WO2014023912A1 - Enceinte bass-reflex à évent échancré - Google Patents
Enceinte bass-reflex à évent échancré Download PDFInfo
- Publication number
- WO2014023912A1 WO2014023912A1 PCT/FR2013/051895 FR2013051895W WO2014023912A1 WO 2014023912 A1 WO2014023912 A1 WO 2014023912A1 FR 2013051895 W FR2013051895 W FR 2013051895W WO 2014023912 A1 WO2014023912 A1 WO 2014023912A1
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- WO
- WIPO (PCT)
- Prior art keywords
- vent
- enclosure
- notch
- inlet
- envelope
- Prior art date
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- 238000005192 partition Methods 0.000 claims description 72
- 238000007373 indentation Methods 0.000 claims description 37
- 230000000295 complement effect Effects 0.000 claims description 11
- 230000001154 acute effect Effects 0.000 claims description 7
- 238000012886 linear function Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 description 24
- 230000004044 response Effects 0.000 description 7
- 238000005259 measurement Methods 0.000 description 3
- 230000010363 phase shift Effects 0.000 description 3
- 230000011514 reflex Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Classifications
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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
- H04R1/2823—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
-
- 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
-
- 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
-
- 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
-
- 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
- H04R1/323—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only for loudspeakers
Definitions
- the present invention relates to an acoustic enclosure, and more particularly to a vent enclosure, also called “bass-reflex" enclosure.
- such a speaker comprises, in addition to a loudspeaker, a vent for increasing the efficiency of the radiation in the lowest frequencies (typically between 20 Hz (hertz) and 200 Hz) relative to a closed speaker, it is ie without vent.
- Some speakers may include multiple speakers, and / or multiple vents to increase low frequency power.
- a bass reflex type enclosure therefore has two types of radiating surfaces, namely firstly a vent (or more) which radiates over a tuning frequency f c (EV curve), and secondly a speaker (or more) whose radiation exceeds that of the (or) vents beyond a contribution limit frequency f L (HP curve), as shown in Figure 5.
- These two frequencies f c and fi_ are determined by the dimensions of the vent and the enclosure.
- the loudspeaker and the vent radiate in phase which increases the efficiency of the radiation, while below this, the loudspeaker and the vent radiate in opposition in FIG. 5, in that a curve S representing the sum of the contributions of the loudspeaker and the vent passes above the curves EV and HP from the frequency f c .
- a vent is generally composed of an envelope, formed of one or more partitions, having an inlet and an outlet and defining an internal volume of the vent.
- the inlet is located in the enclosure and the outlet is constituted by an opening formed in a wall of the enclosure, that is to say a hole or a cut in a wall of the enclosure.
- the outlet often has a circular or rectangular shape, and the envelope is traditionally cylindrical, in the sense that the vent has a section constant along an axis connecting the input and the output, whatever the shape of this section.
- the envelope of the vent may in particular be at least partially constituted by at least a portion of a wall of the enclosure.
- Sizing an enclosure involves solving a system of equations to determine the vibratory velocities of the vent and loudspeaker as a function of the frequency of sound to be transmitted, as well as the two resonance frequencies (and f 2 ) of the system. and the tuning frequency (f c ) located between these two resonant frequencies.
- These two resonant frequencies fi and f 2 are characteristic of a system with two degrees of freedom, where the two unknowns for the bass reflex are venting speed and the speed of the speaker.
- the sizing of the enclosure requires consideration of the phase shift between the speaker and the vent radiation, resulting in a significant alteration of the directivity function in a plane including the vent and the speaker .
- the use of in-phase sources induces a narrowing of the angular coverage but an increase of the efficiency of the radiation in this range of coverage, while the use of non-phase sources implies a widening of the angular coverage but a degradation of the effectiveness of the radiation. This phenomenon is all the more marked at the frequencies of resonances f r .
- the present invention therefore aims to limit or even avoid peaks in the response of the vent related to the resonance frequencies f r so that the frequency response of the assembly, that is to say the enclosure, is the flatter possible, and that the radiation depending on the orientation relative to the enclosure is, as much as possible, independent of the frequency.
