EP3008918A1 - Electroacoustic conversion chain with selectively powered coil - Google Patents
Electroacoustic conversion chain with selectively powered coilInfo
- Publication number
- EP3008918A1 EP3008918A1 EP14728169.5A EP14728169A EP3008918A1 EP 3008918 A1 EP3008918 A1 EP 3008918A1 EP 14728169 A EP14728169 A EP 14728169A EP 3008918 A1 EP3008918 A1 EP 3008918A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control module
- chain according
- turn
- gap
- loudspeaker
- 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
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 230000005284 excitation Effects 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000004323 axial length Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
- H04R29/003—Monitoring arrangements; Testing arrangements for loudspeakers of the moving-coil type
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L19/083—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being an excitation gain
-
- 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
-
- 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
- H04R3/007—Protection circuits for transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/021—Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/041—Voice coil arrangements comprising more than one voice coil unit on the same bobbin
Definitions
- the present invention relates to an electroacoustic conversion line, of the type comprising at least one loudspeaker, this loudspeaker comprising means for generating a magnetic field in a magnetic circuit having an air gap and a membrane secured to turns of conductive material capable of to move in this gap.
- Such an electroacoustic conversion chain makes it possible to convert an electric signal to be broadcast into an acoustic signal.
- the electroacoustic conversion chain comprises a loudspeaker.
- This comprises an axially polarized toroidal magnet inserted into a magnetic circuit.
- This magnetic circuit defines an annular gap where a magnetic field prevails.
- the loudspeaker also comprises a coil of conductive material wound and secured around a tube extended by a membrane capable of generating an acoustic wave.
- the coil is intended to receive a current depending on the signal to be diffused and extends partly into the gap in which it is axially movable.
- the coil has an axial length such that, during operation of the loudspeaker, all or part of the coil is in the gap.
- the entire coil is powered.
- the coils of the coil present in the gap undergo Laplace forces which make them move along the axis of the tube.
- the displacement of these turns causes the displacement of the membrane through the tube, causing the creation of sound.
- This embodiment has a low electroacoustic output due to Joule losses in the coil.
- the object of the invention is therefore to provide an electroacoustic conversion chain having a better performance.
- the subject of the invention is an electroacoustic conversion chain of the aforementioned type, characterized in that it comprises at least one control module comprising at least one input for conveying a signal to be broadcast and at least one output connected to a turn, the control module being adapted to apply to the or each an excitation signal depending on the position of at least one turn relative to the gap.
- the invention has one or more of the following characteristics:
- the control module is able to apply a null signal to all or part of the turns outside the air gap;
- control module comprises at least one input for conveying a position signal with respect to the air gap of at least one turn;
- the chain comprises turns arranged successively along their axis and electrically connected to form at least two disjoint coils arranged successively;
- each output of the control module is connected to a single coil
- the chain includes means for measuring the position of the loudspeaker with respect to the air gap of at least one turn;
- the control module is adapted to apply on each turn a signal of excitation all the lower as this turn is far from the air gap;
- control module is able to control the potential at at least one of its outputs
- the control module is adapted to apply to at least one of its outputs a potential such that the voltage across the corresponding coil is zero;
- the magnetic circuit comprises at least two disjoint magnets, the magnets defining between them wire-gap spaces in which the coil supply son pass;
- the magnetic circuit comprises a central core comprising longitudinal grooves partially partially receiving a coil feed wire.
- FIG. 1 is a diagram of an embodiment of a sound reproduction device comprising an electroacoustic conversion chain according to the invention, a speaker is shown in section;
- FIG. 2 is a detail of a sectional view of an embodiment of a loudspeaker according to the invention
- FIG. 3 is a block diagram illustrating the general structure of an embodiment of an electroacoustic conversion line according to the invention
- FIG. 4 is a set of curves representing the gains of the amplifiers connected to three groups of turns during their displacement through the gap in one embodiment of a loudspeaker according to the invention
- FIG. 5 is a detail of a sectional view along a plane orthogonal to the X-X axis of another embodiment of a loudspeaker according to the invention.
- FIG. 6 is a detail of a sectional view along the plane VI-VI of the speaker of Figure 5;
- FIG. 7 is a detail of a top view of the magnetic circuit of another embodiment of a speaker according to the invention.
- the sound reproduction device 1 illustrated in Figure 1 comprises the electroacoustic conversion chain 2 whose input is connected to the output of a signal source 3 to be broadcast.
- the electroacoustic conversion chain 2 comprises a control module 4 adapted to process the signal to be broadcast and a loudspeaker 5.
- the control module 4 is connected to the loudspeaker for its excitation.
