公开(公告)号：WO1993025167A1

公开(公告)日：1993-12-23

申请号：PCT/US1992004569

申请日：1992-06-05

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  EATWELL, Graham ,  EVANS, Robert ,  HOHMAN, John ,  SCOTT, Roy

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

IPC: A61F11/02

CPC classification number: G10K11/178 ,  A61F2011/145 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3045 ,  G10K2210/506

Abstract: An active selective headset system characterized by a headset (51) having controller means (50) with an LMS adapter, feedback compensator and cancellation filter with reference microphone (54) and residual microphones (53) and speakers (52), where the controller means synthesizes an "anti-noise" to cancel the noise before reaching the ear canal. The headset which is selective, i.e., "anti-noise" signal cancels only the noise signal with minimal affect on speech and warning signal which pass to the ear canal.

Abstract translation: 一种主动选择性耳机系统，其特征在于耳机（51）具有带有LMS适配器的控制器装置（50），具有参考麦克风（54）和残余麦克风（53）和扬声器（52）的反馈补偿器和消除滤波器，其中控制器装置 合成“抗噪声”，以抵消到达耳道前的噪音。 选择性的耳机，即“抗噪声”信号仅消除噪声信号，对通过耳道的语音和警告信号的影响最小。

公开(公告)号：WO1993021876A1

公开(公告)日：1993-11-11

申请号：PCT/US1992003441

申请日：1992-04-30

Applicant: NOISE CANCELLATION TECHNOLOGIES INC. ,  CLAYBAUGH, Dave ,  DENENBERG, Jeffrey

Inventor： NOISE CANCELLATION TECHNOLOGIES INC.

IPC: A61F11/06

CPC classification number: H04R1/1083 ,  A61F2011/145 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/1082 ,  G10K2210/3045 ,  H04R5/033

Abstract: In the area of active noise cancelation headsets, the noisy environment often encountered in the link with communication systems causes lack of intelligibility on the outward communications path. Consequently another in-wire cancellation channel to enhance the intelligibility is required. This additional processing channel adds to the cost of the headset. The invention uses residual microphones (12) to reproduce the sound that remains in the ear after cancelation so that the controller (13) can make further adjustments through filter (15) and LMS adapter (14) to the anti-noise signal.

Abstract translation: 在有源噪声消除耳机的领域，与通信系统的连接中经常遇到的嘈杂环境导致向外通信路径的可懂度不足。 因此，需要另一个在线消除通道来增强可懂度。 这个额外的处理频道增加了耳机的成本。 本发明使用剩余麦克风（12）来再现在取消之后留在耳朵中的声音，使得控制器（13）可以通过滤波器（15）和LMS适配器（14）进一步调整到抗噪声信号。

公开(公告)号：WO1993021428A1

公开(公告)日：1993-10-28

申请号：PCT/US1992003025

申请日：1992-04-15

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  EGHTESADI, Ceasar

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

IPC: F01N01/06

CPC classification number: F01N1/16 ,  F01N1/065 ,  F01N1/089 ,  F01N9/00 ,  F01N2490/08 ,  Y02T10/47

Abstract: An active noise cancellation muffler for automotive and industrial use as shown in the figure comprises a muffler chamber, an internal plate with an attached pipe mounted inside the muffler chamber dividing the muffler chamber into first and second chambers, a controller system including a linear motor/actuate, a motor/actuator controller and an error microphone for moving the partition plate in both directions (+/- DELTA chi ) to change the relative sizes of the first and second chambers.

Abstract translation: 如图所示的用于汽车和工业用途的有源噪声消除消声器包括消声器室，内部板，其具有安装在消声器室内的附接管，将消声器室分成第一和第二室;控制器系统，包括线性电动机/ 启动，马达/致动器控制器和用于在两个方向（+/- DELTA chi）上移动隔板的误差麦克风，以改变第一和第二腔室的相对尺寸。

公开(公告)号：WO1993019458A1

公开(公告)日：1993-09-30

申请号：PCT/US1992002073

申请日：1992-03-19

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  SMITH, Dexter ,  SCHWARTZ, Joseph ,  ZIEGLER, Eldon, W., Jr.

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

IPC: G10K11/16

CPC classification number: H02K5/24 ,  G10K11/178 ,  G10K2210/10 ,  G10K2210/121 ,  G10K2210/123 ,  G10K2210/3013 ,  G10K2210/3045 ,  G10K2210/3212 ,  G10K2210/501 ,  H02K11/048 ,  H02K11/20 ,  H02K23/66 ,  H02P7/298

Abstract: An active attenuation system for a DC motor (11) which yields global vibration reduction of slot or other motor induced tonals at the plate on which the motor is mounted without modifying the construction of the motor. The system comprises one or more vibration sensors (13), a signal synchronized to the slot rate or other motor induced tonal rate, an electronic adaptive controller (12) and the means to inject the control signal into the motor field and/or armature current.

Abstract translation: 一种用于直流电动机（11）的主动衰减系统，其在安装电动机的板上产生槽或其他电动机引起的补偿的全局减振，而不改变电动机的结构。 该系统包括一个或多个振动传感器（13），与缝隙率或其他电机感应音调速率同步的信号，电子自适应控制器（12）以及将控制信号注入到电动机场和/或电枢电流 。

公开(公告)号：WO1993009334A1

公开(公告)日：1993-05-13

申请号：PCT/US1991007831

申请日：1991-10-30

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  LANGLEY, Andrew, J.

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

IPC: F01N01/06

CPC classification number: F16L55/0333 ,  F01N1/065

Abstract: In an actively sound dampened muffler, the improvement of a venturi effect area (22) producing means adjacent an aperture (23) in said muffler near which is mounted a loudspeaker (25) in an enclosure (24), the venturi effect area (22) preventing hot exhaust gases from impinging on the loudspeaker (25).

