EP1728409A1 - Dispositif de sonorisation a controle de rayonnement geometrique et electronique - Google Patents
Dispositif de sonorisation a controle de rayonnement geometrique et electroniqueInfo
- Publication number
- EP1728409A1 EP1728409A1 EP05736560A EP05736560A EP1728409A1 EP 1728409 A1 EP1728409 A1 EP 1728409A1 EP 05736560 A EP05736560 A EP 05736560A EP 05736560 A EP05736560 A EP 05736560A EP 1728409 A1 EP1728409 A1 EP 1728409A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electroacoustic
- sources
- loudspeakers
- network
- electroacoustic sources
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
Definitions
- the device object of the present invention relates to the sound system of acoustically reverberant premises.
- the loudspeakers must radiate in a directive manner towards the listeners, so that the direct sound perceived by them (sound propagating directly from the speaker listeners) or significant energy compared to that of the sound reaching it after reverberation by the walls of the room.
- the sound system must also provide the most homogeneous sound coverage possible in the area to be sounded.
- the listeners are generally located on a horizontal plane with a large surface area, we are led to consider a column type enclosure, the directivity of which is marked in the vertical plane, and not very marked in the horizontal plane.
- FIG. 1 2- State of the art Figure 1 describes a typical configuration.
- the enclosure (11) must produce the most homogeneous sound level possible over an entire area (12) where the audience is located, and this over the widest possible frequency band. It must also, as we have seen, minimize the sound energy radiated elsewhere than towards the audience, in order to minimize the energy reverberated by the room and reaching the listeners.
- Two types of approach have been developed to achieve this objective: geometrically controlled networks, and electronically controlled networks.
- the patents FR 2626886 and derivatives describe a device making it possible to generate a wave front close to this objective.
- the principle uses a cylindrical waveguide excited at one of its ends by a loudspeaker, and radiating at the other end by an elongated rectangular opening.
- the shape of the waveguide is such that the radiated sound field is similar to that radiated by a rectangular piston of elongated shape.
- FIG. 2 illustrates this principle with a superposition of eight waveguides (22) such as that described in patent FR 2626886, associated with eight loudspeakers (21), generating a wavefront (23).
- the patents FR 2813986 and associated describe another waveguide allowing to reach the same objective. But this principle of geometric synthesis of the wave front inevitably leads to a form of curved enclosure. It is therefore difficult to apply if the enclosure is intended to be mounted vertically, for example as a wall or pillar.
- Patent US5590214 entitled “Vertical Array Type Speaker” presents a device made up of two columns of loudspeakers mounted face-to-face, radiating through a vertical slot. However, this device is not capable of generating a wave front ensuring uniform sound coverage.
- FIG. 3 illustrates the principle of using delays (31), denoted R n in the figure, associated with loudspeakers (34) via filters (32) and power amplifiers (33) to approach the front of waves (35) wanted.
- R n (nl) .a / c.sin ( ⁇ ), c being the speed of the sound, n being the index of the loudspeaker.
- Patents EP0791279 and associated present a device of this type, and claim a principle of positioning of the loudspeakers, which are regularly spaced on a part of the enclosure, then logarithmically spaced. This principle makes it possible to limit the number of speakers required, but leads to an unequal distribution of powers on all the speakers, and therefore to a lower maximum radiated sound level than if the power were equally distributed on all the loudspeakers. speakers as is the case in geometric networks.
- the electronically controlled network has the advantage of being able to control to a certain extent the structure of the radiated field without mechanical alteration of the device, by simply playing on the filtering parameters.
- Curved speaker arrays have been implemented as part of the WFS (see article by Evert W. Start “Application of Curved Arrays in Wave Field Synthesis", preprint n ° 4143, 100 th Convention de l ' AES, 1996).
- Patents EP12099498 and associated describe an implementation of the WFS with a particular type of loudspeakers. Mark S. Ureda's article "Wave Field
- the objective is to be able to generate wave fronts of various shapes, and the orientations of the emission axes of the loudspeakers are perpendicular to the network.
- the control of the radiation of the network is therefore done exclusively thanks to the electronic parameters (delays and filters essentially), and not by playing on the orientations of the loudspeakers as is the case for the geometrically controlled networks of which we have spoken.
