In general, a head-related transfer function based virtual sound technology inherently carries a sweet spot and the listener positioned outside of the sweet spot cannot feel the surround sound effect well. This paper presents a novel virtual sound rendering method which allows the listener located at an arbitrary position to feel a good impression of surround sound by using only 2-channel speakers. The smart virtual sound rendering system consists of a listener position tracking system, which uses infrared and ultrasonic sensors, and an adaptive virtualizer algorithm optimized for the listener position. A TV viewer sitting at an arbitrary position can enjoy a good surround sound by using this new method which can be activated by using the remote controller.
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