Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JP2002199484 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to line array loudspeakers and portable loudspeakers for performers and speakers or other events using acoustic amplification. [0002] 2. Description of the Related Art Line array loudspeakers are straight loudspeakers with a narrow emission plane and radiating generally in a direction perpendicular to the line. Line speakers are outlined on pages 35 to 36 of Acoustical Engineering (1991 edition) by Harry F. Olsen. [0003] One feature of line array loudspeakers is that in the near field, the decrease in intensity of the sound energy is less rapid than that of a point source. The intensity of the sound energy of the point sound source decreases by about 1 / r2. Where r is the distance from the point source to the listening position. In the near field, the sound energy intensity from the line array loudspeakers is less abrupt and theoretically reduces to 1 / r. Actual line array loudspeaker implementations are often individual acoustic drivers arranged in a row. 04-05-2019 1 [0004] SUMMARY OF THE INVENTION An important object of the present invention is to provide an improved line array loudspeaker. Another important object of the present invention is to provide an improved loudspeaker system for a player. [0005] SUMMARY OF THE INVENTION In one aspect of the present invention, a loudspeaker system comprises a first loudspeaker array. The first array comprises an enclosure having a width and a height and having at least six acoustic drivers, each acoustic driver having a radiating surface and having a diameter less than 3 inches (7.62 cm). The at least six drivers are disposed at substantially regular intervals on the first generally straight line of the enclosure such that the edge separation of the radiating surface is less than 2 inches (5.08 cm). The first array is configured and arranged to emit sound at a predetermined frequency range. [0006] In another aspect of the present invention, a loudspeaker system comprises a portable enclosure and a first portable array module having at least six acoustic drivers disposed substantially rectilinearly in the enclosure. The loudspeaker system also includes a second portable array and a second portable array having a plurality of acoustic drivers arranged substantially linearly, and a second portable array extending the first array substantially linearly. And a mounting system for mounting to the array. [0007] In another aspect of the invention, a loudspeaker array module comprises a portable enclosure having a mounting system for mounting the module to a second module. The loudspeaker array module comprises at least six acoustic drivers. Each driver has a radiating surface and has a diameter of less than 3 inches (7.62 cm), such that at least six drivers have an edge spacing of less than 1 inch (2.54 cm) The enclosures are arranged at regular intervals on a substantially straight line. The loudspeaker array module is constructed and arranged to emit sound essentially over the full range of the audio frequency spectrum. 04-05-2019 2 [0008] According to another aspect of the invention, a method of improving the power converted per unit radiation area of a line array loudspeaker array comprises radiation having edges less than 3 inches (7.62 cm) in diameter, respectively. Attaching the plurality of acoustic drivers comprising the surface on a substantially straight line and placing the acoustic drivers on the lines such that the separation of the edges of the radiating surface of the adjacent acoustic driver is not greater than 1 inch (2.54 cm) And. [0009] A loudspeaker system for live sound source includes a line array loudspeaker comprising a line array of a plurality of acoustic drivers. Each driver has a diameter of less than 3 inches (7.62 cm). The plurality of drivers are arranged in the enclosure in a substantially straight line at regular intervals less than 1 inch (2.54 cm), and the line array is constructed and arranged to be arranged facing the audience near the live sound source . [0010] In yet another aspect of the invention, a loudspeaker system for public facilities having a floor and having a listening area with an intended listening height range above the floor comprises an upper and a lower part and an upper part And a line loudspeaker array comprising a plurality of acoustic driver arrays on a generally straight line joining the lower part, the upper and lower parts defining a plane perpendicular to the line. The array is sized and positioned so that the lower portion is substantially near the floor, such that the intended listening height is between the plane defined by the upper portion and the plane defined by the lower portion. [0011] Other features, objects, and advantages will be apparent from reading the following detailed description with reference to the accompanying drawings. 