- the advantage of the device which is the subject of the present invention is to combine the advantages of the geometric network with those of the electronically controlled network: it allows excellent control of the radiated acoustic field, minimizing the secondary lobes, optimizing the maximum emissible power thanks to a homogeneous distribution. on all the loudspeakers, while having a rectilinear shape allowing easy integration, for example applied on a wall.
- the subject of the invention is a sound device allowing homogeneous sound coverage over a zone to be sounded, comprising a network of electroacoustic sources, each electroacoustic source diffusing a version delayed by a delay, filtered by a filter, and amplified.
- said network is essentially rectilinear and vertical, in that the angles ⁇ formed by the emission axes of the electroacoustic sources and the normal to the network are such that que n > ⁇ n - ⁇ , where n is the index of the electroacoustic sources numbered in increasing order from the top to the bottom of the device, and in that the delays cooperate with the angles ⁇ so that the device generates a wave front the shape corresponding to the desired sound coverage of the area to be sounded.
- the angles of inclination ⁇ of the electroacoustic sources are chosen such that for each of the electroacoustic sources, the distance d separating the center of said electroacoustic source from the point of intersection between the emission axis of said electroacoustic source and the desired wavefront is minimal.
- R n is the delay (in seconds) associated with the n 'th electroacoustic source, R being one, c being the speed of sound in m / s, the distances d being expressed in meters.
- FIG. 1 represents a configuration of traditional sound system
- FIG. 2 represents the principle of a geometrically controlled network conforming to the state of the art
- FIG. 3 represents the principle of an electronically controlled network conforming to the state of the art
- FIG. 4 represents the principle of the invention, seen in longitudinal section
- FIG. 5 represents a front view of the loudspeaker network mounted in an enclosure
- FIG. 6 represents a front view of an essentially rectangular diaphragm speaker
- FIG. 7 represents, in the form of front views, the assembly of speakers with rectangular and circular membranes
- FIG. 8 represents an embodiment of the invention seen in longitudinal section, in which the electroacoustic sources consist of groups of loudspeakers
- FIG. 9 represents an embodiment of the invention seen in longitudinal section, in which the electroacoustic sources are of different heights.
- a network of N electroacoustic sources (1) is associated with delays (3), filters (4), and power amplifiers (5).
- the electroacoustic sources (1) are aligned vertically, and oriented so that, combined with a set of delays (3) suitably chosen, they generate the front wave (6) of the desired shape, corresponding to a desired sound coverage on an area to be sounded. Filters and delays can of course be swapped, and other elements (limiters for example) can be inserted upstream of the power amplifiers.
- the input signal to be broadcast is applied to all electroacoustic sources via delays (3), filters (4), and amplifiers (5).
- the originality of the present invention therefore consists in generating the desired wave front (6) by playing both on a geometric aspect thanks to the orientations and positioning of the electroacoustic sources (1) of the network, and on an electronic aspect by compensating in particular by delays (3) the spatial shifts between the electroacoustic sources (1).
- the angle of inclination ⁇ n of the n th electroacoustic source is such that the distance d n separating the center of said electroacoustic source from the point of intersection between the emission axis of said source electroacoustic and the desired wavefront is minimal, and this for all electroacoustic sources.
- R ⁇ 0 or any other value. It is noted that these are the differences d n - ⁇ -d n which occur, and therefore that the above definition does not depend on the propagation of the wave front.
- the distance between the lower end and the upper end of said source is called the height of an electroacoustic source (1).
- a shape of the wavefront (6) and a given type of electroacoustic source corresponds to a set of angles ⁇ and values of the delays (3).
- the delays (3) values slightly different from those resulting from the formulas given above, and possibly playing on the gains and frequency responses of the filters (4), it is possible to generate a different wavefront. of the one corresponding to the set of angles ⁇ . This allows, for example, to partially correct the effect of positioning the column at a height different from that for which it was designed (tilt angles ⁇ ), or to correct an inadequate sound level in a certain area resulting from an acoustic phenomenon in the room considered. If the electroacoustic sources are not all identical, then the filters (4) will also be used to correct the differences which may exist between their characteristics of frequency and / or time responses.
