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Piezoelectric sounder excited at dominant resonant frequency whilst driven at lower tonal frequency
Piezoelectric sounder excited at dominant resonant frequency whilst driven at lower tonal frequency
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机译：压电发声器以主共振频率激励，而以较低的音调频率驱动
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摘要
A sounder for an alarm having a piezo-electric element (1) and an electronic drive circuit (100) to drive the piezo-electric element to produce an audible sound perceived as a first tone at a first tonal frequency, the piezo-electric element having a dominant resonant frequency; the dominant resonant frequency is above the first tonal frequency and the electronic drive circuit is arranged to drive the piezoelectric element to produce the first tone sound; the piezo-electric element is also excited at the dominant resonant frequency while the first tone sound is produced.
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