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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 28 Jul 2020, 00:30 
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happycube wrote:
The V2600 is really a CLD-S201 with a serial port. If you get a good deal on it and it's fixable, it's still nice :)


Yeah! It came from a high school library across the state so I'm assuming the laser has low hours. Unless it was on an A/V cart and used in classrooms. When I was in high school we had a LaserDisc player (possibly this exact model) and I was intrigued by the perfect freeze frame capabilities.

Looking at the design of the consumer model I immediately see two easily accessible belts. Hopefully the disc transport is the same and I can get to those without much trouble. The seller claims it doesn't eject and makes a noise, which is either going to be a bad belt or lubrication issue.

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Last edited by titan91 on 30 Jul 2020, 02:32, edited 1 time in total.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 30 Jul 2020, 02:29 
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My player came in today. Unfortunately the power supply board was either missing the rear screw or it fell out in shipping. This resulted in the board breaking on both ends. The front end is just a mounting point but the back end severed a jumper and a few traces in the mains AC section. Does anyone know of a spare board I can buy? If not I'll epoxy it back together and run some jumper wires.

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It also arrived with the laser sled unsecured which I think broke the plastic shield covering the focus mechanism. Luckily, the mechanism seems undamaged. I think this was done because the tray would not close. This appears to be due to the toothed bar of the sled getting stuck under the large black gear in the front as the sled rises up. This in turn seems to not line up with a small gap in the teeth, meaning the previous owner probably jumped the teeth pushing the tray in.

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I also found this part loose in the machine. If doesn't appear to be broken. Can someone tell me where it goes?

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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 30 Jul 2020, 17:15 
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Had this happen to my dreamcast psu. If you're handy with a soldering iron then it shouldnt be too difficult to repair. I would suggest scraping back the trace to copper and solder a thick piece of copper across the break. I usually strip a coax and use the copper. Epoxy the board before you solder for added strength.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 30 Jul 2020, 17:36 
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That sounds like a plan. If it get it working and some CXADC captures (can't afford a Domesday Duplicator) I'll come back to this thread with some links.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 31 Jul 2020, 00:42 
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My machine appears to be a loss (to me anyway). The power supply board has components on the other side damaged as well as the transformer. It's also not removable because Pioneer in their infinite wisdom used soldered in cables. If anyone wants it for cheap parts PM me.

Back on topic.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 05 Aug 2020, 11:47 
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I have a few DD boards left, in case someone is interested: Domesday Duplicator boards available

Thanks go to the creators of the hard- and software. Awesome project!
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 07 Aug 2020, 05:02 
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Getting there (with LimeSDR as capturing device)...

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The LD player i am using is a spare Frankenstein player that i put together from 2 broken ones. It has RF noise and crosstalk issues, so part of the "badness" of the picture is from that. I'm going to work on making an example video from some of my samples and will report back.

(capture is from this disc/set: https://www.lddb.com/laserdisc/18974/EE ... al-Edition)
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 07 Aug 2020, 07:59 
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LimeSDR LD-Decode video:

https://www.youtube.com/watch?v=9MSYT7V-wcA

There are a lot of parameters to tune on the LimeSDR, so this is just basically some trial and error type stuff.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 10 Aug 2020, 20:59 
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Interesting approach with LimeSDR. Did you modify ld-decode in any way or did you get the LimeSDR to output the same format as the DD?
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 10 Aug 2020, 22:00 
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drecksoft wrote:
Interesting approach with LimeSDR. Did you modify ld-decode in any way or did you get the LimeSDR to output the same format as the DD?


For the sake of transparency, using an SDR was based off of a suggestion/comment in this thread made several years ago, it wasn't my idea. At the time, no affordable SDR with proper specs was available. I had been watching the SDR development since then and then LimeSDR came out.

Happycube added support for float32 files with .rf extension, that is built into the main code now. One problem, is that LimeSDR outputs I&Q data, so those have to be split before using LD-Decode. Initially i was doing this in "real time", however, attempts to do this in "real" time resulted in a few dropped samples, so right now, it is a multi stage process. I have to capture the IQ data directly to a file, then run through it again to split it apart. Secondly, I am also not getting any EFM/PCM/digital audio. I am not sure why, the LimeSDR might not be sensitive enough at the low frequency where that data is encoded. If that is the case, then LimeSDR won't be a true "whole disc capture" solution. For my use, i can capture digital audio directly from the player and merge them later on.

I am now interested in the "red pitaya" family of devices, and i ordered one, it's on the way. The 125/10 is much less expensive than a LimeSDR, and the 125/14 is about the same, and neither of them need as many accessories purchased (LimeSDR required heat sinks and breakout RF cables purchased separately). The specs seem to indicate they have better frequency response than LimeSDR at the frequencies needed.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 11 Aug 2020, 20:22 
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9954tony wrote:
Secondly, I am also not getting any EFM/PCM/digital audio. I am not sure why, the LimeSDR might not be sensitive enough at the low frequency where that data is encoded.


Please can you file a bug against ld-decode for that, ideally with a few short samples from different discs? The EFM PLL is very sensitive to frequency/phase response, and its current filter was adjusted fairly empirically to equalise DDD captures - it's entirely possible that the LimeSDR's input filter shape is different enough that it'd need tweaking to match. I've got a little Python tool that lets you do this interactively...
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 12 Aug 2020, 23:33 
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atsampson wrote:
Please can you file a bug against ld-decode for that, ideally with a few short samples from different discs? The EFM PLL is very sensitive to frequency/phase response, and its current filter was adjusted fairly empirically to equalise DDD captures - it's entirely possible that the LimeSDR's input filter shape is different enough that it'd need tweaking to match. I've got a little Python tool that lets you do this interactively...


Thanks. I just want to make sure i am doing everything on my end to get a good sample before i call it a bug.
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 Post subject: Re: (WIP) Laserdisc software image decoder from raw signal
PostPosted: 14 Aug 2020, 00:49 
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You're the only person I know of to use an SDR. Can you elaborate on how you split the I and Q channels? Is it simply separating them and exporting 2 new files or do they have to be mixed? I have a decent amount of SDR experience including a HackRF.
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