EP3596938B1 - Einteilige vorrichtung für eine angetriebene lautsprecherbox - Google Patents

Einteilige vorrichtung für eine angetriebene lautsprecherbox Download PDF

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Publication number
EP3596938B1
EP3596938B1 EP18714556.0A EP18714556A EP3596938B1 EP 3596938 B1 EP3596938 B1 EP 3596938B1 EP 18714556 A EP18714556 A EP 18714556A EP 3596938 B1 EP3596938 B1 EP 3596938B1
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EP
European Patent Office
Prior art keywords
loudspeakers
loudspeaker
speaker according
speaker
possibly
Prior art date
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Application number
EP18714556.0A
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English (en)
French (fr)
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EP3596938A1 (de
Inventor
Timothée Cagniard
Thierry Cagniard
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Cc Lab
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Cc Lab
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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 
    • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • 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
    • H04R9/06—Loudspeakers
    • H04R9/063—Loudspeakers using a plurality of acoustic drivers
    • 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
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure
    • 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
    • H04R3/14—Cross-over networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers

Definitions

  • the present invention relates to a one-piece amplified acoustic enclosure device.
  • the amplifier/speaker combination available does not generally allow this objective to be achieved either for lack of means: amplifier power (or batteries) too low, distortion rate in the important bass frequencies at high level, all coupled with speakers that are also too small.
  • Integrated servo systems make it possible to control the elongation of the membranes of the bass loudspeaker or, as described in the patent US 6,353,670 (GASNER DONALD R ), harmful resonances measured occasionally at certain frequencies inside the loudspeakers themselves. While increasing or reducing punctually the extent of the displacement of their membranes and thereby the sound level of the speakers in the low register, we manage to control these same displacements by limiting them at high power when their voice coil deviates too much of its magnetic field or when the sound level at certain frequencies causes undesirable internal resonance effects, so that any distortion or sound coloration can be contained permanently, whatever the listening level.
  • this is the passive radiator, which multiplies by two the radiation of the loudspeaker in the lower end of the sound spectrum and thus noticeably increases the sound level in this frequency range. But which also does not allow a high sound level to be supported without distortion.
  • this is a solution that makes it possible to reconcile these different advantages without their main disadvantages, described above.
  • the two loudspeakers control their possible excessive elongations and thereby allow, at an equivalent sound power level, to significantly reduce the distortion observed in the low frequencies. compared to that of a conventional loudspeaker of equivalent size.
  • a better sound level is also obtained in the low register than with a conventional closed load while maintaining, as for a vented speaker, a good level bandwidth in the bottom of the sound spectrum while remaining compatible with a resistance in power without distortion.
  • the loudspeakers of such a device are intended to be connected to a separate multi-purpose amplifier.
  • the rear loudspeaker connected to the audio output of the external amplifier, is connected with the front loudspeaker according to a parallel electrical diagram.
  • the front loudspeaker when it is relayed in frequencies towards the top of the sound spectrum only by tweeters, is responsible for reproducing in this classic configuration scheme the low register as well as the mid/high register.
  • the so-called rear loudspeaker whose cone is directed towards the rear of the front loudspeaker membrane and which is therefore not filtered separately, logically rises in frequency like the front loudspeaker, producing in the direction of the rear of the membrane of the latter, especially beyond 120 Hz, interference in the form of standing waves harmful to sound reproduction and sound clarity in the midrange of the entire system.
  • the two loudspeakers operate strictly in piston as well as in phase.
  • the pneumatic coupling of the two loudspeakers makes it possible to significantly reduce the overall distortion of the loudspeaker in the low frequencies, by reducing in this frequency range the travel of the two membranes at high power.
  • this threshold 120 - 150 Hz
  • the front loudspeaker which no longer functions as a piston, is out of phase with respect to the rear loudspeaker, thereby causing a level drop.
  • the front loudspeaker which has a small volume of air at the rear of its membrane, intrinsically resonates at a frequency significantly higher than that of the rear loudspeaker, which prevents it, while by consuming power unnecessarily, to be electrically active in the extreme bass, unlike the rear loudspeaker.
  • the double partition leads to an obligatory complication of the traditional cabinet-making scheme, to a larger and less watertight volume as well as to a complication of the assembly labor dedicated to this second internal loudspeaker.
  • the device that is the subject of the present invention while adopting this same arrangement of loudspeakers in tandem, aims to overcome all of the various disadvantages described above, as well as seizing the opportunity offered by recent technical possibilities in terms of powerful, compact and high-performance amplifications.
