EP1652406A1 - SYSTEME ET PROCEDE DE DETERMINATION D UNE REPRESENTATION D&a pos;UN CHAMP ACOUSTIQUE - Google Patents
SYSTEME ET PROCEDE DE DETERMINATION D UNE REPRESENTATION D&a pos;UN CHAMP ACOUSTIQUEInfo
- Publication number
- EP1652406A1 EP1652406A1 EP04767818A EP04767818A EP1652406A1 EP 1652406 A1 EP1652406 A1 EP 1652406A1 EP 04767818 A EP04767818 A EP 04767818A EP 04767818 A EP04767818 A EP 04767818A EP 1652406 A1 EP1652406 A1 EP 1652406A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acoustic
- regular
- signals
- distributed
- sensors
- 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
- 238000000034 method Methods 0.000 title claims description 34
- 238000001914 filtration Methods 0.000 claims abstract description 34
- 238000005259 measurement Methods 0.000 claims description 30
- 239000011159 matrix material Substances 0.000 claims description 25
- 238000010586 diagram Methods 0.000 claims description 5
- 238000009877 rendering Methods 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 230000001788 irregular Effects 0.000 claims description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
- H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S3/00—Systems employing more than two channels, e.g. quadraphonic
- H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
Definitions
- the present invention relates to a method, a device and a system for determining a representation of an acoustic field in the form of a plurality of acoustic or audiophonic signals, each associated with a predetermined general direction of restitution defined with respect to at a given point in space.
- the determination of such a representation is based on the use of acoustic wave acquisition means comprising a plurality of elementary sensors arranged in space and each delivering a measurement signal.
- These measurement signals are processed by the application of filtering combinations, representative in particular of structural characteristics of the acquisition means and general predetermined restitution directions, so as to obtain said plurality of acoustic signals.
- Such a plurality of signals is commonly designated by the expression “multichannel signal” and corresponds to a plurality of signals, called “channels”, transmitted in parallel or multiplexed with each other.
- Each of the signals is intended for an element or a group of restitution elements forming an ideal source arranged in a general direction predefined with respect to a given point in space.
- a conventional multichannel standard known as "5.1 ITU-R BF 775-1” comprises five channels intended for rendering elements arranged in five predetermined general directions defined by the angles 0 °, + 30 °, - 30 °, + 110 ° and -110 ° relative to the listening center.
- Such an arrangement therefore corresponds to the arrangement: of a loudspeaker or a group of loudspeakers in front of the center, one on each side in front on the left and on the right and one on each side behind on the left and on the right.
- the application of the acoustic signals to restitution elements arranged according to the appropriate predetermined general directions theoretically allows the restitution of an acoustic field.
- the acquisition and processing constitute key elements of the quality of this restitution.
- Certain existing acquisition means are formed by a set of elementary directional sensors where each sensor directly delivers a channel corresponding to one of the predetermined general directions of restitution. In this case, each sensor is substantially oriented in the direction corresponding to its associated channel.
- the quality of the representation obtained with such acquisition means is limited by the intrinsic directivity of the sensors, since no processing is carried out, so that the representation is not a high quality representation.
- Other techniques such as the techniques grouped under the term "ambisonic" are based on a modeling of the acquisition means in the form of a point set of elementary and directional sensors, so as to consider only the directions of provenance sounds relative to the center of the acquisition means.
- the impossibility of positioning all the elementary sensors at the same point, the absence of elementary sensors with high directivity characteristics as well as the simplicity of the treatments carried out, such as gain matrices restrict these technologies to a representation.
- the quality of which is limited to the level of precision commonly known as "order 1" based on spherical harmonics.
- the subject of the invention is a system for determining a representation of an acoustic field of the type comprising: - means for acquiring acoustic waves comprising a plurality of elementary sensors distributed in space, and each delivering a measurement signal; and - processing means by applying, to said measurement signals, filtering combinations representative of structural characteristics of said acquisition means to deliver a plurality of acoustic signals each associated with a general direction of predetermined restitution defined with respect to a given point in space, all of said acoustic signals forming a representation of said acoustic field, characterized in that said elementary sensors are distributed in space in a substantially non-regular manner and in that said filtering combinations are representative of this distribution.
