EP0295971A1 - HiFi-elektroakustischer Leistungsumwandler mit versetztem Abstrahlsystem - Google Patents

HiFi-elektroakustischer Leistungsumwandler mit versetztem Abstrahlsystem Download PDF

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Publication number
EP0295971A1
EP0295971A1 EP88400956A EP88400956A EP0295971A1 EP 0295971 A1 EP0295971 A1 EP 0295971A1 EP 88400956 A EP88400956 A EP 88400956A EP 88400956 A EP88400956 A EP 88400956A EP 0295971 A1 EP0295971 A1 EP 0295971A1
Authority
EP
European Patent Office
Prior art keywords
speakers
sets
loudspeakers
column
transducer
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.)
Withdrawn
Application number
EP88400956A
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English (en)
French (fr)
Inventor
Clément Eloise-Pillerault
Claude Benoit
Vincent Benoit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0295971A1 publication Critical patent/EP0295971A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type for loudspeaker transducers
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • 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

Definitions

  • the field of the invention is that of electroacoustic transducers ensuring high fidelity sound reproduction, and capable of operating at high emission powers.
  • horn diffusers also known as flags.
  • Certain embodiments of diffusers of this type have the advantage of a relatively homogeneous directivity over the whole range of frequencies available above about 800 Hertz.
  • the technology of horn diffusers has drawbacks which are manifested in particular by the large volumes which the reproduction of the low-medium requires, by the appearance of distortions at high sound levels, and by the fragility of the material.
  • a first object of the invention is to produce an electroacoustic transducer of simple construction, with maximum efficiency, making it possible to work at high sound reproduction powers with optimum reproduction fidelity.
  • Another fundamental object of the invention is to provide an electroacoustic transducer having an exceptional capacity for fine adjustment of the conditions of sound reproduction (either during mounting or during use) of the transducer.
  • This adjustment capacity results mainly from the physical layout configuration (staged diffusion system, comprising a doublet whose two opposite emission planes are combined), the electrical filtering means being reduced to a minimum (a few elements) to avoid degradation of the overall performance of the transducer.
  • Another object of the invention is to provide such a transducer, the operation of which is particularly suitable for restoring frequencies extending from the low-mid to the high-mid (about 150 Hz to 5000 Hz, for example).
  • An additional object of the invention is to produce the transducer by means of a multiplicity of speakers of small dimensions, in order to contribute both to the efficiency and to the fidelity of reproduction.
  • the specific implantation configuration of the transducer according to the invention makes it possible to operate each loudspeaker in its optimal operating range, using reduced electrical filtering to minimize the deterioration in efficiency.
  • an electroacoustic transducer in particular for the sound reproduction of an electrical signal in the low-medium and high-medium frequencies, of the constituted type.
  • several sets of loudspeakers each set comprising at least one loudspeaker, transducer characterized in that it consists of at least three distinct sets of loudspeakers forming a diffusion system, at least one of said sets of loudspeakers being centered in front of the diffusion system, and operating as a doublet, and at least two other sets of speakers being set back from the said first set or sets, and in that electrical filtering means are interposed between the source of the electrical signal and at least the said front set (s) of the broadcasting system so as to obtain the preferential reproduction of the high-mid frequencies by said front set of speakers .
  • said rear clearances are positioned symmetrically with respect to the central axis of emission of the broadcasting system, in order to obtain homogeneity of the sound reproduction in the listening space.
  • any equivalent means preserving this homogeneity is covered by this patent.
  • said filtering means comprise means for balancing the sound reproduction levels of the different sets of speakers, by action of adjusting the power supply of each of said sets as a function of the characteristics of the speakers correspondents.
  • the physical layout configuration characteristic of the transducer makes it possible to obtain, after adjusting the electrical and acoustic phase shift of the speaker sets, a completely surprising and effective synergy between the specialization of the front sets and rear and the spatial effect of the front doublet.
  • the layout configuration allows multiple fine tuning possibilities ensuring optimal use of each speaker in its preferred operating range.
