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公开(公告)号：WO1990002380A1
公开(公告)日：1990-03-08
申请号：PCT/US1989003907
申请日：1989-08-30
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
IPC: G06F15/31
CPC classification number: H03H21/0012 , G10K11/178 , G10K2210/3044 , G10K2210/3051 , G10K2210/3053 , G10K2210/3222 , G10K2210/503 , G10K2210/511
Abstract: A cancellation system including a processor having single adaptive filters adapting its filtering characteristic as a function of a phenomena signal and phenomena timing signal and a phase circuit to maintain the adapting of the filtering characteristics within 90 degrees phase of the phenomena signal. The phase circuit has the capability to measure the delays of the processor and the environment.
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公开(公告)号：WO1989011841A1
公开(公告)日：1989-12-14
申请号：PCT/US1989002487
申请日：1989-06-07
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
IPC: A61F11/02
CPC classification number: B60R11/0217 , A61F2011/145 , B60N2/879 , B60R2011/0017 , G10K11/178 , G10K2210/106 , G10K2210/1282 , G10K2210/3221
Abstract: A sound cancellation system wherein a pair of sensors and actuators are positioned immediately adjacent an associated ear of an inhabitant of an enclosure so as to provide a cancellation zone immediately adjacent an associated ear without interfering with adjacent zones. A controller receives a synchronization signal so as to cancel a selected noise associated with a synchronization signal. The sensors and actuators are mounted to a seat which is to be occupied by an inhabitant of the enclosure.
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公开(公告)号：WO1991006148A1
公开(公告)日：1991-05-02
申请号：PCT/US1990005823
申请日：1990-10-16
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
IPC: H03B01/00
CPC classification number: H04B3/00 , H03H21/0001
Abstract: An in-wire active cancelling system for cancelling undesirable repetitive signal components from a primary electronics signal comprising desired intelligent signal components and undesirable repetitive signal components. The primary electronic signal (101) is fed as an input to an electronic mixer (106). A second input of the electronic mixer (106) receives a repetitive cancelling signal generated by an active cancellation controller (103) to cancel the undesirable repetitive signal component from the primary signal (10) without interfering with passage of the primary signal intelligent signal components.
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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.
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.
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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.
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.
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Patent Agency Ranking
公开(公告)号：EP0615648A1
公开(公告)日：1994-09-21
申请号：EP92905531.0
申请日：1991-12-02
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
IPC: G10K11
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.
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公开(公告)号：EP0631685A1
公开(公告)日：1995-01-04
申请号：EP92915176.0
申请日：1992-03-19
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
Inventor： SMITH, Dexter , SCHWARTZ, Joseph , ZIEGLER, Eldon, W., Jr.
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.
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公开(公告)号：EP0521868A1
公开(公告)日：1993-01-13
申请号：EP91904237.0
申请日：1991-02-07
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
Inventor： ZIEGLER, Eldon, W., Jr.
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.
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公开(公告)号：EP0396666B1
公开(公告)日：1996-03-20
申请号：EP89910510.0
申请日：1989-08-30
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
Inventor： ZIEGLER, Eldon, W., Jr.
IPC: G06F17/10
CPC classification number: H03H21/0012 , G10K11/178 , G10K2210/3044 , G10K2210/3051 , G10K2210/3053 , G10K2210/3222 , G10K2210/503 , G10K2210/511
Abstract: A cancellation system including a processor having single adaptive filters adapting its filtering characteristic as a function of a phenomena signal and phenomena timing signal and a phase circuit to maintain the adapting of the filtering characteristics within 90 degrees phase of the phenomena signal. The phase circuit has the capability to measure the delays of the processor and the environment.
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公开(公告)号：EP0496797A1
公开(公告)日：1992-08-05
申请号：EP90915900.0
申请日：1990-10-16
Applicant: NOISE CANCELLATION TECHNOLOGIES, INC.
Inventor： ZIEGLER, Eldon, W., Jr. , GARDNER, John, W.
CPC classification number: H04B3/00 , H03H21/0001
Abstract: Système d'annulation active en circuit permettant d'annuler des composantes de signal répétitives indésirables d'un signal électronique primaire comprenant des composantes de signal intelligentes voulues ainsi que des composantes de signal répétitives indésirables. Le signal (101) électronique primaire est transmis en tant qu'entrée à un mélangeur (106) électronique. Une seconde entrée dudit mélangeur (106) électronique reçoit un signal d'annulation répétitive généré par un contrôleur (103) d'annulation active, destiné à annuler la composante du signal répétitive indésirable du signal (10) primaire, sans gêner le passage des composantes de signal intelligentes du signal primaire.
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