound elements are delivered to the playback device, where they are rendered based on the used speaker layout. Because individual sound elements can be associated with a much richer set of metadata, giving meaning to the elements, the method of adaptation to the speaker configuration reproducing the audio can provide better information regarding how to render to fewer speakers.

Enhanced AC-3 (E-AC-3), defined in ETSI TS 102 366 [1], is a widely used format for transmission of channel-based audio content. When the goal is to transport object-based audio in an environment where compatibility with pre-existing devices is paramount, joint object coding (JOC), as specified in the present document, can be used in conjunction with E-AC-3.

Document structure
The present document is structured as follows:
  • Clause 4 explains the concept of object-based audio and specifies the decoder interface.
  • Clause 5 specifies object audio metadata (OAMD), the object-based audio metadata format.
  • Annex B specifies how OAMD can be converted to an audio definition model (ADM), providing an interconnection to the professional metadata generation and monitoring.
  • Clause 6 specifies the JOC tool that converts the output of an E-AC-3 decoder to objects, as specified in ETSI TS 102 366 [1].
  • Clause 7 specifies the quadrature mirror filter bank (QMF) tool that is used by the JOC tool.
 

Document History

  1. ETSI TS 103 420


    Backwards-compatible object audio carriage using Enhanced AC-3

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  2. ETSI TS 103 420

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    Backwards-compatible object audio carriage using Enhanced AC-3

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