National Semiconductor

"3D audio" or "3D sound" refers to reproduction of natural human spatial auditory cues in loudspeaker or headphone listening situations. Stereo enhancement is to widen the stereo sound field, thereby immersing the listener in a cleaner, richer sound experience. From a practical point of view, stereo enhancement is intended to spread the stereo field into a 180 degree arc in front of the listener. The document focuses on stereo enhancement.