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by Gameboy42 on October 9th, 2003

Gameboy42

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What are the different surround sound formats?

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  • by Gameboy42 on October 9th, 2003

    Gameboy42

    Dolby Digital (AC-3)

    Unlike most formats this one is digital, rather than analog. Signals for each speaker channel are transmitted separately, ensuring that each sound channel is reproduced exactly as it was recorded. There is a dedicated subwoofer channel as well.

    DTS Digital Surround

    Similar to Dolby Digital in that all signals are digital and separated by channel, but in DTS the signals are not compressed as much as they are in Dolby Digital. In theory, Dolby's compression causes more loss of signal quality than DTS, but most listeners would probably not be able to tell the difference.

    Dolby Pro Logic / Pro Logic II

    Dolby Pro Logic and PL II devices can simulate surround sound from a standard 2-channel recording. Of course, this will not provide the quality or imaging that surround formats will, but it does a passable job of playing non-surround recordings on a surround sound system. PL1 will separate a 2-channel recording for a 5 channel system (2 front, 2 rear, 1 center), and PL2 will separate it for a 5.1 system (add a subwoofer).

    Recordings can be encoded for Dolby Pro Logic in order to take advantage of a 5 speaker system. PL2-encoded recordings work with a 5.1 system and are comparable with the performance of a Dolby Digital system. PL2's reproduction quality and staging are much better than PL1.

    Of course, more formats will emerge in time...

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