Siemens Automotive has reportedly developed the first electronic system for controlling automobile air induction system noise. Mounted to an intake manifold, the system consists of a microphone, chip module, and speaker that analyses noise and sends opposing frequencies through the speaker to cancel noise. The technique has been in use in military aircraft cockpits for some time but automobile manufacturers have relied on much larger plastic resonators, which also create canceling frequencies. According to Siemens, the electronic system offers performance, cost and size advantages. It even provides the ability to tune the sound of an engine according to customer preferences.
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