Signaling device e.g. horn, for use with technical device e.g. machine, has sensor unit to detect resonance vibration of acoustic signal generator e.g. piezoelectric plate, and modulation unit to modulate carrier wave of generator

摘要

The device has a sensor unit (5) to detect a resonance vibration of an acoustic signal generator (1) e.g. piezoelectric plate. A modulation unit modulates amplitude and frequency of a carrier wave of the generator. The modulated frequency of the carrier wave corresponds to the resonance frequency of the signal generator. The resonant and stationary phases of the signal generator are changed with the frequency of a modulation wave.