WO2006051602A1 - 騒音低減装置 - Google Patents
騒音低減装置 Download PDFInfo
- Publication number
- WO2006051602A1 WO2006051602A1 PCT/JP2004/016862 JP2004016862W WO2006051602A1 WO 2006051602 A1 WO2006051602 A1 WO 2006051602A1 JP 2004016862 W JP2004016862 W JP 2004016862W WO 2006051602 A1 WO2006051602 A1 WO 2006051602A1
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- WO
- WIPO (PCT)
- Prior art keywords
- control
- sound
- noise
- speaker
- microphone
- Prior art date
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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
- G10K11/1785—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
- G10K11/1781—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
-
- 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
- G10K11/17879—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
- G10K2210/12—Rooms, e.g. ANC inside a room, office, concert hall or automobile cabin
-
- 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
- G10K2210/124—Traffic
Definitions
- the present invention relates to a noise reduction device, and in particular, noise generated when a moving body moves, for example, noise generated when a vehicle travels on an expressway is reduced outside the noise barrier.
- the present invention relates to a sound reduction device.
- a linear array sound source composed of a speaker unit composed of a plurality of speakers is arranged along the upper side of the soundproof wall, and is calculated by the explicit method.
- a noise reduction device that emits a control sound having a phase opposite to that of the diffracted sound of the noise by using the filter coefficient and the acoustic signal of the noise detected by the microphone to reduce the noise at the control point.
- the SE system is known.
- the ASE system is a local control that assumes the control point as the apex of the sound barrier, and since the ASE system itself functions independently, the control area can be expanded if the ASE system is continuously arranged. There is no problem of interference of control sound.
- Patent Document 2 WO03Z 0 147 147 A1
- a problem to be solved is that noise propagated from a plurality of directions cannot be efficiently reduced.
- the first invention is a speaker unit having a plurality of speakers arranged so that a sound emission direction is directed to a predetermined direction, and is arranged so as to correspond to the speaker unit, and collects noise.
- a first microphone that outputs a first acoustic signal corresponding to the sound that has been sounded and collected, and an arrangement positional force of the first microphone.
- a second microphone that collects and outputs a second acoustic signal corresponding to the collected noise, and a direct sound or diffraction of the noise collected by the first microphone based on the first acoustic signal.
- First control signal output means for outputting a first control signal for emitting a control sound for reducing sound
- the second microphone collects sound based on the second acoustic signal.
- Reduces direct or diffracted noise A second control signal output means for outputting a plurality of second control signals, each of which is a signal for emitting a control sound to be output, each being delayed by a predetermined time, and the first control signal Are simultaneously input to each of the spinning forces, and each of the second control signals is set so that the delay time gradually increases as the speaker force at one end of the speaker unit is directed toward the speaker at the other end.
- control means for controlling to be inputted to each of the speakers.
- the second invention is a speaker unit having a plurality of speakers arranged so that a sound emission direction is directed to a predetermined direction, and is arranged so as to correspond to the speaker unit, and collects noise.
- a first microphone that outputs a first acoustic signal corresponding to the sound that has been sounded and collected, and an arrangement positional force of the first microphone.
- a second microphone that collects and outputs a second acoustic signal corresponding to the collected noise, and an arrangement positional force of the first microphone.
- a third microphone arranged in a row direction at a position away from the second microphone in the opposite direction, collecting noise and outputting a third acoustic signal corresponding to the collected noise;
- a first control signal for outputting a direct sound or a control sound for reducing diffraction sound collected by the first microphone is output based on the first acoustic signal.
- a signal for emitting a control sound for reducing a direct sound or a diffracted sound of the noise collected by the second microphone based on the control signal output means and the second acoustic signal,
- Second control signal output means for outputting a plurality of second control signals, each of which is delayed by a predetermined time, and the third microphone mouthphone based on the third acoustic signal.
- a third control signal output means for outputting a plurality of third control signals, each of which is delayed by a predetermined time, and the first control signal is simultaneously input to each of the speakers.
- Each of the second control signals is input to each of the spinning forces so that the delay time gradually increases from the speaker on one end side of the speaker unit toward the speaker on the other end side, and the speaker Control means for controlling each of the third control signals to be input to each of the speakers such that the delay time gradually decreases from the speaker on one end side of the unit toward the speaker on the other end side; Is included.
- a plurality of speakers are arranged so that a sound emission direction is directed to a predetermined direction, and a plurality of speaker units arranged adjacent to each other, and corresponding to each of the speaker units.
