ES2277814T3 - MECHANICAL FILTER FOR ACOUSTIC SYSTEMS AND TELEVISION EQUIPPED WITH SUCH FILTER. - Google Patents
MECHANICAL FILTER FOR ACOUSTIC SYSTEMS AND TELEVISION EQUIPPED WITH SUCH FILTER. Download PDFInfo
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- ES2277814T3 ES2277814T3 ES00201058T ES00201058T ES2277814T3 ES 2277814 T3 ES2277814 T3 ES 2277814T3 ES 00201058 T ES00201058 T ES 00201058T ES 00201058 T ES00201058 T ES 00201058T ES 2277814 T3 ES2277814 T3 ES 2277814T3
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- acoustic
- canopy
- filter
- pavilion
- mechanical filter
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- 238000000465 moulding Methods 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920002223 polystyrene Polymers 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 210000003027 ear inner Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000004033 plastic Substances 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
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
- G10K11/04—Acoustic filters ; Acoustic resonators
-
- 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
- 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
- H04R1/2853—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line
- H04R1/2857—Enclosures comprising vibrating or resonating arrangements using an acoustic labyrinth or a transmission line 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
- 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
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding 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
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
Abstract
Filtro mecánico para sistemas acústicos, que incluye al menos un altavoz (6) y un pabellón acústico (5) asociado al altavoz, estando un extremo abierto (7) del pabellón fijado al borde (8) del diafragma (9) del altavoz, mientras que el otro extremo abierto (4) del pabellón define una salida acústica, caracterizado porque el pabellón (5) presenta paredes rígidas, una parte (10, 11) de las cuales se hace flexible en forma de placa flexible (11), de tal forma que la parte del pabellón correspondiente a la placa flexible puede vibrar bajo la presión acústica del interior del pabellón, a fin de excitar, al menos, el primero de sus modos mecánicos naturales para filtrar o absorber los picos de resonancia en la respuesta acústica del pabellón rígido.Mechanical filter for acoustic systems, which includes at least one loudspeaker (6) and an acoustic canopy (5) associated with the loudspeaker, being an open end (7) of the canopy fixed to the edge (8) of the loudspeaker diaphragm (9), while that the other open end (4) of the pavilion defines an acoustic output, characterized in that the pavilion (5) has rigid walls, a part (10, 11) of which is made flexible in the form of a flexible plate (11), of such so that the part of the canopy corresponding to the flexible plate can vibrate under the acoustic pressure inside the canopy, in order to excite, at least, the first of its natural mechanical modes to filter or absorb the resonance peaks in the acoustic response of the rigid canopy.
Description
Filtro mecánico para sistemas acústicos y televisor equipado con dicho filtro.Mechanical filter for acoustic systems and TV equipped with said filter.
La presente invención se refiere a un filtro mecánico para sistemas acústicos. Entre las posibles aplicaciones de este tipo de filtros, puede citarse el ejemplo de los receptores de televisión.The present invention relates to a filter mechanical for acoustic systems. Among the possible applications of this type of filters, we can cite the example of the receivers of TV.
En la actualidad, los consumidores son cada vez
más exigentes en relación con los criterios de selección de
aparatos de televisión. Por una parte, la calidad técnica de las
imágenes y del sonido, y por otra, el aspecto visualmente estético
del receptor de televisión. Para garantizar una adecuada calidad de
sonido, especialmente en la gama de frecuencias medias (entre 300
Hz y 5 kHz) y en la gama de frecuencias baja (entre 20 Hz y 300
Hz), se necesitan unos altavoces cuyo diafragma tenga unas grandes
dimensiones, lo que implica un notable carácter voluminoso. Para
garantizar un aspecto estético funcional, se reducen las dimensiones
del componente que rodea la pantalla del receptor de televisión por
su parte frontal. Dicha exigencia requiere que las columnas de
sonido situadas a ambos lados de la pantalla resulten discretas y
estrechas, especialmente cuando se trata de aparatos de televisión
con formato
16:9.At present, consumers are increasingly demanding in relation to the selection criteria of television sets. On the one hand, the technical quality of images and sound, and on the other, the visually aesthetic aspect of the television receiver. To ensure adequate sound quality, especially in the medium frequency range (between 300 Hz and 5 kHz) and in the low frequency range (between 20 Hz and 300 Hz), speakers whose diaphragm have large dimensions are required, which implies a remarkable bulky character. To ensure a functional aesthetic appearance, the dimensions of the component surrounding the television receiver's screen on the front are reduced. This requirement requires that the sound columns located on both sides of the screen be discreet and narrow, especially when it comes to formatted television sets
