EP1941491A1 - Method and device for actively correcting acoustic properties of an acoustic space listening zone - Google Patents
Method and device for actively correcting acoustic properties of an acoustic space listening zoneInfo
- Publication number
- EP1941491A1 EP1941491A1 EP06808279A EP06808279A EP1941491A1 EP 1941491 A1 EP1941491 A1 EP 1941491A1 EP 06808279 A EP06808279 A EP 06808279A EP 06808279 A EP06808279 A EP 06808279A EP 1941491 A1 EP1941491 A1 EP 1941491A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- sound
- resonances
- sound signal
- disturbed
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
- H04S7/30—Control circuits for electronic adaptation of the sound field
- H04S7/301—Automatic calibration of stereophonic sound system, e.g. with test 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
- 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
- G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
- G10K11/17833—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
-
- 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
-
- 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
Definitions
- the invention relates to a method and a device for actively correcting the acoustic properties of a listening area of a sound space.
- listening area is meant a reduced volume of the sound space in which one or more listeners are likely to be placed to listen to a sound signal.
- a sound reproduction facility that has been designed to operate in a given environment may have a strongly modified behavior when used in an environment that deviates from that for which it was designed.
- This problem is very frequently encountered in the case of audio reproduction installations such as Hi-Fi systems and more particularly when they are used in small premises such as living rooms, whose current dimensions lead to annoying resonances. at low frequencies (especially the first clean modes of the room).
- the reflections of sound waves on the walls of the room combine to form areas of strong (+) and low (-) pressures distributed spatially in the room, as shown in Figure 2. Different distributions of the zones of strong (+) and low (-) pressures are possible. These distributions are characteristic of the room. They each correspond to an acoustic mode that resonates at a specific frequency.
- Resonance means a mode of transmission of sound waves activated by the multiple reflections of these waves on the walls of the sound space, producing a spatial distribution of the pressure in the sound space disturbing the sound reproduction in the listening area .
- the processing correction of the reproducing signal is in the first category. It is by far the most widespread. It can be performed by tonal balance corrections (bass / treble adjustment, graphic equalizer), finer frequency corrections (parametric equalizer), or by specific treatments (digital filtering system adjusted via the measurement of the response in one or more listening points).
- tonal balance corrections basic / treble adjustment, graphic equalizer
- finer frequency corrections finer frequency corrections
- specific treatments digital filtering system adjusted via the measurement of the response in one or more listening points.
- the method of correction by processing of the reproducing signal is also limited for a correction of the fine signal which becomes very sensitive to variations in the sound environment.
- the second category of solutions (correction of the acoustic environment) to limit the influence of the sound reproduction environment is easy to implement. It is therefore not widespread.
- the most conventional method is to perform a passive acoustic treatment when it is a listening room or a show venue. The correction must be done in the whole volume, even if the reproduction concerns only a reduced listening area.
- Patents FR 2 766 953 and US 4 122 303 which disclose this approach to reduce noise.
- Patents EP 1 088 298 and EP 0 555 787 disclose a device which makes it possible to modify the acoustic characteristics of an auditory space.
- the object of the present invention is to propose a method and a device for actively correcting the acoustic properties of a listening zone of a more effective sound space, aiming to obtain a better homogeneity of the sound signal in a space. reduced.
- the invention makes it possible to correct what can not be corrected by other approaches, with a complexity of implementation and a reduced cost.
- the invention relates to a method of actively correcting the acoustic properties of a listening area of a sound space comprising:
- a step of attenuation of the resonances comprising:
- the step of measuring the disturbed sound signal comprises several predetermined measurement positions in the space sound so as to measure amplitudes of resonances close to those of the resonances disturbing the reproduction of the primary sound signal in the listening zone,
- the second sound signal attenuating the resonances is reproduced in several predetermined correction positions in the sound space so as to act in the opposite direction on said resonances making it possible to obtain a homogeneous corrected sound signal in the listening zone,
- the step of attenuation of the resonances is coupled with a step of processing the signal to be reproduced so as to allow the production of a modified sound signal able to cancel the formation of the resonances,
- the step of processing the electrical signal takes into account all the disturbed sound signals measured at the different measurement positions 5.
