KR101754521B1 - A dodecahedron loudspeaker system using a coaxial two way unit - Google Patents

Abstract

This invention is directed to a loudspeaker system. The configuration of the loudspeaker system 1000 of the present invention includes a coaxial two-way unit 50; A loudspeaker 100 based on the upper coaxial two way unit 50, having a dodecahedron enclosure structure and disposed in the middle of each side of the dodecahedron; An acoustic lens 120 used in a high-frequency driver of each of the above loudspeakers 100 for eliminating a high-frequency dip phenomenon; And a unit 140 for reinforcing the bass and treble of the upper loudspeaker 100. The sound level distribution provides uniform sound pressure distribution throughout the space and each corner angle of the dodecahedron is 57 degrees, The angle between the two surfaces is 72 °.

Description

[0001] The present invention relates to a 12-sided loudspeaker system using a coaxial two-way unit,

This invention relates to a 12-sided loudspeaker system using a coaxial two-way unit. In particular, the invention relates to a 12-sided loudspeaker system that uses an acoustic lens in a high-frequency driver to extend the high frequency range of reproduction up to the 16 kHz band and provide a uniform beam width.

One of the important challenges to be solved in the technology of the speaker field is the problem of the spatial location of the speaker. In other words, the position of the speakers in most music spaces was not correct, which made it impossible to listen to the music sound with equal sound pressure. Therefore, it was necessary to use a speaker unit having a sound pressure equal to the entire space, capable of reproducing sound with high clarity, and having good characteristics of low sound, medium sound and high sound. Therefore, we tried to solve this problem by adopting a conventional 12-sided speaker, but it was only able to function as a space acoustic measurement analyzer. The reason for this is that a general loudspeaker is difficult to use for music because of its frequency (see FIG. 1), low reproduction ability of bass and high frequency band, low coverage due to short wavelength in high frequency band, (SPL) can not be secured, so that it is difficult to perform reliable measurement in a large space due to a low S / N ratio. These problems have led to the need for techniques that can solve these problems in the measurement and music reproduction fields.

One of the prior art related to this invention is the "Phosphate plug and Acoustic lens for direct radial loudspeaker" of registered trademark Haman International Inc. of the United States of America registered patent number 1192910 (registered October 12, 2012). However, this document does not teach the technology corresponding to this invention. And more particularly to a technique for simply improving directional audio performance.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a technology for a 12-body loudspeaker system using a coaxial two-way unit that can overcome the disadvantages of the prior art described above.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

A preferred embodiment of the loudspeaker system, which is a means for solving the technical problem of the present invention,

A coaxial two-way unit;

A loudspeaker based on a coaxial two way unit, having a dodecahedral enclosure structure, centered on each side of the dodecahedron;

An acoustic lens used in the high-frequency driver of each of the above loudspeakers to eliminate the high-frequency dip phenomenon; And

A unit to reinforce the bass and treble of the upper loudspeaker;

And,

Leading to a uniform sound pressure distribution throughout the space,

Each corner angle of each of the dodecahedron is 57 °, and an angle between two neighboring faces is 72 °.

In this embodiment, when used for music reproduction, the sound of the loudspeakers diffusing sound by the upper loudspeakers in four directions is incident on the ceiling surface, and then the sound reflected from the floor is blocked, It is preferable to further include a diffusion plate installed on the ceiling for BGM (background music) in order to prevent the interference phenomenon from occurring in the listening area.

Also, in this embodiment, in order to improve the frequency characteristics of the low and high frequency bands, the frequency response characteristic is set to +/- 3 dB deviation in the band of 100 Hz to 20 KHz, and the sound pressure level (SPL) in the reproduction band is 95 dB To 100dB, and it is desirable that the high frequency characteristic is improved when applied to a product for music reproduction and architectural sound measurement.

In this embodiment, the upper acoustic lens is a spherical acoustic lens having a diameter of 25 mm, and the coverage angle at this time preferably has a positive directivity characteristic of 120 deg. Throughout the frequency range.