- - said acquisition means are such that, for all the usual benchmarks, for at least one of the coordinates of the benchmark, the values of the coordinates of the positions of all the elementary sensors are distributed on distinct values and at not constant; - Said acquisition means comprise at least one omnidirectional elementary sensor; - said acquisition means comprise at least one elementary sensor whose directivity is a combination of omnidirectional and bidirectional diagrams.
- - Said acquisition means comprise a number of elementary sensors between one and five times the number of predetermined restitution general directions;
- processing means comprise a single matrix filtering stage receiving as input said measurement signals and delivering as output said plurality of acoustic signals;
- processing means form weighted linear combinations of said measurement signals in order to form said acoustic output signals; said processing means allow the application of filtering combinations varying with the frequency of said processed measurement signals.
- the subject of the invention is also a device for determining a representation of an acoustic field comprising means for processing the signals delivered by means of acquisition of acoustic waves comprising a plurality of elementary sensors distributed in space, by applying filtering combinations representative of structural characteristics of said acquisition means to deliver a plurality of acoustic signals each associated with a predetermined general direction of restitution defined with respect to a given point in space, said acoustic signals forming a representation of said acoustic field, characterized in that said processing means are suitable for processing signals delivered by acquisition means formed by sensors distributed in space in a substantially non-regular manner.
- Another subject of the invention is also a method of determining a representation of an acoustic field, characterized in that it comprises: - a step of acquisition at a plurality of points distributed in space so substantially non-regular of said acoustic field by means of acquisition of acoustic waves, in order to deliver a plurality of measurement signals representative at each point, in amplitude and in phase, of said acoustic field; a processing step by applying, to said measurement signals, filtering combinations representative of structural characteristics of said acquisition means to deliver a plurality of acoustic signals each associated with a general predetermined restitution direction defined with respect to a point given space, the set of said acoustic signals forming a representation of said acoustic field.
- - said processing step corresponds to: the application to said measurement signals of combinations of filterings to generate a plurality of processed signals constituting a representation of said acoustic field substantially independent of the structural characteristics of the acquisition means, in the form of a finite number of Fourier coefficients -Bessel; and - applying specific linear combinations to said processed signals to generate said corresponding plurality of acoustic signals;
- - said processing step corresponds to the application of filtering combinations according to a technique selected from the group formed: - filtering techniques in the frequency domain; - filtering techniques in the time domain by impulse response; and - filtering techniques in the time domain by means of recursive filters with infinite impulse response.
- the subject of the invention is also a method of verifying the non-regular character of a network of elementary sensors, characterized in that it consists in: - considering the network in a first usual reference; - to check the values of the positions of all the sensors according to a first coordinate of said reference; - If the values of said first coordinates are neither constant, nor distributed at regular intervals, the network is said to be non-regular in the current coordinate system and the process is repeated in another coordinate system; - If the values of said first coordinates are either constant or distributed at regular intervals, the values of the positions of the sensors are checked according to a second coordinate of said coordinate system; - if the values of said second coordinates are neither constant, nor distributed at regular intervals, the network is non-regular in the current reference frame and the process is repeated with another reference frame; - If the values of said second coordinates are either constant or distributed at regular intervals, the values of the positions of the sensors are checked according to a third coordinate of said coordinate system; - If the values of said third
- FIG. 1 is a representation of a spherical coordinate system
- - Fig.2 is a block diagram of a rendering system according to the invention
- - Fig.3 is a flow diagram of the method of the invention
- - Fig.4 is a detailed representation of the processing performed by the invention.
- a conventional spherical coordinate system has been represented, so as to specify the coordinate system to which reference is made in the text.
- This coordinate system is an orthonormal coordinate system, of O origin and comprising three axes (OX), (OY) and (OZ).
- a position denoted x is described by means of its spherical coordinates (r, ⁇ , ⁇ ), where r denotes the distance from the origin O, ⁇ orientation in the vertical plane and ⁇ orientation in the horizontal plane.
- r denotes the distance from the origin O
- ⁇ orientation in the vertical plane and ⁇ orientation in the horizontal plane.
