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Multichannel horizontal surround sound with a regular loudspeaker configuration
Published in Bosun Xie, Spatial Sound, 2023
Sound field signals in Ambisonics are extended from the first order to higher orders to improve the accuracy in spatial information reproduction, which are termed higher-order Ambisonics (HOA; Xie X.F., 1978b; Xie and Xie, 1996; Bamford and Vanderkooy, 1995; Daniel et al., 1998, 2003). For the first-order horizontal Ambisonics, the signal of the loudspeaker at azimuth θi is given in Equation (4.3.15) and can be written as the linear combination of a target-azimuthal-independent component W = 1 and a pair of first-order target-azimuthal harmonics X = cosθS and Y = sinθS: AiθS=AtotalW+D11θiX+D12θiY=Atotal1+D11θicosθS+D12θisinθS, where D11θi=bcosθiD12θi=bsinθi.
Reflections on sonic digital unreality
Published in Digital Creativity, 2019
Sara Pinheiro, Matěj Šenkyřík, Jiří Rouš, Petr Zábrodský
Ambisonic systems, a higher-order multichannel system, expand stereophonic reproduction by simulating the position of the sound sources in between three or more points that will correspond to the position of loudspeakers. Sound sources remain on a virtual plane defined by the position of the loudspeakers in the physical space. The system’s decoders can accommodate different positions for the loudspeakers, just so it still achieves the intended reproduction predominantly for the sweet spot. But in the ideal hemisphere layout, the awareness of phantom sources disappears to a certain degree. Some sources can be perceived between the loudspeakers psychoacoustically, based on the amplitude and time delays between them. The sounds will still be dislocated to a listener moving through the space, mainly because of the phasing in the distribution (Monro 2006). Due to the inability to locate the source properly and the effect of unnatural coloration of the sounds (Hameed and Ville 2004), the listener will experience a shifted environment outside the sweet spot. Yet, ambisonic decoders distribute sound according to a defined position of the loudspeakers and that position can be changed to accommodate arrays within the irregular distribution. In practice, removing the original sweet spot is possible by dislocating the position of the loudspeakers in the ambisonic decoder, which also changes the timbre of the dislocated sounds.