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US07773759B2 Dual microphone noise reduction for headset application 有权
双麦克风降噪耳机应用

Dual microphone noise reduction for headset application
Abstract:
Improved vocal signals are obtained in headsets and similar devices by including a microphone inside a chamber formed at least in part by the wearer's ear. This second microphone provides a reduced noise input signal. The reduced noise signal is corrected by input from another microphone, located outside the chamber. This correction can include echo cancellation, spectral shaping, frequency extension, and the like.
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