- a plurality of microphones that collect noise and output acoustic signals corresponding to the collected noise, and corresponding to each of the speaker units, and corresponding to the corresponding speaker units.
- the first control Based on the acoustic signal output from the first corresponding microphone, the first control for emitting a control sound that reduces the direct sound or diffraction sound of the noise collected by the first corresponding microphone.
- a first control signal output means for outputting a signal and a corresponding one of the speaker units and a speaker unit adjacent to the corresponding speaker unit.
- the second corresponding microphone Based on the acoustic signal output from the second corresponding microphone mouthphone, the second corresponding microphone outputs a second sound for emitting a direct sound of the noise collected or a control sound for reducing the diffracted sound.
- Output control signal The second control signal output means for outputting the sound and the third corresponding microphone force corresponding to the other speaker unit adjacent to the corresponding speaker unit are also output.
- Third control signal output means for outputting a third control signal for emitting a direct sound or a control sound for reducing the diffracted sound collected by the third corresponding microphone based on the signal;
- Each of the speaker units is provided to input a signal, and the first control signal is simultaneously input to each of the speaker units that input the signal, and the speaker unit that inputs the signal
- Each of the second control signals inputs the signal so that the delay time gradually increases from the speaker on one end to the speaker on the other end.
- Each of the third control signals is input to each of the speakers of the mobile station and the delay time is gradually shortened from the speaker on one end side of the speaker unit that inputs the signal toward the speaker on the other end side.
- a control means for controlling so as to be input to each speaker of the speaker unit that inputs the signal.
- the present invention provides at least two types of control sounds that are simultaneously emitted from each speaker of the speaker unit and control sounds that are emitted from each speaker after being delayed by a predetermined time.
- the main feature is to emit control sounds, that is, multiple control sounds with different propagation directions.
- the noise reduction device of the present invention has an advantage that noise can be efficiently reduced even when a plurality of directional force noises are propagated since the control sound is emitted from the speaker unit in a plurality of directions. .
- FIG. 1 is a side view showing a state in which a noise reduction device is attached to a soundproof wall.
- Example 1 [FIG. 2] It is a top view which shows the state which attached the noise reduction apparatus to the soundproof wall.
- Example 1 [FIG. 3] A signal force output from one microphone.
- FIG. 3 is an explanatory diagram showing a speech force unit to which a generated control signal is input. (Example 1)
- FIG. 4 is a circuit diagram showing details of a control circuit. (Example 1)
- FIG. 5 is an explanatory diagram showing a path of diffracted sound of noise propagating to a control point.
- FIG. 6 is an explanatory diagram showing the passage of time of the sound pressure level of noise at a control point.
- FIG. 7 is a block diagram showing a filter portion of the noise reduction device. (Example 2)
- FIG. 8 is a block diagram showing a filter portion of the noise reduction device. (Example 3)
- FIG. 9] (1)-(5) is a modification showing the arrangement positions of the speaker unit and the microphone.
- This embodiment is used when the distorted sound of the noise diffracted from the noise barrier of the expressway and propagating outside the noise barrier is reduced by a control sound source (secondary sound source) installed outside the noise barrier.
- the invention is applied.
- a sound insulation plate 12 is attached horizontally and continuously along the top side of the soundproof wall 10 to the top side of the soundproof wall 10 of the highway.
- the sound insulation plate 12 helps to prevent howling between the sensor microphone and the control sound source (secondary sound source).
- the sound insulation plate 12 is not necessarily required by inserting an anti-howling circuit to suppress howling.
- the speaker units are arranged adjacent to each other.
- the speaker units may be arranged at predetermined intervals or in contact with each other.
- each speaker unit has a plurality of speakers 16 arranged so that sound emission directions are directed in the same direction.
- a linear sound source is composed of a plurality of speakers.
- the sound emission direction of one control sound emitted from each of the plurality of speakers of the present embodiment (the direction of the arrow with the reference symbol c described later) is the diffracted sound of the noise diffracted by the front force of the noise barrier.
- the direction of propagation that is, the direction orthogonal to the speaker array direction and diagonally downward (see Fig. 1).
- the speaker units are arranged linearly, the sound emission directions of the speaker units are all the same direction.
- Each speaker unit has a soundproof wall Therefore, when the soundproof wall is curved, the sound emission direction of the speaker unit is different.
- each microphone is preferably the center of the speaker unit.
