DE3682147D1 - NOISE REDUCTION DEVICE. - Google Patents
NOISE REDUCTION DEVICE.Info
- Publication number
- DE3682147D1 DE3682147D1 DE8686305415T DE3682147T DE3682147D1 DE 3682147 D1 DE3682147 D1 DE 3682147D1 DE 8686305415 T DE8686305415 T DE 8686305415T DE 3682147 T DE3682147 T DE 3682147T DE 3682147 D1 DE3682147 D1 DE 3682147D1
- Authority
- DE
- Germany
- Prior art keywords
- noise
- microphone
- output
- pick
- cancelling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- G10K11/17821—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 input signals only
- G10K11/17825—Error signals
-
- 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
- G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
-
- 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
- G10K2210/3012—Algorithms
-
- 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
- G10K2210/3013—Analogue, i.e. using analogue computers or circuits
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Control Of Amplification And Gain Control (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Noise Elimination (AREA)
- Surgical Instruments (AREA)
Abstract
An automatic gain active noise reduction arrangement for reducing the level of acoustic noise within the internal cavity or enclosure of an ear-defender or earphone structure (2), the arrangement comprises a noise pick-up microphone (4) and a noise-cancelling transducer (9) mounted within said cavity or enclosure, the noise pick-up microphone (4) being adapted to produce an electrical signal output in response to an acoustic noise field within said cavity or enclosure, and phase inverter means (5), filtering means (6) and amplifying (8) means connected in a feedback control path extending between the noise pick-up microphone (4) and the noise-cancelling transducer (9) and effective in response to the generation of an electrical signal output by the noise pick-up microphone (4) to produce a noise-cancelling signal output which is fed to the noise-cancelling transducer (9), in which the output from the noise pick-up microphone (4) is also applied to signal processing (10,11) and control means (7) for producing an electrical output which is dependent upon the microphone output and a predetermined non-linear control algorithm and which is applied to variable loop gain control means coupled with the feedback control path for controlling the loop gain in accordance with a preselected parameter of the microphone output.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858517716A GB8517716D0 (en) | 1985-07-13 | 1985-07-13 | Noise reduction arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3682147D1 true DE3682147D1 (en) | 1991-11-28 |
Family
ID=10582241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8686305415T Expired - Fee Related DE3682147D1 (en) | 1985-07-13 | 1986-07-14 | NOISE REDUCTION DEVICE. |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0212840B1 (en) |
AT (1) | ATE68903T1 (en) |
DE (1) | DE3682147D1 (en) |
GB (1) | GB8517716D0 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8717043D0 (en) * | 1987-07-20 | 1987-08-26 | Plessey Co Plc | Noise reduction systems |
CA1299725C (en) * | 1987-07-20 | 1992-04-28 | Robert Christopher Twiney | Noise reduction systems |
WO1990002513A1 (en) * | 1988-09-16 | 1990-03-22 | Noise Cancellation Technologies, Inc. | Active attenuation system for medical patients |
US5091954A (en) * | 1989-03-01 | 1992-02-25 | Sony Corporation | Noise reducing receiver device |
US5117461A (en) * | 1989-08-10 | 1992-05-26 | Mnc, Inc. | Electroacoustic device for hearing needs including noise cancellation |
US5001763A (en) * | 1989-08-10 | 1991-03-19 | Mnc Inc. | Electroacoustic device for hearing needs including noise cancellation |
US5134659A (en) * | 1990-07-10 | 1992-07-28 | Mnc, Inc. | Method and apparatus for performing noise cancelling and headphoning |
US5313945A (en) * | 1989-09-18 | 1994-05-24 | Noise Cancellation Technologies, Inc. | Active attenuation system for medical patients |
GB9003938D0 (en) * | 1990-02-21 | 1990-04-18 | Ross Colin F | Noise reducing system |
US5182774A (en) * | 1990-07-20 | 1993-01-26 | Telex Communications, Inc. | Noise cancellation headset |
GB9107416D0 (en) * | 1991-04-09 | 1991-05-22 | Active Noise & Vibration Tech | Active noise reduction |
GB2274757A (en) * | 1993-01-28 | 1994-08-03 | Secr Defence | Ear defenders employing active noise control |
ES2281160T3 (en) * | 1993-06-23 | 2007-09-16 | Noise Cancellation Technologies, Inc. | VARIABLE GAIN ACTIVE NOISE CANCELLATION SYSTEM WITH IMPROVED RESIDUAL NOISE DETECTION. |
US5524058A (en) * | 1994-01-12 | 1996-06-04 | Mnc, Inc. | Apparatus for performing noise cancellation in telephonic devices and headwear |
GB2289960A (en) * | 1994-06-03 | 1995-12-06 | Mazda Motor | Adaptive gain control |
US5675658A (en) * | 1995-07-27 | 1997-10-07 | Brittain; Thomas Paige | Active noise reduction headset |
EP1297523A1 (en) * | 2000-03-07 | 2003-04-02 | Slab DSP Limited | Active noise reduction system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2097629B (en) * | 1981-04-15 | 1984-09-26 | Nat Res Dev | Methods and apparatus for active sound control |
-
1985
- 1985-07-13 GB GB858517716A patent/GB8517716D0/en active Pending
-
1986
- 1986-07-14 AT AT86305415T patent/ATE68903T1/en not_active IP Right Cessation
- 1986-07-14 DE DE8686305415T patent/DE3682147D1/en not_active Expired - Fee Related
- 1986-07-14 EP EP86305415A patent/EP0212840B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0212840A3 (en) | 1987-09-23 |
EP0212840A2 (en) | 1987-03-04 |
EP0212840B1 (en) | 1991-10-23 |
ATE68903T1 (en) | 1991-11-15 |
GB8517716D0 (en) | 1985-08-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8327 | Change in the person/name/address of the patent owner |
Owner name: BAE SYSTEMS (DEFENCE SYSTEMS) LTD., FARNBOROUGH, H |
|
8339 | Ceased/non-payment of the annual fee |