Acoustic system

IPC classes for russian patent Acoustic system (RU 2331990):

H04R1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means

Another patents in same IPC classes:

Acoustic system / 2321186
Claimed acoustic system contains a case with high frequency and low frequency loudspeakers mounted on its face panel, which panel is inclined towards the back panel of the case and displaced towards the inside relatively to the plane of its frontal vertical window. along its perimeter the face panel is rigidly connected to case walls. The high frequency loudspeaker is provided with a horn, formed by a part of inclined face panel, two sides and top shield. The last three parts are rigidly connected to the face panel, to each other and to adjacent sections of perimeter of plane of frontal vertical window of the case. The sides may be made flat, ensuring linear characteristic of horn expansion, or curvilinear, ensuring exponential characteristic of horn expansion. The angle of inclination of face panel α is selected within range between 7° and 35°. As a result, sound quality is improved and vibration of face panel is reduced.

Vortex damper of acoustic system / 2312469
Acoustic system contains a loudspeaker, positioned in a volumetric body made of sound-absorbing material, frontal part of which serves as emitter of primary acoustic signal. Additionally the acoustic system contains at least one conic vortex damper in back part of the loudspeaker in form of rigid radially sector-like blades twisted along their length, smoothly changing the incidence angle to the flow of passing acoustic signal.

Device for high quality reproduction of sound / 2292128
Device for high quality sound reproduction includes a source of sound and unit for adjusting sound pressure, positioned inside a body with sound-reflective surface. Unit for adjusting sound pressure in the body is made in form of sound-absorbing element, including system liquid - saturated steam with boundary, formed on developed surface of heat accumulator, while aforementioned liquid - saturated steam system is pressurized. Device also contains chamber isolated from environment, provided with heat exchanger and connected to sound absorption chamber with possible movement of gases from sound absorption chamber into additional chamber and return of condensed gases into sound absorption chamber. Device may additionally be provided with evaporator, positioned in the sound absorption chamber in the area where it is connected to additional chamber.

Loudspeaker with controllable resonances / 2282316
Loudspeaker with controllable resonances, in which to opposite walls of body, or to magnet of loudspeaker speaker, a brick of resonance wood is tightly connected with a selected set of resonances, by means of which redistribution of energy occurs from native oscillations of body walls and of speaker to consonance.

Acoustical device / 2250573
Proposed acoustical system has basket with moving-coil loudspeaker and acoustical baffle disposed behind the latter. Acoustical baffle is made in the form of truncated cone enclosing entire surface of loudspeaker and has transverse slot on side surface. Acoustical baffle base is secured on front wall of basket over loudspeaker perimeter and its top is joined with loudspeaker magnetic system; acoustical baffle surface is made of sound-absorbing material. Transverse slot is made on acoustical baffle perimeter so that it divides the latter into two members. Top member joined with loudspeaker magnetic system has concave edge. Transverse slot may be disposed in bottom part of acoustical baffle with its edges overlapping and gradually bent out apart, bottom edge being bent out from loudspeaker.

Acoustic system / 2331990
Acoustic system includes a case with a dynamic at its front panel and a vibration damping element placed inside. The vibration damping element is a triangular prism capable of redistribution of sound wave energy to the case corners where the rear and side panels are joined. One of the side facets of the prism is rigidly fixed to the rear panel of the case.

Acoustic system / 2353072
Invention relates to electrical acoustics and may be used where high quality of sound reproduction is required, e.g. halls and studio insonification. Acoustic system consists of a housing, dynamic head of loudspeaker, fixing elements and phase-inverting hole. In section, the wooden housing is oval-shaped and stretched along vertical symmetry axis of the item. One round opening is made at the opposite sides with their centres being on horizontal symmetry axis. One of the openings is closed tightly by resonating wooden end wall. The dynamic head diaphragm in loudspeaker is in the second hole of the housing. The perimeter of the above housing forms phase-inverting hole together with the above hole edges. The width of phase-inverting hole allows for creating maximum value of coherent wave, whereas the resonating end wall is in the form of segment, which is bent so that to ensure precise angle for maximum sound wave reflection. The end wall thickness is less than the housing thickness ensuring end wall vibration.

