Vocals/Dialogue completely absent from center channel in song - AVS Forum
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post #1 of 6 Old 04-19-2010, 01:22 AM - Thread Starter
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In Ob-la-Di-Ob-la-da by the Beatles played through a Dolby Pro Logic decoder- no not II, the one from 1987 - the vocals are completely absent from the center channel and are mapped evenly to all the other channels, which with PL1 are left, right, and surround. Old stereo music is interesting already beacuse of the exreme stereo panning they did a lot back then when stereo was a new concept and they really didn't know what they were doing with it. Anyone know anything more about this? Or other songs like this?

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post #2 of 6 Old 04-19-2010, 09:29 AM
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Originally Posted by RCA Dimensia View Post

In Ob-la-Di-Ob-la-da by the Beatles played through a Dolby Pro Logic decoder- no not II, the one from 1987 - the vocals are completely absent from the center channel and are mapped evenly to all the other channels, which with PL1 are left, right, and surround. Old stereo music is interesting already beacuse of the exreme stereo panning they did a lot back then when stereo was a new concept and they really didn't know what they were doing with it. Anyone know anything more about this? Or other songs like this?

Dolby Pro Logic is by default Left right and rear surrounds. Dolby Pro Logic does not even handle LFE. The fact that you don't hear anything out of the center channel means that everything is working as it is supposed to.
It was not till PLII that they added support for 6 channel audio.
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post #3 of 6 Old 04-19-2010, 10:14 AM - Thread Starter
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No no no, PL1 uses the center channel!!! You're thinking of 3 stereo or something. And I didn't say there was nothing coming out of the center, there was music, and there were vocals coming out of it of course on basically every other song. I'm saying that this SONG is unique becuase it is mixed that way. It's on my laptop but burned off the ONE (greatest hits) album.

Also, becuase my receiver uses Dolby Digital (5.1) in DVD mode, it uses all 6 speakers with Dolby Pro Logic 1!!!! It's a really unique receiver. It's low end but that adds to some of the uniqueness.

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post #4 of 6 Old 04-19-2010, 10:24 AM
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Originally Posted by RCA Dimensia View Post

No no no, PL1 uses the center channel!!! You're thinking of 3 stereo or something. And I didn't say there was nothing coming out of the center, there was music, and there were vocals coming out of it of course on basically every other song. I'm saying that this SONG is unique becuase it is mixed that way. It's on my laptop but burned off the ONE (greatest hits) album.

Also, becuase my receiver uses Dolby Digital (5.1) in DVD mode, it uses all 6 speakers with Dolby Pro Logic 1!!!! It's a really unique receiver. It's low end but that adds to some of the uniqueness.

Oops, I was thinking Dolby Surround, not PLI. I think the reason for the audio only coming from the sides is that there is bit information on the audio track that indicates that is has to be played on left and right channel, so that in certain times it can be only left or only right as it was mixed.
The Dolby PLI will will copy any sound that does not have a distinct location information to the Center and surround channels. From looking into it a bit more this seems to be the reason why.At least this is what I get from the limited information with brief research on PL1. I skipped PL1 as I went from Dolby Surround straight to Dolby Digital/PLIIx.
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post #5 of 6 Old 04-19-2010, 04:23 PM - Thread Starter
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Play the song on your system; I'll bet it will be the same way; it's probably just mixed that way. I'm not at all saying there's a problem or asking if something's wrong with my receiver or my center channel's not connected (lol in another forum someone suggested that); I'm just saying it is very unique for being that way. It adds to the live upbeat light sound the song is going for anyway. It's just funny becuase I wrote center channel on Wikipedia. I also just recently made surround channels, and am working on height channels.

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post #6 of 6 Old 04-19-2010, 04:58 PM
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With Pro Logic decoders, if there is a timing difference between the same sounds in the left and right channels, that sound will not be identified as 'center' and repositioned from the left/right channels. Lexicon used to call this 'azimuthal error', and some "really smart" decoders could 'delay buffer' both the left and right input channels in order to look for inadvertent inter channel timing differences between what was supposed to be common (center channel) content. As a human(?), you may think the vocals from each Pro Logic'd channel are the same, but your decoder knows the truth--that they are in fact different!

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