FR2507423A1 - Acoustic enclosure for hi=fi loudspeaker - has three linked chambers ensuring resonant frequency is above normal operating range - Google Patents

Acoustic enclosure for hi=fi loudspeaker - has three linked chambers ensuring resonant frequency is above normal operating range Download PDF

Info

Publication number
FR2507423A1
FR2507423A1 FR8111269A FR8111269A FR2507423A1 FR 2507423 A1 FR2507423 A1 FR 2507423A1 FR 8111269 A FR8111269 A FR 8111269A FR 8111269 A FR8111269 A FR 8111269A FR 2507423 A1 FR2507423 A1 FR 2507423A1
Authority
FR
France
Prior art keywords
loudspeaker
resonant frequency
speaker
box
chambers
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
Application number
FR8111269A
Other languages
French (fr)
Other versions
FR2507423B1 (en
Inventor
Marcel Rochet
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.)
MULIDINE SARL
Original Assignee
MULIDINE SARL
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 MULIDINE SARL filed Critical MULIDINE SARL
Priority to FR8111269A priority Critical patent/FR2507423B1/en
Publication of FR2507423A1 publication Critical patent/FR2507423A1/en
Application granted granted Critical
Publication of FR2507423B1 publication Critical patent/FR2507423B1/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers

Abstract

The hi-fi loudspeaker structure includes a tradditional electro-dynamic speaker mechanism mounted in the front panel of a casing. The casing includes a number of interconnecting chambers so that the resonant frequency of the assembly is higher than that of the passband of the loudspeaker (greater than or equal to 15,000 Hz). The chamber immediately behind the loudspeaker communicates with the next chamber by a number of small pipes of flexible plastic. These have length and diameter chosen to make it possible for hypersonic waves to be transmitted, the sum of their cross-sections being related to the radiating area of the loudspeaker. The pipes are perforated along their length by small holes to tune them to more than 20kHz.

Description

La pressente invention concerne les enceintes acoustiques Haute fidélité qui pourront par ce procédé retransmettre avec la plus grande vérité tout signal electrique d'origine musical. Aucune vibration parasite de l'air de l'enceinte ne venant modifier le signal de la source.The present invention relates to high fidelity loudspeakers which can by this process retransmit with the greatest truth any electrical signal of musical origin. No parasitic vibration of the air of the enclosure modifying the signal of the source.

Toute enceinte acoustique est un instrument de musique, le ou les haut-parleurs reçoivent des ondes electriques qu'ils transforment en ondes sonores. L'enceinte sur laquelle sont montés les haut-parleurs réagit en créant des ondes parasites d'origine mécanique ou fluidique. Les premières peuvent être facilement éliminées, les secondesn'ont été que plus ou moins atténuées.Any acoustic enclosure is a musical instrument, the speaker (s) receive electric waves which they transform into sound waves. The enclosure on which the speakers are mounted reacts by creating parasitic waves of mechanical or fluidic origin. The former can be easily eliminated, the latter have only been more or less attenuated.

Le principe avancé aujourd'hui consiste à les supprimer complétement, de la même manière qu'avec un instrument de musique, une clarinette par exemple, nous choisissons une note en éliminant toutes les autres. Il suffit donc de faire vibrer l'air intérieur de l'enceinte à une fréquence non audible, ou tout au moins au dessus de la bande passante du haut parleur considéré, pour qu'il n'y ait plus d'ondes parasites dues à la caisse venant altérer l'image sonore originelle.The principle advanced today is to delete them completely, in the same way as with a musical instrument, a clarinet for example, we choose a note by eliminating all the others. It is therefore sufficient to vibrate the interior air of the enclosure at a frequency that is not audible, or at least above the passband of the speaker considered, so that there are no more parasitic waves due to the body altering the original sound image.