- an acoustic enclosure comprising at least one loudspeaker and at least one vent, the vent having an outlet formed in a wall of the enclosure, preferably a face before, an inlet interior to the enclosure, and an envelope connecting the inlet and the outlet, wherein the inlet of the vent has at least one notch in the envelope, for example formed by at least one edge of the 'envelope.
- the outlet of the vent may have any type of shape, preferably a circular or rectangular shape, or even square.
- the envelope is advantageously formed of at least one partition, and defines an internal volume of the vent.
- the internal volume of the vent advantageously comprises at least one wall, dividing the volume internal in sub-volumes, allow to confer more rigidity to the envelope of the vent.
- notch a cutout, an opening, formed in the envelope, located in the enclosure, initiated from the inlet of the vent, which forms its root, and extending towards the outlet, this which defines its end.
- An indentation is formed by at least one edge of the envelope in contact with any other element, that is to say, remote from this other element by a distance, measured at its root, not zero. This distance is called here at the root “initial width" of the notch.
- the indentation is preferably formed on the one hand by the edge of the envelope, and on the other hand with another element which is, for example, either another edge formed in the envelope or, for example, a wall of the enclosure.
- a notch has two edges, each edge extending between the end of the notch to the inlet of the vent, regardless of the shape of the end.
- the initial width of the indentation is determined by following the shape of the envelope between at least the root of the edge and the other element. That is, for example, in a case where the initial width of the notch is half a circumference of a tubular vent, the notch then comprises two edges each with a root at one end of the vent, the initial width is the length of the arc of a part of the dummy envelope, that is to say a part of an edge defining the input that was present before cutting to form the notch, and not a diameter or length of rope that would join the two roots of the notch.
- the width is the distance between the root and the other element, or both roots if any, in the plane of the envelope.
- the notch is formed on a flat wall of the envelope.
- the vent is thus for example formed so that the plane partition cooperates with walls of the enclosure so as to form the entire envelope which simplifies the realization of such a vent.
- the notch has a depth p, and a width defined by the distance between its two edges in a direction orthogonal to its depth p, variable according to the depth p, that is to say, a width that varies between its root and its end.
- depth p a dimension of the notch between its root and its end, orthogonal to its width, measured along a length L of the vent, that is to say the length of its envelope, the length L of the vent being defined here by the maximum distance between its inlet and its outlet.
- the width has a maximum at the inlet of the vent defining an initial width of the notch, so that its width at the end is much smaller than the initial width, or even zero in the sense that the end of the notch thus forms a point. It is then preferable that the edge of the indentation defines at its end an angle less than 180 °, or even less than 90 ° with the other element (for example another edge formed in the envelope or a wall of the enclosure ). In practice, the more the shape is pointed and the better the acoustic result.
- the inlet of the vent is then formed at least in part by the edge of the notch.
- the initial width of the indentation is equal to a width of at least one partition of the envelope in which it is formed, the width of the partition corresponding to its dimension in a direction parallel to the width of the notch.
- the width then corresponds to the perimeter of the vent.
- the inlet of the vent is then entirely defined by the notch.
- the indentation thus makes it possible to limit the phase shift induced between the loudspeaker and the vent at resonant frequencies f r , which results in a smoothing of the frequency response instead of marked peaks as in the case of a vent classic.
- the angular radiation has a better constancy as a function of the frequency, by suppressing higher order resonant frequencies.
- the depth p of the indentation is equal to a quarter of the wavelength corresponding to the first higher order resonant frequency f r i beyond the resonance frequency f2.
- the notch extends in length over at least a portion of the envelope, and preferably has a depth p less than the length L of the envelope.
- the end of the notch and the outlet of the vent are preferably distinct.
- the length L of the vent as well as the depth p of the indentation are defined as a function of the tuning frequency f c and the resonant frequencies f r .
- the indentation has two edges, at least one edge of which is defined by a straight line along a surface of the envelope.
- the other element is then formed by a second edge cut in the envelope.
