FR2480056A1 - Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve - Google Patents

Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve Download PDF

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Publication number
FR2480056A1
FR2480056A1 FR8007806A FR8007806A FR2480056A1 FR 2480056 A1 FR2480056 A1 FR 2480056A1 FR 8007806 A FR8007806 A FR 8007806A FR 8007806 A FR8007806 A FR 8007806A FR 2480056 A1 FR2480056 A1 FR 2480056A1
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FR
France
Prior art keywords
loudspeaker
circular
sleeve
woofer
holes
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Withdrawn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
FR8007806A
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French (fr)
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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
Priority to FR8007806A priority Critical patent/FR2480056A1/en
Publication of FR2480056A1 publication Critical patent/FR2480056A1/en
Withdrawn legal-status Critical Current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; 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
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers

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

Abstract

A loudspeaker cabinet has a number of precise cylindrical openings provided in a baffle and angularly spaced about the loudspeaker on a circle whose dia. is greater than that of the loudspeaker. Each opening has a sleeve of P.V.C. glued in the opening with a tube of the same material telescopically engaged in the sleeve and extending into the cabinet. The degree to which the tube projects is adjusted and calculated as a function of the acoustic mass. The sleeve and tube may be of material other than P.V.C. with both being of the same material. The cabinet ensures an ideal distribution of low frequency sound while allowing optimum adjustment of the tuned frequency in construction.

Description

La présente invention a pour objet à titre de produit industriel nouveau, un dispositif créant une décompression circulaire ramenée autour du haut-parleur destiné à reproduire les fréquences graves, dans une enceinte acoustique. The present invention relates to, as a new industrial product, a device creating a circular decompression brought around the loudspeaker intended to reproduce the low frequencies, in an acoustic enclosure.

La membrane d'un haut-parleur engendre en se déplaçant deux pressions acoustiques déphasées de 1800. Les ondes acoustiques ARRIèRES sont, soit dans le cas de système clos, perdues en chaleur puisqu'elles restent dans 11 enceinte ce qui crée également des mouvements parasites de la membrane du haut-parleur, soit dans le cas de système à diffuseurs, canalisés vers ceux-ci afin d'en récupérer tout ou partie. The diaphragm of a loudspeaker generates, by moving two acoustic pressures out of phase with 1800. The REAR acoustic waves are, either in the case of a closed system, lost in heat since they remain in the enclosure, which also creates parasitic movements. of the speaker diaphragm, or in the case of a system with diffusers, channeled towards them in order to recover all or part of them.

Le dispositif, objet de la présente invention est remarquable en ce qu'il assure une répartition spatiale idéale des ondes arrières puisque se situant autour du haut-parleur des fréquences
GRAVES, tout en permettant un réglage optimal de la fréquence d'accord par construction.The device which is the subject of the present invention is remarkable in that it ensures an ideal spatial distribution of the rear waves since it is located around the frequency speaker.
BASS, while allowing optimal adjustment of the tuning frequency by construction.

Une forme d'exécution dede I'invention est décrite ci-après à titre indicatif en se référant aux dessins annexes. An embodiment of the invention is described below by way of indication with reference to the accompanying drawings.

La figure 1 est une vue de face du caisson de GRAVE d'une enceinte acoustique. Figure 1 is a front view of the GRAVE box of an acoustic enclosure.

La figure 2 est une vue en coupe du dispositif. Figure 2 is a sectional view of the device.

Le figure 3 représente le détail d'un des éléments du dispositif. Figure 3 shows the detail of one of the elements of the device.

Le dispositif est composé d'un nombre très précis d'ouvertures cylindriques, 1, se situant sur la face avant 2 de lten- ceinte acoustique et inscrites sur un diamètre supérieur au diamètre extérieur du haut-parleur. The device is composed of a very precise number of cylindrical openings, 1, located on the front face 2 of the acoustic speaker and written on a diameter greater than the outside diameter of the loudspeaker.

Chaque ouverture est garnie d'un manchon, 3, en PVC immobilisé par collage. Each opening is lined with a sleeve, 3, of PVC immobilized by gluing.

Dans chaque manchon et sur une longueur définie par calcul en fonction de la masse acoustique, donc de la surface nécessaire (longueur x circonférence développée) est ajusté un tube 4 de matière identique au manchon 3. In each sleeve and over a length defined by calculation as a function of the acoustic mass, therefore of the necessary surface (length × developed circumference), a tube 4 of material identical to the sleeve 3 is adjusted.

