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Controlling the Apparent SourceSize in Ambisonics Using Decorrelation Filters

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The apparent source extent, de?ned as the perceived sound source size, is a common parameter for 3D audio applications, such as VR, 3D cinema and spatialized music composition. Here, we present a new method for achieving this effect for Ambisonics, which targets the minimization of the interaural cross-correlation coef?cient. This is achieved by reducing the Ambisonic order and rotating decorrelated copies of the original stream into an equidistant con?guration. Comparisons to previous methods as well as different ?lter parameters and parameter curves are discussed for both binaural and multichannel speaker systems. Preliminary results indicate that this method is able to stable images, particularly in the gradual change in source size and listening area stability.

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AES - Audio Engineering Society