What is the difference between Dolby Surround, Dolby Pro Logic, Dolby Digital 5.1 and DTS 5.1? Is one better than the other?
Dolby Surround involves encoding four channels of information – Front Left, Center, Front Right, and Rear Surround into a two channel signal. A decoding chip then decodes the four channels and sends them to the appropriate destination, the Left, Right, Rear, and Phantom Center (center channel is derived from the L/R front channels). The result is a more balanced listening environment in which the main sounds derive from the left and right channels, the vocal or dialog emanates from the center phantom channel, and the ambience or effects information comes in from behind the listener. Dolby Pro-Logic adds hardware elements in the decoding chip that emphasize important directional cues in a movie soundtrack. This process, although not important in musical recordings is very effective for film soundtracks and adds more accuracy to effects such as explosions, planes flying overhead, etc. There is greater separation between channels.
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