[특허]Active attenuation system with on-line modeling of speaker, error path and feedback pack

[미국특허] Active attenuation system with on-line modeling of speaker, error path and feedback pack 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G10K-011/16 H04R-001/28
출원번호	US-0828454 (1986-02-11)
발명자 / 주소	Eriksson Larry J. (Madison WI)
출원인 / 주소	Nelson Industries, Inc. (Stoughton WI 02)
인용정보	피인용 횟수 : 68 인용 특허 : 10

초록 ▼

An active acoustic attenuation system is provided that actively models direct and feedback paths as well as characteristics of the secondary cancelling sound source and the error path on an on-line basis. The primary model uses a recursive least mean squares RLMS algorithm that is excited by the input acoustic noise and uses the residual acoustic noise as an error signal. The secondary sound source or cancelling speaker and the error path are modeled by a second algorithm, particularly an LMS algorithm, that uses an additional auxiliary low level, random, uncorrelated noise source as an input signal. The resulting overall system provides excellent attenuation of narrow band and broad band noise over a relatively wide frequency range on a completely adaptive basis without directional transducers.

대표청구항 ▼

In an acoustic system having an input for receiving an input acoustic wave and an output for radiating an output acoustic wave, an active attenutation method for attenuating undesirable said output acoustic wave by introducing a cancelling acoustic wave from an output transducer, comprising: sensing the combined said output acoustic wave and said cancelling acoustic wave from said output transducer with an error transducer and providing an error signal; modeling said acoustic system with an adaptive filter model having an error input from said error transducer and outputting a correction signal to said output transducer to introduce the cancelling acoustic wave such that said error signal approaches a given value; providing an auxiliary noise source and introducing noise therefrom into said model, such that said error transducer also senses the auxiliary noise from said auxiliary noise source.

이 특허에 인용된 특허 (10) 인용/피인용 타임라인 분석

Warnaka Glenn E. (Erie PA) Poole Lynn A. (State College PA) Tichy Jiri (State College PA), Active acoustic attenuator.
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Warnaka, Glenn E.; Zalas, John M., Active attenuation of noise in a closed structure.
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Swinbanks Malcolm A. (Pentlands Close GB2), Attenuation of sound waves.
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Swinbanks Malcolm A. (Pentlands Close GB2), Attenuation of sound waves.
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Miller Harry B. (Niantic CT), Electronic noise-reducing system.
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Ross Colin F. (Cambridge GB2), Method and apparatus for active sound control.
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Chaplin, George B. B., Method and apparatus for cancelling vibration.
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Chaplin George B. B. (Colchester GB2) Smith Roderick A. (Colchester GB2), Method and apparatus for cancelling vibrations.
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Chaplin George B. B. (Colchester GBX) Jones Andrew (Colchester GBX) Jones Owen (Doncaster GBX), Method and apparatus for low frequency active attenuation.
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Davidson ; Jr. Allen R. (Bowie MD) Robinson Timothy G. F. (Severna Park MD), Noise cancellation apparatus.
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이 특허를 인용한 특허 (68) 인용/피인용 타임라인 분석

Eatwell, Graham P., Acoustic system identification using acoustic masking.
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Eriksson Larry J. (Madison WI) Allie Mark C. (Oregon WI) Hoops Richard H. (Stoughton WI), Active acoustic attenuation system for higher order mode non-uniform sound field in a duct.
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Allie Mark C. (Oregon WI), Active acoustic attenuation system with differential filtering.
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Eriksson Larry J. (Madison WI), Active acoustic attenuation system with overall modeling.
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Eriksson Larry J. (Madison WI) Allie Mark C. (Oregon WI), Active acoustic attenuation system with reduced convergence time.
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Allie Mark C. (Oregon WI) Popovich Steven R. (Stoughton WI), Active adaptive control system with spectral leak.
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Trantow Jerry J. (Madison WI) Finn Brian M. (Madison WI), Active adaptive control system with weight update selective leakage.
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Laak Trevor A. (Madison WI), Active attenuation system with on-line modeling of feedback path.
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Southward Steve C. (Cary NC) Rosetti Dino J. (Raleigh NC) Jolly Mark R. (Holly Springs NC), Active control of noise and vibration.
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Hersh Alan S. ; Walker Bruce E. ; Heidelberg Larry, Active control source cancellation and active control Helmholtz resonator absorption of axial fan rotor-stator interaction noise.
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Ohashi Tadashi,JPX, Active noise control apparatus and waveform transforming apparatus through neural network.
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Sen M. Kuo, Active noise control system and method for on-line feedback path modeling.
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Finn Alan M. (Amston CT), Active noise control system using phased-array sensors.
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Zhang, Ming; Lan, Hui; Ser, Wee, Active noise control system with on-line secondary path modeling.
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Popovich Steven R., Adaptive control system with efficiently constrained adaptation.
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Theverapperuma, Lalin; Youssef, Talal Aly, Adaptive digital noise canceller.
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Laak ; Jr. Trevor A. ; Kapsos ; Jr. David W., Adaptive passive acoustic attenuation system.
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Popovich Steven R. (Stoughton WI), Adaptive tonal control system with constrained output and adaptation.
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Pedersen Douglas G. (Middleton WI) Laak Trevor A. (Madison WI), Coherence optimized active adaptive control system.
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Russell Steve F. (Ames IA) Doherty John F. (Ames IA), Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation.
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Eriksson Larry J. (Madison WI) Allie Mark C. (Oregon WI), Communication system with active noise cancellation.
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Popovich Steven R. (Stoughton WI), Fast adapting control system and method.
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Steenhagen Shawn K. ; Southward Steve C. ; Delfosse Kent F., Frequency selective active adaptive control system.
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Shoureshi Rahmat (West Lafayette IN), Method and apparatus for intelligent active and semi-active vibration control.
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Ohashi Tadashi (Kawasaki JPX) Fujii Kensaku (Kawasaki JPX) Ohga Juro (Kawasaki JPX), Method and apparatus of determining the sound transfer characteristic of an active noise control system.
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Cheng C. Raymond ; McIntosh Jason D. ; Zuroski Michael T. ; Eriksson Larry J., Tunable acoustic system.
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[미국특허] Active attenuation system with on-line modeling of speaker, error path and feedback pack 원문보기