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The most useful of these is the Square 4.0 decoder. The coordinate system used in Ambisonics follows the right hand rule convention with positive X pointing forwards, positive Y pointing to the left and positive Z pointing upwards.
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:
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]
A popular and unfortunate misconception is that Ambisonic recordings can only be made with the SFM, and as a result there is a widespread, and erroneous, belief that Ambisonics can only be used to capture a live acoustic event (something that accounts for a tiny proportion of modern commercial recordings, the vast majority of which are built up in the studio and mixed from multitrack).
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.
Another ambient technique is the IRT (Institut für Rundfunktechnik) cross. Here, four cardioid microphones, 90 degrees relative to one another, are placed in square formation, separated by 21–25 cm. [26] [28] The front two microphones should be positioned 45 degrees off axis from the sound source. This technique therefore resembles back-to ...
The Ambisonic components up to third order. Horizontal-only recordings or mixes are the most commonly encountered mixed-order signals, because the horizontal plane is by far the most likely location of musical or other performers, and the vast majority of playback systems deployed today does not have height capability.
In addition, Nimbus recordings are now often recorded in Ambisonic B-Format, which can be decoded directly to a multichannel surround format compatible with conventional multichannel discs such as DVD or DTS-CD. A large sub-label of Nimbus Records is the vocal series Prima Voce. This label specialises in the transfer of vocal records on 78 rpm ...