Hearing beyond the normal range
The Hindu
New audio technique allows hearing ultrasonic sources
It is an established fact that human beings observe what and where something is happening around them using their sense of hearing. Humans, however, have a limited range of hearing and can perceive only certain sound frequencies – generally stated to lie between 20 Hz and 20,000 Hz. A new audio technique, developed by researchers at Aalto University, Finland, will now allow people to hear ultrasonic sources that generate sounds of frequencies over 20,000 Hz. , which were published in Scientific Reports early in June, also state that the technique would also allow for perception of the direction from which the sound is coming.More Related News
Responding to the prolonged water scarcity, the residents of the area took to the streets in protest on Wednesday. The protest, which drew attention to their plight, stopped only after the intervention of the police. It was not until 1.30 p.m. that a 4000-litre tanker was finally delivered by BWSSB, providing relief to the water-starved residents.