Le principe de base est le meme pour les haut-parleurs des graves que les hautparleurs des médium-aigus, mais la technologie en est un peu différente. Nous pouvons accepter un court-circuit acoustique entre les 2 faces d'un haut-parleur médium, donc la caisse peut être ouverte. Par contre, si nous voulons oh tenir des extrêmes graves jusqu'à IO Hz, les 2 faces du Haut-parleur doivent être totalement isolées. I1 faudra donc utiliser un deuxième caisson à l'avant du haut-parleur pour créer cette résonnance haute fréquence et absorber toute résonnance audible venant du caisson arrière; le caisson avant étant prioritaire puisque c'est lui qui émet dans le local d'écoute l'onde générée par le haut-parleur.La charge avant est donc la principale et l'effet obtenu est assez remarquable.L'enceinte ne fait plus apparaître de résonnance importante dans le grave. Effet visible sur la courbe Impédence/ Fréquence Fig I comparé aux autres systèmes connus: baffles clés ou reflex Fig 2 charge symétrique Fig. 3 reflex 2 chambres Fig 4.The basic principle is the same for the bass speakers as the mid-treble speakers, but the technology is a little different. We can accept an acoustic short circuit between the 2 faces of a midrange speaker, so the case can be opened. On the other hand, if we want to keep bass extremes down to 10 Hz, the 2 sides of the loudspeaker must be completely isolated. I1 must therefore use a second box at the front of the speaker to create this high frequency resonance and absorb any audible resonance coming from the rear box; the front subwoofer is a priority since it is he who emits the wave generated by the loudspeaker in the listening room. The front load is therefore the main one and the effect obtained is quite remarkable. appear significant resonance in the bass. Visible effect on the Impedence / Frequency curve Fig I compared to other known systems: key baffles or reflex Fig 2 symmetrical load Fig. 3 reflex 2 bedrooms Fig 4.

SOLUTION TECHNOLOGIQUE: donnée au haut-parleur médium
L'enceinte acoustique est un caisson divisé en 3 chambres minimum. La Fig 5 nous montre un exemple à 4 chambres. Le haut-parleur I est monté la face 2 la chambre 3 est la plus petite possible, elle communique avec la chambre 4 par l'intermédiaire d'un nombre important de petits tuyaux 5 en plastique souple, de longueur et diamètre adéquat pour créer une onde possible hypersonique.La somme des sections des tubes doit être relative à la surface émissive du haut-parleur.
TECHNOLOGICAL SOLUTION: given to the mid-range speaker
The acoustic enclosure is a box divided into at least 3 rooms. Fig 5 shows an example with 4 chambers. The loudspeaker I is mounted on the face 2, the chamber 3 is as small as possible, it communicates with the chamber 4 via a large number of small flexible plastic pipes 5, of adequate length and diameter to create a possible hypersonic wave. The sum of the sections of the tubes must be relative to the emissive surface of the loudspeaker.

Les tuyaux 5 sont perforés sur leur longueur de petits trous en des points adéquat pour obtenir l'accord à plus de 20.000 Hz. The pipes 5 are perforated along their length with small holes at suitable points to obtain agreement at more than 20,000 Hz.

L'air s'échappant par les trous des tuyaux 5 se détend dans la chambre 6 qui elle-même est décompressée par l'évent 7.The air escaping through the holes in the pipes 5 expands in the chamber 6 which itself is decompressed by the vent 7.

Les chambres 4 et 8 ont un volume en rapport avec la coupure basse du haut
court parleur, pour contrôler le circuit acoustique. Plus le volume total est grand plus le volume de chaque chambre petit, plus le nombre de chambres est important, plus le système est efficace.
Chambers 4 and 8 have a volume related to the lower cutoff at the top
short speaker, to control the acoustic circuit. The larger the total volume, the smaller the volume of each room, the more rooms, the more efficient the system.

SOLUTION TECHNOLOGIQUE donnée au Haut Parleur Grave
Comme pour le médium, l'enceinte comporte plusieurs chambres avec la même règle d'éfficacité. Maisnous voulons obtenir des sons jusqu a IO Hz, aussi il faut éliminer tout- court-circuit acoustique entre les deux faces du haut-par leur Exemple Fig.6
Le système est à double caisson, chacun étant en multichambre règle précédente). Mais le caisson avant a la forme d'un tube long ouvert aux 2 bouts par des évents I et 2 de section adéquate, le haut-parleur 3 étant placé assez près de l'évent principal I pour accorder ce tube à une fréquence haute (supérieure à 200 Hz.)
Le volume des deux caissonsavant et arrière et la section des évents est en relation avec la surface émissive du haut-parleur.
TECHNOLOGICAL SOLUTION given to the Bass Speaker
As with the medium, the enclosure has several rooms with the same efficiency rule. But we want to obtain sounds up to 10 Hz, so we must eliminate any acoustic short-circuit between the two faces of the loudspeaker by their example Fig.6
The system is double box, each one being in multi-room previous rule). But the front box has the form of a long tube open at both ends by vents I and 2 of adequate section, the speaker 3 being placed close enough to the main vent I to tune this tube at a high frequency ( greater than 200 Hz.)
The volume of the two front and rear boxes and the section of the vents is related to the emissive surface of the loudspeaker.