- an acoustic field is known if we define at all points at each instant t the acoustic pressure noted p (r, ⁇ , ⁇ , t), whose Fourier transform is noted P (r, ⁇ , ⁇ , f) where / designates the frequency.
- the method of the invention is based on the use of spatiotemporal functions making it possible to describe any sound field in time and in the three dimensions of space.
- these functions are so-called spherical Fourier-Bessel functions of the first kind, hereinafter called Fourier-Bessel functions.
- Fourier-Bessel functions correspond to the solutions of the wave equation and constitute a base which generates all the acoustic fields produced by sources located outside this zone.
- air (340 ms "1 ), j) (kr) is the spherical Bessel function of the first kind
- J v (x) is the Bessel function of pre- first species of order v
- yf ( ⁇ , ⁇ ) is the real spherical harmonic of order / and of term m, with m going from - / to /, defined by: with:
- the Fourier-Bessel coefficients are also expressed in the time domain by the coefficients p ⁇ , m (t) corresponding to the inverse temporal Fourier transform of the coefficients P ⁇ , m (f).
- the acoustic field is broken down on the basis of functions, where each of the functions is expressed by a possibly infinite linear combination of Fourier-Bessel functions.
- Figure 2 there is shown schematically a system according to the invention.
- This system comprises acquisition means 1 formed by Q elementary sensors 2 ⁇ to 2Q delivering measurement signals c ⁇ (t) to c Q (t), also noted here to CQ, which are introduced into a device 6 of determination of a representation of an acoustic field.
- the device 6 comprises processing means 8 adapted to apply to the measurement signals Ci to CQ filtering combinations representative of the structural characteristics of the acquisition means 1, to deliver as output a plurality of acoustic signals each associated with a direction general predetermined. of restitution defined with respect to a given point in space.
- Acoustic signals sc_ (t) to also denoted sci at SCN, delivered by the device 6, are then transmitted to restitution means 10 comprising N of restitution elements 12 ⁇ to 12 ⁇ arranged in predetermined directions relative to a given point 14 in space, corresponding to the center of the restoring means 10.
- the control of these restoring elements 12 ⁇ to 12N by the acoustic signals sci to SCN allows the restitution of the acoustic field picked up by the acquisition means 1.
- the processing means 8 of the device 6, are configured beforehand and are associated specifically with a set of elementary sensors 2 ⁇ to 2Q forming the acquisition means 1 and with a set of restitution elements forming the restitution means 10.
- the means 8 however include a plurality of filter combinations corresponding to different acquisition means and / or different fo Output and user selectable reports tor, for example directly by means of a switch or through a control interface.
- the device 6 can take the form of electronic equipment dedicated to the implementation of the invention or else of computer software comprising program code instructions intended to be executed by equipment comprising a processing processor and interface means with acquisition means and restitution means.
- the device 6 is formed by a computer associated with adapted interface cards.
- the elementary sensors 2 ⁇ to 2Q are arranged at known points in the space around a predetermined point 4, designated as the center of the acquisition means 1.
- each elementary sensor 2 q is expressed in space in a spherical coordinate system such as that described with reference to FIG. 1, centered on the center 4 of the acquisition means 1.
- the elementary sensors 2 ⁇ to 2 Q are distributed in space in a substantially non-regular manner.
- a configuration is not regular if for all the usual landmarks, for at least one of the three coordinates of the landmark, the values of the coordinates of the positions of all the sensors are distributed in a nonzero space interval or domain and with a variable deviation from the coordinates taken successively.
- configurations in which the sensors are arranged at regular intervals along a line or a circle, at the intersections of a fictitious plane grid or even at the intersections of a fictitious cubic mesh are regular configurations.
- the assessment of such an irregular distribution must obviously take into account a tolerance resulting from the constraints of physical realization and from the constraints linked to the dimensioning of the elementary sensors used. Therefore, the coordinates of the sensors must be distributed in an interval greater than a tolerance interval and present deviations varying beyond this tolerance interval
- the position of a sensor corresponds to the position of the center of its sensitive part and a tolerance interval in each direction of space is defined around this position.
- the tolerance interval for a set of elementary sensors forming the acquisition means corresponds to a distance equivalent to a quarter of the distance between the two closest elementary sensors.
