ECMA-407 is the world's first approved international 3D audio standard for the unrestricted delivery of channel-based, object-based and scene-based signals up to NHK 22.2 developed by Ecma TC32-TG22 in close cooperation with France Télévisions, Radio France, École Polytechnique Fédérale de Lausanne and McGill University in Montreal.

ECMA-407 uses inverse coding in the time domain, an invention by the Swiss-Austrian mathematician Clemens Par, and shows lowest spatial bitrates ever achieved (for instance, several minutes of NHK 22.2 may be represented by an encapsulated data package of 100 bytes).

In addition it provides reference and guidance on how to incorporate further components to form a scalable multichannel coding system for audio data compression.

It may be either based on statistical methods, which require extensive computational power, or on the discovery of algebraic invariants with Gaussian processes by Clemens Par in 2010 (after having been averted to this classical problem by Rudolf E. Kálmán), based on German mathematician David Hilbert's published proof of the invariant field in 1893 and the apolarity behavior of algebraic cones as extensively studied by Grace and Young in 1903.

ECMA-407 uses modern tools such as loudness according to ITU-R or the European Broadcasting Union and electronic fingerprint that allow internal and external synchronization, for example, with video, with additional services or with "second screens".

Its world premiere was an ECMA-407 satellite test carrier, which was established in cooperation with France Télévisions, SES, Ecma International and other partners for the "Future Zone" of IBC in Amsterdam in September 2014.