On this occasion, he sang the world premiere of a new song, " I'm your sound shadow ".
2.
But Wright's system is the first that can block out a particular source of noise to produce a personal " sound shadow " in which everything but the unwanted noise will still be audible.
3.
However, if the object has a diameter greater than the acoustic wavelength, a'sound shadow'is cast behind the object where the sound is inaudible . ( Note : some sound may be propagated through the object depending on material ).
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