- the present invention also relates to features which will be apparent from the following description and which will have to be considered in isolation or in all their technically possible combinations:
- the processing of the signal to be reproduced is an equalization signal processing
- the processing of the electrical signal and the processing of the signal to be reproduced use the signal to be reproduced as a reference
- the step of processing the electrical signal comprises a step of assigning coefficients weighting said coefficients according to the position of measurements.
- the invention also relates to an active correction device for the acoustic properties of a listening area of a sound space comprising:
- a resonance attenuation means comprising:
- At least one means for measuring the disturbed sound signal said disturbed sound signal being converted into an electrical signal
- a means of processing the electrical signal enabling the formation of a processed electrical signal
- At least one secondary sound reproduction source converting said processed electrical signal into a secondary sound signal capable of attenuating said resonances in order to obtain a corrected sound signal.
- the measuring means of the disturbed sound signal are distributed in several predetermined measurement positions in the sound space so as to measure amplitudes of resonances close to those of the resonances disturbing the reproduction of the sound signal first in the listening zone;
- the second sound reproducing sources converting said processed electrical signal into a secondary sound signal are distributed in several predetermined correction positions in the sound space so as to act in opposite directions on said resonances making it possible to obtain a corrected sound signal. homogeneous in the listening area
- the resonance attenuation means is coupled with a signal processing means reproduced so as to allow the production of a modified sound signal capable of minimizing the formation of resonances,
- the means for processing the electrical signal 6 comprises at least one signal control means 7 connected to each measurement means of the disturbed sound signal 1 5.
- the present invention also relates to the features which will be apparent from the following description and which should be considered in isolation or in all their technically possible combinations:
- the signal processing means to be reproduced is an equalization signal processing means
- the resonance attenuation means and the signal processing means to be reproduced use the signal to be reproduced as a reference
- the signal control means comprises means for assigning coefficients weighting said coefficients according to the position of measurements
- each means of signal control means comprises a single channel connected to a secondary sound reproduction source, said second sound reproducing source converting the processed electrical signal into a secondary sound signal attenuating at least one resonance,
- the signal control means comprises a control filter
- control filter is an adaptive filter
- the measuring means of the disturbed sound signal are arranged in the listening zone,
- the measuring means of the disturbed sound signal are arranged at the periphery of the sound space.
- FIG. 1 represents an example of an active correction device for the acoustic properties of a sound space according to the prior art
- FIG. 2 is a schematic representation of an active correction device for the acoustic properties of a sound space correcting, for example, the two acoustic modes (2, 2) A) and (1, 0) B) present in a listening area, according to one embodiment of the invention;
- FIG. 3 is a more detailed schematic representation of the device for the active correction of properties acoustics of a sound space according to one embodiment of the invention
- FIG. 4 is a schematic representation of a means for processing the electrical signal
- FIG. 1 represents a device for actively correcting the acoustic properties of a sound space according to the prior art.
- This device is set up in a sound space 1, usually small as a living room. It comprises a means of reproducing a sound signal having 2, 4 comprising a reproduction unit of a primary sound signal 2 associated with at least two sources of reproduction of a primary sound signal. 2, 4 may consist of a home Hi-Fi system equipped with two speakers.
- the two sources of reproduction of a primary sound signal 4 and the listening area 27 are advantageously arranged in a stereo triangle in the sound space 1 as recommended by the manufacturers.
- the reproducing means 2, 4 converts the reproducing signal to produce a primary sound signal.
- the signal to be reproduced is an electrical signal from a pre-recording on a compact disc for example.
- the primary sound signal causes resonances in the sound space 1.
- the superimposition of the sound signal with the resonances forms a disturbed sound signal.