- the loudspeaker 5 comprises a magnetic circuit 10 in which is disposed a toric magnet 15.
- the magnetic circuit 10 comprises a cylinder head 16, comprising a central core
- the magnet is sandwiched between the yoke 16 and the upper plate 18.
- the volume of air between the central core 17 and the upper plate 18 defines an air gap 20, generally O-ring disposed along an axis X-X of the loudspeaker.
- a moving element 25 comprising a guide tube 30 extended by a membrane 35 is slidably mounted along the X-X axis of the loudspeaker with respect to the magnetic circuit.
- the membrane 35 is held by its outer edge to a chassis 40 of the loudspeaker by means of a peripheral suspension 45.
- the moving element 25 also comprises a set of turns 46 of conductive material, wound around the tube 30 of which they are integral.
- the turns are intended to be traversed by a current depending on the signal to be broadcast, this current coming from the control module 4.
- the turns are electrically interconnected to form coils 60A, 60B, 60C, these coils being electrically independent.
- Each coil 60A, 60B and 60C is electrically connected by one of its ends at a point M, N, P respectively.
- the points M, N, P have, for example, different fixed electrical potentials.
- the coils are arranged successively along the length of the moving element extending along the axis X-X.
- Each coil has an axial length substantially equal to the height of the gap.
- the chain comprises means 65 for measuring on the loudspeaker the axial position relative to the air gap of at least one turn, visible on the Figures 1 and 3.
- These measuring means 65 have an output 66, connected to an input 67 of the control module 4, shown in FIG.
- An input 71 of this control module is intended to receive the signal to be broadcast.
- the control module 4 comprises a routing unit 72 for determining a supply signal specific to each coil 60A, 60B, 60C.
- the routing unit comprises an input 73 connected to the input 71 of the control module 4, and an input 74 connected to the input 67 of the same control module.
- the routing unit 72 also has three outputs 75A, 75B and 75C.
- Each of these outputs 75A, 75B and 75C is followed by an amplifier, respectively 80A, 80B and 80C.
- each of these amplifiers 80A, 80B and 80C is respectively connected to one of the three outputs 81A, 81B and 81C of the control module 4.
- the routing unit 72 is able to determine, as a function of the movement of the turns through the gap, the value of the electric current at each of the outputs of the control module 4 so that only the coils at least partially present in the gap are fed.
- the routing unit 72 is able to control the gain K of the amplifier associated with the excitation signal coming from each of the outputs 81 A, 81 B and 81 C of the control module 4.
- this gain K is maximum when the coil connected to this output, respectively 60A, 60B, 60C, is centered in the air gap along X-X.
- This gain K is even smaller than the coil considered is removed from this centered position.
- the curves 85A, 85B and 85C respectively represent the evolution of the gain K for each of the coils 60A, 60B and 60C during their travel through the gap.
- "X" denotes the distance along the axis XX between the yoke 16 and the end of the tube 30 closest to this cylinder head.
- K P * ex, where P, A 2 and x 0 are three real.
- x 0 is a reality specific to each coil. In this case, it is the distance x for which the gain K for the coil considered is maximum.
- P is a constant determining the maximum gain that each of the amplifiers 80A, 80B and 80C is likely to apply between its input and its output.
- a 2 is the square of half the distance between two successive coils.
- the gain of the amplifier 80B is maximum when the coil 60B, to which this amplifier is connected, is centered in the gap at the position x 0B .
- the gain of the amplifier 80B decreases while the gain of the amplifier 80C increases, as it appears on curve 85C.
- the central core 17 has longitudinal grooves 86 partially receiving each supply wire 87 of the coils 60A, 60B, 60C.
- the supply wires 87 are arranged inside the guide tube 30, as shown in FIG. 6, and passing through the guide tube 30 to feed the coils 60A, 60B, 60C.
- a channel 88 passing through the central core 17 and the cylinder head 16 allows the supply wires 87 to be routed to the control module 4.
- a magnetic circuit 90 of the loudspeaker 5 comprises at least two magnets, for example four disjoint magnets 95.
- a magnetic axis ZZ of each magnet 95 is substantially parallel to the axis XX of the loudspeaker 5.
- the magnets 95 are arranged in the magnetic circuit 90 by defining between them grommet spaces 100.
- the grommet spaces 100 are suitable for allowing the passage of electrical wires, for example the electrical wires for supplying coils 105 of the loudspeaker 5.
- the coils 105 advantageously have a polygonal section in a plane orthogonal to the X-X axis, for example a square section.
- a central core 1 10 of the magnetic circuit 90 advantageously has the same polygonal section as the coils 105.