With the implementation of the present invention, it is possible to accurately and easily set the position of the speaker in most music spaces, thereby making it possible to listen to the music sound with uniform sound pressure, and a clear sound is obtained.

Further, in the present invention, by using an acoustic lens for the high-frequency driver, the high-frequency reproduction range extends to the 16 kHz band and a uniform beam width is obtained.

Therefore, by implementing the present invention, equal sound pressure can be ensured in all the spaces, sound reproduction with high clarity can be performed, and characteristics of bass, midtones and treble sound are better because frequency characteristics are better than those of conventional dodecahedron speakers.

1 is a characteristic curve showing frequency response and distortion of a loudspeaker according to the prior art,
FIG. 2 is an embodiment of a design diagram of a trilobal body enclosure of a twelve-octave loudspeaker using a coaxial two-way unit according to the present invention,
FIG. 3 is a frequency characteristic curve of the loudspeaker of FIG. 2,
Fig. 4 is an exemplary wiring diagram of the loudspeaker system of Fig. 2,
FIG. 5 is a view illustrating an example of a ceiling diffusion processing method of sound by the loudspeaker of FIG. 2,
FIG. 6 is a graph showing a result of measurement analysis (frequency response data) by the loudspeaker of FIG. 2,
FIG. 7 is a diagram showing a measurement analysis result (polar coordinate frequency response) by the loudspeaker of FIG. 2,
FIG. 8 is a diagram of another measurement analysis result (polar coordinate frequency response) by the loudspeaker of FIG. 2,
FIG. 9 is another measurement analysis result (polar coordinate frequency response) of the loudspeaker of FIG. 2,
FIG. 10 is a diagram illustrating a dip phenomenon of a high frequency band of a conventional loudspeaker,
FIG. 11 is a view showing an example of coverage in a case where an acoustic lens is applied to a high-frequency driver by the loudspeaker of FIG. 2,
FIG. 12 is a diagram illustrating another example of coverage when an acoustic lens is applied to the high-frequency driver by the loudspeaker of FIG. 2,
FIG. 13 is an illustration of coverage in the case of applying an acoustic lens having diameters of 0 mm and 25 mm in FIG. 12,
Fig. 14 is an illustration of polar coordinate data in the case where the acoustic lens is not used for the high-frequency driver by the loudspeaker of Fig. 2,
FIG. 15 is an illustration of polar coordinate data in the case where an acoustic lens is not used for the high-frequency driver by the loudspeaker of FIG. 2,
Fig. 16 is an illustration of polar coordinate data in the case where an acoustic lens is used for the high-frequency driver by the loudspeaker of Fig. 2,
FIG. 17 is a diagram illustrating another polar coordinate data in the case where an acoustic lens is used for the high-frequency driver by the loudspeaker of FIG. 2; FIG.

Hereinafter, the configuration and operation principle of the present invention will be described in detail with reference to FIGS. 2 to 17 attached hereto.

≪ Configuration of a Preferred Embodiment of Loudspeaker System of the Invention >

In the loudspeaker system 1000 according to the present invention,

A coaxial two-way unit 50;

A loudspeaker 100 based on the upper coaxial two way unit 50, having a dodecahedron enclosure structure and disposed in the middle of each side of the dodecahedron;

An acoustic lens 120 used in a high-frequency driver of each of the above loudspeakers 100 for eliminating a high-frequency dip phenomenon; And

A unit 140 for reinforcing bass and treble of the upper loudspeaker 100;

And,

Leading to a uniform sound pressure distribution throughout the space,

Each corner angle of each of the dodecahedron is 57 °, and an angle between two neighboring faces is 72 °.

In this embodiment, when used for music reproduction, the sound of the loudspeakers 100 diffusing sound by the upper loudspeakers 100 in four directions is blocked from being reflected back to the floor after being incident on the ceiling surface And a diffusion plate 200 installed on the ceiling for BGM (background music) so as to prevent the interference phenomenon caused by the ceiling reflection sound from occurring in the listening area.

