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What is "surround sound"?
Surround sound really began in the 1960's with the development of quadraphonic sound. This was a system of encoding four channels of information within a two-channel recording. The result was that ambient (or effects) sounds could be imbedded in a two-channel recording that could be played by a normal record player and passed through to a receiver or amplifier with a Quadraphonic decoder. This decoder would then pass the signals to four separate speakers. Today, surround sound is very similar. In its basic form (Dolby Surround) four sound channels, right, left, center and rear are encoded into a two channel audio track and played back with a surround decoder. This decoder sends the individual sounds to their respective speakers and the rear channel adds the "surround" effect, with sounds coming from behind the listening position.
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