EP2139266A1 - Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt - Google Patents

Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt Download PDF

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Publication number
EP2139266A1
EP2139266A1 EP08290597A EP08290597A EP2139266A1 EP 2139266 A1 EP2139266 A1 EP 2139266A1 EP 08290597 A EP08290597 A EP 08290597A EP 08290597 A EP08290597 A EP 08290597A EP 2139266 A1 EP2139266 A1 EP 2139266A1
Authority
EP
European Patent Office
Prior art keywords
power supply
transducer
bass
motor
excitation
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.)
Ceased
Application number
EP08290597A
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English (en)
French (fr)
Inventor
Arnaud Cazes-Bouchet
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.)
Focal-Jmlab (Sa)
Focal JMLab SAS
Original Assignee
Focal-Jmlab (Sa)
Focal JMLab SAS
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 Focal-Jmlab (Sa), Focal JMLab SAS filed Critical Focal-Jmlab (Sa)
Priority to EP08290597A priority Critical patent/EP2139266A1/de
Publication of EP2139266A1 publication Critical patent/EP2139266A1/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Definitions

  • the present invention relates to the technical field of loudspeakers, in particular high and very high-end speakers and in particular their component type bass transducer for loudspeakers speakers.
  • the "serious" transducer is a very important element in the design of any acoustic reproduction system.
  • the role of the bass is to cover the frequency band in which we find the first harmonics between 20 and 250 Hz.
  • the human ear being a "transient type” sensor, it is the perception of all harmonics that will give sound restored all its finesse, its definition, without dragging or "coloring".
  • This bass transducer indeed is particularly sensitive to high-level dynamic compression, dragging, and can present very strong colorations if it is poorly studied.
  • a loudspeaker can reproduce the entire audible band by the human ear (from 20 to 20 kHz) with a particularly low level of distortion while maintaining high performance.
  • the bass was distributed between two speakers, one of very large diameter loaded in a large volume to reproduce the extreme-bass (frequency lower than 70 Hz) and a second speaker smaller for the high-bass (70 Hz to 250 Hz).
  • the bass is very sensitive to the listening room, because the sound generated by the bass transducer has wavelengths fairly close to the dimensions of the room. This generates nodes and pressure bellies degrading very seriously the quality of bass.
  • FOCAL TM decided to engage more recently a centered approach this time on the possibility of adjusting the level of the transducer. serious to reproduce the frequencies lower than 70 Hz to adapt the speaker to these two external factors which are the room and the amplifier.
  • FOCAL TM did not wish to use a globally known solution, that is to say an active electronics (besides with sometimes dubious qualities, much criticized by the audiophiles), but rather of to act in his research with a radically original approach directly at the level of the bass transducer using an excitation motor (that is to say motor employing an electromagnet).
  • One of the objectives of the present invention is to achieve the creation of a bass transducer capable of providing a level-adjustable bass level, employing an excitation motor while maintaining a high quality level, and solving the known problems of such an engine, and while achieving extreme simplicity of use.
  • the speakers equipped with an active analog filter thus offer the possibility of modifying the level of bass or correcting defects of the speaker. But the signal is then degraded by the passage in a multitude of electronic correction circuits, sources of loss of information and therefore of transparency.
  • the power amplifier modules used for each of the transducers are very often of a very average quality.
  • the digital active filter reduces the number of circuits traversed by the signal by processing the corrections numerically.
  • the accuracy of the calculation comes into play and comes to limit the system with a defined number of decimals.
  • the signal is then converted from digital to analog.
  • transparency is a well-known concept that resides in the ability of a system to faithfully reproduce a sound without distortion, "coloration” or so-called “veil” effect, the coloring being, because of a reproduction not perfect, a very slight modification of the sound reproduced compared to the sound emitted, which, for an audiophile, gives an instrument a certain "coloration” different from the original.
  • the passive filters are positioned between the amplifier and the speaker. They offer adjustment possibilities to lower the level, but do not allow to gain level.
  • the Applicant offers on its speakers the possibility of use in "passive biamping". This consists in feeding the bass speaker with a second amplifier. This provides excellent features but requires the customer to purchase another amplifier with among other things the need for a gain adjustment. Filtering is always done by the speaker filter.
  • the interest of being able to modify the magnetic power of the transducer to vary the level of bass and also to modify the alignment (form of the frequency response to the high or low cut, here low, and which is related to the overvoltage of the coupled system (or QF quality factor)) was of great importance for the invention.
  • the magnetic field can also be more powerful than motors with permanent magnets.
  • transducer midrange, treble, bass, bass-bass, harmonic, harmonic range, bass-reflex, boost, power, power handling, performance, resonance, distortion, dragging, membrane, coloration (modifying the the exact sound of a given instrument by giving it, when passing through the transducer, a very slightly different "acoustic coloration", that the music lover detects), bandwidth, acoustic connection, coupling, alignment, transparency (ability to make the sound with perfection and no detectable effect of sail), point source, cutoff, "waterfall” (response curve (in symbolic form of "waterfall”) in frequency in time: the extinction of a given frequency - and all the frequencies of the band - must be as fast as possible, not “dragging", and must be ideally instantaneous, that is to say without "extinction accidents” and thus without bringing "coloration to a given instrument ) and analogs are well known to those skilled in the art and will not be otherwise defined herein. This is general knowledge of the skilled person.
  • Another objective to be achieved in the chosen route of research has been to design a motor excitation no longer has the known drawbacks, including intense heating incompatible with a mainstream production.
  • the invention relates to both a new bass driver, a new excitation motor and also a new use (or mode of use) of this transducer with a "force factor" BL very much higher (at least doubled in general) compared to what is known to achieve in the prior art, in particular of the order of 25 to 35 , in particular 27 and 34 with a prototype made, against a maximum of 25 in the prior art (this value of 25 only being achieved in the laboratory and at an exorbitant production cost and by achievements that are technically very complex and incompatible with "reasonable" high-end industrial production).
  • the Applicant has deliberately avoided the use of mechanical resonances which nevertheless artificially increase the sound level (especially using a high resonance frequency and "break up” (deformation of the membrane and possibly rupture) at 20 kHz not damped) but which generate a lot of dragging (the drag is the frequency response to the extinction of a sound: the extinction of the frequencies concerned should ideally be instantaneous, but we can note “extinction accidents” that is to say frequencies that are slow a little too much to go out; the corresponding frequency / time curve is called “waterfall”).
  • the invention manages in this difficult context to achieve a "quantum leap”.
  • the Applicant has noted that when the excitation motor is supplied with 60 W continuously inside an enclosure, its temperature can rise very high in temperature, for example 97 ° C.
  • the thickness of the base plate thus passes according to the invention of 10 mm to 20 mm, and the section of the core passes of 22 mm at 28 mm.
  • Magnetic field intensity curve in the air gap of the motor obtained with an excitation power supply power of 90 W.
  • the magnetic field reaches 1.75 Tesla and 2.37e-5 Webers
  • the UNIQUE APPENDIX table summarizes the results: (temperature, magnetic field, HP performance, competing product).
  • the efficiency is much higher than the first version (prior art) of the engine since it required 60 W to obtain the magnetic field of the multiferrite against only 9 W for this new version according to the invention.
  • This new motor provides the same magnetic field with 2 times less electrical power applied.
  • Temperature resistance problems of the regulator have been measured: 70 - 80 ° C despite large radiators. This represents a significant risk of destruction of electronic components, incompatible with the manufacturer's ten-year warranty.
  • Ripples slightly higher than the regulated version have been measured (200 mV) but are acceptable. In addition, they can be further reduced by increasing the filtering capabilities.
  • This passive power supply has the advantage of not heating up and withstanding electrical overvoltages.
  • the Applicant has deliberately discarded the well-known and advantageous solution of switching power supplies for the following reasons: electrical noise, less reliable power supplies than traditional power supplies.
  • An electrical signal detector detects the "presence” of the sound and allows the automatic switching on of the motor supply. It also stops after 15 minutes of inactivity.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP08290597A 2008-06-23 2008-06-23 Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt Ceased EP2139266A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08290597A EP2139266A1 (de) 2008-06-23 2008-06-23 Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08290597A EP2139266A1 (de) 2008-06-23 2008-06-23 Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt

Publications (1)

Publication Number Publication Date
EP2139266A1 true EP2139266A1 (de) 2009-12-30

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EP08290597A Ceased EP2139266A1 (de) 2008-06-23 2008-06-23 Neuer Signalwandler von tiefen Tönen mit Erregungsmotor für Lautsprecher in Lautsprecherboxen, der eine Anpassung der Kopplung zwischen dem Lautsprecher und dem jeweiligen Raum der Audioausstrahlung erlaubt

Country Status (1)

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EP (1) EP2139266A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2515098A (en) * 2013-06-14 2014-12-17 Jaguar Land Rover Ltd Speaker device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976868A (en) * 1931-12-18 1934-10-16 Rca Corp Sound translating device
US2295483A (en) * 1934-06-04 1942-09-08 Jensen Radio Mfg Company Loudspeaker
US4896360A (en) * 1987-05-27 1990-01-23 Knight Robert S Public address amplifier
US6639994B1 (en) * 2000-08-16 2003-10-28 Jl Audio, Inc. Loudspeaker having adjustable motor strength

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976868A (en) * 1931-12-18 1934-10-16 Rca Corp Sound translating device
US2295483A (en) * 1934-06-04 1942-09-08 Jensen Radio Mfg Company Loudspeaker
US4896360A (en) * 1987-05-27 1990-01-23 Knight Robert S Public address amplifier
US6639994B1 (en) * 2000-08-16 2003-10-28 Jl Audio, Inc. Loudspeaker having adjustable motor strength

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2515098A (en) * 2013-06-14 2014-12-17 Jaguar Land Rover Ltd Speaker device
GB2515098B (en) * 2013-06-14 2016-02-03 Jaguar Land Rover Ltd Speaker device
US10009692B2 (en) 2013-06-14 2018-06-26 Jaguar Land Rover Limited Speaker device

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