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    • 5. 发明授权
    • Active noise controller and controlling method
    • 主动噪声控制器及控制方法
    • US06768800B2
    • 2004-07-27
    • US09941685
    • 2001-08-30
    • Akihiko EnamitoHajime KudoYoshiyuki Sato
    • Akihiko EnamitoHajime KudoYoshiyuki Sato
    • A61F1106
    • G10K11/178G10K2210/1054G10K2210/112G10K2210/121
    • An active noise controller includes a duct (2) of a stainless steel having the shape of a pipe and provided with an opening (1) at a first end thereof, and a loudspeaker (3)connected to a second end of the duct (2). The duct (2) is disposed with its opening (1) located at a distance not greater than half the wavelength of a sound produced by a sound source (4) from the sound source (4) so as to face the sound source (4). A sound produced by the vibration of the vibrating member (5) of the loudspeaker (3) travels from the second end of the duct (2) through the duct (2) to the first end of the same, and the sound is radiated toward the sound source (4). The sound radiated through the opening (1) has a frequency substantially equal to that of an unnecessary sound included in the sound produced by the sound source (4), an amplitude substantially equal to that of the unnecessary sound and a phase substantially opposite to that of the unnecessary sound. The acoustic power of the unnecessary sound can be reduced by the sound produced by the loudspeaker (3), propagated through the duct (2) and radiated toward the sound source (4). The active noise controller is capable of achieving three-dimensional sound suppression with out being affected by heat and vibrations.
    • 主动噪声控制器包括具有管形并且在其第一端设有开口(1)的不锈钢管道(2)和连接到管道(2)的第二端的扬声器(3) )。 管道(2)设置成其开口(1)位于声源(4)从声源(4)产生的声音的波长的一半以上,以便面对声源(4) )。 由扬声器(3)的振动部件(5)的振动产生的声音从导管(2)的第二端通过导管(2)行进到其第一端,声音向着 声源(4)。 通过开口(1)辐射的声音的频率基本上等于由声源(4)产生的声音中包含的不必要的声音的频率,其幅度基本上等于不需要的声音的幅度, 的不必要的声音。 可以通过由扬声器(3)产生的声音,通过导管(2)传播并向声源(4)辐射而减少不必要声音的声功率。 主动噪声控制器能够受到受热和振动影响的三维声音抑制。