16: 9
Como resultado de todo ello, resulta casi obligado situar los altavoces un poco por detrás de la cara delantera, a fin de aprovechar los espacios disponibles entre el tubo electrónico y las paredes laterales del gabinete del aparato de televisión. Teniendo en cuenta que el sonido, para las frecuencias medias y altas, se propaga siguiendo un modo direccional, resulta preferible que el sonido procedente de los altavoces emerja en las columnas de sonido situadas en la cara delantera del aparato de televisión. Para satisfacer estas limitaciones se utilizan guías de sonido, que consisten en unos conductos que unen los altavoces con las columnas de sonido. Los conductos tienen forma de "bocina", con un extremo abierto que está más abocinado que el otro extremo abierto, y que en adelante se denominará "pabellón acústico".As a result of all this, it is almost forced to place the speakers a little behind the face front, in order to take advantage of the available spaces between the electronic tube and side walls of the appliance cabinet of TV. Given that the sound, for the medium and high frequencies, propagates following a mode directional, it is preferable that the sound coming from the speakers emerge in the sound columns located on the face front of the television set. To satisfy these limitations sound guides are used, which consist of about ducts that connect the speakers with the sound columns. The ducts are shaped like a "horn", with an open end that is more flared than the other open end, and that from now on It will be called "acoustic pavilion".
El pabellón acústico está en general fabricado mediante el moldeado de un plástico rígido. El extremo abocinado del pabellón se fija al borde del diafragma de un altavoz, mediante una fijación mecánica, y el otro extremo del pabellón tiene una sección transversal oblonga, estando situado paralelo a una columna de sonido de la cara frontal del aparato de televisión, y sobresaliendo por dicha columna (como por ejemplo se ha descrito en el documento USA 5710396).The acoustic pavilion is generally manufactured by molding a rigid plastic. The flared end of the flag is fixed to the edge of a speaker's diaphragm, by a mechanical fixation, and the other end of the pavilion has a oblong cross section, being parallel to a column of sound from the front face of the television set, and standing out by said column (as for example described in USA 5710396).
Dichos pabellones acústicos resultan indudablemente satisfactorios desde un punto de vista mecánico y estético, pero presentan distorsiones en la reproducción del sonido, y que resultan perceptibles para el espectador.These acoustic pavilions result undoubtedly satisfactory from a mechanical point of view and aesthetic, but have distortions in the reproduction of sound, and that are perceptible to the viewer.
Algunos altavoces realizados de acuerdo con la técnica más avanzada incluyen unos medios que modifican la respuesta acústica. Se facilitan ejemplos de dichos altavoces en la solicitud de patente JP10066182 (que describe un altavoz que incluye un elemento separador que absorbe ciertas perturbaciones de los picos y valles), el documento USA5432860 (que describe un pabellón acústico dotado de aberturas, que incluyen radiadores pasivos, y que modifican la respuesta acústica del pabellón) y el documento USA5479520 (que muestra un sistema de altavoces que incluye una pluralidad de tubos de diferente longitud a través de los cuales se emite el sonido, a fin de conseguir una distribución en frecuencia de los picos de resonancia de la curva SPL (nivel de presión sonora). No obstante, estos altavoces también presentan algunas distorsiones.Some speakers made according to the more advanced technique include means that modify the acoustic response Examples of such speakers are provided in the JP10066182 patent application (which describes a speaker that includes a separator element that absorbs certain disturbances of the peaks and valleys), document USA5432860 (which describes a acoustic pavilion with openings, including radiators passive, and that modify the acoustic response of the pavilion) and the document USA5479520 (showing a speaker system that includes a plurality of tubes of different length through which the sound is emitted in order to get a distribution in frequency of the resonance peaks of the SPL curve (level of sound pressure). However, these speakers also feature Some distortions
El objeto de la presente invención consiste en reducir dichas distorsiones en virtud de una sencilla y eficaz solución.The object of the present invention is to reduce these distortions by virtue of a simple and effective solution.
El objeto de la invención también consiste en un filtro mecánico para sistemas acústicos, que elimina los picos de resonancia sin introducir perturbaciones en la respuesta acústica del sistema en el resto del espectro de frecuencias acústicas.The object of the invention also consists of a mechanical filter for acoustic systems, which eliminates the peaks of resonance without introducing disturbances in the acoustic response of the system in the rest of the spectrum of acoustic frequencies.
