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Thread: Confused about PLII |
    
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| Posted on Monday, October 11, 2004 - 03:36 pm: |
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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 |
| Posted on Monday, October 11, 2004 - 05:17 pm: |
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This page has a lot of info on Dolby Pro Logic II, check it out...
http://www.area450.com/homecinema/dpl2.htm
-Danny |
dforrest Unregistered guest |
| Posted on Monday, October 11, 2004 - 05:49 pm: |
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Will the analog signal output on an optical cable from receiver to DVD player? |
HTIB Help Unregistered guest |
| Posted on Monday, October 11, 2004 - 07:27 pm: |
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Could you rephrase your question dforrest? |
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| Posted on Tuesday, October 12, 2004 - 10:19 am: |
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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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| Posted on Tuesday, October 12, 2004 - 11:11 am: |
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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. |
dforrest Unregistered guest |
| Posted on Tuesday, October 12, 2004 - 11:17 am: |
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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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| Posted on Tuesday, October 12, 2004 - 12:44 pm: |
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that's a very good question, dforrest.
i'd like to know the answer as well... |
HTIB Help Unregistered guest |
| Posted on Tuesday, October 12, 2004 - 11:28 pm: |
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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 |
Bronze Member Username: Claudermilk
Post Number: 49
Registered: Sep-04
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| Posted on Wednesday, October 13, 2004 - 09:37 pm: |
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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. |