- a distance is of the order of 2 cm, so that the tolerance interval corresponds approximately to 0.5 cm.
- a configuration is regular if, in one of the usual references, for the three coordinates of the reference, the coordinate values of the positions of all the sensors are constant or distributed at constant step.
- a configuration is regular if, in one of the usual benchmarks, for all the coordinates of the benchmark, the coordinate values of the positions of all the sensors are distributed in a substantially zero interval or with a substantially constant successive deviation.
- sensors of a substantially non-zero physical size attached to each other form a point distribution or almost point distribution considered as a regular configuration.
- the following method makes it possible to determine whether a given configuration of elementary sensors is regular or not regular.
- a given configuration of elementary sensors is regular or not regular.
- the values of the positions of all the sensors are then checked according to a first coordinate of the reference frame, such as the abscissa. If these values are neither constant nor distributed at regular intervals, considering an interval tolerance, then the configuration is not regular in this coordinate system and we start again with another coordinate system.
- the values of the positions of the sensors are checked according to a second coordinate of the coordinate system, such as the ordinate. If the values of these second coordinates are neither constant, nor distributed at regular intervals, the configuration is not regular in this coordinate system and one starts again with another coordinate system. Conversely, if the values of these coordinates are either constant or distributed at regular intervals, the values of the positions of the sensors are checked according to the third and last coordinate of the reference frame, such as that along a vertical axis called zenithal coordinate. If the values of these third coordinates are neither constant nor distributed at regular intervals, the configuration is not regular in this reference and we start again with another reference.
- the maximum number Q of elementary sensors is less than or equal to five times the number of acoustic signals forming the representation of the acoustic field at the end of the treatment.
- the distribution of elementary sensors 2 q in space can meet certain rules while meeting the criteria of non-regularity as defined above.
- the acquisition means 1 reproduce the general geometric characteristics of the restitution means 10, such as a dis- planar position and a certain symmetry, while respecting the criteria of non regularity. Referring to Figures 3 and 4, we will now describe the operation of the system of the invention. Prior to the implementation of the invention, the acquisition means 1 are arranged in space in a substantially non-regular manner.
- the system of the invention is exposed to an acoustic field P and each sensor 2 q of the acquisition means 1 delivers a measurement signal c q (t) which corresponds to the measurement made by this sensor in the acoustic field P.
- the acquisition means 1 therefore deliver a plurality of acoustic field measurement signals c ⁇ (i) to c Q (t), which are directly linked to the acquisition capacities of the sensors elementary 2 ⁇ to 2Q.
- the method then comprises a step 30 of processing by the application of filter combinations to the measurement signals Ci to CQ delivered by the acquisition means 1.
- these filter combinations are representative of the structural characteristics acquisition means 1 and are adapted to deliver a plurality of acoustic signals sci to SCN each associated with a general direction of predetermined restitution and defined with respect to a given point in space.
- the N channels sc ⁇ (t) to sc ⁇ t) are obtained from the Q measurement signals c ⁇ (t) to c Q (t) by means of a single matrix filtering involving N x Q filters varying in function of the frequency, and noted T n> q (f).
- Each output channel sc nord(t) is obtained by filtering each of the measurement signals c ⁇ (t) to c Q (t) and by applying a linear combination to the signals thus filtered.
- Each filter T n> q (f) is therefore representative of the contribution of the measurement signal c q (t) in the constitution of the channel sc n (i).
- SC n (f) is the Fourier transform of sc n (t)
- C q (f) is the Fourier transform of c q (t).
- the filters T n f) can be organized in a matrix T of size Nx g as follows: u (/) T h2 (f) .- T Q (f) ⁇ u ⁇ f) T 2> 2 (f) ... T 2 ⁇ (f) ⁇ N ⁇ (f) ⁇ Ntl ⁇ f) ... T N ⁇ (f)
- the matrix T is obtained by means of the following matrix relation:
- E is an encoding matrix representative of the characteristics of the acquisition means 1 and in particular of their spatial configuration.
- the matrix E makes it possible to obtain a representation in coefficients of
- the matrix E is of size (L + l) 2 x Q, the coefficient E corresponding to the order to which the encoding is carried out and to the maximum resolution which the encoding makes it possible to achieve.
