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Dolby Pro Logic
Developed in the mid-1980s by Dolby Laboratories, Dolby Pro Logic is essentially the domestic version of Dolby's theatrical 'Dolby Stereo' system. Currently the defacto standard for home theater, Pro Logic extracts four channels of information (left, center, right and surround) from 'Dolby Surround' encoded two channel material on DVD, LaserDisc, VHS, CD, MTS etc.
Dolby Surround soundtracks include full-range left, center and right channels, and a limited range mono surround channel (100Hz to 7kHz). Not all channels can contain all frequencies at the same time, and channels must interact with one another to varying degrees. To overcome these limitations, fully discrete systems such as Dolby Digital and DTS Digital Surround were developed.
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