Dolby Surround (or ProLogic) is an analog audio encoding method that provides four-channel surround sound (left front, right front, center, rear). The separation between the channels is not as well-defined as with Dolby Digital and the single rear channel minimizes the effect of ‘positional audio’. That is, it’s very difficult to make something sound like it’s coming from behind your left shoulder. With Dolby Digital, such positional information is directly encoded in the digital signal. The game Halo makes excellent use of positional audio and provides a great Dolby Digital demonstration.

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