04-05-2019 3 [0012] DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, and in particular to FIG. 1, the loudspeaker system of the present invention is shown. The line array loudspeaker system 10 comprises a line array loudspeaker module 12. The line array loudspeaker module 12 comprises a large number (smaller than 3 inches in diameter, or a wavelength of about 5 KHz sound) of an acoustic driver 14, preferably an acoustic such as a cone driver having a broad emission surface for the full width of the driver Have a driver. The driver is usually round but may be an oval or "race track" driver smaller than 3 inches in diameter. The acoustic drivers 12 are arranged on a straight line which may be substantially straight even when viewed from the front and the side. The acoustic drivers are closely spaced (i.e. mounted so that the edges of the emitting surface are close to one another and the non-emitting part of the line array loudspeaker module is small). Line array loudspeaker module 12 is surrounded by enclosure 13. The front of the line array loudspeaker module 12 can be covered with an acoustically transparent cover such as a cloth or mesh (not shown in this figure) to protect the acoustic driver 14. [0013] In one embodiment, the line array loudspeaker module 12 is mounted from Bose Corporation of Framingham, Mass., With a center-to-center distance of about 3 inches, such that the gap between the edges of the radiation cone is about 0.75 inches. It includes 12 commercially available 2.5 inch diameter cone acoustic drivers. The enclosure 13 is a closed back structure having a height h of about 36 inches, a width w of 3 inches, and a depth d of 4 inches. The aspect ratio (ratio of height to width) of the module is 12: 1. In a typical line array system comprising multiple line array modules, the aspect ratio is 24: 1 or 36: 1. The line array module 12 weighs approximately 19 pounds (8.62 kg) for easy portability. The line array is flat at the bottom so that it can be placed on the floor or easily attached to a fixed stand (not shown). The line array is constructed and arranged for an operating range of about 7 octaves, for example about 120 Hz to 15 kHz. [0014] The 2.5 inch diameter of each acoustic driver is equivalent to the wavelength of a sound wave 04-05-2019 4 having a frequency of about 5.4 kHz, which is about an octave below the highest frequency designed for the loudspeaker system. Line array loudspeakers using smaller diameter acoustic drivers maintain a smooth vertical distribution at high frequencies and a gradual drop in sound energy intensity. A further advantage of the line array loudspeaker according to the invention is that the line array can convert relatively large amounts of electrical energy. In one embodiment, a line array according to the present invention is capable of converting 7 watts of power per square inch of the emitting surface to acoustic waves. [0015] Referring now to Figures 2a-2c, another embodiment of the present invention is shown. In this embodiment, the enclosure 13 comprises a slot port 16 that connects the back (not shown) of the acoustic driver 14 to the front of the enclosure 13. In FIG. 2 b, the acoustic drivers 14 are individually enclosed, each individually enclosed driver having a port 16. Figure 2c shows a cross-sectional view along the lines 2c-2c of Figures 2a and 2b. [0016] The sound energy intensity of the line array loudspeaker according to the invention drops less rapidly than 1 / r2. Referring now to FIG. 3, there is shown a calculated graph of sound pressure level (SPL) versus distance from the speaker. Curve 30 represents a typical compact loudspeaker and curve 32 represents a line array loudspeaker according to the invention. The two speakers were equalized and adjusted to have the same frequency response and the same SPL (90 dB) 2 meters (6 feet 8 inches) from the speakers, and the SPL was calculated at floor height. The effects of floor reflections are included in both sources. At 60 feet from the speaker, it can be seen that the SPL of the line array loudspeaker according to the invention is only about 10 dB down from the SPL at 6 feet 8 inches. At 60 feet from the speaker, a typical compact loudspeaker is 6 feet 8 inches to 18 dB down. The closely spaced small drivers ensure that the line array loudspeaker according to the invention continues to operate as a line array loudspeaker even at high frequencies (as opposed to point source groups), even at high frequencies. Mostly emit sound waves. Because the individual drivers are smaller, the line array loudspeakers according to the invention have a wider horizontal dispersion than conventional line array loudspeakers, especially at higher frequencies. Also, it can be seen from FIG. 3 that there is an adequate sound pressure level (about 76 dB) at 100 feet while the sound pressure level (about 90 dB) is not objectionable where the player stands. Furthermore, it can be seen from FIG. 3 that the sound pressure level is about 96 dB even when the performer is very close to the speaker, while the sound pressure level exceeds 100 dB when using the conventional compact