公开(公告)号：EP0643571A1

公开(公告)日：1995-03-22

申请号：EP92913616.0

申请日：1992-06-05

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham ,  EVANS, Robert ,  HOHMAN, John ,  SCOTT, Roy

IPC: A61F11 ,  G10K11

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

Abstract: 2136949 9325167 PCTABS00028 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.

公开(公告)号：EP0694234B1

公开(公告)日：2000-03-29

申请号：EP92914496.2

申请日：1992-06-25

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: H04B15/00 ,  H04B1/10 ,  H03B1/04

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3032 ,  G10K2210/3045

Abstract: A control system for controlling periodic disturbances employing a delay inverse filter (5) for supplying a signal, in response to a disturbance signal received by a sensor (1), a variable delay circuit (6) which is adjusted such that the delay through the delayed inverse filter and the variable delay is equal to a whole number of cycles of the disturbance signal. The output from said variable delay circuit being supplied to an actuator (9) such that it is combined with said disturbance signal at the sensor.

公开(公告)号：EP0660958B1

公开(公告)日：1999-06-23

申请号：EP92920842.9

申请日：1992-09-21

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: G06J1/00 ,  H03H17/02

CPC classification number: H03H17/0283

公开(公告)号：EP0694234A1

公开(公告)日：1996-01-31

申请号：EP92914496.0

申请日：1992-06-25

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: G10K11

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3032 ,  G10K2210/3045

Abstract: A control system for controlling periodic disturbances employing a delay inverse filter (5) for supplying a signal, in response to a disturbance signal received by a sensor (1), a variable delay circuit (6) which is adjusted such that the delay through the delayed inverse filter and the variable delay is equal to a whole number of cycles of the disturbance signal. The output from said variable delay circuit being supplied to an actuator (9) such that it is combined with said disturbance signal at the sensor.

公开(公告)号：EP0647372A1

公开(公告)日：1995-04-12

申请号：EP92914435.0

申请日：1992-06-25

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: G10K11 ,  H03B1 ,  H04B1

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3032 ,  G10K2210/3051 ,  G10K2210/512

Abstract: A harmonic filter for active or adaptive noise attenuation control systems for obtaining the complex amplitude of a single harmonic component from a signal which contains one or more harmonic components.

公开(公告)号：EP0647372B1

公开(公告)日：1999-05-26

申请号：EP92914435.0

申请日：1992-06-25

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: H03B1/04 ,  H04B1/10 ,  G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/121 ,  G10K2210/3028 ,  G10K2210/3032 ,  G10K2210/3051 ,  G10K2210/512

公开(公告)号：EP0660958A1

公开(公告)日：1995-07-05

申请号：EP92920842.0

申请日：1992-09-21

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EATWELL, Graham

IPC: G06J1 ,  H03H17

CPC classification number: H03H17/0283

Abstract: A filter system with low throughput delay having at least two parallel filters, either sampled-data or continuous, wherein one of the filters has a low throughput delay in comparison with the other filters.

公开(公告)号：EP0643882A1

公开(公告)日：1995-03-22

申请号：EP92913918.0

申请日：1992-06-05

Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.

Inventor： EVANS, Robert ,  CLAYBAUGH, David ,  EATWELL, Graham ,  PARRELLA, Michael

IPC: A61F11 ,  H04R5

CPC classification number: H04R1/1083 ,  A61F2011/145 ,  H04R5/033

Abstract: A passive selective headset (11) characterized in that a controller accepts speech noise and warning signals from microphones (14) and allows the user to employ an 'in-wire' controller (17) or an adaptive speech filter (16) to attenuate the noise from the signal fed to the speakers (12) adjacent the user's ear.