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glue69
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Post subject: AC3 and right analog channel Posted: 29 May 2021, 14:57 |
Third post and above |
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Joined: 05 Nov 2014, 11:56 Posts: 5 Location: Spain Has thanked: 0 time Been thanked: 0 time
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Hi,
I have a CLD-HF7G laserdisc player and I recently bought an AC3-Demodulator (Yamaha APD1). The demodulator works fine and I get the AC3 sound through an AV receiver. However, I'm a bit confused on the analog and digital tracks in AC3 laserdiscs. Since i didn't find anything that talks about this in the forum, I've decided to ask here.
Whenever I play an AC3 Laserdisc, the laserdisc player offers the digital channels and only the analog left channel. If I connect the demodulator to the av receiver, I get the AC3 soundtrack whichever channel I choose in the laserdisc player (digital stereo, digital right, digital left, analog stereo and analog left). If i choose analog right, the demodulator stops and there is no sound. This seems weird to me because I thought that the channel I had to choose for listening the AC3 soundtrack was the analog right and this is precicely the only channel that doesn't work when the demodulator is on.
So then I decided to play the Strange Days AC3 laserdisc (it has an audio commentary on the left analog channel). I connected the analog left cable to the TV, and at the same time I connected the demodulator to the av/receiver. Then I chose the analog left channel in the laserdisc player. Result: I get the audio commentary through the TV and the movie AC3 soundtrack through the AV receiver.
Well everything seems to work fine, but it seems this doesn't follow the general pattern of getting AC3 soundtrack through the right analog channel. Does anybody know why this is like this?
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signofzeta
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 16:53 |
Jedi Knight |
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Joined: 14 Jan 2010, 09:44 Posts: 5992 Location: Ann Arbor Has thanked: 1295 times Been thanked: 1107 times
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The fact that AC-3 takes up the space on the disc where the Analog Right usually resides is a trivia factoid. Knowing this is true only seems to confuse people. At no point does anyone ever in the history of LD actually select it that way.
If your player is an AC-3 player and the disc is an AC-3 disc then the AC-3 port will produce RF modulated Dolby Digital at all times, impossible to switch on or off, and the Analog Right will be impossible to select because what’s on it is garbage from an analog perspective.
If you have a pre-AC-3 deck you may be able to select Analog Right and will only produce ear splitting speaker destroying garbage.
Similarly, CD players made after CDROM was developed don’t usually play raw computer code through their DAC, the signal is instead muted.
Last edited by signofzeta on 29 May 2021, 17:21, edited 2 times in total.
_________________ All about LD care, inner sleeves, shrink wrap, etc.
https://youtu.be/b3O-vHpHRpM
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signofzeta
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 17:19 |
Jedi Knight |
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Joined: 14 Jan 2010, 09:44 Posts: 5992 Location: Ann Arbor Has thanked: 1295 times Been thanked: 1107 times
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rcarlson wrote: Everything's working as expected in your setup. Just a little semantic confusion: the AC3 track resides on the right analog track, but that's not where you get it. Your player outputs AC3 whenever present over the AC3 coax output, except when you tell the player to output the right analog channel; it won't do both at once. In all other cases it outputs what you select through the player the normal way and AC3 to the demodulator at the same time. What I do is have a normal input on the AV for most LDs and another that I switch to for AC3.
Hope that clears it up! This seems to add confusion. Like the OP, on my AC-3 decks I cannot select analog Right if the disc is AC-3. There is no either/or. I’m pretty sure this true to every machine, at least every Pioneer machine with factory AC-3. I suppose a modded CLD-97 would probably let you listing to the squeal...
_________________ All about LD care, inner sleeves, shrink wrap, etc.
https://youtu.be/b3O-vHpHRpM
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takeshi666
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 17:24 |
Absolute fan |
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Joined: 01 Feb 2018, 02:41 Posts: 1996 Location: Finland Has thanked: 183 times Been thanked: 387 times
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So what you're saying is that the AC-3 signal is always output by the player, regardless of what audio track you've actually selected, except when you select analog right? Did I understand that correctly? signofzeta wrote: Similarly, CD players made after CDROM was developed don’t usually play raw computer code through their DAC, the signal is instead muted. Man, that always confused me as a kid because I would always see the warnings on CDs with data on track 1 warning me not to play it - which of course I did because I was a kid - but I could never hear a thing. That explains everything!
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admin
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 17:29 |
Site Admin |
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Joined: 07 Aug 2002, 23:37 Posts: 4551 Location: Tokyo Has thanked: 295 times Been thanked: 1147 times
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glue69 wrote: Since i didn't find anything that talks about this in the forum, I've decided to ask here. Hello, The help sections are on the main website, try: https://www.lddb.com/help/ac3rf/https://www.lddb.com/help/sound/The Player will automatically output AC3RF to the dedicated port and MUTE Analog Right on the Analog outputs (that's why you can get Analog Left with the commentary). Older/incompatible players might just output both analog sound tracks with a lot of noises on the right channel. Looks like your setup works as expected. Julien
_________________ HARDWARE DATABASE HLD-X0/9 LD-S9 OPPO 105/205 SL-1200G LDD-1 MSC-4000 R2144 PONTUS II C45 MC257
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takeshi666
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 17:45 |
Absolute fan |
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Joined: 01 Feb 2018, 02:41 Posts: 1996 Location: Finland Has thanked: 183 times Been thanked: 387 times
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admin wrote: The Player will automatically output AC3RF to the dedicated port and MUTE Analog Right on the Analog outputs (that's why you can get Analog Left with the commentary). Is this true with players with aftermarket mods as well?
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rcarlson
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Post subject: Re: AC3 and right analog channel Posted: 29 May 2021, 18:07 |
Serious fan |
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Joined: 02 Jan 2021, 00:35 Posts: 245 Location: Northern Virginia Has thanked: 164 times Been thanked: 142 times
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signofzeta wrote: This seems to add confusion. Like the OP, on my AC-3 decks I cannot select analog Right if the disc is AC-3. There is no either/or. I’m pretty sure this true to every machine, at least every Pioneer machine with factory AC-3. I suppose a modded CLD-97 would probably let you listing to the squeal... I have a CLD-79, and it behaves the way the OP describes: you can choose analog right, but if you do and it's AC3 you get nothing from either the demodulator or the RCA outputs (mute, not squeal). I went to triple-check this just now.
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