EP0539940B1 - Active noise cancellation system - Google Patents
Active noise cancellation system Download PDFInfo
- Publication number
- EP0539940B1 EP0539940B1 EP92118416A EP92118416A EP0539940B1 EP 0539940 B1 EP0539940 B1 EP 0539940B1 EP 92118416 A EP92118416 A EP 92118416A EP 92118416 A EP92118416 A EP 92118416A EP 0539940 B1 EP0539940 B1 EP 0539940B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- noise
- cancellation
- signal
- generating
- gain
- 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 - Lifetime
Links
Images
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
- G10K11/17823—Reference signals, e.g. ambient acoustic environment
-
- 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
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
- G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
-
- 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
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
-
- 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
- G10K2210/128—Vehicles
-
- 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
- G10K2210/30—Means
- G10K2210/301—Computational
- G10K2210/3045—Multiple acoustic inputs, single acoustic output
-
- 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
- G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
Definitions
- an active noise cancellation system for a motor vehicle, comprising means for generating one or more electrical signals proportional to the noise in the target area, an electronic means receiving these signals, such as an adaptive filter, for generating a cancellation noise signal, one or more sound sources connected to said electronic means for generating cancellation noise in the target area, and one or more sensors for detecting residual noise in the target area and transmitting it in an electrical form to the electronic means to tune its operation.
- FIG. 1 in the accompanying drawings represents schematically the main principle of an active noise cancellation system
- Figure 2 shows a block diagram corresponding to this basic schematic drawing.
- a conventional system for active noise cancellation of the kind shown in Figure 1 comprises noise detection sensors 1 generating an electrical signal proportional to the noise present in the target area.
- These detection sensors can be either microphones, in which case the signal generated by them corresponds to the noise in the target area, or the detection sensors may also be of another type, in which case they generate for instance only a reference signal proportional to the rotation speed of the vehicle motor.
- the signals generated by the detection sensors 1 need not correspond to the actual noise, but only be correlated with it.
- These detection sensor signals are conveyed to an electronic means 2 generating a noise cancellation signal, which most commonly is an adaptive filter.
- This adaptive filter calculates by means of a suitable algorithm, such as an LMS algorithm or a Fan-Vemuri algorithm, a signal which in amplitude corresponds to the produced noise signal but is of an opposite phase thereto.
- a suitable algorithm such as an LMS algorithm or a Fan-Vemuri algorithm
- Such a cancellation noise signal is reproduced by cancellation noise sources, such as loudspeakers 3, to generate cancellation noise in the target area. Attenuation of the noise is achieved as a combined result of the actual noise and the cancellation noise of an opposite phase.
- noise can be cancelled by such an arrangement about 10 -30 dB for instance at the motor noise frequency.
- the system further comprises residual noise sensors 4 which have been adapted to detect residual noise in the target area and control the means 2 for generating the cancellation noise in response to this.
- FIG. 2 shows a block diagram corresponding to the system of Figure 1.
- the signal generated by the noise detection sensor 1 has been denoted by the reference character x, which signal is inputted in a means 2 for generating a cancellation noise signal, which generates a signal y that is a function of the noise signal x.
- This signal y is then reproduced by a loudspeaker 3, in which situation the signal proceeds as a sound wave via a transmission route H to a sensor 4 for residual noise.
- This sensor 4 for residual noise which may in practice be for instance a microphone, generates an electrical signal e which may be represented as a function H(y)+n, wherein n is noise in the microphone 4.
- the document FR-A-2 531 023 discloses an active noise cancellation system to be used in motor vehicles.
- the system of the invention which is characterized in that an amplifier has been disposed between the sound source or sources of cancellation noise and the means for generating a cancellation noise signal to control the gain of the cancellation noise signal in response to a signal proportional to the rotation speed of the vehicle motor.
- the stability problem has now been solved by varying the gain of the cancellation noise signal in dependence on the frequency and specifically in dependence on the rotation speed of the vehicle motor.
- the gain of the cancellation noise signal is increased when the rotation speed of the motor decreases.
- Figure 3 represents a block diagram of the sound cancellation system of the invention, wherein an additional amplifier 5 has been disposed between the sound source of cancellation noise 3 and the means 2 for generating the cancellation noise signal, said additional amplifier being controlled as a function of the signal z.
- this signal z is proportional to the rotation speed of the vehicle motor.
- the gain of the signal y generated by the amplifier 5 is an inverse function of the frequency of this signal z.
- the gain of the amplifier 5 is reduced, and respectively as the frequency of the signal z decreases, i.e. the rotation speed of the vehicle motor decreases, the gain is boosted.
- Increasing the gain at low frequencies is necessary in order for the loudspeaker 3 to be able to reproduce also these frequencies with a sufficient amplitude.
- the gain of the amplifier 5 and specifically its variation as a function of the frequency of signal z must be adapted to the practical conditions prevailing in each case.