Also, in this embodiment, in order to improve the frequency characteristics of the low and high frequency bands, the frequency response characteristic is set to +/- 3 dB deviation in the band of 100 Hz to 20 KHz, and the sound pressure level (SPL) in the reproduction band is 95 dB ~ 100dB, and it is characterized by improved high frequency characteristics when applied to music playback and architectural sound measurement products.

Also, in this embodiment, the upper acoustic lens 120 is a spherical acoustical lens having a diameter of 25 mm, and the coverage angle at this time preferably has a positive directivity characteristic of 120 deg. Throughout the frequency range.

FIG. 2 shows the outer configuration of a dodecahedron loudspeaker 100 using a coaxial two-way unit according to the present invention and has a 12-sided enclosure design. In other words, a loudspeaker is arranged in the center of each surface in a regular dodecahedral structure. Each corner of each side is 57 degrees, and the angle between two neighboring sides is 72 degrees.

3 shows characteristic curves through the frequency response and impedance curves of the loudspeaker 100 of FIG. 2 according to the present invention. In Fig. 3, the low sound range of 0 to 400 Hz and the high sound range of 2K to 20K are improved as compared with the conventional one, and a more clear sound is obtained. That is, it is confirmed that the performance of the loudspeaker 100 according to the present invention is superior to that of the conventional loudspeaker in this characteristic curve.

Fig. 4 shows a wiring diagram of the loudspeaker system of Fig. 2 according to the present invention. The left side is an example of wiring of woofers which are bass reproduction speakers and the right side is an example of wiring of tweeters which are speakers for high frequency reproduction. For a woofer, the resistance of the parallel connection of the loudspeaker system is 6 ohms, and for tweeters the resistance of the connection of the louver system connected in parallel is 6 ohms. In this case, the internal resistance of each of the woofer and the tweeter is 8 ohms.

The loudspeaker systems according to the present invention may be installed in one or more of the high ceilings of a large shopping mall, or one of the loudspeaker systems may be installed in the ceiling of a restaurant with a low ceiling. Alternatively, the loudspeaker system may be installed on a low-profile support spindle with three-leg support. This installation can be arranged in various positions in various numbers depending on the field conditions in which the speakers are installed.

FIG. 5 schematically illustrates a method of processing sound ceiling diffusions by the loudspeaker 100 of FIG. 2 according to the present invention. That is, the sound emitted from each surface of the loudspeaker 100 according to the present invention is straightened on each surface, diffused by the diffuser plate 200 installed on the ceiling, .

The loudspeaker system according to the present invention having such a configuration has various advantages. It has a unit to reinforce bass and treble, distributes sound pressure evenly throughout the room, and allows one to play sound in a large space with a single speaker system. It can reproduce sounds with high intelligibility , It is possible to reproduce the natural sound and rich sound. These results are supported by the following measurement analysis results. Now, the results of the analysis will be used to confirm the superiority of the loudspeaker according to the present invention.

FIG. 6 shows a measurement analysis result by the loudspeaker 100 of FIG. 2 according to the present invention. The horizontal axis of this curve is the frequency axis, and the vertical axis is the decibel axis. In this case, the frequency response characteristic has +/- 3dB deviation in the 100Hz ~ 20KHz band, which shows that the frequency characteristics of the low and high frequency band are greatly improved, and the Band Pass SPL in the reproduction band achieves a high output of 95dB ~ 100dB Respectively. Compared with the case of FIG. 1, the performance of the loudspeaker 100 according to the present invention is superior at low frequencies as compared with the prior art, and superior at high frequencies.

FIG. 7 shows the measurement results of the loudspeaker 100 of FIG. 2 according to the present invention in a polar compilation frequency response. The experimental conditions in this case are as follows:

Frequency: 248.4Hz

dB / dlv: 5

Center: 41.5dBS

Outer: 101.5dBS

In this case, the characteristic curve shows a stable value with almost circular shape.