- the vent can be made by folding or extrusion. If it is made by folding, the straight cut of at least one edge of the notch is preferably made before folding.
- a straight edge makes it possible to make the notch very easily with a good result on the radiation.
- the indentation has two edges, at least one edge of which is defined by a curve along a surface of the envelope.
- the envelope of the vent is deformed for the establishment of the vent in the enclosure it is preferable that the curve is defined and cut before.
- the curve is preferably defined by a portion of hyperbola.
- a curved shape and even more advantageously according to an abovementioned hyperbole equation, makes it possible to improve the results obtained on radiation measurements, that is to say on the directivity function. This results in a more constant radiation as a function of frequency over the widest possible angular coverage, as well as a response in the axis of the more linear enclosure.
- the two edges of the notch are symmetrical with respect to a plane orthogonal to the envelope. This symmetry facilitates the realization of the vent and its assembly in the enclosure, while improving the acoustic response.
- the notch has a width at its end much smaller than the initial width.
- the indentation has a convex shape.
- a width of the indentation defined by the distance between its two edges in a direction orthogonal to its depth p, is furthermore narrower according to a non-linear function, giving the notch a curved shape.
- This shape allows both to have a wide indentation at its root while presenting a form as sharp as possible.
- an edge of the notch defines at one end of the notch an angle of less than 180 °, or even less than 90 °.
- two edges of the notch define between them an acute angle at the end of the notch.
- a width of the notch is increasingly narrow from a root to an end according to a non-linear function, giving the notch a curved shape.
- the inlet of the vent has several indentations, each with an end, preferably symmetrical with respect to at least one plane orthogonal to the envelope passing through their end.
- each of the indentations is then calculated for the different peaks each corresponding to a higher order resonant frequency, which further improves the acoustic response.
- the inlet of the vent has several identical indentations.
- the enclosure has two indentations formed in a partition which are symmetrical, in mirror, with respect to a median plane and orthogonal to the partition.
- an internal volume of the vent defined by the envelope of the vent advantageously comprises at least one wall, dividing the internal volume into sub-volumes, making it possible to confer more rigidity on the envelope of the wind.
- the casing of the vent (3) is cylindrical.
- the inlet is defined by at least the edges of the notch and by a complementary part.
- the complementary part is for example defined in a plane parallel to a plane comprising the outlet of the vent.
- one of the edges of the notch is formed by a wall of the enclosure.
- the two edges of the notch are formed in a wall of the casing of the vent.
- an acoustic enclosure comprising at least one loudspeaker and at least one vent, the vent being composed of an envelope formed of at least one partition, the envelope having an inlet and an outlet and defining an internal volume of the vent with the inlet located in the enclosure and the outlet constituted by an opening formed in a wall of the enclosure, and the vent comprising a notch extending into the partition.
- an acoustic enclosure comprising at least one loudspeaker and at least one vent, the vent being composed of an envelope formed of at least one partition, the envelope having an inlet and an outlet and defining a volume internal vent with the inlet located in the enclosure and the outlet constituted by an opening formed in a wall of the enclosure, the vent comprising a notch extending in the partition, the notch being formed of two straight edges extending from the inlet and joined at one end, the two edges of the notch defining at the end an acute angle.
- Is also proposed an acoustic enclosure comprising at least one speaker and at least one vent, the vent being composed of an envelope, formed of at least one partition, the envelope having an inlet and an outlet and defining a volume internal of the vent with the inlet located in the enclosure and the outlet constituted by an opening formed in a wall of the enclosure, and the vent comprising a notch extending in the partition, the notch being formed of two curved edges extending from the inlet and joined at one end, the two edges of the notch defining between them a width of the notch which is narrower and narrower according to a non-linear function, giving the notch a curved shape.
- an acoustic enclosure comprising at least one loudspeaker and at least one vent, the vent being composed of an envelope formed of at least one partition, the envelope having an inlet and an outlet and defining a volume internal of the vent with the inlet located in the enclosure and the outlet constituted by an opening formed in a wall of the enclosure, the vent comprising a notch extending in the partition, the notch being formed of two edges extending from the inlet and joined to a pointed end.
