Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A3D (Aureal 3-Dimensional) was a technology developed by Aureal Semiconductor for use in their Vortex line of PC sound chips to deliver three-dimensional sound through headphones, two or even four speakers. The technology used head-related transfer functions (HRTF), which the human ear interprets as spatial cues indicating the location of a particular sound source. Many modern sound cards and PC games incorporated A3D via license from Aureal. Due to Aureal's acquisition (see below) the A3D technology is now part of the intellectual property of Creative Labs and some features may be licensed under different product names such as EAX.

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