Abstract translation: 在积极声音衰减的消音器中，文丘里效应区域（22）的改进产生邻近所述消声器中的孔（23）的装置，在所述消音器附近将扬声器（25）安装在外壳（24）内，文丘里效应区域（22） 防止热废气撞击到扬声器（25）上。

公开(公告)号：WO1992019080A1

公开(公告)日：1992-10-29

申请号：PCT/US1991002731

申请日：1991-04-19

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC. ,  EGHTESADI, Khosrow ,  HOGE, William, John, Joseph

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC.

IPC: H04R25/00

CPC classification number: H04R1/2842 ,  H04R1/30

Abstract: The sound wave radiated from the front surface (UF) of a loudspeaker driver diaphragm is of opposite polarity with respect to that radiated from the back surface (UB). If the two signals are directly combined, they will tend to cancel one another. An acoustic phase inversion network (5) is used to ensure that the backwave is in phase with the front wave, and the combined signals are used to drive the inlet of a loudspeaker transmission line (6).

Abstract translation: 从扬声器驱动器隔膜的前表面（UF）辐射的声波相对于从背面（UB）辐射的那个极性相反。 如果两个信号直接相结合，它们将相互抵消。 使用声相反转网络（5）来确保反波与前波同相，并且组合的信号用于驱动扬声器传输线（6）的入口。

公开(公告)号：WO1991013243A1

公开(公告)日：1991-09-05

申请号：PCT/GB1991000266

申请日：1991-02-20

Applicant: NOISE CANCELLATION TECHNOLOGIES INC. ,  ROSS, Colin, Fraser ,  LANGLEY, Andrew, John ,  EATWELL, Graham, Paul

Inventor： NOISE CANCELLATION TECHNOLOGIES INC.

IPC: F02B27/00

CPC classification number: F01N1/065 ,  F02B27/001 ,  F02M35/1038 ,  F02M35/125 ,  Y02T10/146

Abstract: A control system is described for improving continuous dynamical control on the pressure in the outlet or inlet system (3) or both of a machine (1) in order to control the performance of the machine. The system comprises an actuator (4) for varying the pressure in the selected system, a sensor (8) for monitoring the operation of the machine and producing a signal indicative thereof, and control means (5) responsive to the sensor signals for driving the actuator, wherein the control means operates to adjust the machine performance according to predetermined data, to optimise the machine performance. The data may be in a memory (look-up table) or the control means may operate in accordance with an algorithm. A second sensor may be provided to generate a signal indicative of sound produced by one or other or both of the outlet and inlet systems to produce signals to enable the control means simultaneously to reduce noise generated by the machine as well as to improve the performance of the machine by active feedback.

Abstract translation: 描述了一种控制系统，用于改进对机器（1）的出口或入口系统（3）或两者的压力的连续动态控制，以便控制机器的性能。 该系统包括用于改变所选系统中的压力的​​致动器（4），用于监视机器的操作并产生指示其的信号的传感器（8），以及响应于传感器信号驱动 致动器，其中控制装置根据预定数据操作以调节机器性能，以优化机器性能。 数据可以在存储器（查找表）中，或者控制装置可以根据算法进行操作。 可以提供第二传感器以产生指示由出口和入口系统中的一个或两个或两个出口和入口系统产生的声音的信号，以产生信号，以使得控制装置能够同时减少由机器产生的噪声以及改善 该机通过主动反馈。

公开(公告)号：WO1991012579A1

公开(公告)日：1991-08-22

申请号：PCT/US1991000722

申请日：1991-02-07

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： NOISE CANCELLATION TECHNOLOGIES, INC. ,  ZIEGLER, Eldon, W., Jr.

IPC: G06F15/31

CPC classification number: H03H21/0012 ,  G10K11/178 ,  G10K2210/3011

Abstract: A digital virtual earth active cancellation system which receives a phenomena input signal representing residual phenomena to be cancelled and has an adaptive filter which generates a cancellation signal. A system impulse response is convolved with the cancellation signal and is subtracted from the input signal to produce an estimate of noise. This substantially eliminates the problems associated with destructive feedback due to phase shifts. The residual signal is used to control an adaptive filter that receives the estimated noise as an input. The adaptive filter produces the cancellation signal by filtering the estimated noise with filter weights that are adapted using the residual signal and the estimated noise convolved with the system impulse response.

公开(公告)号：EP0695452B1

公开(公告)日：2000-07-05

申请号：EP94913315.1

申请日：1994-04-01

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham, P.

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K2210/117 ,  G10K2210/3025 ,  G10K2210/3042 ,  G10K2210/3046 ,  G10K2210/3053 ,  G10K2210/3057

Abstract: A multiple-input, multiple-output adaptive control system which utilizes perturbations to the frequency components of the outputs to determine the desired changes to said coefficients. The control system is particularly suited to the active control of noise and vibration.

公开(公告)号：EP0694197B1

公开(公告)日：2000-02-23

申请号：EP94913962.0

申请日：1994-04-01

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham P., 26 East Drive ,  LANGLEY,Andrew, 28 Canons Field

IPC: G10K11/16 ,  H04R3/00 ,  H04R1/10

CPC classification number: H03G3/32 ,  G10K11/17817 ,  G10K11/17875 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/1053 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3045 ,  H04R2460/01 ,  H04S7/301 ,  H04S7/307

Abstract: An improved audio system designed to maintain a desired sound at the ear of a listener by using an equalization filter (2). The equalization filter (2) is continuously adjusted in response to the signal (9) from a sensor (8) which monitors the sound close to the listener's ear. The audio system can be combined with an active noise control system (3) to reduce interference from external noise.