Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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 
  • H04R1/227—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
  • H04R1/2861—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn
  • H04R1/2865—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn for loudspeaker transducers

Definitions

• the present invention finds application in the field of sound engineering, in loudspeaker systems for dubbing, and in particular in low- and ultra-low-frequency loudspeaker systems for generating high sound pressures in large halls or in open spaces, if necessary in low distortion and directional emission of sound waves .
• the main objective of the present invention is the creation of an effective small-sized low-frequency curved horn loudspeaker for operation in the trihedral corner of rectangular rooms, which makes it possible to group two horns - on the wall and on the floor, four horns - on the floor, on the wall and on the ceiling, working in half-space , as well as groups of eight horns - suspended and working in a full spherical space.
• a loudspeaker according to the present invention comprises:
• Each of the input channels is bounded between two parallel planes and three distance elements, and then passes into the corresponding intermediate channel, after which there are two refractions, one after the other, until reaching corresponding output channel;
• the output channel is one third of the isosymmetric part of the space created by the walls of the room and the loudspeaker, for the formation of an individual propagation path of the sound wave through the input, intermediate and output channels.
• Each of these three paths has essentially the same input area, degree of expansion, and isometric symmetry with respect to the common horn and trihedral angular axis;
• the loudspeaker consists of a two-membrane head mounted in the mounting holes for the head, and two voice coils have inverse phases to provide flexibility in volume at the mouth of the mouth of the speaker.
• the two-diaphragm head has a common chassis and a single magnetic system, and contains:
• a single magnetic system with one permanent magnet having two serially connected air gaps for voice coils.
• a common chassis that supports a common magnetic system, as well as the periphery of both mobile systems.
• the two-membrane head further comprises two opposing magnets and movable systems with voice coils for electromechanical feedback, where voice coils for electromechanical feedback are rigidly attached to the bases of the voice coils, while the magnetic systems are fixed on both sides in the inner the space of the main magnetic system of the two-membrane head.
• the loudspeaker comprises a pair of low-frequency diffuser heads mounted against each other with respect to their diffuser on each of the mounting holes of the head.
• the loudspeaker comprises a pair of consecutively mounted low-frequency diffuser heads, where one of the diffusers is directed to the magnetic system of the other head, and each of the heads is mounted on one of the mounting holes for the heads, and where the phase of one of the heads is wrapped to produce a common-mode sound waves on a pair of heads in a common throat of a speaker.
• the loudspeaker comprises a two-diaphragm head, which is also the subject of the present invention, mounted in mounting holes for the heads in which the electromechanical negative feedback sensors are located.
• the invention is a system comprising two loudspeakers placed adjacent to each other in the immediate vicinity, between a wall and a floor, between which a rigid dividing wall is mounted, commensurate with their size.
• the invention is a system comprising four speakers, equivalent to two systems consisting of two speakers mounted side by side in close proximity, to floor, wall or ceiling, and between the two systems is a rigid dividing wall, commensurate with their size.
• the invention is a system comprising eight loudspeakers, equivalent to two systems consisting of four loudspeakers mechanically fixed in a sufficient number of points and located in the central scoring area of large arenas, and between the two systems there is a rigid dividing wall commensurate with their size.
• Figure 1 illustrates the prior art, showing the small-sized angular horn according to US patent 2,373,692.
• Figure 2 illustrates the prior art, showing a curved corner horn according to US patent 7,233,677 B2.
• Figure 3 illustrates an exploded view of a curved corner horn.
• Figure 4A shows in perspective diagram a perspective section of a horn with two separate heads.
• Figure 4B shows, in a diagram, a perspective section of a horn with one double head.
• Figure 5 illustrates a perspective partial section of a double head equipped with two electromagnetic sensors for applying electromechanical negative feedback on speed and acceleration.
• Figure 6 shows a detailed perspective partial section of a double head from Figure 5.
• Figure 7A shows a perspective view of two grouped horns on a wall and on a floor, using a rigid dividing wall between them.
• Figure 7B shows a perspective view of four grouped horns on the floor, using hard dividing partitions between them.
• Figure 7B shows a perspective view of eight grouped horns for hanging on large arenas using rigid dividing walls between them.
• the basis of an exemplary embodiment is a rectangular coordinate system X, Y and Z, set by the edges of the trihedral corner of the room, in which X, Y cover the floor plane.
• the axis hereinafter referred to as the axis of isometric symmetry, passes through the top of the trihedral angle and lies at the same distance from the floor and the other two walls of the trihedral angle.
• An approximate variant is completely symmetric with respect to the introduced axis of isometric symmetry.
• Figures 3 and 4A show a perspective exploded view and a perspective partial section of an exemplary embodiment, respectively.
• the rear horn element (10), consisting of an angle plane adapted to the trihedral angle (27), a reflective pyramid attached to it (25), and wall spacers (24) are located in the trihedral corner of the room and are attached to the walls (22) and the floor ( twenty).
• Two heads (12) are attached to the corresponding mounting planes (14) and (16), and their axes are located along the axis of isometric symmetry, thus limiting, together with the struts (19), a set of three input channels (26). Placed approximately 120 degrees apart, said inlet channels extend from a cylindrical peripheral zone common to the two heads and expand radially in substantially the same degree of expansion to the corresponding axes X, Y and Z, and will bring them closer at an angle. 35 degrees in relation to them. Input channels (26) are refracted twice while maintaining their degree of expansion; the first refraction is at the input of the corresponding set of intermediate channels (28), each of which consists of the space between two adjacent side walls (18) and the element contacting them to close the volume (13).
