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.
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