El filtro mecánico para sistemas acústicos de acuerdo con la invención, como se indica en la reivindicación 1, satisface las siguientes condiciones: el sistema acústico incluye al menos un altavoz y un pabellón acústico asociado al altavoz, estando fijado uno de los extremos abiertos del pabellón al borde del diafragma del altavoz, y definiendo el otro extremo abierto del pabellón una salida acústica. El pabellón presenta paredes rígidas, a una parte de las cuales se le ha dotado de flexibilidad. La parte flexible del pabellón puede vibrar bajo la presión acústica generada en el interior del pabellón, con el fin de filtrar o absorber los picos de resonancia en la respuesta acústica del pabellón rígido.The mechanical filter for acoustic systems of according to the invention, as indicated in claim 1, satisfies the following conditions: the acoustic system includes the minus a speaker and an acoustic pavilion associated with the speaker, one of the open ends of the flag being fixed to the edge of the loudspeaker diaphragm, and defining the other open end of the Hall an acoustic exit. The pavilion has rigid walls, a part of which has been given flexibility. The part Flexible canopy can vibrate under acoustic pressure generated inside the pavilion, in order to filter or absorb resonance peaks in the acoustic response of rigid canopy.
La invención se comprenderá mejor, siendo más evidentes las ventajas de dicha invención al estudiar la descripción detallada de una realización, tomada exclusivamente como ejemplo no limitativo, y que se ilustra en las figuras adjuntas, en las cuales:The invention will be better understood, being more the advantages of said invention are evident when studying the description detailed one embodiment, taken exclusively as an example no limiting, and illustrated in the attached figures, in the which:
- La figura 1 es una representación diagramático de un aparato de televisión como entorno para la aplicación de la invención,- Figure 1 is a diagrammatic representation of a television set as an environment for the application of invention,
- La figura 2 es un pabellón acústico rígido,- Figure 2 is an acoustic pavilion rigid,
- La figura 3 es un pabellón acústico rígido, una parte de cuyas paredes se hacen flexibles de acuerdo con la invención, y- Figure 3 is a rigid acoustic canopy, a part of whose walls are made flexible according to the invention, and
- La figura 4 es una comparación de las curvas de respuesta acústica de los pabellones mostrados en las figuras 2 y 3 respectivamente.- Figure 4 is a comparison of the curves acoustic response of the pavilions shown in figures 2 and 3 respectively.
La figura 1 muestra un aparato de televisión con un mueble o caja 1 que alberga un tubo electrónico (no representado) cuya pantalla (no representada) sobresale a través de la abertura 2 de la cara frontal o fachada del aparato de televisión. A ambos lados de la abertura 2 se encuentran dos columnas acústicas o de sonido 3 en cada una de las cuales desemboca el extremo abierto oblongo 4 de un pabellón acústico 5. El otro extremo abierto abocinado del pabellón 5 está fijado a un altavoz 6. La función del pabellón 5 consiste en guiar el sonido producido por el altavoz 6 hacia la correspondiente columna sonora 3.Figure 1 shows a television set with a piece of furniture or box 1 that houses an electronic tube (not shown) whose screen (not shown) protrudes through opening 2 of the front face or facade of the television set. To both sides of the opening 2 are two acoustic columns or of sound 3 in each of which ends the open end oblong 4 of an acoustic pavilion 5. The other open end Flare of Hall 5 is fixed to a speaker 6. The function of the Hall 5 consists of guiding the sound produced by speaker 6 towards the corresponding sound column 3.
El pabellón acústico 5, como se muestra en mayor detalle en la figura 2, presenta una parte con una sección transversal oblonga constante 5a y una parte abocinada 5b. El extremo abierto abocinado 7 de la parte abocinada 5b está montado en el borde o corona 8 del diafragma 9 del altavoz 6, mediante unos tornillos o clips mecánicos. El pabellón 5 está fabricado mediante plástico moldeado, por ejemplo, poliestireno, con un espesor de pared del orden de 2,5 a 3 mm. De este modo, la estructura obtenida en el pabellón es rígida.The acoustic pavilion 5, as shown in greater detail in figure 2, presents a part with a section constant oblong transverse 5a and a flared part 5b. He flared open end 7 of flared part 5b is mounted at the edge or crown 8 of the diaphragm 9 of the speaker 6, by means of screws or mechanical clips. Hall 5 is manufactured by molded plastic, for example, polystyrene, with a thickness of wall of the order of 2.5 to 3 mm. In this way, the structure obtained In the pavilion it is rigid.