• the second refraction is at the rear horn element (10) and the reflective pyramid (25), where the intermediate channels (28) are converted into a set of output channels (30), each of which covers the space between two adjacent wall braces (24), a dihedral angle between them with adjacent halves of the wall, and half of two adjacent side walls of the body of the exemplary embodiment (18).
• the diffusers of the heads are loaded simultaneously with three separate horn configurations, each of which contains the corresponding input, intermediate and output channels sequentially passing from one to the other, and the parallel load of the said diffusers with their throats is equivalent to the throat load of the common horn with the total longitudinal section at each point over the axis of the opening obtained by adding the corresponding longitudinal sections of the three horn configurations at the corresponding point throughout their PU and through the inlet, intermediate and outlet channel portion extension.
• the hyperbolic-exponential law of expansion of the common horn It is effectively approximated by three different, simple for the practical implementation of linear degrees of expansion installed in each serial channel horn configurations.
• Each of the two heads has its own closed volume for optimal operation, and the head volume, which is closer to the rear horn element (10), is limited by the mounting plane (14), the side walls of the body (18) and the volume-covering elements (13), while while the opposing head volume is formed by a set of three triangular rigid planes (15) and a set of volume-closing elements similar to the above (13).
• Figure 4B shows an example version in which elements are identical to those of the previous horn, but instead of two separate heads (12), a two-membrane head with a single chassis (31) is used, optimized for working with radially expanding horn systems.
• Figures 5 and 6 show in detail a two-diaphragm head with a common chassis (31), the common magnetic system of which contains a permanent magnet (32), pole pieces (33) on both sides and a T-shaped magnetic circuit (34), while the latter create two consecutive air gap where voice coils (35) are centered on each head diffuser.
• a common chassis 31
• the common magnetic system of which contains a permanent magnet (32), pole pieces (33) on both sides and a T-shaped magnetic circuit (34), while the latter create two consecutive air gap where voice coils (35) are centered on each head diffuser.
• electromagnetic sets of sensors are mounted on each moving system, and the sensor coil (42) is mounted on the diffuser of the corresponding head through at least two clamps (41).
• the magnetic system of the said sensor kit consists of a permanent magnet (37), internal pole pieces (38) and an external pole piece (39), and all three form a slot with a long linear magnetic field on which the EMOS sensor coil is centered.
• Each of the magnetic feedback systems (36) is located on one side of the main magnetic system heads, by means of a clamping element (40).
• the feedback coil signal is proportional to the speed of the mobile system, and by differentiating this signal, a second signal is obtained proportional to the acceleration of the diffuser.
• Both signals are used to apply negative feedback on acceleration and speed, at which negative feedback on acceleration reduces the resonant frequency of closed heads, but at the same time increases the quality factor.
• negative feedback on the speed with the required depth is used.
• the present invention is an effective low-frequency curved small-sized horn loudspeaker designed to operate in the trihedral corner of rectangular rooms, thereby making it possible to group two horns on the wall and floor, four horns on the floor, wall or ceiling for working in half-space, as well as for grouping eight horns - suspended and for working in a full spherical space.
• a pair of head diffusers operating in the common throat of a horn was used, while a faster opening of the horn was provided while maintaining the same outlet for a given critical frequency of the horn, respectively, a shorter horn.
• the symmetrical load from the horn on the head diffusers and their suspension devices is obtained, by means of a new arrangement in which the diffusers are parallel to each other and are compressed in a common symmetrical loading and radially expanding horn neck, which ensures high stability of the moving head system in the conditions of extreme mixing.
• the invention is characterized by isometric physical symmetry with respect to the trihedral angle, which provides the same symmetry of the spatial sound field. This is obtained by dividing the speaker into three separate, identical, twice-refracted sound channels with isometric symmetry, which work in parallel and determine the symmetric load of the head diffusers in the angular space in front of the horn system.
• the invention also provides a special double head with a common chassis and a common effective magnetic system with one permanent magnet suitable for operation in a horn, which significantly reduces the vibration and mass of the system, and also significantly reduces the volume of the pre-chamber chamber, which increases the upper limit frequency of use of the horn system installed on this volume, while the symmetry is further improved.
• the created double head is additionally equipped with electromagnetic sensors for introducing electromechanical feedback on speed and acceleration.
• the invention is suitable for scaling, for operation at various critical frequencies of the horn, as well as when using heads with arbitrary sizes.
• the horn was designed with a hyperbolic-exponential increase in the input area, with a critical horn frequency of 30 Hz, using an expansion parameter T of 0.55.
• T-shaped outer pole piece forming two consecutive air gaps

Landscapes

• Health & Medical Sciences (AREA)
• Otolaryngology (AREA)
• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
• Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
• Piezo-Electric Transducers For Audible Bands (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=49712739

Family Applications (1)

Country Status (2)

Cited By (2)

Family Cites Families (8)

• 2012
  • 2012-06-06 BG BG111230A patent/BG66621B1/bg unknown
• 2013
  • 2013-06-06 WO PCT/BG2013/000026 patent/WO2013181723A2/fr not_active Ceased

Also Published As

Similar Documents

Legal Events