公开(公告)号：EP0698298B1

公开(公告)日：2000-02-02

申请号：EP94914908.2

申请日：1994-05-04

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： HILDEBRAND, Stephen

IPC: H01L41/08 ,  H01L41/09

CPC classification number: H01L41/0973 ,  H01L41/098

Abstract: A low voltage bender piezo-actuator with multiple, same size piezo layers (11, 12) separated by thin electrically conductive strips (14) and adapted to be affixed to a rigid, vibration transmitting plate (10) to produce noise counter vibrations to prevent noise from passing through the plate.

公开(公告)号：EP0615648B1

公开(公告)日：1999-04-21

申请号：EP92905531.7

申请日：1991-12-02

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： MC LOUGHLIN, Michael, P. ,  EGHTESADI, Khoscrow ,  SMITH, Dexter ,  ZIEGLER, Eldon, W., Jr.

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K2210/1054 ,  G10K2210/106 ,  G10K2210/3216

Abstract: An active noise (''NOISE SOURCE'') control system for an enclosure having at least two transducers (''SECOND SOURCES'') and multiple channels in which there is interaction between the channels provides for attenuation of the desired regions within the enclosure.

公开(公告)号：EP0809842A1

公开(公告)日：1997-12-03

申请号：EP96905267.0

申请日：1996-01-29

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham, P. ,  DAVIS, Kenneth, P.

IPC: G10L15 ,  G10L11 ,  G10L19 ,  G10L21 ,  H03H17 ,  H03H21

CPC classification number: G10L25/78 ,  G10L21/0208 ,  H03H21/0012 ,  H04R2225/43

Abstract: This invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal containing both an information signal, such as speech and noise. The improvements relate to a noise power estimator (3) and a computationally efficient gain calculation method. The adaptive spectral estimator is particularly suited to implementation using digital signal processing and can be used to provide improved spectral estimates of the information signal. It can be combined with a speech or voice recognition system. A further object of the invention is to provide an accurate method for voice detection.

公开(公告)号：EP0801785A1

公开(公告)日：1997-10-22

申请号：EP95921608.0

申请日：1995-05-02

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EVANS, Robert, D. ,  ROEDER, John ,  BURKE, Michael, J. ,  TYE, George, W. ,  HOGE, William, J.

IPC: H04R1 ,  G10K11 ,  H04R3 ,  H04R5

CPC classification number: H04R3/00 ,  G10K11/178 ,  G10K2210/108 ,  G10K2210/1081 ,  G10K2210/3028 ,  G10K2210/3214 ,  G10K2210/3228 ,  G10K2210/509 ,  H04R1/1008 ,  H04R1/1033 ,  H04R1/1083 ,  H04R5/033 ,  H04R5/0335 ,  H04R2201/107

Abstract: This invention relates to the various features of a headset design that utilizes active noise cancellation. This particular design has been developed to work with radio communication systems, but many features are applicable to headsets designed solely for ear protection. The unique design features of the invention allow for uninterrupted communication capability with active noise cancellation. The design also provides it own built in rechargeable power supply that is easily removed for recharging.

公开(公告)号：EP0746290A1

公开(公告)日：1996-12-11

申请号：EP94907407.0

申请日：1994-02-08

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham, P.

IPC: G05B13 ,  G05B23 ,  G10K11 ,  H03H17 ,  H03H21

CPC classification number: G05B17/02 ,  G10K11/178 ,  G10K2210/3018 ,  G10K2210/30232 ,  G10K2210/3025 ,  G10K2210/3033 ,  G10K2210/30351 ,  G10K2210/3045 ,  G10K2210/3057 ,  H03H21/0012

Abstract: This invention relates to an improved method of on-line system identification for use with active control systems which requires less computation and reduces the problem of coefficient jitter in the filters of the active control system by using a fixed test signal which is designed to have a particular power spectrum.

公开(公告)号：EP0742941A1

公开(公告)日：1996-11-20

申请号：EP95908685.0

申请日：1995-01-26

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham, P. ,  YAN, Yong, J.

IPC: H03H11 ,  H03H17

CPC classification number: H03H11/1291 ,  H03H17/0251

Abstract: A method for designing a frequency periodic filter with a frequency response which has a periodic bandwidth including designing a first sampled data filter whose response corresponds to a set period and replacing each unit sampling delay (46) by a second data filter.

公开(公告)号：EP0713378A1

公开(公告)日：1996-05-29

申请号：EP94922156.0

申请日：1994-07-25

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： FULLER, Christopher, R. ,  ROGERS, Craig, A. ,  LIANG, Chen

IPC: E04B1 ,  B06B1 ,  F16F15 ,  G10K11 ,  H04R17

CPC classification number: F16F15/005 ,  B06B1/0688 ,  G10K11/178 ,  G10K2210/102 ,  G10K2210/118 ,  G10K2210/129 ,  G10K2210/1291 ,  G10K2210/32291 ,  G10K2210/509 ,  H04R17/00 ,  H04R17/08

Abstract: An active foam system for noise and vibration control which employs embedded PVDF layers (12) in a urethane foam pad (13). The system can be used to isolate and/or attenuate vibration. It can also be used to cause a reduction in far-field acoustic pressure and to act as a structurally radiated speaker (130).

公开(公告)号：EP0704116A1

公开(公告)日：1996-04-03

申请号：EP94916804.0

申请日：1994-05-24

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： BURKE, Michael, J. ,  TYE, George, W.

IPC: F01N1 ,  F04B39 ,  F16L55

CPC classification number: F16L55/0333

Abstract: An active flow modulator for use in a duct (12) carrying a flow (13) comprising a flapper (10) joined to said duct but subject to movement caused by the energization of a piezo element (23, 24) affixed thereto.

公开(公告)号：EP0470153B1

公开(公告)日：1996-02-28

申请号：EP90907216.7

申请日：1990-04-20

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham, Paul ,  DORLING, Christopher, Mark ,  HODSON, William, Richard

IPC: G10K11/16

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3024 ,  G10K2210/3025 ,  G10K2210/3032 ,  G10K2210/3042 ,  G10K2210/3046 ,  G10K2210/3051

Abstract: An active sound or vibration control system for compensating noise or vibration arising from a periodic source of changing periodicity, wherein sensors (6) sense the existing noise and vibration, the sensor signals are sampled several times per cycle by an ADC (8) triggered by a signal output from a sensor (3) detecting the position of the source in its cycle, the sampled signals are transformed into compensation actuator drive signal values by a series of transform and adaptation modules (11 to 13, 15) based on algorithms dependent on the frequency of the source, and the drive signal values are stored in a memory means (1) continually updated by the values derived from the sampled sensor signals.

公开(公告)号：EP0657058A1

公开(公告)日：1995-06-14

申请号：EP92920018.0

申请日：1992-09-15

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham 26 East Drive ,  GOSSMAN, William

IPC: G10K11

CPC classification number: G10K11/178 ,  G10K2210/118 ,  G10K2210/12 ,  G10K2210/125 ,  G10K2210/129 ,  G10K2210/1291 ,  G10K2210/3212 ,  G10K2210/3216 ,  G10K2210/3217

Abstract: An active high transmission loss panel for quieting either one or two way sound radiation which incorporates a number of cells (11) which contain sensors and actuators (12) adapted to be controlled independently or interactively so as to attenuate noise attempting to pass through said panel.