speaker, Not only 04-05-2019 5 uncomfortable but also harmful. While six feet and eight inches may be a typical distance r1 from the line array loudspeaker system to the performer, 60 to 100 feet is a typical distance r2 from the speakers to the farthest audience sell. [0017] With reference to FIGS. 4-7, the structure of the loudspeaker system for live sound sources, such as a music player, is shown. The line array loudspeaker system 10 can be placed behind the performer 22 and facing the audience in the listening area 11. Because the line source array tends to have minimal vertical dispersion, the sound energy intensity above the top of the speaker is significantly lower than the sound energy intensity below the top of the speaker. To ensure that all parts of the audience get proper sound, the top of the portable line array loudspeaker according to the invention is about the same height as the performer's head or the head of the audience 24 whichever is higher , The height h of the line array loudspeaker system 10 can be changed. For convenience, the range of height including the head of the performer and the head of the audience is referred to as the "intended listening height range". [0018] FIG. 5 shows the situation where the floor is "rake", ie, the floor is not a single horizontal plane, but an inclined plane or a series of stepped planes or steps. In FIG. 5, the height h is sized such that the intended listening height range is between two planes perpendicular to the line array loudspeaker, and one of the two planes (through line 13 Including and perpendicular to the plane of the drawing) is defined by the top of the line array loudspeaker, the other (including the line 15 and perpendicular to the plane of the drawing) is defined by the bottom of the line array loudspeaker . [0019] FIG. 6 shows that the floor is inclined at an inclination angle θ (if the floor is flat, the inclination angle is the angle of the floor to the horizontal, but if the floor is a series of horizontal planes or steps, the inclination angle is Fig. 9 illustrates another configuration with a sloping floor), which is the angle with respect to the horizontal of a line connecting common points such as the front edge of the. In FIG. 6, the line source is inclined such that the two planes are inclined with respect to the horizontal, since the main axis of the line source is perpendicular to the inclination 04-05-2019 6 angle θ. In the configuration of FIG. 6, the line array should be sized such that the height h of the line array is somewhat longer than the intended listening height range. If the line connecting the common points is not a straight line, the angle at which the line array is tilted and the height of the line array are set so that the intended listening height range is between the two planes perpendicular to the line array loudspeaker , One of the two planes (including the through line 13 and perpendicular to the plane of the drawing) is defined by the top of the line array loudspeaker, the other (including the through line 15 and perpendicular to the plane of the drawing) is , Defined by the bottom of the line array loudspeaker. In the configuration of FIG. 6, the height h of the line array need not be as long as the configuration of FIG. FIG. 7 shows an alternative arrangement in which the performer group includes two performers 22a and 22b, each performer having line arrays 10a and 10b, respectively, arranged close (in this case, behind). [0020] The arrangements of FIGS. 4-7 are particularly advantageous. According to the sound system of the present invention, the player hears substantially the same sound as the sound heard by the audience. Furthermore, because it is possible to place the line array loudspeakers behind the performer, it does not interrupt the view of the performer of the audience, which means that the line array loudspeakers are very narrow and more for the audience It is an advantage that is enhanced by having a large height-to-width aspect ratio, which means less noticeable. Also, because the sound field is substantially uniform, there is only a slight possibility of feedback through the microphone 26. [0021] The small size, portability, modularity (discussed below), resistance to feedback through microphones, and low cost due to simple electronics (discussed below) make the line array according to the invention particularly attractive to a performance group. Each member of the group can place a line array in the vicinity of his / her own (usually behind or behind the performer). This arrangement eliminates the need for expensive mixing circuits, the need for people to adjust the mixing circuits, and the need for so-called "backline" loudspeakers. Furthermore, this arrangement makes the arrangement more pleasing to the audience, as the sound from each performer sounds as coming from near the performer rather than from a common loudspeaker system that may be away from one of the performers A stick psychoacoustic effect is provided. 