30 Oct '14, 2pm

Harman Cancels Out Road Noise, Without Headphones

Harman Cancels Out Road Noise, Without Headphones

Automakers used to make their rides quieter with padding, special bushings, and thicker glass. But now that fuel-efficiency standards are forcing them to jettison every unneeded gram , they are leaning toward the active alternative: electronic antinoise. Bose pioneered antinoise, first in audio headphones and more recently in cars, where its system cancels low-frequency noise from the engine by using the speakers to broadcast a wavepattern half a cycle out of phase with that noise. When the peaks of one wave meet the troughs of the other, they cancel out. The rest is silence. Now comes Harman, of Stamford, Conn., with a system that tackles road noise. The problem was that this kind of sound doesn’t come from a regularly reciprocating engine and so can’t be predicted in a straightforward way. But Harman’s engineers found a trick. “We have accelerometers mounted on points in...

Full article: http://spectrum.ieee.org/cars-that-think/transportation/s...

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