- the coefficient ⁇ specifies a compromise between the fidelity of representation of the acoustic field P and the minimization of the background noise provided by the elementary sensors 2 ⁇ to 2Q and can take all the values between 0 and 1.
- the parameters L and ⁇ can vary with frequency.
- B is a spatial sampling matrix of size Q x L + lf whose elements B q _ ⁇ _ f) are organized as follows: o, o () B if ) o (f
- each sensor 2 q is placed at the position (r q , ⁇ q , ⁇ q ), has a directivity composed of a combination of omnidirectional and bidirectional diagrams of proportion d q and is oriented in the direction ( ⁇ q a , ⁇ q a ), so that the sensor 2 q has maximum sensitivity in the direction ( ⁇ q , ⁇ q ).
- the elements B q _ ⁇ f are obtained in the following way:
- the parameter d q takes the value for the Q sensors.
- the matrix denoted E is therefore representative of the position of the elementary sensors 2 ⁇ to 2Q.
- the determination of E does not impose any constraint on the position (r q , ⁇ g , ⁇ q ) of the sensors and makes it possible in particular to take into account non-regular configurations.
- Such non-regular configurations are more effective, because they make it possible to take more information from the initial field P, by eliminating the redundancies introduced by the regular configurations.
- the filtering matrix D is a decoding matrix representative of the general predetermined restitution directions selected.
- the matrix D makes it possible to determine the control signals allowing the high precision restitution of the estimated acoustic field P and therefore of the acquired acoustic field P.
- the matrix D is of size N x (L + lf and is obtained by means of the matrix relation next :
- W is a matrix corresponding to a spatial window defining the volume in which the restitution must be made. It is a diagonal matrix of size (L + lf containing weighting coefficients W t and in which each coefficient W ⁇ is found 2 / + 1 time in succession on the diagonal.
- the matrix Wa therefore has the following form:
- the values taken by the coefficients W ⁇ correspond to the values of a function such as a Hamming window of size 21 + 1 evaluated in /, so that the parameter W ⁇ is determined for / ranging from O to L.
- M is a matrix corresponding to the predetermined general rendering directions, ie in multichannel output format. It is a size matrix (L + lf over N, made up of elements /, M, thesis, the indices l, m designating the line l 2 + l + m and n designating the column n.
- the matrix M therefore has the following form: ⁇ 0,0,1 Af " 0,0.2 M 0t0 , N ⁇ 1, -1,1 ⁇ 1, -1, 2 - • M ⁇ _ N • M " l, 0, l ⁇ 1,0 , 2 • • M lfitN Af ,,!,! M 1> 2 - M .. L ⁇ M L _ Lt2 - • M Li .- .N • M fitN • M L r N
- processing step 30 therefore corresponds to the application to all of the measurement signals Ci to CQ, of filtering combinations to generate a plurality of processed signals constituting a representation P of the acoustic field P) substantially independent of the characteristics structural means of acquisition 1, in the form of a finite number of Fourier-Bessel coefficients.
- Step 30 also corresponds to the application, to said processed signals, of specific linear combinations to generate the corresponding plurality of acoustic signals sci to SC ⁇ .
- FIG 4 there is shown schematically the implementation of the processing step 30 performed by the means 8 described above.
- the filters T n> q (f) are applied to the measurement signals c ⁇ (t) to c ⁇ ) by means of the usual filtering methods such as for example: - filtering in the frequency domain such as for example, convolution techniques by block; - filtering in the time domain by impulse response; and - filtering in the time domain by means of recursive filters with infinite impulse response.
- the N output signals sc ⁇ (t) to sc ⁇ t) obtained at the end of the processing of the invention are representative of an acoustic field P which is restored by connecting each channel sc n (t) to the element of corresponding reproduction 12 n emitting plane direction waves ( ⁇ n , ⁇ réelle) according to the specifications of the multichannel format.
- the simultaneous action of the N restoring elements 12 ⁇ to 12w respectively controlled by the channels sc ⁇ (t) to allows to reproduce the sound field P. Thanks to the processing carried out corresponding to the filtering matrix T, the representation of the acoustic field P in multichannel format is close to the acoustic field P in which the sensors 2 q are immersed.
