When [Electron Impressions] used a powerful ultrasonic array to project a narrow beam of sound toward a target, he described ...

Just as the keening sound of a car alarm aims to keep burglars away from a vehicle, the manufacturers of ultrasonic pest-control devices aim to use sound to keep birds, rodents and other pests out of ...

Kolkata: The city airport will now deploy sonic and ultrasonic sound waves to scare off birds in a bid to prevent aircraft bird strikes. In the past, the airport employed bird chasers and also burst ...