- these microphones it is preferable to use superdirective microphones.
- a plurality of control signals for outputting a control sound for reducing the diffracted sound caused by the noise barrier of noise collected by the microphone from the speaker unit so as to correspond to each of the plurality of speaker units.
- control circuits can be configured by DSP. Each microphone is connected to an input end of each control circuit, and each microphone of each speaker unit is connected to an output end of each control circuit. Each of the control circuits is connected so as to input and output signals as shown in FIG.
- FIG. 1 shows a kth microphone, a speaker unit, and a control circuit.
- each of the control circuits will be described in detail with reference to FIG. Since each of the control circuits has the same configuration, the k-th control circuit 20 will be described and the configuration of the other control circuits k
- the control circuit 20 has three analog digital signals k that convert analog signals to digital signals.
- the k is output is connected.
- the analog-to-digital converter 30 input is connected to the output terminal of the analog-to-digital converter 30.
- Inverse filters 32 and 32 that output anti-phase control signals to the digital signal
- the filter coefficients W, W, W are respectively values.
- the filter coefficients W 1, W 2, and W 3 are noises measured in advance, and have an antiphase with respect to the measured noise.
- the filter coefficient that generates the control signal for emitting the control sound can be calculated and calculated.
- a microphone is placed at the control point, and the diffracted sound of the noise is propagated to the control point.
- Each force also emits a control sound, adjusts the filter coefficient of the inverse filter so that the output of the microphone placed at the control point is minimized, and sets the filter coefficient when the output of the microphone is minimized to the inverse filter You can do it! Even when the filter coefficient is set by the V and deviation method, a control signal is generated to emit a control sound that reduces the diffracted noise.
- the output end of the inverse filter 32c is connected to the input ends of 3-input 1-output adders 34, 34, 34,..., 34 provided in the same number as the number m of speakers of the speaker unit.
- Each unit adds the three input signals and outputs the result.
- Amplifier unit that amplifies the input signal 38, 38, 38, '38
- the output end of the inverse filter 32 is connected to a speaker unit via a digital analog converter 46.
- the output terminal of the inverse filter 32 is connected to the speaker via a digital analog converter 44.
- (AZD converters) 30 and 30 are the control circuit 20, control circuit 20, control circuit 20, etc.
- FIG. 4 shows that the control circuit 20, the control circuit 20, the control circuit 20, etc. are continuously arranged and k ⁇ 1 k k + 1.
- each control circuit has an independent master clock.
- the output end of the analog / digital converter ⁇ 30 is the same as the number m of speakers in the speaker unit.
- the delay times ⁇ , ⁇ , ⁇ ,... ⁇ of the delay elements are, for example, 0, ⁇ , 2
- ⁇ , ⁇ (m-1) can be set.
- the output end of the analog / digital converter ⁇ 30 is the same as the number m of speakers in the speaker unit.
- a number of input signals are respectively ⁇ ,
- the delay times ⁇ , ⁇ , ⁇ , * ... ⁇ of the delay element are the delay elements of the above delay circuit.
- Delay times similar to the child delay times for example, 0, ⁇ , 2 ⁇ ,... (M-1) are set.
- Each of the delay elements 40, 40, 40,... 40 is added to each of the adders 34, 34, 34,.
- each of the delay elements 42, 42, 42,... 42 includes delay elements 40, 40, 40,.
- the signal from the maximum delay time to the signal of the minimum delay time is directed to the speaker on the other end side from the speaker on one end side of the speaker unit via the adder circuit, the digital-analog converter, and the amplifier.
- Delay control signals are input to each speaker in order so that the delay time gradually decreases.
- the signal is input to the speaker unit 14 via the control circuit 20 and the control circuit 20 corresponding to the other speaker unit 14 kk + 1 adjacent to the speaker unit 14.
- Noise generated by a vehicle traveling on a highway is collected by each microphone, an acoustic signal corresponding to the noise collected from each microphone is output, and each analog-digital converter connected to the microphone is connected. Is converted into a digital signal and input to each of the inverse filters. In each of the inverse filters, a control signal having an antiphase with respect to the input digital signal is generated by the digital filtering process using the input digital signal and a preset filter coefficient. Is output.
- control signal force output with the inverse filter 32 force is also added.
- the control sound is emitted in a direction orthogonal to the speaker arrangement direction of the speaker unit and in an obliquely downward direction (arrow direction with a symbol c), and the diffracted sound of noise propagating in the arrow direction with a symbol c is generated. Reduced at control points. Note that the synthetic wavefront of the control sound at this time is parallel to the speaker arrangement direction of the speaker unit.
