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JonD Unregistered guest | i understand Dolby Digital and DTS - digital 5:1 or 6:1 encoding, complete channel separation, etc. - makes complete sense to me. but i don't get Dolby ProLogic II (or any other analog surround sheme). my understanding is that PLII attempts to separate a 2 channel analog input into 5:1 channels via a DSP, correct? but does the analog signal have to be PLII encoded or will PLII attempt to separate any 2 channel signal? if it's the former, how does the PLII encoding work? does it use some sort of modulation scheme (FM?) embedded within the signal? thanks for the help. |
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HTIB Help Unregistered guest | This page has a lot of info on Dolby Pro Logic II, check it out... http://www.area450.com/homecinema/dpl2.htm -Danny |
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dforrest Unregistered guest | Will the analog signal output on an optical cable from receiver to DVD player? |
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HTIB Help Unregistered guest | Could you rephrase your question dforrest? |
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JonD Unregistered guest | HTIB Help, thanks for the link, but I didn't find the article very helpful. sorry. Like most HT reviews, it offers little more than breathless recaps of the same old DVD experiences....I was a EE in college and understand some of the terminology/technology in signal processing and am more interested in how PLII works than what the 10,000th person thinks about how amazing Star Wars/Gladiator/SPR sounds like in various surround modes... that aside, maybe my question is more technical. i'll try again... is there such a thing as Dolby PLII *encoding* of the source material (in analog) OR is Dolby PLII simply a DSP algorithm for (artificially) deriving a 5 channel output from a 2 channel analog signal? people talk about PLII *decoding* but, maybe it's semantics, but i don't think you can *decode* something that has never been *encoded*. i have a feeling that PLII is stricly a DSP algorithm, not a decoding schema... thanks all! |
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JonD Unregistered guest | i think i might have found my own answer.. www.dolby.com/professional/pro_audio_engineering/solutions_surround.html so it looks like there is a PLII encoding scheme that translates 5 channels into 2 at the source before transmission. then the A/V receiver decodes it back into 5 channels... anyone know how this encoding scheme works (in signal processing terms)? thanks. |
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dforrest Unregistered guest | As I understand it, PL ll is and analog signal. Do I need to use analog inter-connects from DVD player to receiver or will the signal go over my Optical cable? thanks in advance. |
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JonD Unregistered guest | that's a very good question, dforrest. i'd like to know the answer as well... |
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HTIB Help Unregistered guest | My receiver supports PL II. I have my DVD player hooked up to it using a digital coaxial cable. When I put in a movie that has DD that is not 5.1, it works. So from my experience yes, the signal should go through your optical cable |
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Bronze Member Username: ClaudermilkPost Number: 49 Registered: Sep-04 | I knew that on my DVD player the analog signal was passing through the coax digital. So, I had to test this out & played a CD on the PS2 (audio is only hooked up through an optical)--and yes, it worked fine. |