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DMX decoding driver converts universal DMX512/1990 digital signal to PWM signal, which can be controlled by DMX512 console. The decoder allows for 256 brightness levels. Maximum load is 15 amps per channel. Includes male and female 3-pin XLR connectors.
Main article:Ambisonic UHJ format is a development of the 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. Although UHJ permits the use of up to four channels (carrying full-sphere with-height surround), only the 2-channel variant is in current use (as it is compatible with currently-available 2-channel media). In Ambisonics, UHJ is also known as 'C-Format'. Contents.The UHJ hierarchy is the standard format for use in the studio. While itis possible to distribute B-Format recordings for decoding and listening by end-users, this is only starting to be more widespread with the advent of software-based players. Traditionally, Ambisonic recordings have been distributed in the form of 2-channel discs, CDs etc.
Using the 2-channel version of the UHJ encoding hierarchy, which, unlike B-Format, is designed to be compatible.UHJ was developed by the Ambisonic team, incorporating work done bythe BBC (on their system, ) and (on Nippon Columbia's system) and others, and building on the then-current version of Ambisonics, System 45J. The initials indicate some of sources incorporated into the system: U from Universal (UD-4); H from Matrix H; and J from System 45J. The theoretical path from B-format to the various stereo/mono-compatible UHJ variants.
In fact many mixing applications went straight from multitrack to 2-channel UHJ before the advent of digital audio workstations and current Ambisonic mixing developments.UHJ is a unique hierarchical system of encoding and decoding directional sound information within Ambisonics technology. Depending on the number of channels available, the system can carry more or less information - but at all times, UHJ is fully stereo- and mono-compatible. Up to four channels (L, R, T, Q) may be used.In its most basic form, 2-channel (L, R) UHJ, horizontal (or 'planar') surround information can be carried by normal stereo signal channels – CD, FM or digital radio, etc. – which may be recovered by using a UHJ decoder at the listening end. Summing the two channels gives a highly compatible mono signal which in fact is a more accurate representation of the two-channel version than summing a conventional 'panpotted mono' source. If a third channel (T) is available, this can be used to give improved localisation accuracy to the planar surround effect when decoded via a 3-channel UHJ decoder. The third channel does not have to have full audio bandwidth for this purpose, leading to the possibility of so-called '2½-channel' systems, where the third channel is bandwidth-limited to 5 kHz.
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The third channel can be broadcast via FM radio, for example, by means of phase-quadrature modulation. This configuration was tested by the Independent Broadcasting Authority (IBA) in the United Kingdom as a method of broadcasting surround recordings. 2½ or 3-channel UHJ delivers the same accuracy as 3-channel (WXY) B-Format. Adding a fourth channel (Q) to the UHJ system allows the encoding of full surround sound with height, known as Periphony, with a level of accuracy identical to 4-channel B-Format.Although there are some compromises as far as accuracy of localisation is concerned in the 2-channel UHJ system, 2-channel UHJ is the format commonly used for distribution of Ambisonic recordings. 2-channel UHJ recordings can be transmitted via all normal stereo channels and any of the normal 2-channel media can be used with no alteration.It is stereo compatible in that, without decoding, the listener perceives a stereo image, but one that is significantly wider than conventional stereo (see ).
The left and right channels can also be summed for a very high degree of mono-compatibility. Replayed via a UHJ decoder, the surround capability is revealed.UHJ HierarchyNumberof channelsDecoder?CapabilitiesTypicalapplicationsChannelsB-FormatequivalentOriginaldesignation.4YesFull-sphere surroundDVD, HD discLRTQWXYZPHJ3YesFull horizontal surroundDVD, HD discLRTWXYTHJ'2½'YesFull horizontal surroundFM RadioLRband-limited TWXYSHJ2YesHorizontal surroundCD, Stereo RadioGeneral 2-channel mediaLR-BHJ2NoStereoCD, Stereo RadioGeneral 2-channel mediaLR-1NoMonoRadioLR (summed)-.These designations are seldom used today Decoding UHJ. Basic outline structure of a UHJ decoder.A UHJ decoder, primarily for the 2-channel format, was the original component required for consumer experience of Ambisonics. Further information: Super stereo A disadvantage of the use of 2-channel UHJ is that to obtain a surround effect the listener requires an Ambisonic UHJ decoder. These have traditionally not been widely available, but have become so as plugins on modern PC equipment. However, listeners to a 2-channel UHJ signal without a decoder notice a 'super stereo' effect.Because of the inter-channel phase relationships inherent in the encoding scheme, the listener experiences stereo that is often significantly wider than the loudspeakers.At the same time, a feature of domestic UHJ decoders has been the inclusion of a super stereo feature. This allows conventional stereo signals to be 'wrapped around' the listener, using some of the capabilities of the decoder.
A control is provided that allows the width to be varied between mono-like and full surround. This provides a useful capability for a listener to get more from their existing stereo collection.Both features were used as selling points in the early days of Ambisonics, and especially Ambisonic mixing. They helped to overcome a 'chicken and egg' situation where record companies were reluctant to release Ambisonic recordings because there were few decoders in the marketplace, while hi-fi manufacturers were unwilling to licence and incorporate Ambisonic UHJ decoders in their equipment because there was not very much mainstream released content. On the one hand, it was worth having a decoder because you could get more out of your existing (stereo) record collection; while on the other it was worth making UHJ recordings because even people without a decodercould gain appreciable benefits.Undecoded UHJ In a world in which the majority of listeners do not have Ambisonic decoders, most listeners to 2-channel UHJ-encoded material will be listening undecoded.Some engineers have preferred the perceived additional spaciousness, width and stability of undecoded 2-channel UHJ to conventional panpotted stereo mix techniques. The late, for example, used the (a simple method of ) extensively and produced several series of UHJ recordings even though he was fully aware that few people would ever hear them decoded, and mixed material deliberately for the best undecoded result. (November 1985). 'Ambisonics in Multichannel Broadcasting and Video'.
Journal of the Audio Engineering Society. 33 (11): 859–871. (11 December 1975). 'Compatible 2-channel Encoding of Surround Sound'. Electronics Letters. Reprinted by the. 11 (25/26).; Shiga, Takeo (June 1972).
Journal of the Audio Engineering Society. 20 (5): 346–360. Retrieved 28 September 2018. Daubney, Chris (August 1982). 'Ambisonics - An Operational Insight'. Studio Sound: 52–58.
(1973). 'Periphony: With-Height Sound Reproduction'. Journal of the Audio Engineering Society. 21 (1): 2–10. Peter, Fellgett (August 1975).
Part One: General System Description'. Studio Sound. 1: 20–22, 40.
(October 1975). Part Two: Studio Techniques'. Studio Sound: 24–30, 60.External links. website., a list of UHJ record releases, broadcasts and other Ambisonic content. at the University of Parma. B2Stereo/UHJ, software UHJ encoder, in VST and Audio Unit formats, for Mac OS X., an extensive list of published references and commentaries. at the University of York.
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