- control signal power of the inverse filter 32 force of the control circuit 20 is also output.
- Delay circuit k-1 k k via analog-to-digital converter 30 of switching converter 44 and control circuit 20
- Each of the control signals (delay control signals) is added to the adders 34, 34, 34 in order of increasing delay time.
- Control signal is digital to analog converter 36
- each of the delay control signals is sequentially input to each speaker of the speaker unit so that the delay time gradually increases with the speaker force at one end of the force unit also directed toward the speaker at the other end.
- the control sounds emitted from the speakers are synthesized, and a combined wavefront is formed in a direction inclined by an angle ⁇ represented by the following formula with respect to the speaker arrangement direction of the speaker unit. Sound is emitted in the direction of the arrow with R. This is equivalent to the control sound being emitted from the virtual sound source A (see Fig. 3) inclined at an angle ⁇ , so that the distorted sound of the noise propagating in the direction of the arrow with the symbol R appears at the control point. And reduced.
- ⁇ is positive in the clockwise direction with respect to the speaker arrangement direction.
- control filter power of the control circuit 20 is output by 32 forces.
- each signal is added to the adder 34, 34, 34, 34,
- the speaker unit 14 through the amplifiers 38, 38, 38,
- the distance to the source B is d2, and the processing time of the control circuit is T (assuming that the processing time is approximately equal though it passes through the analog-digital converter and the digital-analog converter to form a virtual sound source) Since dl ⁇ d2, it is preferable to determine the processing time of the control circuit so that the following equation is satisfied.
- control sound is emitted in the direction indicated by the arrow with the force symbol R, the arrow direction with the symbol C, and the arrow direction with the symbol L for each speaker unit.
- the diffracted sound of the noise propagating from the front and the left and right directions with respect to the control point is reduced.
- the noise level above the predetermined sound pressure level for example, 70 dB
- the noise level above the specified sound pressure level «I continues for T [seconds] from Fig. 6 which shows an example of the sound pressure level of the noise at the control point.
- the vehicle travel speed is V [kmZ h]
- the control point The length L [m] of the control section that can reduce noise for P is as follows.
- an outside air temperature sensor 50 for detecting the outside air temperature is arranged, and a coefficient corrector 52 is provided in each control circuit, and each of the filter coefficients according to the outside air temperature is set in the coefficient corrector 52. This is to be corrected.
- Each coefficient corrector 52 stores in advance a correction coefficient for correcting the filter coefficient in accordance with the outside air temperature.
- the coefficient corrector 52 reads out the correction coefficient in accordance with the detected outside air temperature, and performs an inverse filter. The filter coefficient of is corrected.
- the outside air temperature sensor may be arranged for each group as a group of a plurality of control circuits that may be provided corresponding to each of the control circuits. One may be provided.
- the third embodiment is an inverse filter 32 adaptive filter.
- the present invention can also be applied to the case where the direct sound that propagates directly to the control point without being diffracted is reduced.
- the control sound is emitted in the direction in which the direct sound of the noise propagates or intersects the direct sound of the noise.
- the case where the control sound is emitted in three directions has been described.
- the case where a plurality of speaker units that allow the control sound to be emitted in two directions is provided is described. If the area to be reduced is small, one speaker unit and multiple microphones may be provided.
- the sound insulating plate 12 is horizontally attached to the inner wall surface on the upper side of the sound insulating wall 10, and the speaker unit 14 is attached to the substantially central portion of the upper surface of the sound insulating plate 12, micro
- control sound is emitted obliquely upward, which is suitable for reducing direct noise.
- one end of the sound insulation plate 12 is fixed to the upper side of the sound insulation wall 10, and the sound insulation plate 12 is horizontally mounted so as to protrude inside the sound insulation wall, and the speaker unit 14 is attached. Sound insulation 12
- the speaker unit is placed on the lower side of the soundproof wall away from the soundproof wall.
- one end of the sound insulating plate 12 is fixed to the upper side of the sound insulating wall 10, and the sound insulating plate 12 is horizontally mounted so as to protrude outside the sound insulating wall, and the speaker unit 14 is attached.
- the microphone 18 is disposed on the lower inner wall surface of the soundproof wall, and is attached to the edge of the top surface opposite to the fixed side to the soundproof wall 10.
