Echoes can reveal the shape of a room
WASHINGTON—A snap of a finger, a handful of scattered microphones and a computer algorithm are all it takes to create an accurate three-dimensional map of a room, Swiss and US researchers said Monday.
The method, described in the US journal the Proceedings of the National Academy of Sciences, measured the distance between echoes to create maps of both a university lecture room and a cathedral alcove.
With more refinement, the technique could someday lead to better ways of designing concert halls for specific acoustics, aid investigations and even help with crime-scene reconstruction, researchers said.
“Our software can build a 3D map of a simple, convex room with a precision of a few millimeters,” said lead author Ivan Dokmanic, a PhD student at Switzerland’s Ecole Polytechnique Federale de Lausanne.
The microphones did not need to be placed in precise locations in order to pick up the original sound and its echoes.
The lags between the sounds and the echoes were used by the algorithm to calculate the distance from the microphones, walls and sound source, and re-create the digital 3D shape of the room.
“Architects could use this to design rooms—for example concert halls or auditoriums—based upon the specific acoustics they would like to create,” said Dokmanic.
Forensic science could use the approach to re-create details about a room that cannot be seen, or to identify the whereabouts of a person calling from inside a room.
Some people, including the blind, can naturally detect the general shape of a room by hearing sounds within it. The same process, known as echolocation, is used by bats and dolphins to navigate in the environment.
Co-authors on the study came from Harvard University’s school of engineering.
Get Inquirer updates while on the go, add us on these apps:
Disclaimer: The comments uploaded on this site do not necessarily represent or reflect the views of management and owner of INQUIRER.net. We reserve the right to exclude comments that we deem to be inconsistent with our editorial standards.
To subscribe to the Philippine Daily Inquirer newspaper in the Philippines, call +63 2 896-6000 for Metro Manila and Metro Cebu or email your subscription request here.
Factual errors? Contact the Philippine Daily Inquirer's day desk. Believe this article violates journalistic ethics? Contact the Inquirer's Reader's Advocate. Or write The Readers' Advocate:
c/o Philippine Daily Inquirer Chino Roces Avenue corner Yague and Mascardo Streets, Makati City,Metro Manila, Philippines Or fax nos. +63 2 8974793 to 94