Surround sound

Surround Sound is the concept of expanding the spatial imaging of audio
playback from 1-dimension (mono/Left-Right) to 2D or 3D.

This is often performed for a more realistic audio environment, actively
implemented in cinema sound systems, technical theatre, home entertainment,
video arcades, computer gaming, and a growing number of other applications.

A currently popular form of surround sound (as of 2003) is Dolby 5.1
Surround Sound.

There are methods of using 1-dimensional (stereo) output to emulate a
surround environment.

Emulation Methods

   * QSound
   * Dolby Pro Logic

Surround sound is not limited to placement of speakers along a flat plane.
Vertically-located audio sources can be considered.

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