  • all the speakers of the system are divided into three columns, each made up of the same number of speakers arranged in rectilinear vertical parallel alignment with the same emission plane, said three columns of loudspeakers being located so that one of them constitutes the front part of the transducer diffusion system, the other two columns constituting the part offset towards the rear, in an arrangement such that the rear columns emit in a plane parallel to the emission plane of the front column, symmetrically to the latter.
  • the number and the characteristics of the loudspeakers constituting each game on the one hand, and their connection on the other hand, are chosen so as to favor even more advantage the restitution of the frequencies of low-medium by the games rear, and those of high-mid frequencies by the front stops.
  • the front central column is formed of a simple support plane for receiving the corresponding loudspeakers, without a wall for enclosing the rear face of said loudspeakers, so that the front emission and the rear emission of the diaphragm form a doublet; in addition, the rear column loudspeakers are advantageously coupled to a resonant Helmholtz cavity.
  • the loudspeaker columns mounted behind the transducer form a twin sub-assembly with adjustable common wall, in accordance with the type described in patent application n ° 8617423 filed on 12 December 1986 in the names of the same inventors as those of the present application.
  • the transducer of the invention offers multiple adjustment possibilities for its development, assembly or use.
  • the transducer 10 represented consists of a front central column 11, flanked by a pair of rear columns 12, 13.
  • Each of the columns 11, 12, 13 has a vertical alignment of 4 speakers.
  • the loudspeakers of the rear columns 12, 13 are identical.
  • the speakers of the front column 11 may have characteristics distinct from those of the speakers of the rear columns.
  • the loudspeakers 22, 23 of the rear columns 12, 13 are mounted in cavities of the Helmoltz type 32, 33. These cavities consist of a common rear vertical wall 40, of a portion of the two side panels 42, 43 of the acoustic enclosure, and a front panel 41 for receiving the speakers 22, 23.
  • the front panel 41 is provided with lateral vents 46, with or without laminar effect.
  • the separation of the cavities 32, 33 is ensured by a dividing partition 44 of which at least a portion is adjustable in displacement.
  • the means 45 for adjusting the displacement of the partition 44 for example consist of a threaded rod - tapped nut system, operated by external flywheels.
  • the operating principle of this type of twin cavity with adjustable common partition is described in patent application 8617423 already cited.
  • the objective is to provide a method of equalization, and of correction, of the restored signal, without harming the efficiency of the transducers, by adjusting the resonance frequencies of the cavities 32, 33 twinned.
  • the operation adjustment consists in shifting the amplitude / frequency response curves of each column 12, 13 relative to each other so as to achieve a compensation effect for irregularities in the response curve, and as a complement, an effect of modifying the tone of the resulting sound signal.
  • this phenomenon is explained by the typical shape of the response curve of the Helmholtz cavity transducers, formed by a succession of alternating variations in the power level around an average value Lm.
  • the response curve A corresponds to column 12, and the response curve C corresponds to column 13. These curves similarly present a succession of alternations beyond the slope at 18 dB, but have been offset by the value half-wave by adjusting the resonance frequencies of the Helmholtz cavities.
  • the curve df supports the displacement of the point P of the response curve C of the column 13 when the internal volume of the cavity 33 of the column 13 is varied. Consequently, the displacement of the movable dividing partition 44, or d 'a portion of it, causes a relative displacement of the response curves A, C of the two twin columns 12, 13.
  • the relative position of the response curves A, C at a given moment ensures more or less complete compensation for irregularities alternating curves.
  • the aim of the correction may, for example, be to compensate for defects in the electrical recording of the sound signal, or else in the acoustics of the listening room.
  • the front central column 11 consists of a simple panel 31 supporting the line of speakers 21.
  • This panel 31 is anchored, after adjustment, by its upper and lower ends, to the horizontal panels 14 and 15 of the enclosure, and can be stiffened by spacers connecting it, between the speakers, to the rear panel.
  • the rear face of the speakers 21 is perfectly clear and the sound emissions of opposite phases, generated at the front and at the rear, constitute an acoustic doublet.