- one comprises two identical sub-enclosures each comprising two loudspeakers and at least one vent as described. previously.
- Each sub-enclosure is an enclosure having all or some of the features described above.
- the vent envelope of each sub-enclosure defines an internal volume of the vent that includes two walls dividing the internal volume into three sub-volumes.
- FIG. 1 shows an isometric view of an enclosure with a standard vent
- FIG. 2 represents the enclosure of FIG. 1 seen from the front
- FIG. 3 shows the enclosure of Figure 1 seen from above;
- FIG. 4 is a graph showing the electrical impedance of a loudspeaker in a traditional bass-reflex enclosure, ie with a standard vent;
- FIG. 5 represents the radiation of the vent (EV) and of the loudspeaker (HP), and their sum (S) for a traditional bass-reflex loudspeaker;
- FIG. 6a, 6b, and 6c illustrate the directivity of a bass-reflex enclosure with a traditional vent to the tuning frequency f c respectively, and the resonance frequency f r and i;
- FIG. 7 shows a bass-reflex enclosure with a vent according to the invention according to a first embodiment
- Figure 8 shows a section of the enclosure of Figure 7
- FIG. 9 shows a bass-reflex enclosure with a vent according to the invention according to a second exemplary embodiment
- FIG. 10 represents a parallelepipedic vent according to the invention with a V-shaped notch, that is to say with two straight edges;
- FIG. 11 shows a parallelepipedal vent according to the invention with a convex notch
- FIG. 12 represents a parallelepipedic vent according to the invention with two identical recesses, convex, and symmetrical with respect to a median plane of the vent;
- FIG. 13 represents a circular section cylindrical vent according to the invention with a convex notch
- FIGS. 14a to 14h show directivity diagrams, at 160 Hz, 200 Hz, 250 Hz, 315 Hz, 400 Hz, 500 Hz, 630 Hz and 800 Hz respectively, for a standard vent (in dotted lines) and a vent with an indentation according to the invention (solid line);
- FIG. 15 represents the angular coverage at -6 dB (decibels) for a standard vent (in dotted lines) and a vent according to the invention (in solid lines);
- FIG. 16 shows an isometric view of an exemplary embodiment of an enclosure according to the invention.
- a traditional bass reflex speaker 1 generally has a parallelepiped shape as shown in particular in Figure 1, but any type of shape would be appropriate.
- height of the enclosure 1 is defined as the dimension of the enclosure defined between an upper face 11 and a lower face 12.
- the enclosure 1 has a front face 15 on which are positioned a loudspeaker 2 and a vent 3 A rear face 14 is opposed to the front face 15.
- the enclosure 1 has two lateral faces, including a bottom 13.
- the vent 3 has an outlet 32 opening to the front face 15 of the enclosure 1.
- the outlet 32 is typically a hole, or a cutout, formed in the front face 15 of the enclosure 1.
- the vent 3 comprises an envelope defined by a first internal partition 33, a second partition 34 which is constituted by the bottom 13, an upper partition 35 and a lower partition 36.
- the upper partition 35 is here formed by a part of the upper face 11, and the lower partition 36 is here formed by a portion of the lower face 12.
- the outlet 32 has a rectangular shape and extends over the entire height of the enclosure 1. It is in itself defined by a front edge of the partitions 33, 34, 35, 36, delimiting the hole in the front face 15.
- the vent has an inlet 31 which is defined by the edge of the partition 33.
- the air then circulates in the vent passing between the partition 33 and the upper faces 11, lower 12 and rear 14 of the enclosure 1.
- the partition 33 has a length L defining the length of the vent 3.
- the vent is then standard, and in this case the partition 33 is a plate, for example wood, rectangular; the edge 31 is parallel to the rear face 14.
- the vent is cylindrical with a circular section.
- the outlet of the vent is then a circular hole formed in the front face of the enclosure and the envelope is generally constituted by a single partition corresponds to the partition 33 described above, internal to the enclosure, including a opposite edge to the outlet constitutes the entrance to the vent.
