Singing Alarms Could Save the Blind
If you cannot see, you may not be able to1 find your way out of a burning building D and that could be fatal. A company in Leeds could change all that2____1____ directional sound alarms capable of guiding you to the exit.
Sound Alert, a company____2____ the University of Leeds, is installing the alarms in a residential home for____3____ people in Sommerset and a resource centre for the blind in Cumbria.____4____ produce a wide range of frequencies that enable the brain to determine where the____5____ is coining from.
Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be____6____ by humans. It is a burst of white noise____7____ people say sounds like static on the radio she says. Its life-saving potential is great.
She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their way out of3 a large____8____ room. It____9____ them nearly four minutes to find the door____10____ a sound alarm, but only 15 seconds with one.
Withington studies how the brain____11____ sounds at the university. She says that the____12____ of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms____13____ the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to indicate whether people should go up____14____ down stairs. They were____15____ with the aid of a large grant from British Nuclear Fuels.
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directional / d?"rek??nl; da?- / adj.
exit / "eks?t / n.
install / ?n"st?:l / v.b
residential / rez?"den??l / adj.ס
static / "st?t?k / n.o
potential / p?"ten??l / n.
thermal-imagingЧ(yng)
pinpoint / "p?np??nt / v._ش_
concept / "k?nsept / n.^
emergency / ?"m??d??ns? / n.or
grant / gr??nt / n.S
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