- a means of attenuation of the resonances makes it possible to limit the influence of the sound space 1 on the reproduction of the sound.
- This means is commonly called active acoustic correction device of the sound environment.
- It comprises at least one measuring means 1 5 of the disturbed sound signal which may be a microphone or a pressure sensor for example.
- the disturbed sound signal is converted into an electrical signal 32, processed by an electrical signal processing means 6.
- a processed electrical signal 9 is obtained.
- At least one second sound reproduction source 8 converts the processed electrical signal 9 into a second sound signal exciting the resonances so as to attenuate them and to obtain a corrected sound signal.
- the sources of secondary sound reproduction 8 may be for example loudspeakers.
- the resonances of the disturbed sound signal couple with the amplitudes of the secondary sound signal. This results in a corrected sound signal with fewer resonances. Nevertheless, the listener does not perceive the same corrected sound signal in all points of the sound space 1.
- the spatial and therefore frequency distribution of the corrected sound signal are not homogeneous.
- Figures 2 and 3 show an example of active correction device of the sound environment according to the invention.
- the resonant attenuation means is coupled to a signal processing means 3 to be reproduced.
- the signal processing means 3 reproduces a modified sound signal capable of suppressing the formation of the resonances.
- the signal processing to be reproduced may be a signal processing to be reproduced by equalization for example.
- the processing of the signal to be reproduced makes it possible to perform a signal processing before it is reproduced by the sound reproduction sources 4.
- the resonant attenuation means and the reproducing signal processing means 3 use the signal to be reproduced as reference 31.
- the measuring means 1 5 are distributed in more than 5 predetermined measurement positions in the sound space 1 so as to allow the detection of all the resonances and more precisely of all the first eigen modes of the sound space 1 hindering the sound reproduction in the listening area 27.
- the means for measuring the disturbed sound signal 1 5 can be arranged at positions where the amplitudes produced by the resonances are identical to those present in the listening area 27.
- the means for measuring the disturbed sound signal 1 5 can be arranged in the listening area 27.
- the measuring means 1 5 measure at least one of the parameters of au me ns one of the first eigen modes of the sound space 1.
- the measured parameter can be the high amplitude gain.
- the gain can be represented by a matrix defined by two i ndices, one is dedicated to a measurement position 5 and the other to a clean mode.
- the measuring means 1 5 can be arranged along the walls of the sound space 1, approximately every 50 cm for example.
- the measuring means 1 5 may be remote from the listening area 27.
- FIG. 2 gives an example of positioning of the measuring means which are installed in predefined positions. These positions 5 are predefined by a prior reading of the amplitudes produced by the troublesome resonances in the listening area 27.
- two modes are represented, the mode (2.2) (FIG. 2A) and the mode (FIG. 1, 0) ( Figure 2B). They give rise to two different pressure distributions in the space. Areas of high pressure are separated by low pressure zones 21.
- the measuring means 15 are then placed at the positions which have the same zones of high pressure as the listening zone 27.
- the measurement means 1 5 are connected to a means for processing the electrical signal 6. More specifically, each measurement means of the disturbed signal 1 5 is connected to the signal signal control means 7 of the electrical signal processing means 6.
- the electrical signal processing step takes into account all the disturbed sound signals measured at the different measurement positions 5. This implies that the signal control means 7 is multichannel and that the processing of the signal electrical signal is matrix.
- Each secondary sound signal 9 at the output of each signal control means 7 depends on all the disturbed audible signals measured. In other words, all outputs depend on all inputs.
- Each signal control means 7 processes one or more resonances (modes) at a time.
- Each signal control means 7, shown in FIG. 4, comprises a coefficient assignment means 1 0 corresponding to each position of a measurement means of the disturbed sound signal 5.
- Coefficients are attributed to gains, for example, and are weighted according to the position of measures 5.
- the coefficient is weighted according to the influence of this mode on the primary sound signal at the measurement position 5.
