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
  • G10K11/17857—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

Definitions

• Active countersound system with special arrangement of the secondary actuators for reducing the passage of sound at an open boundary area of two volumes; active countersound arrangement; method for actively reducing sound waves; and use of an active countersound system for actively reducing sound waves for a control volume that is at least partly open
• the invention relates to an active countersound system for actively reducing sound waves of at least one primary sound wave emanating from a primary actuator that emits primary sound waves, with a special arrangement of secondary actuators to reduce sound wave passage at or through an open boundary area of two volumes. Moreover, the invention relates to an active countersound system arrangement, a method for actively reducing sound waves, and the use of an active countersound wave system for actively reducing sound waves for a control volume that is at least partly open.
• Sound waves in particular interfering sound waves such as noise, may be reduced either passively with noise-absorbing devices, or actively by means of active noise control (ANC) as it is generally known.
• ANC active noise control
• a known ANC system in principle functions as follows:
• a primary actuator such as for example a noise source, generates at least one primary sound wave such as for example a sinusoidal sound wave.
• this primary sound wave has to be superimposed by a secondary sound wave or countersound wave of at best the same amplitude and frequency but phase-shifted by 180°.
• an ANC regulator is provided. This regulator processes a reference signal that is synchronous in relation to the primary sound wave, which reference signal is for example acquired by means of a reference sensor, and an error signal that has been recorded by an error sensor, for example by an error microphone, and from this calculates a secondary signal with the frequency of the reference signal but with a different amplitude and phase.
• This secondary signal is conveyed to secondary actuators, for example loudspeakers, which convert the secondary signal to a countersound wave or countersound waves.
• the superimposed waves are then again acquired by the error sensor, and regulating or controlling is continued so as to achieve minimisation of the resulting sound wave.
• This object may be met by an active countersound system with a special arrangement of secondary actuators for reducing the passage of sound at an open boundary area of two volumes with the characteristics according to the independent claim 1; moreover the object of the present invention may be met by an active countersound system arrangement, a method for actively reducing sound waves, and the use of an active countersound system for actively reducing sound waves for a control volume that is at least partly open, with the characteristics according to the remaining independent claims.
• the active countersound system comprises at least one regulator unit, at least one error sensor, at least one reference sensor and one or several secondary actuators.
• the secondary actuators are designed to emit countersound waves.
• the error sensor which is coupled to the regulator unit, . acquires the superimposed sound waves and, if they are acquirable, conveys them as an error signal to the regulator unit by way of the coupling.
• the reference sensor which is coupled to the regulator unit, acquires the primary sound wave, of which there is at least one, and conveys a corresponding reference signal to the regulator unit by way of the coupling.
• the regulator unit which is coupled to the secondary actuators, processes the error signal and the reference signal and from them generates a secondary signal that is conveyed to the secondary actuators by way of the coupling so as to control the secondary actuators by means of the secondary signal, dependent on the error signal, such that said secondary actuators generate countersound waves that reduce the error signal so that optimum sound wave abatement may be achieved.
• the secondary actuators are arranged such that they are located on the margin of a passage area that is at least partly open, which passage area comprises a margin and is to be penetrated by the primary sound waves, in order to ensure active sound wave abatement of at least part of the space arranged behind the passage area, which space is at least partly open, of the countersound waves in the manner of a curtain.
• an active countersound arrangement with a control volume and with an active countersound system with the above-described characteristics is created for actively reducing sound waves of the primary sound waves in the control volume.
• a reference sensor In the method according to the invention for active abatement of sound waves of at least one primary sound wave emanating from a primary actuator that emits primary sound waves, by means of a reference sensor a reference signal of a primary sound wave is acquired. Furthermore, by means of an error sensor an error signal is acquired by superimposed sound waves. By means of couplings the error signal and the reference signal are transmitted to a regulator unit. Furthermore, the regulator unit evaluates the transmitted signals, and a secondary signal is generated. The secondary signal is transmitted by means of coupling to secondary actuators.