- the matrix T is obtained by manipulating descriptions of the sound field decomposed at a high order and leads to a high quality representation of the sound field. It therefore appears that the implementation of a substantially non-regular distribution of the elementary sensors, makes it possible to single out each of the sensors and to take more spatial information on the acoustic field. Thanks to the processing of the invention, all this information can be restored in the best way possible in order to obtain a high quality representation in multichannel format with a small number of elementary sensors.
- the number of elementary sensors is for example less than 25 and preferably less than 10.
- other types of sensors can be used by modifying the equations according to their nature.
- the elementary sensors may all or in part be omnidirectional and or cardioid sensors.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Analysis (AREA)
- Algebra (AREA)
- Circuit For Audible Band Transducer (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Stereophonic Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0309471A FR2858403B1 (fr) | 2003-07-31 | 2003-07-31 | Systeme et procede de determination d'une representation d'un champ acoustique |
PCT/FR2004/002044 WO2005013643A1 (fr) | 2003-07-31 | 2004-07-29 | Systeme et procede de determination d'une representation d'un champ acoustique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1652406A1 true EP1652406A1 (fr) | 2006-05-03 |
EP1652406B1 EP1652406B1 (fr) | 2021-06-23 |
Family
ID=34043713
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04767818.0A Active EP1652406B1 (fr) | 2003-07-31 | 2004-07-29 | Systeme et procede de determination d'une representation d'un champ acoustique |
Country Status (7)
Country | Link |
---|---|
US (1) | US7856106B2 (fr) |
EP (1) | EP1652406B1 (fr) |
JP (1) | JP5000297B2 (fr) |
KR (1) | KR20060121807A (fr) |
CN (1) | CN1849844B (fr) |
FR (1) | FR2858403B1 (fr) |
WO (1) | WO2005013643A1 (fr) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2736709C (fr) * | 2008-09-11 | 2016-11-01 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Appareil, procede et programme informatique permettant de fournir un ensemble de marques spatiales sur la base d'un signal de microphone, et appareil permettant de fournir un signal audio a deux canaux et un ensemble de marques spatiales |
US8023660B2 (en) * | 2008-09-11 | 2011-09-20 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Apparatus, method and computer program for providing a set of spatial cues on the basis of a microphone signal and apparatus for providing a two-channel audio signal and a set of spatial cues |
NZ587483A (en) | 2010-08-20 | 2012-12-21 | Ind Res Ltd | Holophonic speaker system with filters that are pre-configured based on acoustic transfer functions |
EP2450880A1 (fr) | 2010-11-05 | 2012-05-09 | Thomson Licensing | Structure de données pour données audio d'ambiophonie d'ordre supérieur |
US8873762B2 (en) * | 2011-08-15 | 2014-10-28 | Stmicroelectronics Asia Pacific Pte Ltd | System and method for efficient sound production using directional enhancement |
KR101282673B1 (ko) | 2011-12-09 | 2013-07-05 | 현대자동차주식회사 | 음원 위치 추정 방법 |
EP2765791A1 (fr) * | 2013-02-08 | 2014-08-13 | Thomson Licensing | Procédé et appareil pour déterminer des directions de sources sonores non corrélées dans une représentation d'ambiophonie d'ordre supérieur d'un champ sonore |
US9956910B2 (en) * | 2016-07-18 | 2018-05-01 | Toyota Motor Engineering & Manufacturing North America, Inc. | Audible notification systems and methods for autonomous vehicles |
EP3313089A1 (fr) | 2016-10-19 | 2018-04-25 | Holosbase GmbH | Système et procédé de gestion de contenu numérique |