- the amplitudes of the gains are then summed in a summation means 1 1 so as to obtain an error signal 29.
- the error signal 29 and the reference signal 31 are filtered by a filter 12 and 30 respectively so as to isolate the neighboring frequencies of the resonance frequency considered.
- the processing of the electrical signal comprises a step of combining the disturbed sound signals measured by the measuring means of the disturbed signal 1 5. This step consists in systematically making a difference between the weighted inputs, it is between the disturbed sound signals measured and weighted by the coefficient allocation means 1 0.
- the signal control means 7 of Figure 4 which comprises three inputs each assigned to a measured disturbed sound signal. These entries are numbered e1, e2 and e3. A difference is made between the disturbed measured and weighted sound signals. The following difference signals are obtained: e1-e2, e2-e3 and e3-e1. These difference signals correspond in fact to pressure differences between the different measurement positions 5. These difference signals are then summed by the summation means 11 so as to obtain the error signal 29.
- This combination step improves the performance of the correction device because the difference signals are more characteristic of the resonances than the pressures alone.
- both the difference signals and the measured and weighted disturbed sound signals are used in the electrical signal processing step.
- the signal control means 7 the proportion of these two types of signals to be considered in the step of processing the electrical signal is determined.
- a control filter 13 comprising an algorithm makes it possible to obtain at its output a processed electrical signal 9 which is then amplified by an amplifier 14 before being converted into a secondary sound signal by the loudspeaker 8.
- the secondary sound signal has amplitudes in phase opposition with respect to those of the resonances.
- the parameters of the algorithm can be determined beforehand during the installation of the device for the active correction of the acoustic properties in the sound space 1.
- an adaptive control filter 13 uses, for example, an LMS (Least Mean Squares) type algorithm.
- LMS Least Mean Squares
- the signal control means 7 In view of the inevitable fluctuations of the acoustic environment to be corrected, the signal control means 7 must adapt to it in real time.
- Each signal control means 7 comprises a channel 16 connected to a secondary source 8.
- Each channel can handle multiple modes at once.
- the correction positions 17 are predetermined so that the amplitudes produced by the secondary sources 8 allow a good coupling with the modes to be processed while limiting the coupling with the other modes in the listening area 27.
- the frequency density and depreciation is then regulated.
- the effects obtained are a better homogeneity of the frequency and spatial responses in the listening area 27, and a shorter time response. This approach consists in making a spatial correction to obtain a frequency correction.
- the secondary sources 8 can be placed in the spaces of the sound space 1.
- the correction is performed in a reduced portion of the space corresponding to the position of one or more listeners and more precisely to the ears of listeners. They can be distant from the sources of primary sound reproduction 4. Their position is chosen so that they excite troublesome resonances.
- the primary sound reproduction sources 4 are used to attenuate annoying resonances.
- the method and the device for the active correction of the proposed acoustic properties make it possible to obtain a more effective sound reproduction in a listening zone 27 thanks to a better distribution of the pressure in this listening zone 27, resulting in a better distribution. frequency of sound waves.
- This process is based on a modal approach. We try to treat all the modes at the same time.