El inventor ha observado distorsiones en la curva de respuesta acústica de un pabellón rígido 5 de este tipo. De hecho, para una longitud del pabellón de unos 180 mm, la curva de respuesta acústica muestra un pico de resonancia en torno a los 440 Hz (véase figura 4, curva A). Esto significa que en el extremo abierto 4 del pabellón acústico 5, el sonido en torno a la frecuencia de 440 Hz es excesivamente amplificado, en detrimento de las frecuencias adyacentes (150 Hz-300 Hz y 600 Hz-1kHz). Esto crea una distorsión acústica perceptible para el espectador, que también puede ser un espectador de televisión. Este defecto inevitable se debe a la resonancia acústica del "tubo de órgano" formado por el pabellón 5, de acuerdo con el cual el pico de resonancia corresponde a una longitud de onda equivalente a cuatro veces la longitud del tubo (o bien la longitud del tubo equivale a una cuarta parte de la longitud de onda).The inventor has observed distortions in the acoustic response curve of a rigid pavilion 5 of this type. In fact, for a flag length of about 180 mm, the curve of acoustic response shows a peak resonance around 440 Hz (see figure 4, curve A). This means that in the end Open 4 of the acoustic pavilion 5, the sound around the 440 Hz frequency is excessively amplified, to the detriment of adjacent frequencies (150 Hz-300 Hz and 600 Hz-1kHz). This creates an acoustic distortion. perceptible to the viewer, who can also be a viewer of TV. This inevitable defect is due to resonance acoustics of the "organ tube" formed by hall 5, of agreement with which the resonance peak corresponds to a wavelength equivalent to four times the length of the tube (or well the length of the tube is equivalent to a quarter of the wavelength).
Tras numerosas pruebas y un gran número de posibles soluciones previstas, el inventor ha llegado a una solución muy simple y eficaz, que se explicará con la ayuda de las figuras 3 y 4.After numerous tests and a large number of possible planned solutions, the inventor has reached a solution very simple and effective, which will be explained with the help of figures 3 and 4.
La invención utiliza un fenómeno vibratorio mecánico, obtenido mediante la excitación de una placa delgada mediante la presión acústica presente en el pabellón 5 y generada por el altavoz 6, de tal forma que se beneficia de sus primeros modos naturales mecánicos para absorber los picos no deseados de la respuesta acústica del pabellón y mejorar su rendimiento acústico. La invención puede aplicarse a cualquier sistema acústico (sellado o bass-reflex, recintos acústicos, laberintos, otras guías acústicas, etc.), ya que utiliza el exceso de presión generada en el interior de un volumen (cerrado o de otro tipo) por un altavoz.The invention uses a vibratory phenomenon mechanical, obtained by exciting a thin plate through the acoustic pressure present in hall 5 and generated by speaker 6, so that it benefits from its first mechanical natural ways to absorb unwanted peaks of the Acoustic response of the pavilion and improve its acoustic performance. The invention can be applied to any acoustic system (sealed or bass-reflex, acoustic enclosures, labyrinths, others acoustic guides, etc.), since it uses excess pressure generated inside a volume (closed or otherwise) by a speaker
Una realización de la invención (figura 3) que ofrece una solución satisfactoria consiste en practicar una abertura 10 en las paredes rígidas de la parte abocinada 5b del pabellón 5 y cubrir la abertura 10 con una lámina o placa flexible 11, de tal forma que el primer modo natural de vibración mecánica de esta placa 11 (considerada como construida en los límites de la abertura 10) se ajusta a la frecuencia de resonancia a atenuar. De este modo, se lleva a cabo el filtrado deseado, pero sin modificar la respuesta acústica del sistema para el resto del espectro de frecuencias acústicas. Introduciendo variaciones en el material de la placa 11 (rigidez, coeficiente de atenuación, espesor, etc.), en las dimensiones, la forma y la posición de la abertura 10 con respecto al altavoz 6, es posible optimizar el fenómeno vibro-acústico, pero sin generar ruido causado por las vibraciones mecánicas parásitas.An embodiment of the invention (Figure 3) that offers a satisfactory solution is to practice a opening 10 in the rigid walls of the flared part 5b of the Hall 5 and cover the opening 10 with a flexible sheet or plate 11, such that the first natural mode of mechanical vibration of this plate 11 (considered as built in the limits of the opening 10) adjusts to the resonant frequency to be attenuated. From In this way, the desired filtering is carried out, but without modifying the acoustic response of the system for the rest of the spectrum of acoustic frequencies Introducing variations in the material of plate 11 (stiffness, attenuation coefficient, thickness, etc.), in the dimensions, shape and position of the opening 10 with with respect to speaker 6, it is possible to optimize the phenomenon vibro-acoustic, but without generating noise caused by parasitic mechanical vibrations
