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 Post subject: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 31 Oct 2019, 13:34 
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Hello everyone!

Since the different flavors of soundtracks on DiscoVision/LaserVision/LaserDisc seems to be a somewhat complicated topic for new collectors or people trying to jump from/to PAL and NTSC or confused about the different soundtracks of MUSE/Hi-Vision discs, I started a draft help section here:

https://www.lddb.com/help_sound.php

For each example, I'm trying to give the earliest commercial release as possible (first stereo, first CX, first Digital, etc.).

I still have a big section on AC3 and DTS to draft, and then move to Hi-Vision (A-mode, B-mode, EFM, etc.).

Could you take a look at the draft and make some comments if I made mistakes or over-simplified things?

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 31 Oct 2019, 14:51 
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Well, that's pretty good actually.
Not too technical, not oversimplified either.
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 31 Oct 2019, 15:31 
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While I don't have as much knowledge about the technical aspect of this stuff it looks great and I can clearly understand it.
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 31 Oct 2019, 16:58 
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The section on RSS is incorrect. The digital tracks on the disc contain the program code so the only listenable audio is on the analog tracks. I'm basing this on the single LDRom title I have, but I can't imagine any of the others would be different.

The very early Digital Sound players could not select Digital 1/L and 2/R independently. You won't have "4 separate audio" programs until much later. I think Criterion were the only ones to actually do this in supplemental sections.
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 31 Oct 2019, 23:03 
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Seems a lot of early titles do not indicate any surround information on the jackets though it was present in the soundtrack, how should this type be classified?
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 01 Nov 2019, 05:39 
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allenwrench wrote:
Seems a lot of early titles do not indicate any surround information on the jackets though it was present in the soundtrack, how should this type be classified?


Same for CED announced as "Stereo" but actually carrying over the surround information from the original masters.

Best way would be to ... just play the disc and turn on Prologic/Surround decoding to for sound the center/rear channels?

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 01 Nov 2019, 10:37 
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blam1 wrote:
The section on RSS is incorrect. The digital tracks on the disc contain the program code so the only listenable audio is on the analog tracks. I'm basing this on the single LDRom title I have, but I can't imagine any of the others would be different.


Would you have some more data in it?

Realizing it's not "surround" but stereo spatialisation actually.

https://segaretro.org/Roland_Sound_Space

blam1 wrote:
The very early Digital Sound players could not select Digital 1/L and 2/R independently. You won't have "4 separate audio" programs until much later. I think Criterion were the only ones to actually do this in supplemental sections.


We'll have it as an additional feature when I can find time (and internet at home, now looking at Nov 15th!) to code further the Hardware section.

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 03 Nov 2019, 11:31 
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admin wrote:
I still have a big section on AC3 and DTS to draft, and then move to Hi-Vision (A-mode, B-mode, EFM, etc.).


AC3 and DTS added!

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 03 Nov 2019, 14:21 
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Nice, about ac3, there is also Judge Dredd that has been released in France as an NTSC ac3 disc.
And a question about DTS, you say that closed caption can't be contained on a disc, but why is my street fighter copy (only dts disc I have) saying that it has closed captions ? was it a lie ? (can't verify it)
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 03 Nov 2019, 17:58 
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ryosaeba84 wrote:
And a question about DTS, you say that closed caption can't be contained on a disc, but why is my street fighter copy (only dts disc I have) saying that it has closed captions ? was it a lie ? (can't verify it)


Ahhh might have been my mistake.

CC is in the video signal... LD-G is in the audio signal.

Correct?

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 05 Nov 2019, 07:00 
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Forgot one special case of NTSC LD with Digital Audio only -> CDV and VSD (5"!)

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 06 Nov 2019, 14:41 
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The draft made it to "public release".

I let the HELP -> SOUNDTRACKS become a public link.

Hope it will be helpful!

Julien
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 06 Nov 2019, 20:28 
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Quote:
CC is in the video signal... LD-G is in the audio signal. Correct?


Yep. CC uses two lines of the video signal (the second includes the first active half-line of the picture, so you can often see it twittering away right at the top of the display). LD+G uses the R to W subchannels of the CD-style soundtrack, like CD+G does.

Quote:
MONO soundtrack can also be CX-encoded but this brings little difference to the final result. CX is designed to work on STEREO materials. The opposite is also true, if you do not have a STEREO or MONO sountrack but have different soundtracks on Left and Right stracks (for example a bilingual release), then CX encoding cannot be used.


The first bit there doesn't sound quite right. CX should work fine on mono soundtracks (i.e. where both channels are the same) or on stereo soundtracks. It won't sound very good when the two channels carry different material because the same gain adjustment is applied to both channels in the CX scheme - so volume variation on one channel would cause the background noise level on the other channel to vary.
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 Post subject: Re: Soundtracks on Laserdisc Help Section (draft)
PostPosted: 06 Nov 2019, 23:03 
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admin wrote:
blam1 wrote:
The section on RSS is incorrect. The digital tracks on the disc contain the program code so the only listenable audio is on the analog tracks. I'm basing this on the single LDRom title I have, but I can't imagine any of the others would be different.


Would you have some more data in it?

Julien


Best as I can determine, the MegaLD and LD-Rom2 formats were laid out on the disc in exactly the same way. Analog audio playback, PCM tracks for game data. The difference was which game pack was required. MegaLD required the Sega pac. and LD-Rom2 required the NEC pac.
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