Il'ensemble de ces tubes réaliseront l'accord qui sera obtenu par réglage en fonction d'un calcul préalable. All of these tubes will achieve the agreement which will be obtained by adjustment according to a preliminary calculation.

I1 est bien entendu que la présente invention n'est pas limitée au mode de réalisation décrit et représenté qui constitue un exemple auquel de nombreuses variantes peuvent titre apportées sans pour autant s'écarter de la présente invention. It is understood that the present invention is not limited to the embodiment described and shown, which constitutes an example to which numerous variants can be made without departing from the present invention.

Le matériau utilisé peut entre différent du PVC, par exemple du carton fort ou tout autre matière, dans la mesure où elle n'est pas influencée par le champ magnétique existant au niveau du moteur du haut-parleur. The material used can be different from PVC, for example strong cardboard or any other material, insofar as it is not influenced by the magnetic field existing at the level of the motor of the loudspeaker.

Claims (1)

R E V E N D I C A T I o r, SR E V E N D I C A T I o r, S 1 - Dispositif qui crée une décompression circulaire ramenée autour du haut-parleur destiné à reproduire les fréquences GRAVES dans une enceinte acoustique, caractérisé par le fait que la décompression est assurée par des ou-ertures 2 réalisées sur le baffle et équipée chacune d'un manchon 3 dans lequel s'ajuste un tube d'accord 4. 1 - Device which creates a circular decompression brought back around the loudspeaker intended to reproduce the BASS frequencies in an acoustic enclosure, characterized by the fact that the decompression is ensured by openings 2 produced on the baffle and each equipped with a sleeve 3 into which a tuning tube 4 fits. 20- Dispositif selon la revendication I caractérisé par le fait que le réglage de la fréquence d'accord haut-parleur - coffre en fonction de la fréquence de résonnance propre du haut-parleur à l'air libre se réalise par la détermination du nombre de manchons et par oie de conséquence de la longueur des tubes d'accord, obtenue par réglage dans les manchons. 20- Device according to claim I characterized in that the adjustment of the loudspeaker - trunk tuning frequency as a function of the resonant frequency of the loudspeaker in the open air is achieved by determining the number of sleeves and consequently of the length of the tuning tubes, obtained by adjustment in the sleeves. 30- Dispositif selon la revendication 2 caractérisé par le fait que le nombre de tubes d'accord est variable en fonction des paramètres du haut-parleur qui sera toujours centré axialement afin de permettre un réglage précis et optimal de la fréquence deacc cord.  30- Device according to claim 2 characterized in that the number of tuning tubes is variable depending on the parameters of the speaker which will always be centered axially to allow precise and optimal adjustment of the deacc cord frequency.
FR8007806A 1980-04-04 1980-04-04 Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve Withdrawn FR2480056A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8007806A FR2480056A1 (en) 1980-04-04 1980-04-04 Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8007806A FR2480056A1 (en) 1980-04-04 1980-04-04 Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve

Publications (1)

Publication Number Publication Date
FR2480056A1 true FR2480056A1 (en) 1981-10-09

Family

ID=9240609

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8007806A Withdrawn FR2480056A1 (en) 1980-04-04 1980-04-04 Circular decompression unit for loudspeaker cabinet - has circular array of holes on baffle surrounding woofer each having adjustable tuning sleeve

Country Status (1)

Country Link
FR (1) FR2480056A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534437A1 (en) * 1982-10-09 1984-04-13 Int Standard Electric Corp Tuning device for bass reflex loudspeaker cabinet
FR2829349A1 (en) * 2001-09-03 2003-03-07 Francois Charlet High fidelity acoustic loudspeaker decompression technique having enclosure held low bass and upper high frequency loudspeaker clearing enclosure with enclosure attached conduits leaving decompression gap.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534437A1 (en) * 1982-10-09 1984-04-13 Int Standard Electric Corp Tuning device for bass reflex loudspeaker cabinet
FR2829349A1 (en) * 2001-09-03 2003-03-07 Francois Charlet High fidelity acoustic loudspeaker decompression technique having enclosure held low bass and upper high frequency loudspeaker clearing enclosure with enclosure attached conduits leaving decompression gap.

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