- Filters (4) and delays (3) can be implemented by a digital signal processor (DSP) equipped with suitable software.
- DSP digital signal processor
- the length of the network is an important parameter of the invention, as it is for all other types of networks. The larger it is, the larger the area that the network can cover, and the better the homogeneity of coverage at low frequencies.
- the electroacoustic sources (1) are direct-radiation loudspeakers, these loudspeakers being preferably equipped with essentially rectangular membranes. Optimal performance in terms of rejection of the secondary lobes is obtained when each loudspeaker radiates in the manner of a rectangular piston as high as the distance between loudspeakers allows.
- Figure 5 shows a front view of the speaker array (51) mounted in an enclosure (52), the radiating faces of which are preferably essentially rectangular, possibly slightly curved in the vertical plane to better match the shape of the front of 'waves to restore.
- Figure 6 shows an essentially rectangular diaphragm speaker (61) seen from the front.
- the electroacoustic sources (1) are loudspeakers radiating through waveguides.
- Each waveguide radiates through an essentially rectangular orifice and such that the particle acoustic speed is at all times essentially the same at any point of the radiation orifice.
- optimal performance in terms of rejection of the secondary lobes is obtained when the waveguides radiate through a rectangular opening as would a rectangular piston (for example those described in the patents FR 2626886 and FR 2813986 already mentioned), and that their height is as large as the gap between waveguides allows.
- the electroacoustic sources (1) are groups of loudspeakers, all the loudspeakers of the same group being located in the same plane, arranged side by side and excited by the same electrical signal.
- the loudspeakers of the same group are thus assembled in such a way that the group radiates essentially as a rectangular piston would do in the frequency band considered. Indeed, for frequencies corresponding to wavelengths shorter than the distance between adjacent speakers, the radiation of a regular assembly of small speakers in a group of speakers is close to the radiation of a piston the size of the assembly.
- FIG. 7 gives two examples of assembly of loudspeakers in a group of loudspeakers for rectangular and circular diaphragm speakers (71), seen from the front, on the diaphragm side.
- Figure 8 illustrates this implementation of the invention in the case of eight groups of 4 speakers. This figure is identical to Figure 4, except the electroacoustic sources (1) which have been replaced by groups of speakers (81).
- the electroacoustic sources (1) are of different heights, the height of each source being essentially a function of the associated angle ⁇ : the smaller it is, the higher the height of the source perhaps large.
- FIG. 9 in which the indices (1), (2), (3), (4), (5), and (6) have the same meanings as in FIG. 4.
- This embodiment has the advantage of minimizing the depth of the column, denoted p in FIG. 9.
- the electroacoustic sources (1) can be mounted or fixed on the same enclosure (2).
- the rear faces of the membranes of the electroacoustic sources (1) can then either radiate each in an independent volume resulting from a partitioning of the enclosure (2), or radiate all in the same volume. Indeed, for the frequencies located beyond the resonant frequency of the loudspeakers, these are essentially controlled by their moving mass, and not by the stiffness of the volume of air which charges them at the rear.
- each electroacoustic source (1) is mounted on an enclosure which is specific to it, and the enclosures assembled according to the principle of positioning and orientation exposed above using a mechanical device.
- the electroacoustic sources (1) are fixed to speakers mechanically connected to each other.
- This embodiment makes it possible to optimally adjust the orientations of the electroacoustic sources (1) for a given positioning of the device and a desired sound coverage.
- Delays (3) and filters (4) can be performed by a digital signal processor (DSP) equipped with the appropriate software.
- Delays (3), filters (4) and amplifiers (5) can be loaded into the enclosure (2), or remain outside the enclosure.