  • This advantageous configuration of the front column reinforces the specialization of the speakers 21 for the reproduction of high frequencies. Indeed, only the high frequencies can be emitted without attenuation by the column 11, due to the acoustic short-circuit due, from a certain wavelength, to the absence of screen between the two faces of the diaphragm speakers 21.
  • the layered layout of the columns 11, 12, 13 provides a particularly advantageous spatial effect.
  • the spatial effect is all the more reinforced as the twin rear columns 12, 13 themselves produce an equalization effect of the restored signal.
  • the inventors have been able to observe a surprising synergistic effect by its efficiency, after adjusting the phase shift of the sound emissions of the front column relative to the rear columns, between the doublet effect of the front column and the frequency specialization of the columns. .
  • the doublet of the front column produces in known manner an effect spatial due to the relocation of sound emission sources.
  • the transducer according to the invention produces a doublet whose two emission phases in opposite directions and phases emit substantially from the same plane (the plane of the diaphragm of each of the loudspeakers 21).
  • the transducer according to the invention makes it possible to finely adjust, over a wide range of values, the acoustic and electrical phase shift between the front column and the rear columns: - the acoustic phase shift, resulting from the offset "d" between the two emission planes of columns 11, 12-13, is effective particularly in the vicinity of the recovery frequency (that is to say the input frequency in action of the front speakers); the electrical phase shift, produced by filtering as described below, acts more particularly at the higher frequencies of the high-mid range.
  • a passive filter defines a supply path for the central front column 11 favoring the higher frequencies.
  • the selectivity effect is further accentuated by the way in which the loudspeakers of each column are connected.
  • the source electrical signal introduced at the input of the passive filter 50 is delivered before filtering in the direction of the speakers 22, 23 of the columns 12, 13.
  • the four speakers 22 and 23 of the columns 12, 13 respectively are mounted in series, the columns 12, 13 being themselves supplied in parallel.
  • the loudspeakers 21 of the column 11 are mounted in series-parallel, so that the column 11 has a lower impedance compared to that of each of the columns 12, 13.
  • This arrangement thus makes it possible to accentuate the selectivity of column 11 for the high frequencies.
  • the speakers of the front column 11 on the one hand, and rear columns 12-13 on the other hand have a slight difference in structure: in fact, the speakers fronts include a reel holder in macromolecular plastic, while the reel holder for the rear speakers is made of aluminum.
  • the use of a conductive material for the coil support increases the power admissible by the loudspeaker, because it increases its heat dissipation capacity; on the other hand, a non-conductive coil support is preferable at high frequencies, for which the power restored, and therefore the dissipation requirements are lower, but where the risks of harmful coil / support-coil coupling are greater.
  • the columns are specialized as follows: - the rear columns 12, 13 preferentially reproduce the lower frequencies, in particular when care has been taken to tune the Helmhotz cavities corresponding to these frequencies; - the high frequencies are preferably restored by the front column 11.
  • the rear columns 12, 13 are particularly suitable for providing the greatest transmission power required in the register of lower frequencies.
  • the front column 11 favors in however the reproduction fidelity of high frequencies.
  • the invention has been implemented in a prototype of the type shown in FIGS. 1 and 2.
  • FIG. 4 also represents an alternative embodiment of the invention, in which the transducer with three columns 60 is mounted in a box 61 also comprising 3 loudspeakers 62, 63 for the bass voices, and 1 loudspeaker extreme treble not shown for harmonics.
  • the broadcasting system implementing the principle of the invention shown under the reference 60, consists of 3 columns each comprising only two loudspeakers aligned vertically.
  • the "columns" can be arranged horizontally, by rotation of 90 ° of the diffusion system in a vertical plane, from which there results a modification of the spatial distribution of the frequencies as well as dimensions of congestion .
  • the invention is of course not limited to the layout configurations shown in the drawings.
  • the transducers whose front clearance is formed by a group of several loudspeakers arranged in rows, columns, circles, etc., or combinations of these figures. It is the same for the rear speaker sets: there is nothing to prevent the rear sets themselves forming, for example, a ring of speakers more or less uniformly distributed with respect to the central axis of the broadcasting system.