  • This device consists of a front loudspeaker (1) and a rear loudspeaker (2), mechanically coupled together via a small volume of air itself preferably delimited by a room link forming a watertight bulkhead (4) and connecting these two loudspeakers.
  • This connecting piece can be of complex shape, adapted to the geometry of said loudspeakers and manufactured possibly using injection, thermoforming or 3D printing techniques.
  • a vent (5) ensures the pneumatic connection between the outside air and the internal part of the enclosure located outside this sealed volume; a second vent (5') can also be provided as is apparent from the Figure 3 .
  • the rear loudspeaker (2) intrinsically has a lower resonance frequency than that of the front loudspeaker (1), the latter being loaded at the rear of its membrane by a minimum volume of air; but it can, according to one embodiment, also be designed for this purpose.
  • the device according to the invention also comprises an internal amplifier, preferably of class D, integrated into the enclosure. It consists of at least two channels (3) and (3') connected separately to each loudspeaker (1) and (2).
  • Each of these two amplified central channels is calibrated in order to allow a precise and differentiated modulation of their frequency ranges concerning the characteristics of each loudspeaker (1) and (2) and, where appropriate, of their respective sound levels.
  • This filtering makes it possible in particular, for example, and in this embodiment, to gradually reduce the level of the rear loudspeaker (2) above and from 70 Hz, as illustrated in the diagram of the Figure 5 , in order to avoid, as explained above, any negative interference from the rear loudspeaker (2) to the front loudspeaker (1).
  • each amplification channel (3), (3') can be attenuated in a differentiated manner by at least -6db below or around each resonance frequency of the two loudspeakers (1 ) and (2).
  • the device according to the invention allows an optimization of the feedback rate of the amplifier.
  • An external amplifier should be versatile and its feedback rate is high (usually around 1 volt for a gain of 2000).
  • By lowering the feedback rate of a standard amplifier it would be possible to obtain with traditional loudspeakers a widening of their bandwidth, but the loudspeakers of these loudspeakers would not fail to quickly saturate, distort, then deteriorate.
  • the device according to the invention makes it possible to circumvent this problem and to reduce the feedback rate of the dedicated amplifier for gain values substantially less than 1000 for 1 volt at the level of the channels (3), (3') while keeping speaker distortion low and sound more natural.
  • Two or four additional amplified channels, if any, will also make it possible to separately supply the loudspeakers specialized in the high frequencies (6) and (6') concerning the treble and possibly the midrange, as provided in a variant embodiment of the present invention.
  • the treble loudspeakers (6) and (6') and possibly midrange loudspeakers will be supplied separately by differentiated amplifier channels.
  • the variant of the Figure 1 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside an amplified one-piece enclosure of conventional architecture and equipped with a single vent (5) facing the rear of the 'pregnant ; to the Figure 2 , this vent (5) faces the front of said enclosure.
  • the variant illustrated in Figure 3 relates to a device in which the two loudspeakers (1) and (2) are schematically represented inside a one-piece enclosure amplified, equipped with a treble distribution system via the loudspeakers (6) and (6'), as well as two vents (5) and (5') facing the front of said enclosure.
  • an internal amplifier comprising at least two independent channels (3) (3'), the sound level of each channel of which is filtered and modulated in order to avoid any negative interaction between the two loudspeakers (1) and (2) and so that it can be raised significantly (by at least + 3 db) below frequencies situated around 200 Hz (low frequency register).
  • the power level of the channel which supplies the rear loudspeaker (2) within a frequency range situated between the resonance frequency of this loudspeaker (2) and possibly up to 200 Hz , is occasionally raised by at least +3db with respect to the average amplification power level of the loudspeakers.
  • These distinct amplification channels (3) and (3') each have their specific frequency band so that the frequency response curve of the rear loudspeaker (2) is progressively attenuated by at least 3db from and above a frequency range between 60 Hz and 120 Hz.
  • Each amplification channel (3), (3') is gradually attenuated and starting from each resonance frequency of the loudspeakers (1), (2).
  • the curve of the Figure 6 is the frequency response curve, after corrections, of the rear loudspeaker (2), of the front loudspeaker (1) as well as the representation (in dotted line) at the junction of these of their resulting curve.
  • the assembly can also incorporate loudspeakers (6) and (6') responsible for reproducing the high frequencies and possibly the mids, which can thus be placed either according to conventional loudspeaker diagrams ( Figure 1 and Figure 2 ) or possibly according to more complex schemes ( Figure 3 ).
  • the loudspeakers (6) and (6') responsible for restoring the high frequencies have been advantageously inclined upwards and positioned in an opposite direction from the loudspeakers (1) and (2) in order to benefit more advantageously to the set of a spatial effect.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Claims (9)