• the secondary actuators are arranged on the margin of an open passage area for the primary sound waves.
• secondary waves are generated from the transmitted secondary signal, which secondary waves in the manner of a curtain are superimposed on the open passage area so that the primary sound wave that propagates through the open passage area is at least reduced and/or eliminated, wherein the steps are repeated and/or continuously carried out in the active countersound system that is designed as a control circuit.
• an active countersound system for actively reducing sound waves in an at least partly open control volume.
• a fundamental idea of the invention comprises the fitting of an active countersound system with secondary actuators, wherein the secondary actuators are arranged such that they are arranged so as to be marginal, i.e. along the margin of an open passage area for primary sound waves, and so that they generate secondary sound waves or countersound waves that in the open passage area are superimposed on the primary sound waves, thus reducing or eliminating the primary sound waves.
• the secondary actuators are arranged such that they are arranged so as to be marginal, i.e. along the margin of an open passage area for primary sound waves, and so that they generate secondary sound waves or countersound waves that in the open passage area are superimposed on the primary sound waves, thus reducing or eliminating the primary sound waves.
• a kind of "acoustic curtain" may be created through which all primary sound waves in their direction of propagation behind the passage area may at least be reduced.
• primary waves are noise waves. Accordingly, secondary waves or countersound waves are corresponding (phase-shifted) noise waves. Correspondingly, secondary actuators for generating these noise waves are loudspeakers.
• An open passage area is an area surrounded by a closed margin, through which area the primary sound wave(s) reache(s) the space or the control volume.
• the margin can have any closed geometric shape.
• the margin may be arranged in one plane.
• the margin can be designed as a circumference of a simple geometric figure comprising triangles, circles, ovals, ellipses, quadrangles, polygons, squares, rectangles, trapeziums, lozenge shapes or the like.
• the margin can also be designed as a so-called envelope so that encapsulation of a primary actuator that is designed as a noise source can be achieved. In this way the entire surroundings behind this envelope would undergo primary sound wave reduction.
• the secondary actuators are preferably arranged so as to be equidistant along the margin of the passage area. In this way, optimum primary sound wave reduction can be achieved. Equidistant distribution along the margin makes it possible to design simpler computing models with simpler algorithms for regulating or controlling the active countersound system, thus ensuring more effective primary sound wave reduction.
• the number of secondary actuators for effective primary sound wave reduction depends on a multitude of parameters comprising the geometry of the space to be shielded, or on the control volume, geometry of the passage area, spectral composition of the primary sound wave(s), amplitude and/or frequency of the primary sound wave(s), bandwidth of the primary sound wave(s), degree of the desired sound wave reduction and the like.
• space to be shielded refers to the space or the control volume in which active (primary) sound wave reduction is to take place.
• the type of secondary actuators depends on many parameters comprising the geometry of the space to be shielded or the control volume, geometry of the passage area, spectral composition of the primary sound wave(s), amplitude and/or frequency of the primary sound wave(s), bandwidth of the primary sound wave(s), degree of the desired sound wave reduction and the like.
• the position of the error sensors may have an influence on the effectiveness of the active countersound system.
• the number and/or type of error sensors also depends on parameters such as the geometry of the space to be shielded, the control volume, geometry of the passage area, spectral composition of the primary sound wave(s), amplitude and/or frequency of the primary sound wave(s), degree of the desired sound wave abatement and the like.
• the reference sensor and the error sensor may be designed so as to be integrated in one sensor. In this way both so-called feedforward systems and feedback systems can be designed.
• said reference signal can also be obtained from the error sensors and reference sensors that have been combined and integrated in one sensor.
• the active countersound system with the special marginal arrangement of the secondary actuators for actively reducing sound waves for an at least partly open control volume, is manifold.
• the active countersound system can be arranged in entrance regions of noise-attenuated spaces in order to achieve effective noise reduction.
