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    QUIET FAN INCORPORATING ACTIVE NOISE CONTROL (ANC)
    3.
    发明申请
    QUIET FAN INCORPORATING ACTIVE NOISE CONTROL (ANC) 有权
    有声噪声控制（ANC）的QUIET风扇

    公开(公告)号：US20100028134A1

    公开(公告)日：2010-02-04

    申请号：US12449068

    申请日：2008-01-20

    申请人： Alon Slapak ,  Tzvika Fridman ,  Ofira Rubin

    发明人： Alon Slapak ,  Tzvika Fridman ,  Ofira Rubin

    IPC分类号： F04D29/66 ,  B23P11/00 ,  G10K11/16

    CPC分类号： G10K11/178 ,  F24F13/24 ,  F24F2013/247 ,  G06F1/20 ,  G10K2210/104 ,  G10K2210/109 ,  G10K2210/509 ,  Y10T29/49236

    摘要： An active noise control (ANC) system may be implemented to both sides of a fan, such that both directions of the noise emitting are treated to reduce the overall noise. The impact on airflow is minimal, and the technique is very effective in a broad range of low frequencies. Passive sound-absorbing materials may be included for attenuation of high frequencies. The resulting quiet fan produces a low level of noise compared to any other device based on fan, which produces the same capacity of airflow. The quiet fan may be incorporated in any mechanical system which requires airflow induction such as: computers, air conditioners, machines, and more.

    摘要翻译： 可以将主动噪声控制（ANC）系统实现到风扇的两侧，以便处理噪声发射的两个方向以降低整体噪声。 对气流的影响是最小的，该技术在广泛的低频范围内非常有效。 可以包括被动吸声材料用于衰减高频。 与基于风扇的任何其他设备相比，产生的静音风扇产生低水平的噪声，这产生相同的气流容量。 安静的风扇可以并入任何需要气流感应的机械系统，例如：计算机，空调，机器等。

    METHOD AND APPARATUS FOR ATTENUATING FAN NOISE THROUGH TURBULENCE MITIGATION
    4.
    发明申请
    METHOD AND APPARATUS FOR ATTENUATING FAN NOISE THROUGH TURBULENCE MITIGATION 有权
    通过湍流减轻来衰减风扇噪声的方法和装置

    公开(公告)号：US20090180635A1

    公开(公告)日：2009-07-16

    申请号：US11972043

    申请日：2008-01-10

    申请人： Kenneth C. Gross ,  Aleksey M. Urmanov ,  Charles E. Kinney

    发明人： Kenneth C. Gross ,  Aleksey M. Urmanov ,  Charles E. Kinney

    IPC分类号： G10K11/178 ,  H05K7/20

    CPC分类号： G10K11/178 ,  G06F1/206 ,  G10K2210/109 ,  G10K2210/11

    摘要： Some embodiments of the present invention provide a system that attenuates noise from a fan exhaust of a computer system. During operation, the system monitors the noise from the fan exhaust and calculates a frequency spectrum of the noise from the monitored noise. Next, the system generates an antiphase spectrum from the frequency spectrum and generates a flow of air which exhibits a property of the antiphase spectrum. Finally, the system directs the flow of air into the fan exhaust so that the noise is attenuated by a reduction of turbulence in the fan exhaust by the flow of air.

    摘要翻译： 本发明的一些实施例提供一种衰减来自计算机系统的风扇排气的噪声的系统。 在运行过程中，系统监视风扇排气噪声，并根据监测到的噪声计算噪声的频谱。 接下来，系统从频谱产生反相光谱，并产生具有反相光谱性质的空气流。 最后，系统将空气流引导到风扇排气中，以便通过空气流动减少风扇排气中的湍流，使噪音减弱。

    Active noise cancelling apparatus
    6.
    发明授权
    Active noise cancelling apparatus 失效
    有源噪声消除装置