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0403052A FR2868237B1 (fr) | 2004-03-25 | 2004-03-25 | Dispositif de sonorisation a controle de rayonnement geometrique et electronique |
PCT/FR2005/000597 WO2005104609A1 (fr) | 2004-03-25 | 2005-03-11 | Dispositif de sonorisation a controle de rayonnement geometrique et electronique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1728409A1 true EP1728409A1 (fr) | 2006-12-06 |
EP1728409B1 EP1728409B1 (fr) | 2012-09-26 |
Family
ID=34945082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05736560A Active EP1728409B1 (fr) | 2004-03-25 | 2005-03-11 | Dispositif de sonorisation a contrôle de rayonnement géométrique et électronique |
Country Status (5)
Country | Link |
---|---|
US (1) | US7426278B2 (fr) |
EP (1) | EP1728409B1 (fr) |
CN (1) | CN1965608B (fr) |
FR (1) | FR2868237B1 (fr) |
WO (1) | WO2005104609A1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101297300B1 (ko) * | 2007-01-31 | 2013-08-16 | 삼성전자주식회사 | 스피커 어레이를 이용한 프론트 서라운드 재생 시스템 및그 신호 재생 방법 |
TWI369142B (en) * | 2008-01-22 | 2012-07-21 | Asustek Comp Inc | Audio system and a method for detecting and adjusting a sound field thereof |
KR20100131484A (ko) * | 2008-03-13 | 2010-12-15 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 스피커 어레이 및 이를 위한 드라이버 구조물 |
ITMC20100095A1 (it) * | 2010-09-17 | 2012-03-18 | F B T Elettronica Spa | Array di altoparlanti. |
BR112013009301A2 (pt) * | 2010-10-21 | 2016-07-26 | Acoustic 3D Holdings Ltd | gerador de difusão acústica |
EP3755003A1 (fr) * | 2014-09-30 | 2020-12-23 | Apple Inc. | Pavillon acoustique multiconducteur pour la commande de faisceau horizontale |
GB2532794A (en) * | 2014-11-28 | 2016-06-01 | Digital Audio S A | Versatile electroacoustic diffuser-absorber |
DE112017000382T5 (de) * | 2016-01-14 | 2018-09-27 | Harman International Industries, Incorporated | Schallstrahlungsmustersteuerung |
CN109626500A (zh) * | 2018-12-20 | 2019-04-16 | 余姚市荣大塑业有限公司 | 一种饮用水杀菌装置和杀菌监管系统 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2569872B2 (ja) * | 1990-03-02 | 1997-01-08 | ヤマハ株式会社 | 音場制御装置 |
JPH07143588A (ja) * | 1993-11-12 | 1995-06-02 | Hisaji Nakamura | 垂直アレイ型スピーカ装置 |
NL9401860A (nl) * | 1994-11-08 | 1996-06-03 | Duran Bv | Luidsprekersysteem met bestuurde richtinggevoeligheid. |
GB9506263D0 (en) * | 1995-03-28 | 1995-05-17 | Sse Hire Limited | Loudspeaker system |
US6343133B1 (en) * | 1999-07-22 | 2002-01-29 | Alan Brock Adamson | Axially propagating mid and high frequency loudspeaker systems |
US7027605B2 (en) * | 1999-10-20 | 2006-04-11 | Harman International Industries, Incorporated | Mid-range loudspeaker |
FR2813986B1 (fr) | 2000-09-08 | 2002-11-29 | Eric Vincenot | Dispositif de sonorisation a guide d'onde acoustique |
US7826622B2 (en) * | 2003-05-27 | 2010-11-02 | Harman International Industries, Incorporated | Constant-beamwidth loudspeaker array |
-
2004
- 2004-03-25 FR FR0403052A patent/FR2868237B1/fr not_active Expired - Fee Related
-
2005
- 2005-03-11 EP EP05736560A patent/EP1728409B1/fr active Active
- 2005-03-11 US US10/593,821 patent/US7426278B2/en not_active Expired - Fee Related
- 2005-03-11 CN CN2005800095509A patent/CN1965608B/zh not_active Expired - Fee Related
- 2005-03-11 WO PCT/FR2005/000597 patent/WO2005104609A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2005104609A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1728409B1 (fr) | 2012-09-26 |
US7426278B2 (en) | 2008-09-16 |
US20070165876A1 (en) | 2007-07-19 |
FR2868237B1 (fr) | 2006-05-19 |
CN1965608A (zh) | 2007-05-16 |
FR2868237A1 (fr) | 2005-09-30 |
WO2005104609A1 (fr) | 2005-11-03 |
CN1965608B (zh) | 2011-08-17 |
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