Courbe Amplitude/ Fréquence d'un tel ensemble Fig.7 , la bande passante reste plate jusqu'à IO Hz, le Haut-parleur fonctionne réellement en piston sur toute sa bande passante. Amplitude / Frequency curve of such an assembly Fig. 7, the bandwidth remains flat up to IO Hz, the loudspeaker actually works as a piston over its entire bandwidth.

Claims (3)

REVENDICATIONS 1 Enceinte acoustique hifi à chambres antirésonnantes utilisant un haut parleur electroàynamique traditionnel ltig.5 mont sur la paroi 2 d'un caisson. Caractérisée par le fait qu'elle colporte plusieurs chambres par caisson (3 minimum),de telle sorte que la fréquence de résonnance de l'ensemble soit supérieure à la bande passante du haut parleur. 1 Hifi acoustic speaker with anti-resonant chambers using a traditional electro-dynamic speaker ltig.5 mounted on the wall 2 of a box. Characterized by the fact that it peddles several chambers per box (minimum 3), so that the resonant frequency of the assembly is greater than the passband of the loudspeaker. 2 Ehceinte acoustique hifi selon la revendication 1, caracté- -risde par l'adjonction d'un nombre important de petits tubes 5 hypersoniques reliant les chambres 3,4 et 6 entre ellestde telle sorte que la fréquence de résonnance du caisson soit supérieure ou égale à 15000Hz. 2 hi-fi acoustic speaker according to claim 1, characterized by the addition of a large number of small hypersonic tubes 5 connecting the chambers 3, 4 and 6 between them so that the resonant frequency of the box is greater than or equal at 15000Hz. Un caisson est clos, l'autre est émissif. La forme des chambres, la forme et la position des évents 1 et 2 fig. 6 sont choisis de telle sorte que la fréquence de résonnance de l'ensemble soit supérieure ou égale à 300Hz One box is closed, the other is emissive. The shape of the chambers, the shape and the position of the vents 1 and 2 fig. 6 are chosen so that the resonant frequency of the set is greater than or equal to 300Hz 3 Enceinte acoustique hifi selon la revendication 1,caract- -risée par la présence de deux caissons reliés entre eux par le haut parleur 3 fig. 6, monté sur la paroi commune aux deux caissons, 3 hifi acoustic enclosure according to claim 1, characterized by the presence of two boxes connected together by the speaker 3 fig. 6, mounted on the wall common to the two boxes,
FR8111269A 1981-06-04 1981-06-04 HIFI ACOUSTIC SPEAKER WITH ANTIRESONANT CHAMBERS BY VOLUNTARY CREATION OF HIGH HARMONICS Expired FR2507423B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8111269A FR2507423B1 (en) 1981-06-04 1981-06-04 HIFI ACOUSTIC SPEAKER WITH ANTIRESONANT CHAMBERS BY VOLUNTARY CREATION OF HIGH HARMONICS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8111269A FR2507423B1 (en) 1981-06-04 1981-06-04 HIFI ACOUSTIC SPEAKER WITH ANTIRESONANT CHAMBERS BY VOLUNTARY CREATION OF HIGH HARMONICS

Publications (2)

Publication Number Publication Date
FR2507423A1 true FR2507423A1 (en) 1982-12-10
FR2507423B1 FR2507423B1 (en) 1988-02-19

Family

ID=9259284

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8111269A Expired FR2507423B1 (en) 1981-06-04 1981-06-04 HIFI ACOUSTIC SPEAKER WITH ANTIRESONANT CHAMBERS BY VOLUNTARY CREATION OF HIGH HARMONICS

