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    • 7. 发明申请
    • IN-EAR ACTIVE NOISE REDUCTION EARPHONE
    • 耳内主动降噪耳机
    • WO2018057508A1
    • 2018-03-29
    • PCT/US2017/052255
    • 2017-09-19
    • BOSE CORPORATION
    • GAUGER, JR., Daniel M.PARTHASARATHI, AnandCHENG, LeiHICKS, Matthew R.RULE, John Allen
    • H04R1/10G10K11/178
    • An active noise reduction (ANR) earphone system includes a feedback microphone for detecting noise, feedback circuitry, responsive to the feedback microphone, for applying a digital filter K fb to an output of the feedback microphone to produce an antinoise signal, an electroacoustic driver for transducing the antinoise signal into acoustic energy, a housing supporting the feedback microphone and the driver near the entrance to the ear canal, and an ear tip for coupling the housing to the external anatomical structures of a first ear of a user and positioning the housing to provide a consistent acoustic coupling of the feedback microphone and the driver to the ear canal of the first ear. The acoustic coupling includes a tube of air defined by the combination of the housing and ear tip, having a length L and effective cross-sectional area A such that the ratio L/A is less than 0.6 m -1 .
    • 主动噪声降低(ANR)耳机系统包括用于检测噪声的反馈麦克风,响应于反馈麦克风的反馈电路,用于将数字滤波器Kfb施加到 反馈麦克风的输出以产生抗噪声信号,用于将抗噪声信号转换为声能的电声驱动器,支撑耳道入口附近的反馈麦克风和驱动器的外壳以及用于将外壳耦合到 使用者的第一耳朵的外部解剖结构以及定位所述外壳以提供所述反馈麦克风和所述驱动器到所述第一耳朵的耳道的一致声学耦合。 声耦合包括由外壳和耳塞的组合限定的空气管,其具有长度L和有效横截面积A,使得比率L / A小于0.6m -1 -1 / sup >