Para determinar las dimensiones de la abertura 10 y las características de la placa 11, pueden utilizarse las siguientes fórmulas:To determine the dimensions of the opening 10 and the characteristics of the plate 11, the following formulas:
(1)F_{0} = \frac{35,99}{2\pi} \times \sqrt{\frac{D\left(\frac{3}{4} + \frac{2}{a^{2} b^{2}} + \frac{3}{b^{4}}\right)}{8\rho h}}(1) F_ {0} = \ frac {35,99} {2 \ pi} \ times \ sqrt {\ frac {D \ left (\ frac {3} {4} + \ frac {2} {a2} b2} + \ frac {3} {b ^}} \ right)} {8 \ rho h}}
(2)D = \frac{Eh^{3}}{12(1 - \mu^{2})}(2) D = \ frac {Eh3} {12 (1 - µ2)
DondeWhere
F_{0} es la frecuencia del primer modo natural de vibración de la placa,F_ {0} is the frequency of the first natural mode plate vibration,
D es el factor de rigidez de la placa,D is the plate stiffness factor,
E es el módulo de Young correspondiente al material,E is Young's module corresponding to material,
\rho es la densidad del material\ rho is the density of the material
\mu es el coeficiente de Poisson\ mu is the Poisson coefficient
h es el espesor de la placah is the thickness of the plate
a y b son los lados del rectángulo formado por la placa.a and b are the sides of the rectangle formed by the plate.
Partiendo de las fórmulas (1) y (2) que anteceden, es posible calcular la frecuencia del primer modo natural de vibración F_{0} de una placa de poliestireno de 0,5 mm de espesor y con unas dimensiones de 57 mm x 33 mm. El resultado nos da un valor de F_{0} de aproximadamente 457 Hz. La curva B de la figura 4 muestra el resultado en la respuesta acústica del pabellón 5 con una abertura 10 cubierta por una placa flexible 11 de las características precedentes. Se observa que se reduce significativamente el pico de resonancia, lo que se manifiesta a través de una reproducción sonora de mayor calidad, al tener menos distorsión respecto de la curva A.Starting from the formulas (1) and (2) that above, it is possible to calculate the frequency in the first natural way of vibration F 0 of a 0.5 mm polystyrene plate thickness and with dimensions of 57 mm x 33 mm. The result we gives a value of F 0 of approximately 457 Hz. The curve B of the Figure 4 shows the result in the acoustic response of the pavilion 5 with an opening 10 covered by a flexible plate 11 of the preceding features. It is observed that it is reduced significantly the resonance peak, which manifests itself at through a higher quality sound reproduction, having less distortion with respect to curve A.
Una sencilla realización consiste en efectuar la abertura 10 en el pabellón acústico 5 directamente durante el moldeado de dicho componente, y utilizar placas de poliestireno equipadas con adhesivos. La función vibratoria de la placa 11 la garantiza la placa de poliestireno, y el adhesivo sirve para fijar la placa al pabellón 5 y añadir amortiguación a la placa, de tal forma que se reduzcan los efectos no deseados de los armónicos y otros modos de vibración de la placa 11.A simple embodiment consists in carrying out the opening 10 in the acoustic hall 5 directly during the molding of said component, and use polystyrene plates equipped with adhesives. The vibratory function of the plate 11 the guarantees the polystyrene plate, and the adhesive is used to fix the plate to hall 5 and add damping to the plate, such so that the unwanted effects of harmonics are reduced and other modes of plate vibration 11.
De acuerdo con las dimensiones de la abertura 10 y el espesor de la placa 11, y en el caso de los sistemas acústicos fabricados mediante moldeo por inyección (como el pabellón 5), la placa 11 o el diafragma vibrador pueden incluirse directamente en el componente durante el moldeado.According to the dimensions of the opening 10 and the thickness of the plate 11, and in the case of acoustic systems manufactured by injection molding (such as hall 5), the plate 11 or the vibrating diaphragm can be included directly in the component during molding.