- the entrance edge of a traditional vent is then included in a plane, and the plane is generally parallel to the front face of the enclosure.
- FIG. 4 represents the ohm impedance curve ( ⁇ ), measured at the terminals of the loudspeaker, for a traditional loudspeaker 1 as a function of the frequency in hertz (Hz).
- the following peaks (at approximately 460, 870, 1300 and 1650 Hz respectively) are very marked, and the amplitude of the radiation of the vent can be comparable to that of the loudspeaker, creating pronounced accidents in the frequency response of the enclosure, which is visible in Figure 5.
- Figure 5 illustrates the radiation of the vent (curve EV), the radiation of the speaker (HP curve), and their sum (curve S), that is to say the radiation of the enclosure . It has the abscissa frequencies in hertz, and the ordinate the pressure level in dBSPL (decibel “Sound Pressure Level", that is to say the sound pressure level).
- the loudspeaker and the vent are out of phase.
- the curve S is below the HP curve and / or the EV curve.
- the loudspeaker and the vent are in phase which has a constructive effect on the radiation.
- FIGS. 6b and 6c This harmful influence on the radiation is visible in FIGS. 6b and 6c, in comparison with FIG. 6a.
- Figure 6a shows the radiation in decibels (dB), according to the orientation with respect to the enclosure, at the limit frequency f c . At this frequency, the radiation is constant whatever the orientation, and is in this case equal to 61 dB.
- the resonance induces a fall in the radiation, in this case 72 to 40 dB, at a position of approximately -8 ° relative to the axis of the enclosure.
- the partition 33 of the vent 3 advantageously has at least one notch at the inlet of the vent.
- partition 33 a partition forming at least in part the casing of the vent 3 and in which extends the notch according to the invention.
- the length L of the vent is then defined as the maximum distance between the inlet 31 and the outlet 32 each formed by at least part of an edge of the partition 33 and along an axis orthogonal to the outlet 32.
- the notch has a depth p representing the largest distance between the inlet 31 and an end 40, along an axis parallel to that of the measurement of the length L.
- the width of the partition 33 defines its dimension orthogonal to its length, and the initial width of the notch its dimension at its root along the width of the partition 33.
- the vent is parallelepipedic.
- the (or) notch (s) are formed in the partition 33 at any time of the embodiment of the enclosure since the partition 33 is not deformed. The goal is then to simplify as best as possible the realization of the enclosure. However, it is preferable to make the notches before the introduction of the partition 33 in the chamber 1, especially when the vent is an insert, for obvious reasons of protection and preservation of the enclosure.
- the inlet defined by the edge 31 has two lateral cutouts defining two notches.
- Each of the indentations has an edge 41a and 41b so that the two notches are symmetrical with respect to a median plane and orthogonal to the partition 33 (not shown).
- a second edge of each of the indentations is here formed, respectively, by the upper face 1 or the lower face 12 of the enclosure 1.
- the indentations thus have a curved edge 41a or 41b and a straight edge defined by a face 11 or 12 of the enclosure 1.
- edge 41a and the upper face 11 thus define the first end notch 40a
- edge 41b and the lower face 12 thus define the second end notch 40b.
- the curvature of the edge 41a makes it possible to define an acute angle with the upper face 11 at the end 40a. It is the same between the edge 41b and the lower face 12.
- the two indentations being identical, they thus have the same depth p.
- the curvature of the edges 41a and 41b is such that the edges 41a and 41b meet.
- the inlet 31 is then integrally defined by the edges 41a and 41b and no longer has a straight portion parallel to the edge of the partition 33 defining a portion of the outlet 32.
- the two indentations therefore have a width equal to half of the width of the partition 33.
- the partition 33 has a central notch having two edges 42a and 42b curved and symmetrical with respect to a plane (not shown) median and orthogonal to the wall 33.
- edges 42a and 42b define between them an acute angle at their end 40.
- their curvature is such that the entry edge 31 is integrally defined by the edges 42a and 42b.
- the width of the notch is then equal to the width of the partition 33.
