feat: add documentation for how to determine disc geometry yourself#29
feat: add documentation for how to determine disc geometry yourself#29make-42 wants to merge 10 commits intoarduinocelentano:mainfrom
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| 3. You could use any software you like to burn it. For example: | ||
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| `cdrecord -audio dev=<recorder_device> <generated_track>` | ||
| `cdrecord -sao -audio dev=<recorder_device> <generated_track>` |
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It would be helpful to explain why we use sao
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I have no idea what the different modes do. It's the one that worked for me and the one that @arduinocelentano used. If anyone has an idea. I'd love to see it explained as well!
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Has anyone actually compared tao to sao, now that parameters have been established???
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I should be able to test in a bit. Will keep you posted
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Do you think we could find disks that are recent and available to all of us so we can all calibrate and have fun? The disks shown above are not easy for me to get for a reasonable price (e.g. the "colour" versions appear to be offered in France and are hard to get in the US w/o paying a lot of shipping.
i.e., popular recent easily available world-wide disks???
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Sure, do you have any recommendations?
I will look, for sure, and guess on some recommendations. Thanks!
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I'm looking. Trying to find some new Verbatim disks where we can at least be assured we get the same SKU. Google often matches on an sku, but then I can't find it in the listing (so where did Google get it from???).
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What about Verbatim SKU 95155? As a random choice? Easy to get? Your thoughts?
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i can't find them easily in France, however the 43480 that are really similar can be acquired here
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Just ordered from Amazon. Think they are coming from England, which means it will take a while. ;-)
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| #### Step 2: Coming up with a refined guess | ||
| Open [this Desmos graph](https://www.desmos.com/calculator/vqbhbt7bkj). You can take a picture of your CD's surface and load it into Desmos and move it around till the concentric lines line up with the purple lines. You don't have to but it makes lining up the simulated lines easier. |
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I'm not suggesting this needs to be done immediately, but in the future, these equations should be written out and stored to a file or written in a tool like GeoGebra. This way, even if the link expires, the equations won't be lost.
Did you ever nail down the parameters on the Verbatim CD-R? It would be nice to offer people the CD-R option also. |
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I ran out of CD-Rs before being able to finish... |
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I could probably buy some more if need be |
I have a bunch. I can help.... maybe no need for you to buy them. |
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Okay! Iirc you have a preliminary guess that yields visible lines? |
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Umm.... some time ago I used some parameter settings you posted, and did indeed see a visible line. I think I even posted it? It was hard to see but I finally did. I'll have to go back through our postings. ;-) |
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I'll check yes |
… documentation for the different calibration methods as well as new presets
feat: clean up files
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I wrote my own software to do the png - > cdda conversion and have built a bunch of calibration modes into my code. I plan on releasing it in ~2 months. In the mean time I calibrated a Verbatim CDR: tr0=23349.76, dtr=1.389989 I actually had a few different styles of Verbatim CDRs, including some that were ~5 years old, laying around (like the "digital vinyl" ones that look like a record on the back) and they all have the same spiral parameters. |
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Awesome! Looking forward to seeing your code. Can you provide more info on the Verbatim discs you are using? The rest of us didn't find the same spiral parameters.... Super interested in seeing your calibration techniques. @make-42 has a great technique. Mine is less sophisticated but does pretty well. |
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Discussion and example of usage of the tool is here:
#23
Three new presets have been derived with this tool: