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 Post subject: Re: AC-3 RF specification?
Posted: 29 Jun 2021, 14:12 

I came into this forum to basically post this exact thread.

I was hoping to find some information on the AC3 RF signal. Like the frequency it operates on, etc.

I'm an embedded firmware developer, and I wanted to look into building my own demodulator with a few cheap parts like say an AVR (Not sure if they're fast enough -- might need to go ARM) plus some RF and SPDIF modules. The problem is I just can't seem to find the required technical documentation on the AC3 RF signal itself.

In theory, I should be able to convert the RF signal into a bitstream and send it out over SPDIF relatively easily. In theory. I'll see if theory matches up with reality if I can get my hands on specs. :lol:

If I'm able to come up with a solution, I'd be happy to share the information and even source code with others who could build their own. Hopefully with just a dirt-cheap Arduino board and a couple other bits. I could utterly fail, as RF isn't one of my areas of expertise, but I'd at least like to give it a try.

$200+ on eBay just to get AC3 surround from a Laserdisc is insane.

I'm wondering if the details are too well-kept of a secret to pull this off.

If you find anything about "software decoding" AC3-RF that would also be very helpful for ld-decode. See: https://github.com/happycube/ld-decode/issues/622

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Posted: 21 Jul 2021, 19:20 

Just wanna say thanks for the instructions. I replaced C116 on a dead DVL-919 and temporarily bridged the blown P612 and it works again. I now ordered new fuses then hopefully everything will be OK again.

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Posted: 08 Nov 2022, 22:37 

el.pablo wrote:
Does anyone have one to sell or know where I can get one? Thanks.


In the US? Not anymore. I saw one on ebay Kleinanzeigen in Germany.

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 Post subject: Fitto Karaoke Boxes
Posted: 09 Jan 2023, 11:59 

I found something interesting I couldn't find any information for.

Fitto Karaoke Boxes

I got two filled with various Hong Kong Karaoke discs (not only from Fitto). I don't know if those came pre-filled or could be bought separately. One came with a catalog / song list for Fitto LAV 8001 to 8030.

IMG_3164S.JPG

IMG_3163S.JPG

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Posted: 25 Mar 2023, 21:43 

That's not so uncommon.

Werner - Beinhart! (1990) [51397]

The first comment says, there is a second cover version. That's correct, I do have both. And this is not the only one.

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Posted: 27 Mar 2023, 20:59 

There are even worse things: Same cover, same catalog number but one version in full screen, one in widescreen. So different content here. The ONLY difference is a sticker on the later one.
Lethal Weapon (1987) [11709 LD]

Or here where there are two covers but to know if you have the "fixed" version of the disc, you have to look at the mint marks.
Eagles: Hell Freezes Over (1994) [ID4065GF]

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Posted: 06 Oct 2023, 14:54 

I had another look at the player and there are more adjustment points. I slightly increased some of the potentiometers and now have a decent image. I could also revert the three settings i previously changed to get a picture to their original state. So nothing is maxed out now.

Sound is also there now.

I don't know how good the image should look. I get some shadows on the Japanese subs but it is still a old analog medium not a Blu-Ray.

It's absolutely worth not giving up on such a well-build machine. It'll go back to storage now nevertheless. I won't keep the setup for just one disc.

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Posted: 13 Oct 2023, 07:56 

Yes

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Posted: 18 Feb 2024, 11:57 

It's a shame @laserdisc.ws doesn't want to provide any pictures or information. Such a rare piece should be shared with the community.

I was also following the various auctions on HD MAC and other rare discs but I won't spent a few hundred $ just to have such an item without a player.

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Posted: 04 Jun 2024, 12:10 

It's a nice piece of technology but my LVR-6000 & LVS-6000P has been packed away after one test. Yeah, they are working (at least the playback, haven't tried recording) but other than being curious about it once there is not much use for it unless you have some disc you desperately want to play.
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