- the essential feature is that the gain of the amplifier 5 is controlled in dependence on the rotation speed of the vehicle motor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI915143A FI94563C (fi) | 1991-10-31 | 1991-10-31 | Aktiivinen melunvaimennusjärjestelmä |
FI915143 | 1991-10-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0539940A1 EP0539940A1 (en) | 1993-05-05 |
EP0539940B1 true EP0539940B1 (en) | 1996-04-24 |
Family
ID=8533403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92118416A Expired - Lifetime EP0539940B1 (en) | 1991-10-31 | 1992-10-28 | Active noise cancellation system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0539940B1 (un) |
JP (1) | JP3412846B2 (un) |
DE (1) | DE69210169T2 (un) |
FI (1) | FI94563C (un) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8077873B2 (en) | 2009-05-14 | 2011-12-13 | Harman International Industries, Incorporated | System for active noise control with adaptive speaker selection |
US8135140B2 (en) | 2008-11-20 | 2012-03-13 | Harman International Industries, Incorporated | System for active noise control with audio signal compensation |
US8189799B2 (en) | 2009-04-09 | 2012-05-29 | Harman International Industries, Incorporated | System for active noise control based on audio system output |
US8199924B2 (en) | 2009-04-17 | 2012-06-12 | Harman International Industries, Incorporated | System for active noise control with an infinite impulse response filter |
US8718289B2 (en) | 2009-01-12 | 2014-05-06 | Harman International Industries, Incorporated | System for active noise control with parallel adaptive filter configuration |
US9020158B2 (en) | 2008-11-20 | 2015-04-28 | Harman International Industries, Incorporated | Quiet zone control system |
DE102004006604B4 (de) * | 2004-02-11 | 2020-03-12 | Volkswagen Ag | Einrichtung und Verfahren zur Verringerung von Geräuschen im Innenraum eines Kraftfahrzeuges |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2265277B (en) * | 1992-03-17 | 1996-07-24 | Fuji Heavy Ind Ltd | Noise reduction system for automobile compartment |
JP3410141B2 (ja) * | 1993-03-29 | 2003-05-26 | 富士重工業株式会社 | 車室内騒音低減装置 |
US5692055A (en) * | 1996-09-24 | 1997-11-25 | Honda Giken Kogyo Kabushiki Kaisha | Active noise-suppressive control method and apparatus |
ES2143952B1 (es) * | 1998-05-20 | 2000-12-01 | Univ Madrid Politecnica | Atenuador activo de ruido acustico mediante algoritmo adaptativo genetico. |
EP3245651B1 (de) * | 2016-04-06 | 2018-10-03 | Eberspächer Exhaust Technology GmbH & Co. KG | System und verfahren zur aktiven schallbeeinflussung |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS599699A (ja) * | 1982-07-07 | 1984-01-19 | 日産自動車株式会社 | 自動車の車室内音場制御装置 |
FR2531023B1 (fr) * | 1982-08-02 | 1987-04-30 | Peugeot | Dispositif d'attenuation du bruit dans l'habitacle d'un vehicule automobile |
-
1991
- 1991-10-31 FI FI915143A patent/FI94563C/fi not_active IP Right Cessation
-
1992
- 1992-10-28 DE DE69210169T patent/DE69210169T2/de not_active Expired - Lifetime
- 1992-10-28 EP EP92118416A patent/EP0539940B1/en not_active Expired - Lifetime
- 1992-10-30 JP JP29280692A patent/JP3412846B2/ja not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004006604B4 (de) * | 2004-02-11 | 2020-03-12 | Volkswagen Ag | Einrichtung und Verfahren zur Verringerung von Geräuschen im Innenraum eines Kraftfahrzeuges |
US8135140B2 (en) | 2008-11-20 | 2012-03-13 | Harman International Industries, Incorporated | System for active noise control with audio signal compensation |
US8270626B2 (en) | 2008-11-20 | 2012-09-18 | Harman International Industries, Incorporated | System for active noise control with audio signal compensation |
US8315404B2 (en) | 2008-11-20 | 2012-11-20 | Harman International Industries, Incorporated | System for active noise control with audio signal compensation |
US9020158B2 (en) | 2008-11-20 | 2015-04-28 | Harman International Industries, Incorporated | Quiet zone control system |
US8718289B2 (en) | 2009-01-12 | 2014-05-06 | Harman International Industries, Incorporated | System for active noise control with parallel adaptive filter configuration |
US8189799B2 (en) | 2009-04-09 | 2012-05-29 | Harman International Industries, Incorporated | System for active noise control based on audio system output |
US8199924B2 (en) | 2009-04-17 | 2012-06-12 | Harman International Industries, Incorporated | System for active noise control with an infinite impulse response filter |
US8077873B2 (en) | 2009-05-14 | 2011-12-13 | Harman International Industries, Incorporated | System for active noise control with adaptive speaker selection |
Also Published As
Publication number | Publication date |
---|---|
FI915143A (fi) | 1993-05-01 |
FI94563C (fi) | 1995-09-25 |
JPH05241581A (ja) | 1993-09-21 |
FI915143A0 (fi) | 1991-10-31 |
EP0539940A1 (en) | 1993-05-05 |
FI94563B (fi) | 1995-06-15 |
DE69210169D1 (de) | 1996-05-30 |
DE69210169T2 (de) | 1996-10-02 |
JP3412846B2 (ja) | 2003-06-03 |
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