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| nine | This isn't Perl 6 related at all, but maybe someone here's interested: | 20:31 | |
| When shopping for new speakers I started wondering. The usual way is to take the (electrical) audio signal, amplify it and use that to drive an electromagnet which moves the actual driver consisting of a membrane and a solid magnet. | 20:33 | ||
| The membrane and magnet are usually built as light as possible to reduce inertia. They are mounted in a rubber frame carefully optimized to have a resonance frequency outside the speaker's inteded range. | 20:34 | ||
| This is where all the high tech and research goes into but it's been essentially the same for half a century. | 20:35 | ||
| timotimo | so you're suggesting to build a speaker made of a bunchton of little speakers with each having a different resonance frequency? | ||
| nine | In short: we take an unmodified audio signal and try to minimize the accoustic side effects of the mechanics. | 20:36 | |
| I wonder, why not instead modify the signal itself, before it enters the speaker. The physical properties of the speaker are very well known. | |||
| To counter inertia, one can simply boost the signal and use a higher force to move the membrane. To counter resonance one can inject an opposite wave into the signal. | 20:37 | ||
| The signal boosting is for example used in LC displays where the crystals have kind of an inertia, too. So you use a stronger initial force to get them moving faster and then scale it down so you won't overshoot. | 20:38 | ||
| This seems so simple and obvious to me that I really wonder why no one seems to have tried this so far. There must be a catch that I'm overlooking. | 20:39 | ||
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