- FIGS 10 to 13 show vents according to the invention intended to be integrated into an enclosure as described above.
- the vent is parallelepipedal and has an outlet 32 and an inlet 31, as well as an envelope formed of plane partitions 33, 34, 35 and 36.
- the inlet 31 of the vent 3 has at least one notch in the casing of the vent, formed here in the wall 33 internal to the enclosure.
- such a vent is preferably formed by incorporating only the partition 33 into the chamber, the partitions 34, 35 and 36 being advantageously formed, respectively, by a bottom 13, an upper face 11 and a lower face 12 of the enclosure 1 with which they are then merged.
- the indentation is formed by two straight edges 43a and 43b, also symmetrical with respect to a median (and not shown) plane orthogonal to the partition 33.
- the inlet edge 31 is here defined in part by the edges 43a and 43b and a complementary portion 310, which is due to the fact that the notch defined by the edges 43a and 43b has a width less than the width of the partition 33.
- Figure 11 shows a similar vent to that of Figure 9, but having a narrower opening.
- the edge 31 is then defined by the edges 44a and 44b as well as by a complementary portion 311.
- edges 44a and 44b give a convex shape to the notch which can then be defined by a portion of hyperbola, for example, for each of its edges.
- FIG. 12 shows a vent comprising two indentations comparable to that of FIG. 9, but whose widths are both smaller than the width of the vent, relatively shorter than the notch of FIG. 9, or FIG. 11.
- the two indentations each have two curved edges 45a and 45b for the first, 45c and 45d for the second, symmetrical with respect to a plane orthogonal to the wall 33 and passing through the end 40 of the corresponding notch.
- These indentations are furthermore symmetrical with respect to a median and orthogonal (not shown) plane that is orthogonal to the partition 33.
- the inlet 31 is defined by the edges 45a, 45b, 45c, and 45d, as well as by a complementary portion 312 connecting the root of the edge 45b at the root of the edge 45c.
- the root of the edge 45a and that of the edge 45d are located at an intersection with the planar partitions respectively 35 and 36 of the vent.
- the complementary portion 312 could be composed of several segments, not only a segment joining the root of the edge 45b to the root of the edge 45c, but also a segment joining the partition 35 to the root of the edge 45a, and / or a segment joining the root of the edge 45d to the partition 36.
- the complementary part could comprise only a segment joining the partition 35 to the root of the edge 45a, and / or a segment joining the root of the edge 45d to the partition 36
- the root of edge 45b would be joined to the root of edge 45c so that the entry edge 31 is defined only by the edges 45a, 45b, 45c, and 45d.
- Figure 13 shows a tubular vent.
- a vent comprises a casing entirely defined by the partition 33, one edge defines the outlet 32 and another edge defines the inlet 31.
- the inlet 31 is here formed by two edges 46a and 46b defining an indentation, identical (c '). that is to say symmetrical with respect to a median plane of the notch) as well as by a complementary part 313.
- the width of the notch is here less than the perimeter of the entry, the initial width of the notch being determined following the partition 33.
- the initial width of the notch is half the circumference of the tubular vent
- the initial width is the length of the arc of a circle along a fictitious edge of the vent, that is, a portion of the entrance edge that was present before cutting to form the notch, and not a diameter or length of rope that would join the two roots of the notch.
- the complementary part 313 is here defined in a plane parallel to a plane comprising the outlet 32.
- a vent is advantageously made by extrusion, for example in a polymeric material, but may also be formed by folding a sheet, for example a sheet of wood. In the case where the vent is made by folding or deformation of the partition which composes it, it is then advantageous to make the front cut.
- Figure 14 shows the contribution of the indentation on the directivity measurement results.
- the dotted curve represents a standard vent
- the solid line represents a vent with a notch according to the invention.
- a position at 0 ° represents a position in the axis of the enclosure
- a position at 180 ° represents a position behind the enclosure.
- FIG. 15 represents the angular coverage at -6 dB for a traditional enclosure (dashed curve) and an enclosure with a vent according to the invention (solid line curve), as a function of the orientation relative to the enclosure (a position at 0 ° representing the position in the axis of the speaker while a position at 180 ° represents a position behind the speaker).
