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Ambisonic Decoder – this accepted both horizontal (WXY) B-format and 2-channel UHJ and decoded it to four speaker feeds with configurable array geometry. It is understood that versions of these units were subsequently made available in the late 1990s by Cepiar Ltd along with some other Ambisonics hardware.
In practice, a real Ambisonic decoder requires a number of psycho-acoustic optimisations to work properly. [ 4 ] Currently, the All-Round Ambisonic Decoder (AllRAD) can be regarded as the standard solution for loudspeaker-based playback, [ 5 ] and Magnitude Least Squares (MagLS) [ 6 ] or binaural decoding, as implemented for instance in the IEM ...
Ambisonic Surround Sound FAQ (Sections 17 and 18 for hardware decoders) Ambisonia website Bruce Wiggins's WAD decoders for 4.0, 6.0 and 8.0 are nearly Classic Ambisonic Decoders and easy to use plugins for Windows Media Player. B2X Plug-Ins B2D, B2G and B2Stereo software decoders, in VST and Audio Unit formats, for Mac OS X
Goodwin (2009) has suggested a slanted octahedron with separate front center (which he calls 3D7.1) [17] as an alternative way of using 7.1 systems to achieve with-height Ambisonic reproduction in games, and to allow reasonably accurate native 5.1 playback. An OpenAL game audio backend and decoder for this setup is commercially available. [18]
Ambisonic UHJ format is a development of the Ambisonic surround sound system designed to be compatible with mono and stereo media. It is a hierarchy of systems in which the recorded soundfield will be reproduced with a degree of accuracy that varies according to the available channels.
For instance, provided the W, X, Y and Z signals are recorded separately, it is possible to pinpoint the microphone to a certain response from the audience even after recording. Examples of software that perform these calculations are Visual Virtual Microphone, [4] SoundField's Surround Zone [5] and Ambisonic Studio's B2X decoders [6] plug-ins.
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Matrix decoding is an audio technology where a small number of discrete audio channels (e.g., 2) are decoded into a larger number of channels on play back (e.g., 5). The channels are generally, but not always, arranged for transmission or recording by an encoder, and decoded for playback by a decoder.