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Oktava MK-012-01 hypercardiod microphones, matched pair, calibration protocols below - two coordinate systems, each for one mic, measurements from 20Hz to 20KHz in 0° (top), 90° (center) and 180° (bottom) phases.
How can i scan this and have values read into a text file, like
Freq Vol
20 0,00
23 0,04
...
20000 -12,2
? Is there a software for this type of thing?
Note: for actual speaker calibration I'll use omnis, of course.
@jrp can't think of anything short of a python script with some simple image processing code to sample the curve every X pixels. After correcting for image distortion.
@pedro Investigating this: https://www.graphreader.com/
@jrp interesting!
@pedro In order to generate data for frequency diagrams actually this new version is needed: https://www.graphreader.com/v2
By the way, i used to live not far from the Oktava factory. @_jayrope, if you will need it, i can help you to buy their microphones from the manufacturer, including those that are no longer in production.
@ivan zlax Hey Ivan, i hope, that you are doing fine. One thing I would love to pass on to the marvellous engineers at Oktava is, that their microphone clients would benefit a lot from finding data sets/value lists of their frequency diagram on a dedicated Oktava page.
If such lists were available upon entering a serial number into a page on their website, then customers could escape a lot of the possible errors, when doing a manual scan yourself.
Here's an example, scanned from the lower one of the diagrams above:
20.2486 -3.7746
21.4504 -3.7746
22.2603 -2.7437
23.1962 -1.8845
24.1714 -0.9394
25.2915 0.0056
26.6824 0.4352
27.6899 0.5211
29.3333 0.5211
30.4409 0.3493
34.872 0.1775
38.179 0.0915
42.8452 -2.1423
46.3323 -2.2282
48.2802 -1.6268
51.995 -1.2831
56.4588 -1.5408
61.5588 -1.7127
62.5812 -1.4549
65.4813 -1.5408
67.3965 -0.7676
76.2592 -0.5958
87.0009 -0.5099
103.4287 -0.0803
118.4845 0.3493
127.6011 0.7789
139.7016 0.9507
148.6034 -0.5958
155.4899 -0.7676
160.6979 -0.6817
170.9377 1.0366
178.1241 1.638
190.2561 1.8099
195.8205 2.0676
210.8877 1.8099
234.7211 1.8958
253.8245 2.2394
284.8469 2.0676
296.8223 1.9817
314.4384 2.4113
330.3676 3.1845
355.7873 3.2704
404.235 3.0986
419.4985 3.3563
457.3923 3.3563
509.0845 3.1845
571.3047 3.2704
612.7344 2.4113
641.1295 2.3254
716.5314 2.4113
768.4926 2.3254
820.8346 2.4113
906.1073 2.4972
1008.5109 2.5831
1131.771 2.3254
1203.8879 2.4113
1280.6001 2.2394
1534.9967 2.3254
1579.8903 2.5831
1632.8073 2.7549
1809.8701 2.669
1989.6783 3.0986
2242.0708 3.2704
2298.1603 2.4972
2355.6529 2.3254
2404.6606 3.0986
2526.4795 4.2155
3398.5031 4.3873
3555.9951 3.0986
3720.7856 2.4113
4496.8207 2.2394
4783.3598 2.4972
5046.4216 3.0127
5236.9692 3.7859
5390.1333 4.3014
5593.6591 4.8169
5974.6432 6.4493
6225.8257 6.707
6788.2125 6.4493
7462.6125 5.762
7776.3514 4.6451
8136.7198 2.9268
9056.2901 2.669
9593.77 1.7239
10331.9496 1.5521
11405.2876 0.5211
12384.4354 0.4352
13392.3776 -0.4239
15153.4891 -0.5958
17146.1887 -4.7197
19005.5333 -8.3282
@_jayrope the russian-language site provides diagrams in graphical form for the exact models: #^https://oktavamicrophones.ru/mk-012
And there's a link to the techspec there too.
If you need the data exactly in text form, as you wrote above - i think it is better to make an email enquiry: [email protected] (it's an "export" mailbox, so you can write to it in english)