  1. Verstärkte Lautsprecherbox der Art, die Folgendes umfasst:
    * zwei Lautsprecher (1; 2), wobei einer (1) auf einer Vorderseite liegt, der dafür bestimmt ist, die mittleren und tiefen Frequenzen wiederzugeben, und der andere (2) in der Nähe und auf der Rückseite dessen angeordnet ist, der dafür bestimmt ist, die tiefen Frequenzen wiederzugeben, und die pneumatisch durch eine dichte Kammer (4) miteinander verbunden sind,
    * wenigstens ein Luftloch (5, 5'), das nicht mit der dichten Kammer pneumatisch in Verbindung steht und den inneren Teil der Box mit deren Äußerem verbindet, dadurch gekennzeichnet, dass jeder dieser zwei Lautsprecher (1) und (2) durch unterschiedliche Verstärkerkanäle (3) und (3') gespeist wird und jeweils sein spezifisches Frequenzband besitzt, so dass die Frequenzkurve des hinteren Lautsprechers (2) von und über einem Frequenzbereich, der zwischen 60 Hz und 120 Hz liegt, um wenigstens 3 dB schrittweise gedämpft wird.
  2. Box nach Anspruch 1, dadurch gekennzeichnet, dass jeder Verstärkerkanal unterhalb und ausgehend von jeder Resonanzfrequenz der Lautsprecher (1) und (2) schrittweise gedämpft wird.
  3. Box nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Leistungspegel des Kanals, der den hinteren Lautsprecher (2) speist, in einem Frequenzbereich, der zwischen der Resonanzfrequenz dieses Lautsprechers (2) und möglicherweise bis zu 200 Hz liegt, punktuell um wenigstens +3 dB relativ zu dem durchschnittlichen Verstärkerleistungspegel der Lautsprecher angehoben wird.
  4. Box nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jeder Verstärkerkanal (3), (3') auf differenzierte Weise um wenigstens -6 dB unter oder um jede Resonanzfrequenz der zwei Lautsprecher (1) und (2) gedämpft wird.
  5. Box nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Rückkopplung des inneren Verstärkers auf Werte kalibriert ist, die einem Verstärkungsgrad von weniger als 1000 für 1 Volt an den Kanälen (3), (3') entsprechen.
  6. Box nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der hintere Lautsprecher (2) eine niedrigere Resonanzfrequenz als die des vorderen Lautsprechers (1) besitzt.
  7. Box nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Lautsprecher (1) und (2) um zwei Hochton- (6) und (6') und gegebenenfalls Mitteltonlautsprecher ergänzt sind.
  8. Box nach Anspruch 7, dadurch gekennzeichnet, dass die Hochton- (6) und (6') und gegebenenfalls die Mitteltonlautsprecher getrennt von differenzierten inneren Verstärkerkanälen gespeist werden.
  9. Box nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Hochton-(6) und (6') und gegebenenfalls die Mitteltonlautsprecher in entgegengesetzter Richtung zu den Lautsprechern (1) und (2) ausgerichtet und nach oben geneigt sind.
EP18714556.0A 2017-03-16 2018-03-15 Einteilige vorrichtung für eine angetriebene lautsprecherbox Active EP3596938B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1700273A FR3064146B1 (fr) 2017-03-16 2017-03-16 Dispositif monobloc et stereophonique d'enceinte acoustique amplifiee
PCT/FR2018/000054 WO2018167386A1 (fr) 2017-03-16 2018-03-15 Dispositif monobloc d'enceinte acoustique amplifiée.

Publications (2)

Publication Number Publication Date
EP3596938A1 EP3596938A1 (de) 2020-01-22
EP3596938B1 true EP3596938B1 (de) 2022-05-11

Family

ID=59409369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18714556.0A Active EP3596938B1 (de) 2017-03-16 2018-03-15 Einteilige vorrichtung für eine angetriebene lautsprecherbox

Country Status (3)

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EP (1) EP3596938B1 (de)
FR (1) FR3064146B1 (de)
WO (1) WO2018167386A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2343388A1 (fr) * 1976-03-05 1977-09-30 Siare Enceinte acoustique perfectionnee
FR2625844A1 (en) * 1988-01-13 1989-07-13 Audio Design "Push-pull" loudspeaker acoustic system for chambers
US5374124A (en) * 1993-04-06 1994-12-20 Cass Audio, Inc. Multi-compound isobarik loudspeaker system
US6353670B1 (en) * 1996-07-02 2002-03-05 Donald R. Gasner Actively control sound transducer
ATE476064T1 (de) * 2002-03-05 2010-08-15 Audio Products Int Corp Lautsprecher mit geformtem ton feld
US20060147075A1 (en) * 2004-12-31 2006-07-06 Gingko Audio Loudspeaker comprising coaxially-disposed drivers
US20080285762A1 (en) * 2007-05-15 2008-11-20 Keiichi Iwamoto Point source speaker systems
TWI635753B (zh) * 2013-01-07 2018-09-11 美商杜比實驗室特許公司 使用向上發聲驅動器之用於反射聲音呈現的虛擬高度濾波器

Also Published As

Publication number Publication date
FR3064146A1 (fr) 2018-09-21
EP3596938A1 (de) 2020-01-22
FR3064146B1 (fr) 2020-02-21
WO2018167386A1 (fr) 2018-09-20

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