- FIG. 16 shows an exemplary design of an enclosure 1 according to the invention.
- the chamber 1 shown comprises two identical sub-enclosures (that is to say symmetrical with respect to a median plane of the chamber 1).
- Each sub-enclosure comprises two loudspeakers 2 and a vent 3.
- a vent 3 has a partition 33 with a notch formed by two edges 42a and 42b, that is to say whose width is equal to that of the partition 33 as explained with reference to FIG. 9.
- the vent is here formed, in addition to the partition 33, by a bottom 34 of a sub-enclosure, and a portion of the upper surfaces 11 and lower 12.
- the envelope thus formed defines an internal volume of the vent which here comprises two walls 51 and 52, dividing the internal volume into three sub-volumes. Such walls 51 and 52 make it possible to reinforce the rigidity of the partition 33.
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- Otolaryngology (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015525928A JP6255400B2 (ja) | 2012-08-07 | 2013-08-06 | 凹状ポートを有する、バスレフ型スピーカ |
GB1502157.9A GB2519885B (en) | 2012-08-07 | 2013-08-06 | Bass-reflex speaker having a recessed port |
US14/419,484 US9635454B2 (en) | 2012-08-07 | 2013-08-06 | Bass-reflex speaker cabinet having a recessed port |
CN201380041535.7A CN104521244B (zh) | 2012-08-07 | 2013-08-06 | 带有凹口形风道的低音反射式音箱 |
DE112013003434.4T DE112013003434T5 (de) | 2012-08-07 | 2013-08-06 | Bassreflexbox mit eingebuchtetem Port |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1257662A FR2994519B1 (fr) | 2012-08-07 | 2012-08-07 | Enceinte bass-reflex a event echancre |
FR1257662 | 2012-08-07 |
Publications (1)
Publication Number | Publication Date |
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WO2014023912A1 true WO2014023912A1 (fr) | 2014-02-13 |
Family
ID=47624193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2013/051895 WO2014023912A1 (fr) | 2012-08-07 | 2013-08-06 | Enceinte bass-reflex à évent échancré |
Country Status (7)
Country | Link |
---|---|
US (1) | US9635454B2 (fr) |
JP (1) | JP6255400B2 (fr) |
CN (1) | CN104521244B (fr) |
DE (1) | DE112013003434T5 (fr) |
FR (1) | FR2994519B1 (fr) |
GB (1) | GB2519885B (fr) |
WO (1) | WO2014023912A1 (fr) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
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RU2685038C2 (ru) * | 2014-10-06 | 2019-04-16 | Генелек Ой | Динамик, снабженный волноводом |
US10547942B2 (en) | 2015-12-28 | 2020-01-28 | Samsung Electronics Co., Ltd. | Control of electrodynamic speaker driver using a low-order non-linear model |
CN109891494B (zh) * | 2016-10-21 | 2023-07-11 | 哈曼国际工业有限公司 | 声学部件、声学设备和声学系统 |
JP6852399B2 (ja) | 2016-12-28 | 2021-03-31 | ヤマハ株式会社 | スピーカ装置及びスピーカキャビネット |
US10462565B2 (en) | 2017-01-04 | 2019-10-29 | Samsung Electronics Co., Ltd. | Displacement limiter for loudspeaker mechanical protection |
JP7069699B2 (ja) * | 2017-12-25 | 2022-05-18 | ヤマハ株式会社 | スピーカ構造 |
US10506347B2 (en) | 2018-01-17 | 2019-12-10 | Samsung Electronics Co., Ltd. | Nonlinear control of vented box or passive radiator loudspeaker systems |
US10701485B2 (en) | 2018-03-08 | 2020-06-30 | Samsung Electronics Co., Ltd. | Energy limiter for loudspeaker protection |
US10542361B1 (en) | 2018-08-07 | 2020-01-21 | Samsung Electronics Co., Ltd. | Nonlinear control of loudspeaker systems with current source amplifier |