WO2019149337A1 (fr) * | 2018-01-30 | 2019-08-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Appareils de conversion d'une position d'objet d'un objet audio, fournisseur de flux audio, système de production de contenu audio, appareil de lecture audio, procédés et programmes informatiques |
FR3077886B1 (fr) | 2018-02-13 | 2020-05-22 | Observatoire Regional Du Bruit En Idf | Systeme de signalement de depassement d'un seuil d'intensite sonore |
US11317233B2 (en) * | 2018-05-11 | 2022-04-26 | Clepseadra, Inc. | Acoustic program, acoustic device, and acoustic system |
CN109709519B (zh) * | 2019-01-21 | 2024-03-22 | 广西科技大学 | 一种自由声场批量传声筒幅值灵敏度与相位量测量装置 |
CN114252148B (zh) * | 2021-12-31 | 2022-12-06 | 中国人民解放军海军工程大学 | 一种基于长椭球波叠加的声场重建方法 |
FR3131640B1 (fr) | 2021-12-31 | 2024-05-10 | Observatoire Regional Du Bruit En Idf | Systeme de localisation d’une source sonore, notamment de nuisances sonores provenant de vehicules |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5594800A (en) * | 1991-02-15 | 1997-01-14 | Trifield Productions Limited | Sound reproduction system having a matrix converter |
US6072878A (en) * | 1997-09-24 | 2000-06-06 | Sonic Solutions | Multi-channel surround sound mastering and reproduction techniques that preserve spatial harmonics |
WO2001082651A1 (fr) * | 2000-04-19 | 2001-11-01 | Sonic Solutions | Prise de son ambiant multi-canal et techniques de reproduction qui preservent les harmoniques spatiales en trois dimensions |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3158695A (en) * | 1960-07-05 | 1964-11-24 | Ht Res Inst | Stereophonic system |
GB9307986D0 (en) * | 1993-04-17 | 1993-06-02 | Adaptive Audio Ltd | Method of reproducing sound |
DE19645867A1 (de) * | 1996-11-07 | 1998-05-14 | Deutsche Telekom Ag | Verfahren zur mehrkanaligen Tonübertragung |
US6526147B1 (en) * | 1998-11-12 | 2003-02-25 | Gn Netcom A/S | Microphone array with high directivity |
JP3584800B2 (ja) * | 1999-08-17 | 2004-11-04 | ヤマハ株式会社 | 音場再現方法およびその装置 |
US6845163B1 (en) * | 1999-12-21 | 2005-01-18 | At&T Corp | Microphone array for preserving soundfield perceptual cues |
NZ502603A (en) * | 2000-02-02 | 2002-09-27 | Ind Res Ltd | Multitransducer microphone arrays with signal processing for high resolution sound field recording |
US6826284B1 (en) * | 2000-02-04 | 2004-11-30 | Agere Systems Inc. | Method and apparatus for passive acoustic source localization for video camera steering applications |
JP2001346299A (ja) * | 2000-05-31 | 2001-12-14 | Sony Corp | 音場補正方法及びオーディオ装置 |
JP2002081902A (ja) * | 2000-09-08 | 2002-03-22 | Toshiba Corp | 位置センサ |
JP4465870B2 (ja) * | 2000-12-11 | 2010-05-26 | ソニー株式会社 | 音声信号処理装置 |
AU2003261759A1 (en) * | 2002-08-30 | 2004-03-19 | Nittobo Acoustic Engineering Co., Ltd. | Sound source search system |
EP1547257A4 (fr) * | 2002-09-30 | 2006-12-06 | Verax Technologies Inc | Systeme et procede de transfert integral d'evenements acoustiques |
FI118247B (fi) * | 2003-02-26 | 2007-08-31 | Fraunhofer Ges Forschung | Menetelmä luonnollisen tai modifioidun tilavaikutelman aikaansaamiseksi monikanavakuuntelussa |
-
2003
- 2003-07-31 FR FR0309471A patent/FR2858403B1/fr not_active Expired - Lifetime
-
2004
- 2004-07-29 CN CN2004800258060A patent/CN1849844B/zh active Active
- 2004-07-29 US US10/566,179 patent/US7856106B2/en active Active
- 2004-07-29 KR KR1020067002128A patent/KR20060121807A/ko active Search and Examination
- 2004-07-29 JP JP2006521628A patent/JP5000297B2/ja active Active
- 2004-07-29 EP EP04767818.0A patent/EP1652406B1/fr active Active
- 2004-07-29 WO PCT/FR2004/002044 patent/WO2005013643A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5594800A (en) * | 1991-02-15 | 1997-01-14 | Trifield Productions Limited | Sound reproduction system having a matrix converter |
US6072878A (en) * | 1997-09-24 | 2000-06-06 | Sonic Solutions | Multi-channel surround sound mastering and reproduction techniques that preserve spatial harmonics |