Technology of built-in acoustic transmission line with closed loop / 2377740
Housing is proposed, which evens out acoustic impedance, which contains a loud speaker fitted in the buffer cavity of the mouth of the transmission line with a closed loop. The transmission line consists of a terminal element, inner and outer walls of the housing, high density lining and a mouth area. The transmission line eliminates internal chaotic standing waves, at the same time providing for standing waves at variable frequency, which, due to superposition of waves, compensate for output loss at high frequencies due to mass acceleration, at the same time damping resonance of the loud speaker. Also the housing, which evens out acoustic impedance, is used for creating pressure which loads the loud speaker directly into the transmission line with a closed loop and an acoustic low-pass zonal filter is used to convert output only into the low-frequency component through a port.

Loud speaker / 2381631
Invention relates to electroacoustics, particularly to compact high-quality loud speakers for sound-reproducing equipment. The loud speaker has a housing, an electrodynamic head rigidly attached to the housing, and a passive radiator. Between the electrodynamic head and the passive radiator there is an acoustic channel whose cross sectional area is (0.1-0.5)S_dif, area of the passive radiator is (1-20)S_dif, length of the channel is selected from the condition (0-0.4)D and distance between the electrodynamic head and the passive radiator is equal to (0.01-0.5)D, where S_dif is area of the diffuser of the electrodynamic head; D is diametre of the passive radiator. The acoustic channel is made in form of a pipe placed coaxially with the electrodynamic head. For accurate tuning, the acoustic channel can be made telescopic.

Acoustic transformable system / 2433566
Acoustic transformable system includes a set of tubular sections of temporary structures mated by end faces, fixed by fastening elements, wherein the set of tubular sections includes a frontal, closing, redirected and intermediate sections; on the outer and inner surface of the redirected sections there are reinforcement ribs with trapezoidal grooves whose inner surface is fitted with resilient seals; the redirected, frontal and closing sections are an axially transformable, telescopic structure in which the number of intermediate sections per unit is less than the number of redirected sections; the fastening elements tie the frontal and closing sections and are fitted with locking devices and the closing section has phase-inverting channels.

FIELD: physics.

SUBSTANCE: acoustic system includes a case with a dynamic at its front panel and a vibration damping element placed inside. The vibration damping element is a triangular prism capable of redistribution of sound wave energy to the case corners where the rear and side panels are joined. One of the side facets of the prism is rigidly fixed to the rear panel of the case.

EFFECT: reduced vibration of the rear panel of the case; reduced resonance effect and streamlined manufacturing technology.

3 cl, 2 dwg

The invention relates to the field of electro-acoustics and can be used in consumer and professional audio equipment.

During operation of the acoustic system, the internal surface of the housing reflects the chaotic sound waves generated by the back speakers and falling mainly perpendicular to the rear wall of the housing. The result is a vibration, giving overtones, is the degradation of dynamic performance speaker systems, poor sound quality. Developers acoustic systems introduced in the design of the damping elements, which allows to reduce the vibration to the chassis to improve sound quality. An additional factor affecting the quality of the speaker sound is the presence of the resonances of the body corresponding to the distances between the parallel walls of the housing. So, if the speaker is made in the form of a rectangular parallelepiped, it has three main resonance between the top and the bottom, between the side walls between the front panel and the rear wall. Developers strive to reduce or remove these resonances to improve the quality of the sound.

Known acoustic system, comprising a housing with located on its front panel speaker and placed between the back of the side and rear of the Cabinet, perforated panel to the acoustic resistance, perform the function campfireusa element (see RF patent №25132 for utility model "Device for acoustic design dynamic heads", MPK-7: H04R 1/28, Appl. 24.04.2002,). Perforated panel operates as a resonant absorber and is intended only for a certain frequency of sound waves, which depends on the thickness of the panel itself, and the diameter is made in her holes, and the distance between the centers of the holes. However, the rest of the spectrum of the radiated sound waves not campfires and effective suppression of vibration does not occur. For resonance between the front panel and the back wall, you must configure the perforated panel at this resonance, but even this requirement does not reduce the vibrations at frequencies above and below resonance. In addition, vibration, side, and top and bottom walls is not reduced, including at frequencies corresponding to the resonances, due to their parallelism. The lack of similar is that to achieve a significant improvement in the sound quality fails.

Known acoustic system, comprising a housing installed on the front panel speaker and placed inside fibrogenesis element made in the form of a palisade of the many pyramids of random sizes (see Vpedanov. Household and geotechnica, Smolensk: Rusich, 1997, s). In this acoustic system proposed complex design of the damping element, which is essential for a high quality sound. The effectiveness of the known acoustic system is achieved by scattering of sound waves in the palisade pyramids, i.e. the transfer of energy to neighboring pyramids. However, the known acoustic system suffers from the disadvantage of difficulty of manufacture of the device.