- the microphone 18 is placed at a position away from the upper inner wall force of the soundproof wall.
- the speaker unit 14 is connected to the upper side of the soundproof wall without using a sound insulating plate.
- a microphone 18 is placed on the lower inner wall of the soundproof wall.
- the noise generated when a moving body such as a railroad moves or the noise generated by a stationary noise source is reduced. Can be done.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/016862 WO2006051602A1 (ja) | 2004-11-12 | 2004-11-12 | 騒音低減装置 |
US11/794,994 US20090041258A1 (en) | 2004-11-12 | 2004-11-12 | Noise reduction apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/016862 WO2006051602A1 (ja) | 2004-11-12 | 2004-11-12 | 騒音低減装置 |
Publications (1)
Publication Number | Publication Date |
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WO2006051602A1 true WO2006051602A1 (ja) | 2006-05-18 |
Family
ID=36336288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/016862 WO2006051602A1 (ja) | 2004-11-12 | 2004-11-12 | 騒音低減装置 |
Country Status (2)
Country | Link |
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US (1) | US20090041258A1 (ja) |
WO (1) | WO2006051602A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8027279B2 (en) * | 2007-09-17 | 2011-09-27 | Lantiq Deutschland Gmbh | Echo cancellation |
US9640169B2 (en) | 2015-06-25 | 2017-05-02 | Bose Corporation | Arraying speakers for a uniform driver field |
US9508336B1 (en) * | 2015-06-25 | 2016-11-29 | Bose Corporation | Transitioning between arrayed and in-phase speaker configurations for active noise reduction |
US10282166B2 (en) * | 2017-05-03 | 2019-05-07 | The Reverie Group, Llc | Enhanced control, customization, and/or security of a sound controlled device such as a voice controlled assistance device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06332478A (ja) * | 1993-05-26 | 1994-12-02 | Sanyo Electric Co Ltd | 電子消音方法 |
JPH08190388A (ja) * | 1994-11-11 | 1996-07-23 | Matsushita Electric Ind Co Ltd | 消音装置 |
JPH0934473A (ja) * | 1995-07-18 | 1997-02-07 | Shinko Electric Co Ltd | 消音装置 |
JPH10268873A (ja) * | 1997-03-26 | 1998-10-09 | Hitachi Ltd | 能動騒音制御装置付き防音壁 |
US5834647A (en) * | 1994-10-20 | 1998-11-10 | Comptoir De La Technologie | Active device for attenuating the sound intensity |
JPH11133981A (ja) * | 1997-10-24 | 1999-05-21 | Matsushita Electric Ind Co Ltd | 消音装置 |
JPH11215578A (ja) * | 1998-01-23 | 1999-08-06 | Sony Corp | パネル型スピーカ装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4815661B2 (ja) * | 2000-08-24 | 2011-11-16 | ソニー株式会社 | 信号処理装置及び信号処理方法 |
JP2004361938A (ja) * | 2003-05-15 | 2004-12-24 | Takenaka Komuten Co Ltd | 騒音低減装置 |
US20060285697A1 (en) * | 2005-06-17 | 2006-12-21 | Comfozone, Inc. | Open-air noise cancellation for diffraction control applications |
-
2004
- 2004-11-12 US US11/794,994 patent/US20090041258A1/en not_active Abandoned
- 2004-11-12 WO PCT/JP2004/016862 patent/WO2006051602A1/ja not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06332478A (ja) * | 1993-05-26 | 1994-12-02 | Sanyo Electric Co Ltd | 電子消音方法 |
US5834647A (en) * | 1994-10-20 | 1998-11-10 | Comptoir De La Technologie | Active device for attenuating the sound intensity |
JPH08190388A (ja) * | 1994-11-11 | 1996-07-23 | Matsushita Electric Ind Co Ltd | 消音装置 |
JPH0934473A (ja) * | 1995-07-18 | 1997-02-07 | Shinko Electric Co Ltd | 消音装置 |
JPH10268873A (ja) * | 1997-03-26 | 1998-10-09 | Hitachi Ltd | 能動騒音制御装置付き防音壁 |
JPH11133981A (ja) * | 1997-10-24 | 1999-05-21 | Matsushita Electric Ind Co Ltd | 消音装置 |
JPH11215578A (ja) * | 1998-01-23 | 1999-08-06 | Sony Corp | パネル型スピーカ装置 |
Also Published As
Publication number | Publication date |
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US20090041258A1 (en) | 2009-02-12 |
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