FYI for all - matrix encoding (Pro Logic / Pro Logic II) is most definitely still used in production. I also guarantee that the bulk of programming that is still delivered in two channel is matrix encoded as well, including many commercials. It's still a very viable way to get some surround information passed through to consumer receivers, especially given the fact that many consumers are not savvy enough to set up their receivers for discrete surround.
Also, many promos and commercials that are mixed for stereo are processed in some way through the matrix encoders so that we'll know what the end product will sound like when the end user leaves his receiver set to decode.
Back to the OP - you are correct about the labeling. However, I am suspect about the reasons why they wouldn't have accepted "Stereo" as a label since that is more accurate than either of the other two...
--- In Avid-L2@yahoogroups.com, "johnrobmoore" <bigfish@...> wrote:
>
> I did label it as Stereo but they want either Lt,Rt or Lo,Ro. I've been told that because there is not dolby phase matrixing for the older dolby pro logic Lo,Ro is correct as in Left only and Right only. I still watch TV at home with my dolby pro logic receiver and it still works on prime time episodics and others so I believe it is still in use. I do agree stereo left and right is accurate but they want Lo,Ro and that's what they are going to get. If you ask me it's much to do about nothing but then they receive many different audio configurations depending on the requirements of a particular show and at least this way it will be consistent with the others and their cataloging of assests.
>
> --- In Avid-L2@yahoogroups.com, Dennis Degan <DennyD1@> wrote:
> >
> >
> > On Oct 24, 2011, at 4:05 PM, John Moore wrote:
> >
> > > In delivering a 2.0 mix that is not dolby pro logic a network wants
> > the channel assignment to reflect Lt,Rt or LoRo. Since we are not
> > doing any dolby matrixing on the mix the channels are really just
> > stereo left and right. I will therefore slate them as Lo,Ro. It just
> > seems to me that the Lo,Ro is for a downmix or fold down which we
> > haven't really done and seems inaccurate to label them Lo,Ro. Is
> > there any difference in Lo,Ro and stereo left,right?
> >
> > I say:
> >
> > I've never heard of "LoRo" before. If you're sending them a stereo
> > mix derived from a 5.1 mix, it should be labeled "LtRt" (assuming that
> > the mixdown contains all the tracks; front, center, rear surround and
> > LFE). The fact that it's not matrixed for Pro Logic shouldn't be an
> > issue.
> >
> > John also said:
> >
> > > Lt/Rt is a downmix suitable for decoding with a Dolby Pro Logic
> > upmixer to obtain 5.1 channels again. Lt/Rt is also suitable for
> > stereophonic sound playback on a hi-fi or on headphones as it is.
> > Lt = L + -3dB*C + -3dB*(-Ls -Rs)
> > Rt = R + -3dB*C + -3dB*(Ls + Rs)
> > (where Ls and Rs are phase shifted 90�)
> > [edit] Left only/Right only (Lo/Ro)
> > Lo/Ro is a downmix suitable when mono compatibility is required. Lo/Ro
> > destroys front/rear channel separation information and thus a Dolby
> > Pro Logic upmixer will not be able to properly extract 5.1 channels
> > again.
> >
> > I offer:
> >
> > Even though your above specifications appear to be accurate, I
> > wouldn't be so literal about it. Nobody uses Pro Logic anymore.
> > Further, Dolby Pro Logic (and its successor, Pro Logic II) do not
> > extract 5.1 channels from LtRt. Pro Logic only extracts L,R,C, and S;
> > only one surround channel and no separate LFE channel. You can never
> > get 5.1 from an LtRt Pro Logic mix.
> > Why not just label it as it is: "STEREO"? It's an accurate
> > description of the audio. Surely they have STEREO in the specs.
> >
> > Dennis Degan, Video Editor-Consultant-Knowledge Bank
> > NBC Today Show, New York
> >
>
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