• primary actuators designed as noise sources can effectively be encapsulated with this system.
• certain areas in which for example due to legal requirements noise reduction is mandatory, can be effectively protected against the effects of noise, without the need to meet noise protection measures for the entire workshop hall.
• the use of the arrangement according to the invention is associated with an advantage in that said arrangement does not visually block out the open passage area, as is for example the case in passive noise protection barriers.
• the use as a noise protection barrier or noise protection barrier element may also provide an advantage in that essentially only the acoustic perception is altered.
• the arrangement of the secondary actuators or of the margin of the open passage area is designed as a simple geometric figure. In this way several of these arrangements can be arranged together in a modular way, also in order to generate large-area noise protection.
• the figure shows an in-principle diagram of an active countersound system according to the invention.
• the active countersound system arrangement 30 comprises an active countersound system 10 and a control volume 20.
• the active countersound system 10 comprises a regulator unit 11, two error sensors 12, a reference sensor 13 and four secondary actuators 14.
• the secondary actuators 14 are designed as loudspeakers with which countersound waves 15 can be generated. These countersound waves 15 are sinusoidal sound waves and are acquired by means of the two error sensors 12, which in the present embodiment are correspondingly designed as microphones.
• the error sensors 12 are coupled to the regulator unit 11 by means of lines. By way of this line the error signal F acquired by the error sensors 12 is transmitted to the regulator unit 11.
• a primary sound wave 16, generated by a primary actuator (not shown) is acquired by the reference sensor 13 as a reference signal R.
• the primary sound wave 16 is shown in the shape of a sinusoidal noise wave or sound wave.
• the reference sensor 13 is a microphone.
• the reference sensor is also coupled to the regulator unit 11 by way of a coupling designed as a line. By way of this line the reference signal R is transmitted to the regulator unit 11.
• the regulator unit 11 evaluates the two transmitted signals R, F and from them calculates a secondary signal S.
• the regulator unit 11 is coupled to the secondary actuators 14 by way of lines.
• the secondary signal S generated by the regulator unit is transmitted from the regulator unit 11 to the secondary actuators 14.
• the secondary actuators 14 convert the secondary signal S to countersound waves 15 onto which the primary sound wave 16 is superimposed. This superimposed sound wave or these superimposed sound waves is/are again acquired by the error sensors 12, and regulating is continuously carried out or repeated.
• the control volume 20 is designed as a partly open control volume, which in the figure is diagrammatically illustrated as a right parallelepiped whose one side is designed as an open passage area 21. Through this open passage area 21 the primary sound wave 16, or the primary sound wave 16' or sound waves onto which the countersound wave(s) has/have been superimposed, or which primary sound wave 16' has been attenuated by the countersound wave(s), reaches/reach the interior of the control volume 20.
• the open passage area 21 is surrounded by a margin. Along this margin, which in the embodiment shown is rectangular in shape, the secondary actuators 14 are arranged. In this arrangement the secondary actuators 14 are spaced apart from each other so as to be equidistant.
• the countersound waves 15 emitted by the secondary actuators 14 along the open passage area 21 form a type of "acoustic curtain" so that no primary sound wave 16 can pass the open passage area 21 towards the interior of the control volume 20 without these countersound waves 15 being superimposed on it.
• the superimposition generates an attenuated primary sound wave 16', wherein the degree of attenuation is to be equated with the reduction in noise or reduction in the primary sound wave.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)
• Curtains And Furnishings For Windows Or Doors (AREA)
• Power-Operated Mechanisms For Wings (AREA)
• Pinball Game Machines (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=37026258

Family Applications (1)

Country Status (8)

Families Citing this family (17)

Family Cites Families (13)

• 2005
  • 2005-04-07 DE DE102005016021A patent/DE102005016021A1/de not_active Ceased
• 2006
  • 2006-04-05 CN CNA2006800098037A patent/CN101147189A/zh active Pending
  • 2006-04-05 WO PCT/EP2006/003092 patent/WO2006105948A2/en active Application Filing
  • 2006-04-05 EP EP06724041A patent/EP1866908A2/en not_active Withdrawn
  • 2006-04-05 JP JP2008504679A patent/JP2008537166A/ja active Pending
  • 2006-04-05 CA CA002597636A patent/CA2597636A1/en not_active Abandoned
  • 2006-04-05 RU RU2007139146/28A patent/RU2411592C2/ru not_active IP Right Cessation
  • 2006-04-05 US US11/908,383 patent/US20080196967A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events