- the invention makes it possible to correct that which can not be corrected by other approaches, with a complexity of implementation and a reduced cost.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0552676A FR2890480B1 (en) | 2005-09-05 | 2005-09-05 | METHOD AND DEVICE FOR ACTIVE CORRECTION OF THE ACOUSTIC PROPERTIES OF A LISTENING AREA OF A SOUND SPACE |
PCT/FR2006/050840 WO2007028922A1 (en) | 2005-09-05 | 2006-09-04 | Method and device for actively correcting acoustic properties of an acoustic space listening zone |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1941491A1 true EP1941491A1 (en) | 2008-07-09 |
EP1941491B1 EP1941491B1 (en) | 2013-01-02 |
Family
ID=36499460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06808279A Not-in-force EP1941491B1 (en) | 2005-09-05 | 2006-09-04 | Method and device for actively correcting acoustic properties of an acoustic space listening zone |
Country Status (6)
Country | Link |
---|---|
US (1) | US8059822B2 (en) |
EP (1) | EP1941491B1 (en) |
JP (1) | JP5020243B2 (en) |
CA (1) | CA2621553C (en) |
FR (1) | FR2890480B1 (en) |
WO (1) | WO2007028922A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5262324B2 (en) | 2008-06-11 | 2013-08-14 | ヤマハ株式会社 | Speech synthesis apparatus and program |
FR2984064B1 (en) * | 2011-12-13 | 2016-07-22 | Anagram Acoustics | SOUND REPRODUCTION DEVICE AND METHOD FOR LOW FREQUENCIES |
CN113554998B (en) * | 2020-04-24 | 2023-11-10 | 广东美的白色家电技术创新中心有限公司 | Active noise reduction device, indoor electrical system and active noise reduction method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4122303A (en) * | 1976-12-10 | 1978-10-24 | Sound Attenuators Limited | Improvements in and relating to active sound attenuation |
JPH0195699A (en) * | 1987-10-08 | 1989-04-13 | Ono Sokki Co Ltd | Sound pressure control system |
NL8800745A (en) * | 1988-03-24 | 1989-10-16 | Augustinus Johannes Berkhout | METHOD AND APPARATUS FOR CREATING A VARIABLE ACOUSTICS IN A ROOM |
ATE120328T1 (en) * | 1988-07-08 | 1995-04-15 | Adaptive Audio Ltd | SOUND REPRODUCTION SYSTEMS. |
JPH02150197A (en) * | 1988-11-30 | 1990-06-08 | Onkyo Corp | Standing wave suppressing device |
US4899387A (en) * | 1988-12-02 | 1990-02-06 | Threshold Corporation | Active low frequency acoustic resonance suppressor |
US5537479A (en) * | 1994-04-29 | 1996-07-16 | Miller And Kreisel Sound Corp. | Dual-driver bass speaker with acoustic reduction of out-of-phase and electronic reduction of in-phase distortion harmonics |
JP3421146B2 (en) * | 1994-10-28 | 2003-06-30 | アルパイン株式会社 | Sound field control method and device |
JP3539855B2 (en) * | 1997-12-03 | 2004-07-07 | アルパイン株式会社 | Sound field control device |
FI981409A (en) * | 1998-06-17 | 1999-12-18 | Genelec Oy | Method and apparatus for reducing acoustic reflection in a room |
FR2817648B1 (en) * | 2000-12-04 | 2005-02-18 | Xavier Jacques Marie Meynial | ACTIVE SOUND REFLECTOR |
US7715575B1 (en) * | 2005-02-28 | 2010-05-11 | Texas Instruments Incorporated | Room impulse response |
-
2005
- 2005-09-05 FR FR0552676A patent/FR2890480B1/en not_active Expired - Fee Related
-
2006
- 2006-09-04 EP EP06808279A patent/EP1941491B1/en not_active Not-in-force
- 2006-09-04 JP JP2008528565A patent/JP5020243B2/en not_active Expired - Fee Related
- 2006-09-04 CA CA2621553A patent/CA2621553C/en not_active Expired - Fee Related
- 2006-09-04 WO PCT/FR2006/050840 patent/WO2007028922A1/en active Application Filing
- 2006-09-04 US US12/065,610 patent/US8059822B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2007028922A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007028922A1 (en) | 2007-03-15 |
FR2890480B1 (en) | 2008-03-14 |
JP5020243B2 (en) | 2012-09-05 |
JP2009507254A (en) | 2009-02-19 |
EP1941491B1 (en) | 2013-01-02 |
FR2890480A1 (en) | 2007-03-09 |
US8059822B2 (en) | 2011-11-15 |
US20080247552A1 (en) | 2008-10-09 |
CA2621553A1 (en) | 2007-03-15 |
CA2621553C (en) | 2014-01-07 |
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