Jisho

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Noun
1. (cavity) resonatorElectronics
Wikipedia definition
2. ResonatorA resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others. The oscillations in a resonator can be either electromagnetic or mechanical. Resonators are used to either generate waves of specific frequencies or to select specific frequencies from a signal. Musical instruments use acoustic resonators that produce sound waves of specific tones.
Read “Resonator” on English Wikipedia
Read “共振器” on Japanese Wikipedia
Read “Resonator” on DBpedia

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