    公开(公告)号：US5499301A

    公开(公告)日：1996-03-12

    申请号：US323730

    申请日：1994-10-20

    申请人： Yuko Sudo ,  Susumu Saruta ,  Yasuyuki Sekiguchi

    发明人： Yuko Sudo ,  Susumu Saruta ,  Yasuyuki Sekiguchi

    IPC分类号： F01N1/06 ,  G10K11/16 ,  G10K11/178 ,  H03H21/00

    CPC分类号： G10K11/1784 ,  G10K2210/104 ,  G10K2210/1054 ,  G10K2210/109 ,  G10K2210/121 ,  G10K2210/3032 ,  G10K2210/3045

    摘要： An active noise cancelling apparatus for actively controlling noise generated by a compressor, where noise is apt to externally leak from an opening portion of a machine chamber storing the compressor driven by an A.C. power supply. The active noise cancelling apparatus includes: a microphone, provided in the vicinity of the opening portion, for detecting noise generated by the compressor; fundamental wave component extracting portion for extracting a fundamental wave component of rotation frequency of the compressor, from a sound signal of the noise detected by the microphone; periodic signal generating circuit for a periodic signal correlative to the fundamental wave component extracted by the fundamental wave component extracting portion; periodic signal outputting circuit for outputting a predetermined periodic signal by means of comparing a phase of the periodic signal generated by the periodic signal generating circuit with a phase of the fundamental wave component; uncancelled sound extracting portion for extracting noise having been not cancelled, excluding the fundamental wave component; sound source waveform generating circuit for forming a harmonics component from the signal outputted by the fundamental wave component extracting circuit; control signal generating circuit for correcting a control signal outputted from the sound source waveform generating circuit, based on a signal from the uncancelled sound extracting portion and for generating the corrected signal in a feedback manner; and a loudspeaker for outputting the control signal generated from the control signal correcting circuit.

    摘要翻译： 一种主动噪声消除装置，用于主动地控制由压缩机产生的噪声，其中噪声易于从存储由交流电源驱动的压缩机的机器室的开口部分泄漏。 有源噪声消除装置包括：麦克风，设置在开口部分附近，用于检测压缩机产生的噪声; 基波分量提取部分，用于从由麦克风检测到的噪声的声音信号中提取压缩机的旋转频率的基波分量; 周期信号发生电路，用于与由基波分量提取部分提取的基波分量相关的周期信号; 周期信号输出电路，用于通过将周期信号发生电路产生的周期信号的相位与基波分量的相位进行比较来输出预定的周期信号; 不包括基波分量的用于提取未被消除的噪声的未通知声音提取部分; 声源波形发生电路，用于根据由基波分量提取电路输出的信号形成谐波分量; 控制信号发生电路，用于根据来自未经声音提取部分的信号校正从声源波形发生电路输出的控制信号，并以反馈方式产生校正信号; 以及用于输出从控制信号校正电路产生的控制信号的扬声器。

    Active fan blade noise cancellation system
    7.
    发明授权
    Active fan blade noise cancellation system 失效
    主动风扇叶片噪声消除系统