Las dimensiones del sistema en cuestión y la importancia de los defectos a eliminar pueden exigir la multiplicidad de este tipo de sistema, es decir, varias aberturas 10 cubiertas por varias placas flexibles 11. Estas placas flexibles pueden tener las mismas dimensiones, para reforzar el filtrado dentro de una estrecha banda de frecuencias, o dimensiones diferentes para ampliar la banda de frecuencias a filtrar.The dimensions of the system in question and the The importance of defects to be eliminated may require multiplicity of this type of system, that is, several openings 10 covered by several flexible plates 11. These flexible plates they can have the same dimensions, to reinforce the filtering within a narrow frequency band, or dimensions different to expand the frequency band to filter.
En términos generales, cuando la placa flexible 11 está fabricada con el mismo material que el pabellón rígido 5, el espesor de la placa se selecciona preferiblemente entre un 10% y un 30% del espesor de las paredes rígidas que rodean la correspondiente abertura 10.Generally speaking, when the flexible plate 11 is made of the same material as rigid canopy 5, the thickness of the plate is preferably selected from 10% and 30% of the thickness of the rigid walls surrounding the corresponding opening 10.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9903964A FR2791802A1 (en) | 1999-03-30 | 1999-03-30 | MECHANICAL FILTER FOR ACOUSTIC SYSTEMS AND TELEVISION EQUIPPED WITH SUCH FILTERS |
| FR9903964 | 1999-03-30 |
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|---|---|
| ES2277814T3 true ES2277814T3 (en) | 2007-08-01 |
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| ES00201058T Expired - Lifetime ES2277814T3 (en) | 1999-03-30 | 2000-03-22 | MECHANICAL FILTER FOR ACOUSTIC SYSTEMS AND TELEVISION EQUIPPED WITH SUCH FILTER. |
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| EP (1) | EP1041538B1 (en) |
| JP (1) | JP2000308175A (en) |
| CN (1) | CN1181673C (en) |
| DE (1) | DE60032407T2 (en) |
| ES (1) | ES2277814T3 (en) |
| FR (1) | FR2791802A1 (en) |
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| FR2819974A1 (en) * | 2001-01-24 | 2002-07-26 | Thomson Licensing Sa | ACOUSTIC SPEAKER AND AUDIOVISUAL APPARATUS COMPRISING SUCH A SPEAKER |
| AU2017203515A1 (en) | 2016-03-08 | 2017-09-28 | Chill Gaming Pty Ltd | Gaming method, system and machine comprising multiple games |
| CN106162458A (en) * | 2016-07-19 | 2016-11-23 | 南京大学 | A kind of speaker sound conduction cavity device |
| AU2018214028A1 (en) * | 2017-04-19 | 2018-11-08 | Chill Gaming Pty Ltd | Audio system |
| US10536772B2 (en) | 2017-04-19 | 2020-01-14 | Chill Gaming Pty Ltd | Audio system |
| CN109246539A (en) * | 2018-10-17 | 2019-01-18 | 无锡杰夫电声股份有限公司 | A kind of thin speaker case loading elastic sheet |
| US11310587B2 (en) * | 2019-10-08 | 2022-04-19 | Bose Corporation | Horn loudspeakers |
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|---|---|---|---|---|
| US5432860A (en) * | 1990-02-09 | 1995-07-11 | Mitsubishi Denki Kabushiki Kaisha | Speaker system |
| EP0589515B1 (en) * | 1992-09-23 | 1999-01-27 | Koninklijke Philips Electronics N.V. | Loudspeaker system comprising a plurality of tubes |
| KR960011026B1 (en) * | 1993-07-26 | 1996-08-16 | 대우전자 주식회사 | Speaker system of t.v. |
| JP3449571B2 (en) * | 1994-08-30 | 2003-09-22 | 株式会社東芝 | TV set speaker system |
| JP4043539B2 (en) * | 1996-08-21 | 2008-02-06 | 松下電器産業株式会社 | Manufacturing method of speaker device |
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1999
- 1999-03-30 FR FR9903964A patent/FR2791802A1/en active Pending
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- 2000-03-29 JP JP2000092101A patent/JP2000308175A/en active Pending
- 2000-03-30 CN CNB001048570A patent/CN1181673C/en not_active Expired - Fee Related
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| EP1041538A1 (en) | 2000-10-04 |
| CN1181673C (en) | 2004-12-22 |
| FR2791802A1 (en) | 2000-10-06 |
| DE60032407D1 (en) | 2007-02-01 |
| CN1270473A (en) | 2000-10-18 |
| DE60032407T2 (en) | 2007-10-11 |
| EP1041538B1 (en) | 2006-12-20 |
| JP2000308175A (en) | 2000-11-02 |
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