Speech recognition is sometimes used to provide a hands-free input alternative to the mouse and keyboard. These notes are concerned with the output of spatial sound.
Conventional stereo can easily place a sound in any spot between the left and right loudspeakers.
These notes explain how this can be done. They were originally prepared for an NSF-sponsored course entitled Human Computer Interface Design . Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted with or without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and full citation on the first page.