NO752163L - - Google Patents
Info
- Publication number
- NO752163L NO752163L NO752163A NO752163A NO752163L NO 752163 L NO752163 L NO 752163L NO 752163 A NO752163 A NO 752163A NO 752163 A NO752163 A NO 752163A NO 752163 L NO752163 L NO 752163L
- Authority
- NO
- Norway
- Prior art keywords
- channel
- frequency
- phase
- loop
- equalization
- Prior art date
Links
- 230000035945 sensitivity Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 238000012546 transfer Methods 0.000 description 17
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0333—Noise absorbers by means of an active system
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17819—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17857—Geometric disposition, e.g. placement of microphones
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/112—Ducts
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3011—Single acoustic input
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/50—Miscellaneous
- G10K2210/506—Feedback, e.g. howling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Mechanical Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Duct Arrangements (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB27679/74A GB1512014A (en) | 1974-06-21 | 1974-06-21 | Method of attenuating longitudinal compression waves travelling in a gas filled duct |
Publications (1)
Publication Number | Publication Date |
---|---|
NO752163L true NO752163L (fr) | 1975-12-23 |
Family
ID=10263521
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO752163A NO752163L (fr) | 1974-06-21 | 1975-06-17 |
Country Status (7)
Country | Link |
---|---|
BE (1) | BE830489A (fr) |
DE (1) | DE2527642A1 (fr) |
FR (1) | FR2275722A1 (fr) |
GB (1) | GB1512014A (fr) |
NO (1) | NO752163L (fr) |
SE (1) | SE7507087L (fr) |
ZA (1) | ZA753895B (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2386881A1 (fr) * | 1977-04-05 | 1978-11-03 | Sound Attenuators Ltd | Perfectionnements relatifs a l'attenuation active de sons |
EP0040462A1 (fr) * | 1980-05-16 | 1981-11-25 | Bose Corporation | Appareil électro-acoustique pour réduire le bruit audible |
US4473906A (en) * | 1980-12-05 | 1984-09-25 | Lord Corporation | Active acoustic attenuator |
DE4441217C2 (de) * | 1993-12-17 | 1998-09-10 | Voith Sulzer Papiermasch Gmbh | Verfahren zur Dämpfung von Druckstößen sowie Vorrichtung zur Durchführung des Verfahrens |
FR2740599B1 (fr) * | 1995-10-30 | 1997-12-19 | Technofirst | Dispositif d'attenuation acoustique active destine a etre dispose a l'interieur d'un conduit, en particulier pour l'insonorisation de reseau de ventilation et/ou de climatisation |
FR2783869B1 (fr) * | 1998-09-24 | 2000-12-22 | Ecia Equip Composants Ind Auto | Systeme anti-bruit de ligne d'echappement de vehicule automobile |
DE10021031A1 (de) * | 2000-05-02 | 2001-11-08 | Mann & Hummel Filter | Leitungssystem mit elektromechanischem Wandler zur Erzeugung eines Korrekturgeräusches |
GB2362058A (en) * | 2000-05-04 | 2001-11-07 | Thorn Security | Equalising transfer functions of linear electro-acoustic systems |
FR2843999B1 (fr) * | 2002-09-03 | 2006-01-27 | Comptoir De La Technologie | Dispositif actif d'attenuation du bruit de bouche au niveau d'un conduit d'echappement ou d'admission |
US6792907B1 (en) * | 2003-03-04 | 2004-09-21 | Visteon Global Technologies, Inc. | Helmholtz resonator |
-
1974
- 1974-06-21 GB GB27679/74A patent/GB1512014A/en not_active Expired
-
1975
- 1975-06-17 NO NO752163A patent/NO752163L/no unknown
- 1975-06-17 ZA ZA00753895A patent/ZA753895B/xx unknown
- 1975-06-19 SE SE7507087A patent/SE7507087L/xx unknown
- 1975-06-20 DE DE19752527642 patent/DE2527642A1/de active Pending
- 1975-06-20 BE BE157551A patent/BE830489A/fr not_active IP Right Cessation
- 1975-06-23 FR FR7519519A patent/FR2275722A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
AU8232575A (en) | 1976-12-23 |
GB1512014A (en) | 1978-05-24 |
ZA753895B (en) | 1976-05-26 |
DE2527642A1 (de) | 1976-01-08 |
SE7507087L (sv) | 1975-12-22 |
FR2275722A1 (fr) | 1976-01-16 |
FR2275722B1 (fr) | 1981-06-19 |
BE830489A (fr) | 1975-10-16 |
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