FRANKFURT, Germany — Exhaust system suppliers have been experimenting with "active" noise-cancellation technology to suppress and modify exhaust noise for more than a decade, but Siemens VDO Automotive is taking a different tack: it’s applying the technology to air intake systems. At the 59th Frankfurt Motor Show here, Siemens touts an active noise control (ANC) system that uses a loudspeaker installed in the air intake system to generate sound waves that are the same amplitude but in the ...

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