    公开(公告)号：US5448645A

    公开(公告)日：1995-09-05

    申请号：US203339

    申请日：1994-02-28

    申请人： Joseph R. Guerci

    发明人： Joseph R. Guerci

    IPC分类号： G10K11/178 ,  G10K11/16

    CPC分类号： G10K11/1788 ,  G10K2210/104 ,  G10K2210/109 ,  G10K2210/111 ,  G10K2210/112 ,  G10K2210/119 ,  G10K2210/3216

    摘要： An active noise cancellation device and method for reducing fan blade noise over a broad spatial area. The device comprises a microphone, a band pass filter, and audio amplifier, and a speaker array. The microphone captures the sound produced by the fan and converts it into an electrical signal. This electrical signal is input to the band pass filter which has a center frequency equal to product of fan speed and the number of fan blades which comprise the fan. The band pass filter attenuates any signals other than the primary harmonic sound produced by the rotating fan blades. The filtered signal from the band pass filter is input to the audio amplifier. The audio amplifier conditions the signal for input to the speaker array. Accordingly, each speaker in the array receives and outputs an audio signal of equal amplitude and phase as that produced by the rotating fan blades. The speaker array is mounted on or close to the fan hub in a symmetric pattern commensurate with the fan blade geometry. In general, the number of speakers which comprise the array corresponds to the number of fan blades. The position of the speaker array is adjusted until a maximum destructive interference occurs between the sound produced by the rotating fan blades and the speaker array. With the addition of a phase shifter, the active noise cancellation device can be utilized to provide noise cancellation for variable speed fans.

    摘要翻译： 一种用于在宽广空间区域上降低风扇叶片噪声的主动噪声消除装置和方法。 该装置包括麦克风，带通滤波器和音频放大器以及扬声器阵列。 麦克风捕获由风扇产生的声音，并将其转换为电信号。 该电信号输入到带通滤波器，该带通滤波器的中心频率等于风扇速度的乘积和包括风扇的风扇叶片的数量。 带通滤波器衰减由旋转风扇叶片产生的一次谐波声音以外的任何信号。 来自带通滤波器的经滤波的信号被输入到音频放大器。 音频放大器调节信号以输入到扬声器阵列。 因此，阵列中的每个扬声器接收并输出与旋转的风扇叶片产生的音频信号相等的幅度和相位的音频信号。 扬声器阵列以与风扇叶片几何形状相称的对称图案安装在风扇集线器上或其附近。 通常，构成阵列的扬声器的数量对应于风扇叶片的数量。 调节扬声器阵列的位置，直到由旋转的风扇叶片和扬声器阵列产生的声音之间发生最大的相消干涉。 通过添加移相器，可以利用主动噪声消除装置为变速风扇提供噪声消除。

    Active noise control apparatus
    8.
    发明授权
    Active noise control apparatus 失效
    主动噪声控制装置

    公开(公告)号：US5377275A

    公开(公告)日：1994-12-27

    申请号：US99005

    申请日：1993-07-29

    申请人： Seiichirou Suzuki

    发明人： Seiichirou Suzuki

    IPC分类号： F01N1/06 ,  G10K11/178 ,  H03B29/00 ,  A61F11/06

    CPC分类号： F01N1/065 ,  G10K11/1784 ,  H03B29/00 ,  G10K2210/1082 ,  G10K2210/109 ,  G10K2210/112 ,  G10K2210/3045 ,  G10K2210/503

    摘要： An active noise control apparatus comprises a secondary sound source for generating sound canceling noise emitted from a noise source, first and second microphones sequentially arranged between the noise source and the secondary sound source at a predetermined distance in a direction from the noise source to the secondary sound source, a coefficient multiplier for multiplying an output signal of the second microphone by a coefficient corresponding to a ratio of a transfer function of the first microphone with respect to the secondary sound source to that of the second microphone with respect thereto, a subtracter for obtaining a difference between a multiplication resultant signal and an output signal of the first microphone, and a signal processor for outputting a secondary sound signal obtained by multiplying the difference signal with a predetermined coefficient to the secondary sound source.

    摘要翻译： 一种主动噪声控制装置，包括：用于产生从噪声源发出的声音消除噪声的次级声源;在从噪声源到次级的方向上以预定距离顺序排列在噪声源和次声源之间的第一和第二麦克风 声源，用于将第二麦克风的输出信号乘以对应于第一麦克风相对于次声源的传递函数与第二麦克风相对于第二麦克风的传递函数的比率的系数的系数乘法器， 获得乘积结果信号和第一麦克风的输出信号之间的差异;以及信号处理器，用于输出通过将该差分信号与预定系数相乘而获得的辅助声音信号到辅助声源。