The known device described in the book "home audio" on s is closest to the claimed device to the technical essence and the achieved effect, therefore, selected as a prototype.

The present invention is the simplification of manufacturing technology speaker system while providing high quality sound.

The technical result is available only vibrationfree element providing damping of resonances through the transfer of a significant part of energy to the rigid structural elements in the corners of the body.

This task is achieved by the fact that in the known acoustic system, comprising a housing installed on the front panel speaker and placed inside fibrogenesis element according to the invention vibrationfree element is designed in the form of treugol the second prism with the ability to redistribute the energy of the sound waves in the corners of the body, representing the junction of the side and rear walls of the casing, with one of the side faces of the prism are rigidly connected to the rear wall of the housing.

In the acoustic system, the base of the prism can be made inclined relative to the rear panel.

In the acoustic system, the base of the prism can be made perpendicular relative to the rear panel.

Studies on patent and scientific and technical information sources show that the proposed speaker system is unknown and should not be explicitly studied the prior art, and therefore, meets the criteria of "novelty" and "inventive step".

The claimed invention may be made in the conditions of enterprises in the industry, engaged in the production of acoustic systems using a standard domestic or imported equipment, known technologies and mass-produced by industry relevant parts and assemblies.

It can be widely used in home, offices and entertainment areas.

Thus, the claimed speaker system meets the criterion of "industrial applicability".

We offer a set of essential features according to the claimed device new properties that allow you to solve the problem.

Thanks to the installation of the prism on the back wall inside the housing portion of the sound waves from the back of the speaker falls perpendicularly on the edge of the prism and splits into two parts, aimed down her sides and bases, where falls in the corners, where the stiffness of the elements gives less vibration. The other part of the sound waves falling on the faces of the prism at an angle of inclination: one piece unfolds, the other part is reflected on the side walls of the housing, and the third passes through the material on the perimeter of the base of the prism, i.e. the angles of the speakers, where it is extinguished. Through the prism of the internal volume of the shell has a complex configuration, and the resonance occurs only between the top and bottom, and between the side walls of the casing only in that part which does not overlap with the prism. The result is radiated less parasitic vibrations and, consequently, achieve a high sound quality. This simplified manufacturing technology speaker system, because there is only one vibrationfree element.

Proposed speaker system is illustrated by drawings, where:

Figure 1 is a vertical section;

Figure 2 - section a-a of figure 1.

Speaker system includes a housing 1, in which the front panel 2 has a loudspeaker 3. The housing 1 is made, as a rule is, made of wood, sometimes of plastic. Its design can be anything, but the figures of the drawings to the description given case in the form of a rectangular parallelepiped. On the rear wall 4 of the housing 1 is rigidly fixed to one of their side faces of the triangular prism 5, is made of wood or plywood sheets. The base of the prism 5 may be inclined or perpendicular relative to the rear wall 4 of the housing 1. Mount prism 5 to the housing 1 can be made using glue and screws. The rib 6 is directed along the height of the housing 1. Between the rib 6 and the rear side of the loudspeaker 3 there is an air gap.

The acoustic system works as follows.

Upon receipt of an electrical signal to the loudspeaker 3 is the radiation of sound waves in the surrounding space, and the inside of the case 1. Entering from the back side of the loudspeaker 3, the edge 6 of the prism 5, and on its lateral sides and sloping grounds, the sound wave energy is redistributed through the prism in the corners, representing the junction of the side and rear walls of the casing, where it is extinguished and does not create noise and other interference that other speakers have a negative effect on sound quality. The inventive system provides superior sound quality.

The advantages of the proposed acoustic system which we compared with prototype:

- improved sound quality;

- simplification of manufacturing technology;

- reduction of production cost.

1. Speaker system, comprising a housing installed on the front panel speaker and placed fibrogenesis element, characterized in that vibrationfree element is designed in the form of a triangular prism with the ability to redistribute the energy of the sound waves in the corners, representing the junction of the side and rear walls of the casing, with one of the side faces of the prism are rigidly connected to the rear wall of the housing.

2. The acoustic system according to claim 1, characterized in that the base of the prism is made inclined relative to the rear wall of the Cabinet.

3. The acoustic system according to claim 1, characterized in that the base of the prism is made perpendicular to the rear wall of the housing.