Country Status (1)

Country Link
FR (1) FR2507423B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489551A2 (en) * 1990-12-03 1992-06-10 Bose Corporation Loudspeaker system having multiple subchambers
EP2690885A3 (en) * 2012-07-23 2015-10-07 Uniwersystet Slaski w Katowicach Acoustic speakers

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR971517A (en) * 1940-09-05 1951-01-18 Csf Improvements to acoustic damping devices
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
FR1142754A (en) * 1956-02-18 1957-09-23 Improvements in acoustic enclosures for loudspeakers
FR1211638A (en) * 1957-09-10 1960-03-17 Philips Nv Damping device, in particular for acoustic applications
FR1587761A (en) * 1968-09-27 1970-03-27
US3690405A (en) * 1971-02-24 1972-09-12 Edwin A Hance Loudspeaker system having bass response range below system resonance
FR2291675A1 (en) * 1974-11-18 1976-06-11 Elipson Loud-speaker enclosure - has main section with loud-speaker and two tuned complementary sections to improve acoustic characteristics

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR971517A (en) * 1940-09-05 1951-01-18 Csf Improvements to acoustic damping devices
US2689016A (en) * 1953-04-14 1954-09-14 Henry C Lang Sound reproducing system
FR1142754A (en) * 1956-02-18 1957-09-23 Improvements in acoustic enclosures for loudspeakers
FR1211638A (en) * 1957-09-10 1960-03-17 Philips Nv Damping device, in particular for acoustic applications
FR1587761A (en) * 1968-09-27 1970-03-27
US3690405A (en) * 1971-02-24 1972-09-12 Edwin A Hance Loudspeaker system having bass response range below system resonance
FR2291675A1 (en) * 1974-11-18 1976-06-11 Elipson Loud-speaker enclosure - has main section with loud-speaker and two tuned complementary sections to improve acoustic characteristics

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489551A2 (en) * 1990-12-03 1992-06-10 Bose Corporation Loudspeaker system having multiple subchambers
EP0489551A3 (en) * 1990-12-03 1993-04-14 Bose Corporation Loudspeaker system having multiple subchambers
EP2690885A3 (en) * 2012-07-23 2015-10-07 Uniwersystet Slaski w Katowicach Acoustic speakers

Also Published As

Publication number Publication date
FR2507423B1 (en) 1988-02-19

Similar Documents

Publication Publication Date Title
US6343134B1 (en) Loudspeaker and horn with an additional transducer
CN102396243B (en) Flat loudspeaker
JPH0970092A (en) Point sound source, non-oriented speaker system
FR2579400A1 (en) PRESSURE WAVE TRANSMISSION SYSTEM, NOTABLY APPLICABLE TO LOUDSPEAKERS
JPH07143588A (en) Vertical array type speaker equipment
EP0015186B1 (en) Three-channel acoustic system
US11076231B2 (en) Systems and methods for controlling plate loudspeakers using modal crossover networks
JP2009159104A (en) Panel for installing display device
US6038326A (en) Loudspeaker and horn with an additional transducer
US20190261087A1 (en) Speaker Cabinet to Effectively Amplify the Full and Natural Sound of an Acoustic Guitar
GB2101448A (en) Speaker system
JP2010504655A (en) Speaker and speaker system having tweeter array
JP2010504655A5 (en)
JP2004221742A (en) Piezoelectric speaker, speaker system employing the same, and electronic apparatus employing the piezoelectric speaker
FR2507423A1 (en) Acoustic enclosure for hi=fi loudspeaker - has three linked chambers ensuring resonant frequency is above normal operating range
US4276446A (en) Acoustic transducer system
JPH09135489A (en) Coaxial speaker and coaxial all horn speaker
JP4701614B2 (en) Cabinet for array speaker and array speaker system
JP2004343229A (en) Omnidirectional speaker system
US9247339B2 (en) Loudspeaker design
JPH0764582A (en) On-vehicle sound field correcting device
JP2017175417A (en) Acoustic reproducing device
JP2004320207A (en) Speaker system
JP2563086Y2 (en) Speaker device
KR20230057307A (en) asymmetric speaker system

Legal Events

Date Code Title Description
ST Notification of lapse