File:Arduino-based wow-and-flutter meter DSP arrangement.png
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Arduino-based wow-and-flutter meter DSP arrangement
Summary
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| Description |
English: Arduino-based wow-and-flutter meter DSP arrangement approximating the specification of DIN 45507 / GOST 11948-78. Low end of frequency response (under 20 Hz) is ok, but the high end (20 Hz to 300 Hz) is a very crude approximation. Clock speed and resolution of the 16-bit timer do not allow quality reproduction of the standard curve. Filter constants and gain in the narrow-band channel tweaked by hand in a spreadsheet to match DIN45507 (passband 1.2 to 12 Hz, center at 4 Hz). Update: added a "Japanese" WRMS display channel (rightmost column). Typically, WRMS values are 2-3 times lower than DIN 45507 narrow-band - so no wonder the Japanese loved them. Русский: Детонометр на базе ардуино - аппроксимация типовых характеристик по DIN 45507 / ГОСТ 11948-78. Фильтры узкополосного канала настроены на центральную частоту горба 4 Гц, ширина пропускания по уровню -3 дБ 1.2-12 Гц. Вычислительной мошности более чем достаточно, главное ограничение - малая тактовая частота и малое разрешение единственного 16-битного таймера. Поэтому АЧХ фильтров выше 20 Гц получается "уж как вышло". Добавил колонку с "японскими" среднеквадратичными значениями, исчисляемыми над узкополосным каналом по DIN 45507. "Японская цифирь" при прочих равных в 2-3 раза меньше, чем показания узкополосного канала DIN 45507 - потому-то японцы её так и уважали. |
| Date | |
| Source | Own work |
| Author | Retired electrician |
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Licensing
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I, the copyright holder of this work, hereby publish it under the following license:
 
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
| The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:57, 4 June 2023 | | 2,205 × 2,493 (122 KB) | Retired electrician (talk | contribs) | upd |
| 12:27, 3 June 2023 |  | 1,905 × 2,329 (103 KB) | Retired electrician (talk | contribs) | upd | |
| 11:07, 3 June 2023 |  | 1,905 × 2,329 (107 KB) | Retired electrician (talk | contribs) | UPD | |
| 11:05, 3 June 2023 |  | 1,969 × 2,329 (107 KB) | Retired electrician (talk | contribs) | UPD | |
| 15:27, 2 June 2023 |  | 1,589 × 2,187 (86 KB) | Retired electrician (talk | contribs) | constants tweak | |
| 22:15, 1 June 2023 |  | 1,589 × 2,187 (86 KB) | Retired electrician (talk | contribs) | err fix | |
| 17:03, 1 June 2023 |  | 1,589 × 2,187 (91 KB) | Retired electrician (talk | contribs) | ||
| 15:15, 1 June 2023 |  | 4,889 × 6,633 (420 KB) | Retired electrician (talk | contribs) | Uploaded own work with UploadWizard |
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