Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound repeller." ...

Since my last article four years ago on the topic of frequency shifting, technology has progressed. Modern hearing aids can capture sounds at their original frequencies and quickly rebroadcast them at ...

FAIRFIELD -- A high-pitched problem for Fairfield neighbors has young people annoyed and parents confused. It's the result of an audio repellent known as The Mosquito, a device that utilizes ...