Comic Discussion > QUESTIONABLE CONTENT

WCDT strips 4231-4235 (30th of March to 3rd April, 2020)

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notStanley:
https://en.wikipedia.org/wiki/Laser_turntable

A few of today's search hits tried to imply it was "not digital", that is just market speak.  The optical interface will not be analogue.

hedgie:
My turntable isn't contactless, unfortunately, but *does* have a USB output.  So, whenever I buy a new LP, the first thing I do is record a playthrough and encode it as flac.  Of course, I am lazy and have several acquisitions that I haven't played yet because chopping up the resulting stream into discrete tracks is annoying.

Thrudd:

--- Quote from: notStanley on 06 Apr 2020, 10:11 ---https://en.wikipedia.org/wiki/Laser_turntable

A few of today's search hits tried to imply it was "not digital", that is just market speak.  The optical interface will not be analogue.

--- End quote ---

You can blame the whole mess on today's modern patent jungle that has stymied any real developments of a commercial product outside of the rarefied atmosphere of audiophiles with more money than sense.

If I was designing such a system to day I would start by using a cellphone camera module through a short focus lens since it is pretty much off the shelf except for the lens, small and lightweight.
Physical tracking would be linear to match the mechanism they used to cut the original track for the die press so you avoid the tonearm tracking distortion you would normally get.
The software for this is a straight off the shelf industrial vision system.

As for the reading of the track data 100% digital may give you too much detail and you would have to get creative with your filtering algorithms but the reproduction would be 100% accurate.
Mind the electronics to do all this would have to be using the processing power equivalent to a modern video card and not a few hundred kilohertz used in most consumer goods.

Tova:
Which specific whole mess are you referring to in your post? There are so many to choose from.  :clairedoge:

I'd be curious to know what patents on this technology, if any, remain unexpired. The fundamental patent would have expired by now.

I suspect that the devil is in the implementation detail, as is the case with a lot of these kinds of ideas. But if it's as even half as straightforward as you say, why not go ahead and build one?

Wingy:

--- Quote from: Is it cold in here? on 05 Apr 2020, 09:14 ---Our late cat would bury her face in anything that smelled like sweaty feet.

--- End quote ---
One of our late cats was the same.  If I came in all hot and sweaty from doing outside chores, the Best. Possible. Thing. for that cat to do was come over to where I was lying on the floor and roll in my left armpit.  The wetter and nastier it was, the louder she'd purr.  My right armpit wasn't nearly as interesting; go figure.  And if I made the mistake of taking my Tshirt off, she'd groom my armpit hairs (which you can imagine what a cats tongue feels like on unprotected armpit skin). 

Truly a strange beast.  Yes, I have pictures.

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