FIG. 8 shows the results of another measurement analysis by the loudspeaker 100 of FIG. 2 according to the present invention in a polar coordinate frequency response curve. The experimental conditions in this case are as follows:

Frequency: 1.005kHz

dB / dlv: 5

Center: 34.9dBS

Outer: 94.9dBS

In this case, the characteristic curve is less stable than the case shown in FIG. 7, and thus shows a somewhat distorted shape in the circular shape.

FIG. 9 shows another measurement analysis result by the loudspeaker 100 of FIG. 2 according to the present invention in a polar coordinate frequency response curve. The experimental conditions in this case are as follows:

Frequency: 8.021kHz

dB / dlv: 5

Center: 35.66dBS

Outskirts: 95.66dBS

In this case, the characteristic curve has a lower sense of stability than the case of FIG. 8, and thus shows a more distorted shape in the circle.

FIG. 10 shows a high-band deep phenomenon of a loudspeaker according to the prior art. The left side of FIG. 10 shows the measurement result of the conventional loudspeaker as a polar coordinate type frequency response curve. In this case, the experimental conditions are as follows:

Frequency: 16.021kHz

dB / dlv: 5

Center: 38.17dBS

Outskirts: 98.17dBS

In this case, the characteristic curve is much less stable than the case of FIGS. 7 to 9, resulting in a very distorted shape in the circle. On the right side of FIG. 10, the low-range coverage is large, but the high-range coverage is much narrower than the low-range. In other words, it is confirmed that the dip phenomenon occurs in the high frequency band of the frequency response characteristic curve and the frequency response tendency loses balance.

In contrast, in the loudspeaker 100 of the present invention, the acoustic lens 120 is applied to the high-frequency driver in order to eliminate the dip phenomenon in the high frequency band. FIG. 11 shows a case where the acoustic lens 120 is applied to the high-frequency driver by the loudspeaker 100 of FIG. 11 shows a state in which the acoustic lens is arranged in the speaker, and the upper part in the right drawing shows the case where the acoustic lens is not used in the loudspeaker 100 according to the present invention, Is used. In FIG. 11, when an acoustic lens is not used, a dip phenomenon appears at about 80.degree. At 10 kHz. However, when the acoustic lens 120 is used, the angle is improved to about 130.degree. At 10 kHz. That is, a case in which a spherical acoustical lens 120 having a diameter of 25 mm is applied is shown in FIG. 11, in which the coverage has been extended from 100 DEG to 120 DEG. From this, it can be confirmed that the dip phenomenon of the loudspeaker of the present invention is greatly improved by the application of the acoustic lens.

FIG. 12 shows the coverage when the acoustic lens 120 of various diameters of 20 to 50 mm is applied to the high-frequency driver by the loudspeaker 100 of FIG. 2 according to the present invention. Shows the coverage when the diameter is 0 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, and 50 mm. From these results, it can be seen that spherical lenses with a diameter of 25 mm (curve marked with green) are improved in high frequency range and can provide uniform coverage over the entire frequency band.

FIG. 13 shows the coverage when the acoustic lens 120 having a diameter of 0 mm and a diameter of 25 mm is applied in FIG. In the case where the acoustic lens 120 having a diameter of 0 mm is applied, the coverage when the acoustic lens 120 having a diameter of 25 mm is applied is about 120 degrees, and the case where the diameter is 25 mm has a much wider coverage area Able to know.

14 and 15 are diagrams illustrating polar coordinate data in the case where the acoustic lens is not used for the high-frequency driver of the loudspeaker 100 of FIG. 2 according to the present invention. Fig. 14 is a graph showing the relationship between the frequency of 1 KHz and the angle of 150 degrees; Frequency is 1.25 KHz, angle is 75 degrees; Frequency is 1.6 KHz, angle is 90 degrees; Frequency is 2KHz, angle is 100 °; Frequency is 2.5 KHz, angle is 100 degrees; Frequency is 3.15 KHz, angle is 80 degrees; Frequency is 4KHz, angle is 120 °; Frequency 5KHz, angle 105 °; Experimental data when the frequency is 6.3 KHz and the angle is 95 °. And Fig. 15 is a graph showing the relationship between the frequency of 8 KHz and the angle of 90 [deg.]; Frequency is 10KHz, angle is 80 °; Frequency is 12.5 KHz, angle is 105 [deg.]; Experimental data for a frequency of 16 KHz and an angle of 90 degrees.

