Device for destructing dipterous insect e.g. mosquito, by diffusing ultrasonic signal, has oscillator designed to generate signal at fixed ultrasonic frequency, and modulation unit to modulate frequency of signal by control signal

摘要

The device (D) has a voltage control oscillator (OP) designed to generate an ultrasonic signal (S) at a fixed ultrasonic frequency i.e. carrier frequency. A modulation unit (MOD) modulates the ultrasonic frequency of the signal by a control signal (CO). The voltage control oscillator is mounted in an unstable manner such that the carrier frequency depends on a charging duration of a capacitor (C). The modulation unit is designed to modify the charging duration of the capacitor based on the temporal evolution of the control signal.