WO2001082651A1 (fr) * | 2000-04-19 | 2001-11-01 | Sonic Solutions | Prise de son ambiant multi-canal et techniques de reproduction qui preservent les harmoniques spatiales en trois dimensions |
Non-Patent Citations (1)
Title |
---|
See also references of WO2005013643A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1849844A (zh) | 2006-10-18 |
FR2858403A1 (fr) | 2005-02-04 |
US20060239465A1 (en) | 2006-10-26 |
EP1652406B1 (fr) | 2021-06-23 |
WO2005013643A1 (fr) | 2005-02-10 |
KR20060121807A (ko) | 2006-11-29 |
FR2858403B1 (fr) | 2005-11-18 |
CN1849844B (zh) | 2010-07-21 |
US7856106B2 (en) | 2010-12-21 |
JP5000297B2 (ja) | 2012-08-15 |
JP2007500962A (ja) | 2007-01-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2898707B1 (fr) | Calibration optimisee d'un systeme de restitution sonore multi haut-parleurs | |
EP1652406A1 (fr) | SYSTEME ET PROCEDE DE DETERMINATION D UNE REPRESENTATION D&a pos;UN CHAMP ACOUSTIQUE | |
EP1546916B1 (fr) | Procede et systeme de traitement d'une representation d'un champ acoustique | |
EP1563485B1 (fr) | Procede de traitement de donnees sonores et dispositif d'acquisition sonore mettant en oeuvre ce procede | |
EP1586220B1 (fr) | Procede et dispositif de pilotage d'un ensemble de restitution a partir d'un signal multicanal | |
EP1992198B1 (fr) | Optimisation d'une spatialisation sonore binaurale a partir d'un encodage multicanal | |
EP2005420B1 (fr) | Dispositif et procede de codage par analyse en composante principale d'un signal audio multi-canal | |
EP1479266B1 (fr) | Procede et dispositif de pilotage d'un ensemble de restitution d'un champ acoustique | |
US20230019535A1 (en) | Audio rendering of audio sources | |
FR2903562A1 (fr) | Spatialisation binaurale de donnees sonores encodees en compression. | |
EP1502475B1 (fr) | Procede et systeme de representation d un champ acoustique | |
FR2996094A1 (fr) | Procede et systeme de restitution d'un signal audio | |
EP3895446B1 (fr) | Procede d'interpolation d'un champ sonore, produit programme d'ordinateur et dispositif correspondants. | |
EP3400599B1 (fr) | Encodeur ambisonique ameliore d'une source sonore a pluralite de reflexions | |
WO2018050292A1 (fr) | Dispositif et procede de captation et traitement d'un champ acoustique tridimensionnel | |
FR3065137A1 (fr) | Procede de spatialisation sonore | |
FR2890280A1 (fr) | Procede de filtrage numerique et de compensation pour lineariser la courbe de reponse d'une enceinte acoustique et moyens mis en oeuvre | |
WO1988004124A1 (fr) | Dispositif de traitement d'un signal electrique audiofrequence | |
EP3934282A1 (fr) | Procédé de conversion d'un premier ensemble de signaux représentatifs d'un champ sonore en un second ensemble de signaux et dispositif électronique associé | |
FR2840759A1 (fr) | Procede de sonorisation | |
FR2943867A1 (fr) | Traitement d'egalisation de composantes spatiales d'un signal audio 3d | |
FR3136072A1 (fr) | Procédé de traitement de signal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20060126 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK GB |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE DK GB |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: H04S 3/02 20060101ALN20201214BHEP Ipc: H04S 3/00 20060101AFI20201214BHEP |
|
INTG | Intention to grant announced |
Effective date: 20210115 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BRUNO, REMY Inventor name: LABORIE, ARNAUD Inventor name: MONTOYA, SEBASTIEN |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE DK GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602004054996 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602004054996 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20210623 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20220324 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20230725 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20230712 Year of fee payment: 20 |