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  • 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)
EP88400956A 1987-04-23 1988-04-20 HiFi-elektroakustischer Leistungsumwandler mit versetztem Abstrahlsystem Withdrawn EP0295971A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705741A FR2609853B1 (fr) 1987-04-23 1987-04-23 Transducteur electroacoustique de puissance, a haute fidelite, a systeme de diffusion etage
FR8705741 1987-04-23

Publications (1)

Publication Number Publication Date
EP0295971A1 true EP0295971A1 (de) 1988-12-21

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EP88400956A Withdrawn EP0295971A1 (de) 1987-04-23 1988-04-20 HiFi-elektroakustischer Leistungsumwandler mit versetztem Abstrahlsystem

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EP (1) EP0295971A1 (de)
FR (1) FR2609853B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006397A1 (en) * 1993-08-20 1995-03-02 Centralforce Limited Loudspeaker
DE19844552A1 (de) * 1998-09-29 2000-05-31 Helmut Kremer Permanent-Dynamischer Lautsprecher mit zylindrischer Abstrahlung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0628876Y2 (ja) * 1988-03-01 1994-08-03 株式会社ケンウッド 低音域再生用スピーカシステム
FR2857148B1 (fr) * 2003-10-21 2006-02-03 Jean Philippe Martin Procede de sonorisation d'un local et paroi de diffusion sonore
WO2008025060A1 (en) * 2006-08-29 2008-03-06 Immersion Technology Property Limited Loudspeaker system with adjustable response
FR2923343A1 (fr) * 2007-11-07 2009-05-08 Peugeot Citroen Automobiles Sa Procede et systeme acoustique pour restituer un spectre sonore dans un habitacle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824343A (en) * 1972-11-29 1974-07-16 J Dahlquist Multiple driver dynamic loud speaker
US3927261A (en) * 1972-11-29 1975-12-16 Jon G Dahlquist Multiple driver dynamic loud speaker
FR2312909A1 (fr) * 1975-05-26 1976-12-24 Setton Jack Enceinte acoustique perfectionnee
US4031318A (en) * 1975-11-21 1977-06-21 Innovative Electronics, Inc. High fidelity loudspeaker system
US4450322A (en) * 1981-11-02 1984-05-22 Wilson David A Adjustable speaker system and method of adjustment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3824343A (en) * 1972-11-29 1974-07-16 J Dahlquist Multiple driver dynamic loud speaker
US3927261A (en) * 1972-11-29 1975-12-16 Jon G Dahlquist Multiple driver dynamic loud speaker
FR2312909A1 (fr) * 1975-05-26 1976-12-24 Setton Jack Enceinte acoustique perfectionnee
US4031318A (en) * 1975-11-21 1977-06-21 Innovative Electronics, Inc. High fidelity loudspeaker system
US4450322A (en) * 1981-11-02 1984-05-22 Wilson David A Adjustable speaker system and method of adjustment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006397A1 (en) * 1993-08-20 1995-03-02 Centralforce Limited Loudspeaker
DE19844552A1 (de) * 1998-09-29 2000-05-31 Helmut Kremer Permanent-Dynamischer Lautsprecher mit zylindrischer Abstrahlung
DE19844552B4 (de) * 1998-09-29 2006-06-01 Helmut Kremer Lautsprechergehäuse für Mitteltief- Mittelhoch- und Hochtöner mit zylindrischer Abstrahlung

Also Published As

Publication number Publication date
FR2609853A1 (fr) 1988-07-22
FR2609853B1 (fr) 1989-04-21

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