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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
Naive single-band in-phase decoder for a square loudspeaker layout. A basic Ambisonic decoder is very similar to a set of virtual microphones. For perfectly regular layouts, a simplified decoder can be generated by pointing a virtual cardioid microphone in the direction of each speaker. Here is a square:
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.
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.
The Trifield process is a form of audio rendering in which a conventional two-channel signal is decoded (using Ambisonic principles) to an additional number of loudspeakers, typically three in the form of a Left-Centre-Right front stage. The technique provides significant additional image stability, especially when the listener is moving or off ...
Ambisonic mixing equipment. Matrix H was developed by BBC engineers in 1977 to carry quadraphonic sound via FM radio in a way which would be most compatible with existing mono and stereo receivers. [31] Quadraphonic test programmes were made for BBC Radio 3 and BBC Radio 4, including plays and The Proms. [32] The existing matrix formats were ...
Ambisonic UHJ mixing equipment. The BBC later cooperated with the developers of Ambisonics to produce BBC/NRDC System HJ.This was based on tolerance zones designed to include modified versions of both Matrix H and the prototype two-channel encoding of Ambisonics, known as System 45J.