14 and 15, it can be seen that the coverage angle is narrow at the frequency.

On the other hand, FIGS. 16 and 17 show polar coordinate experimental data when the acoustic lens 120 is used for the high-frequency driver of the loudspeaker 100 of FIG. 2 according to the present invention. 16 is a graph showing the relationship between a frequency and a frequency of 1 KHz, an angle of 150 degrees; Frequency is 1.25 KHz, angle is 90 degrees; Frequency is 1.6 KHz, angle is 120 degrees; Frequency is 2KHz, angle is 110 °; Frequency is 2.5 KHz, angle is 105 [deg.]; Frequency is 3.15 KHz, angle is 80 degrees; Frequency is 2KHz, angle is 110 °; Frequency is 2.5 KHz, angle is 105 [deg.]; Experimental data for a frequency of 3.15 KHz and an angle of 80 °. And Fig. 15 is a graph showing the relationship between the frequency of 8 KHz and the angle of 1100 deg. Frequency is 10KHz, angle is 130 °; A frequency of 12.5 KHz, an angle of 125 DEG; Experimental data for a frequency of 16 KHz and an angle of 105 degrees.

16 and 17, it can be seen that the coverage angle at the frequency is wider than the experimental results shown in Figs. 15 and 16. Accordingly, it can be seen that the performance of the loudspeaker 100 is improved by using the acoustic lens in the high-frequency driver of the present invention.

As such, the present invention can be variously modified and can take various forms, and the detailed description of the present invention has only described specific embodiments thereof. It is to be understood, however, that this invention is not limited to the particular forms set forth in the foregoing description, but rather includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

This invention is a technology that is directly applicable to a speaker technology used in everyday life and is highly industrially applicable. Especially, it provides a solution which can reliably measure in a large space by solving the problem that the high sound reproduction characteristic is not good and the high SPL can not be provided in the construction acoustic measurement, can do.

50: coaxial two-way unit
100: Loudspeaker
120: Acoustic lens
140: Unit to reinforce bass and treble
200: diffusion plate
1000: Loudspeaker system

Claims (4)

A coaxial two-way unit 50;
A loudspeaker 100 based on the upper coaxial two way unit 50, having a dodecahedron enclosure structure and disposed in the middle of each side of the dodecahedron;
An acoustic lens 120 used in a high-frequency driver of each of the above loudspeakers 100 for eliminating a high-frequency dip phenomenon; And
A unit 140 for reinforcing bass and treble of the upper loudspeaker 100;
And,
Leading to a uniform sound pressure distribution throughout the space,
Wherein each corner angle of the dodecahedron is 57 degrees and an angle between two adjacent faces is 72 degrees. The sound of the loudspeakers 100 diffusing sound by the upper loudspeakers 100 in four directions is incident on the ceiling surface and then the sound reflected from the floor is blocked , And a diffuser plate (200) installed on the ceiling for BGM (background music) so that interference phenomenon caused by the ceiling reflection sound does not occur in the listening area. The method of claim 2, wherein in order to improve the frequency characteristics of the low band and the high band, the frequency response characteristic has +/- 3 dB deviation in the band of 100 Hz to 20 KHz, and the band pass sound pressure level (SPL) 100dB, and the high frequency characteristics are improved when applied to music playback and architectural sound measurement products. The loudspeaker system of claim 1, wherein the upper acoustic lens (120) is a spherical acoustic lens with a diameter of 25 mm, wherein the coverage angle has a positive directional characteristic at 120 degrees across the frequency range.

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