- the routing unit 72 is able to impose a specific electrical potential at the output 81 A, 81 B, 81 C of the corresponding amplifier, 80A, 80B, 80C respectively, when the coil connected thereto, 60A, 60B, 60C respectively, is not energized.
- each output 81 A, 81 B, 81 C is such that the electrical voltage between the output 81 A, 81 B, 81 C, and the point M, N, P respectively, is substantially opposite to the electrical voltage induced at the terminals of the corresponding coil, 60A, 60B, 60C respectively, by the displacement of this coil in the magnetic field generated by the magnet (s) of the loudspeaker.
- the electrical voltage induced by the displacement of the coils in the magnetic field in the loudspeaker generates an induced electric current.
- This induced electric current creates a counter-driving force opposing the displacement of the moving element, which reduces the electroacoustic output of the electroacoustic conversion chain.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Computational Linguistics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1355337A FR3006847B1 (en) | 2013-06-10 | 2013-06-10 | ELECTROACOUSTIC CONVERSION CHAIN WITH SELECTIVELY POWERED COIL |
PCT/EP2014/061396 WO2014198578A1 (en) | 2013-06-10 | 2014-06-02 | Electroacoustic conversion chain with selectively powered coil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3008918A1 true EP3008918A1 (en) | 2016-04-20 |
EP3008918B1 EP3008918B1 (en) | 2019-07-24 |
Family
ID=49212824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14728169.5A Active EP3008918B1 (en) | 2013-06-10 | 2014-06-02 | Electroacoustic conversion chain with selectively powered coil |
Country Status (4)
Country | Link |
---|---|
US (1) | US10142753B2 (en) |
EP (1) | EP3008918B1 (en) |
FR (1) | FR3006847B1 (en) |
WO (1) | WO2014198578A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9693139B1 (en) * | 2016-03-30 | 2017-06-27 | Ford Global Tecghnologies, LLC | Systems and methods for electronic sound enhancement tuning |
US10194249B2 (en) * | 2017-06-14 | 2019-01-29 | Apple Inc. | Multi-coil loudspeaker driver |
US11382511B2 (en) | 2017-07-27 | 2022-07-12 | Logicmark, Inc. | Method and system to reduce infrastructure costs with simplified indoor location and reliable communications |
CN110446144B (en) * | 2019-07-22 | 2021-10-22 | 瑞声科技(新加坡)有限公司 | Sound production device |
GB2586528B (en) * | 2019-08-23 | 2021-09-22 | Tymphany Acoustic Tech Huizhou Co Ltd | A method and system for driving a voice coil of a loudspeaker |
GB2591767B (en) * | 2020-02-05 | 2023-05-17 | Tymphany Acoustic Tech Huizhou Co Ltd | A method and system for driving a voice coil of a loudspeaker |
CN111654793A (en) * | 2020-06-29 | 2020-09-11 | 歌尔股份有限公司 | Voice coil and sound generating device |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6130954A (en) * | 1996-01-02 | 2000-10-10 | Carver; Robert W. | High back-emf, high pressure subwoofer having small volume cabinet, low frequency cutoff and pressure resistant surround |
GB2384938B (en) * | 2002-01-31 | 2005-07-20 | 1 Ltd | Suspension system for electro-acoustic transducer |
US8284982B2 (en) * | 2006-03-06 | 2012-10-09 | Induction Speaker Technology, Llc | Positionally sequenced loudspeaker system |
JP5332146B2 (en) * | 2007-07-26 | 2013-11-06 | ヤマハ株式会社 | Speaker device |
US8139816B2 (en) * | 2007-09-26 | 2012-03-20 | Sentient Magnetics, Inc. | Acoustic transducer |
CN201967123U (en) * | 2011-01-07 | 2011-09-07 | 瑞声光电科技(常州)有限公司 | Electro-acoustic transducer |
US8879774B2 (en) * | 2011-04-12 | 2014-11-04 | Harman International Industries, Incorporated | Loudspeaker magnet assembly with two inner magnets comprising a central bore |
-
2013
- 2013-06-10 FR FR1355337A patent/FR3006847B1/en active Active
-
2014
- 2014-06-02 US US14/897,263 patent/US10142753B2/en active Active
- 2014-06-02 EP EP14728169.5A patent/EP3008918B1/en active Active
- 2014-06-02 WO PCT/EP2014/061396 patent/WO2014198578A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2014198578A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014198578A1 (en) | 2014-12-18 |
FR3006847B1 (en) | 2017-02-10 |
US20160142841A1 (en) | 2016-05-19 |
EP3008918B1 (en) | 2019-07-24 |
FR3006847A1 (en) | 2014-12-12 |
US10142753B2 (en) | 2018-11-27 |
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