File:Arduino-based wow-and-flutter meter DSP arrangement.png
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[edit]DescriptionArduino-based wow-and-flutter meter DSP arrangement.png |
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. |
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Source | Own work |
Author | Retired electrician |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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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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