The “upconverted” sound from

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May 29, 2011 at 9:08 am #4114
oliverredfox
Participant

    The “upconverted” sound from your USB device when set to 5.1 is most likely faked and not true ProLogic sound.

    Now on the other hand, when you send stereo output and use ProLogic (I run Dolby Pro Logic IIx) on your stereo, it is actually taking information that was encoded into the stereo signal to figure out additional speaker channels.  ProLogic has been around for a long time, even your old VHS tapes would have its sound encoded that way.

    What you had previously been asking about is Dolby Digital.  DD has the information digital encoded with each speaker given it’s own stream.  This allows for even more information to be given per speaker resulting in more separation and range.

    So you are hearing true surround sound, you just aren’t hearing Dolby Digital surround sound.  Basically ProLogic uses analog audio tricks (phasing, sync, etc) to hide the information for surround in 2 channels, while DD transmits all the channels individually.  I hope that helps explain it for you (a bit sleepy as write this).