US11012773B2 (en) | 2018-09-04 | 2021-05-18 | Samsung Electronics Co., Ltd. | Waveguide for smooth off-axis frequency response |
US10797666B2 (en) | 2018-09-06 | 2020-10-06 | Samsung Electronics Co., Ltd. | Port velocity limiter for vented box loudspeakers |
JP2020043444A (ja) * | 2018-09-10 | 2020-03-19 | ヤマハ株式会社 | バスレフポート、およびスピーカキャビネット |
FR3091447B1 (fr) * | 2018-12-27 | 2021-01-22 | Nexo | Armature d’enceinte acoustique comprenant un dispositif de connexion à une autre enceinte acoustique et enceinte acoustique comportant une telle armature |
US11102570B2 (en) | 2019-06-11 | 2021-08-24 | Bose Corporation | Auto-configurable bass loudspeaker |
US11153680B2 (en) | 2020-02-13 | 2021-10-19 | Bose Corporation | Stackable loudspeakers |
US11356773B2 (en) | 2020-10-30 | 2022-06-07 | Samsung Electronics, Co., Ltd. | Nonlinear control of a loudspeaker with a neural network |
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US4126204A (en) * | 1976-02-02 | 1978-11-21 | Trio Kabushiki Kaisha | Speaker system |
FR2534437A1 (fr) * | 1982-10-09 | 1984-04-13 | Int Standard Electric Corp | Enceinte de haut-parleur fermee, utilisant le principe " bass-reflex " |
EP0612194A1 (fr) * | 1993-02-19 | 1994-08-24 | Sony Corporation | Système de haut-parleur |
US6339649B1 (en) * | 1999-04-12 | 2002-01-15 | Waterson Chen | Loudspeaker system with stackable loudspeaker units |
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FR2919454B1 (fr) * | 2007-07-26 | 2009-10-30 | Nexo Sa | Systeme de reproduction sonore a enceinte a events. |
US8351630B2 (en) * | 2008-05-02 | 2013-01-08 | Bose Corporation | Passive directional acoustical radiating |
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-
2012
- 2012-08-07 FR FR1257662A patent/FR2994519B1/fr active Active
-
2013
- 2013-08-06 CN CN201380041535.7A patent/CN104521244B/zh active Active
- 2013-08-06 WO PCT/FR2013/051895 patent/WO2014023912A1/fr active Application Filing
- 2013-08-06 US US14/419,484 patent/US9635454B2/en active Active
- 2013-08-06 GB GB1502157.9A patent/GB2519885B/en active Active
- 2013-08-06 JP JP2015525928A patent/JP6255400B2/ja active Active
- 2013-08-06 DE DE112013003434.4T patent/DE112013003434T5/de active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4126204A (en) * | 1976-02-02 | 1978-11-21 | Trio Kabushiki Kaisha | Speaker system |
FR2534437A1 (fr) * | 1982-10-09 | 1984-04-13 | Int Standard Electric Corp | Enceinte de haut-parleur fermee, utilisant le principe " bass-reflex " |
EP0612194A1 (fr) * | 1993-02-19 | 1994-08-24 | Sony Corporation | Système de haut-parleur |
US6339649B1 (en) * | 1999-04-12 | 2002-01-15 | Waterson Chen | Loudspeaker system with stackable loudspeaker units |
Also Published As
Publication number | Publication date |
---|---|
FR2994519A1 (fr) | 2014-02-14 |
GB2519885B (en) | 2019-10-02 |
JP6255400B2 (ja) | 2017-12-27 |
US9635454B2 (en) | 2017-04-25 |
JP2015528656A (ja) | 2015-09-28 |
GB2519885A (en) | 2015-05-06 |
GB201502157D0 (en) | 2015-03-25 |
CN104521244A (zh) | 2015-04-15 |
CN104521244B (zh) | 2018-08-03 |
DE112013003434T5 (de) | 2015-04-09 |
US20150222984A1 (en) | 2015-08-06 |
FR2994519B1 (fr) | 2015-09-25 |
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