04-05-2019 7 [0022] The small size, portability, modularity, resistance to feedback, and low cost also allow the line array according to the invention to be used especially in public places, eg microphones attached for speakers or pre-recorded It is attractive for use as a portable sound system as a loudspeaker with an audio signal source for playing back messages and music. [0023] The line array according to the invention can also be used in public halls, meeting rooms, places of worship, halls, and similar spaces in a permanently mounted arrangement. The line array according to the present invention can be oriented with the lines vertically and be of appropriate length such that the audience and the player's head is between the horizontal planes defined by the top and bottom of the line array. Such a line array is advantageous because the line array according to the invention can be unobtrusive, easier to integrate into a building, and can be relatively easy to access for installation, maintenance . The relative distance between the line array and the performer, and the line array and the spectator, is very flexible as the decrease in sound energy intensity is gradual and the possibility of feedback through the microphone is low. [0024] Referring now to FIG. 8, the electronic circuitry of the system element is shown. The signal input is coupled to the acoustic driver 14 by a signal amplifier 19. Since the acoustic drivers are connected in parallel to the amplifier 19 and there is no filtering or shading circuit, all acoustic drivers receive essentially the same signal at all frequencies. Although not shown in this figure, there may be equalization circuits, which equalize all acoustic drivers the same so that the signals received by all acoustic drivers are the same at all frequencies. Do. The circuit of FIG. 8 is relatively inexpensive, uncomplicated, and allows the system according to the invention to be implemented with relatively few amplifiers and other components. The present invention provides a line array loudspeaker system 10 by providing an attachable line array loudspeaker module to create a longer line array loudspeaker as described in the description of FIGS. 4 and 5. Make extension easy. Furthermore, since the electroacoustic conversion is divided among many acoustic drivers, the total amount of voice coil structure is divided by the number of acoustic drivers, and the heat generating components are dispersed, so that the total amount of energy 04-05-2019 8 can be increased. It can be sent to the module. [0025] Referring to FIG. 9, a feature of the present invention for extending a line array loudspeaker is shown. Each enclosure 13 of the line array module loudspeaker 12 is provided at the back with a T-shaped channel 30 in which the flange 32 fits. The flange 32 is held in place by a set screw 34 which may be a thumb screw. The channel 30 may be provided with indentations, stops or holes for receiving the push screw 34 for slip prevention. Channels 30 may extend the entire length of enclosure 13 or may be only near the top and bottom of enclosure 13. The flange 30 is then held in place by the second set screw 34, even if it fits into the channel 30 of another enclosure of another line array module loudspeaker, whereby one line array module loudspeaker is Fixedly mounted end to end on another line array module line loudspeaker, a two module long line array loudspeaker can be created. Additional line array module loudspeakers can be similarly attached at the end to create several modules long line array loudspeakers. Simple electrical connections between signal sources and modules and between modules are possible due to the fact that in addition to relatively simple mechanical connections, each module has the simple electrical connection of FIG. 9 without filtering or shading circuitry become. Modularization allows individual modules to be easily transported and to be assembled in the field. This feature makes the line array loudspeaker according to the invention particularly attractive to a sound system for music players. [0026] If desired, separate bass units can be associated with the line array loudspeakers to enhance the bass energy emitted by the line array loudspeakers in applications requiring more bass energy. The separate bass unit may be located at a distance from or near the line array loudspeakers, and if placed in the vicinity, attached to the base of the line array loudspeakers and the line It can help stabilize the array loudspeakers. [0027] It is self-evident that those skilled in the art can now make numerous modifications and developments of the specific devices and techniques disclosed herein. As a result, the present invention is intended to embrace each and every novel feature and novel combination of features 04-05-2019 9 presented or possessed by the devices and techniques disclosed herein, limited only by the spirit and scope of the appended claims. It is interpreted as a thing. 04-05-2019 10
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