Multi-port speaker device using two resonators

Abstract

The present invention comprises: a first resonator having a box shape, and having a port hole formed at an upper side thereof to communicate with the outside; a high-frequency speaker unit provided at an upper inner side of the first resonator; a low-frequency speaker unit provided at an inner middle side of the first resonator; a port provided in the port hole so as to communicate the inside of the first resonator with the outside; and a second resonator having one end connected to an end portion of the port, a middle part exposed to the outside, and the other end that passes through the lower side of the first resonator and is exposed to the lower side of the front surface of the first resonator so that ultra-low frequency sound is radiated forward, wherein the second resonator includes: an upper horizontal pipe which is horizontally connected to the end portion of the port and which has cross-sectional area larger than that of the port; a vertical pipe which is vertically connected to an end portion of the upper horizontal pipe and which has a cross-sectional area relatively smaller than that of an upper horizontal duct; a lower horizontal pipe, which is horizontally connected to an end portion of the vertical pipe, has an end portion inserted into the lower side of the first resonator, and has the same cross-sectional area as that of the vertical pipe; a directivity-enhancing pipe which is horizontally connected to the end portion of the lower horizontal pipe and which has an end portion exposed to the lower side of the front surface of the first resonator; and an outside-air inlet pipe, which is provided, inside the first resonator, outside the end portion of the lower horizontal pipe and outside the directivity-enhancing pipe, has an end portion exposed at the lower side of the front surface of the first resonator, and has, on both sides of the inside thereof, an outside-air inlet path providing at both inner sides thereof and allowing the inside of the first resonator to communicate with the outside according to separation distances from both sides of the outside of the directivity-enhancing pipe.

Description

Multi-port speaker device using two resonators

[0001] The present invention relates to a multi-port speaker device using two resonators that radiate sound corresponding to an electrical signal input from a power amplifier through a speaker unit installed inside an enclosure.

[0002] Generally, an enclosure speaker is a device in which one or more speaker units are installed in a box-shaped enclosure, and sound is output forward through the speaker units in response to electrical signals input from an external device.

[0003] These enclosure speakers are classified into bass-reflex ported, transmission-line, generation, and portless sealed types; among these, bass-reflex ported enclosure speakers utilize the Holm-Holtz resonance principle, offering the advantage of effectively outputting low-frequency sound compared to enclosure speakers of the same size.

[0004] Here, bass-reflex (RF) ported enclosure speakers are classified into rear-ported and front-ported types depending on the port location. The rear-ported type is a structure designed to utilize sound radiated backward by the speaker unit, but it has disadvantages such as sound scattering, distortion, phase mismatch across frequency bands, and attenuation due to the rearward radiation. The front-ported type is a structure designed to resolve the disadvantages of the rear-ported type, but it has the disadvantage of producing a muddy output as ultra-low frequency sounds not output by the speaker unit mix with standing waves in the mid-low and low frequency ranges.

[0005] Furthermore, transmission line type enclosure speakers, which feature a structure where the transmission line connected to the port is installed inside the enclosure, are suitable for compensating for the shortcomings of bass-reflex port types; however, they have the disadvantage of not being able to form a large market share because designing the transmission line is very difficult depending on the size of the speaker unit, securing the length of the transmission line to match the enclosure size is very challenging, and they require a power amplifier of sufficient capacity.

[0006] Due to these drawbacks, a subwoofer system is used that adds a subwoofer unit to the enclosure speaker and power amplifier to ensure smooth radiation of ultra-low frequency sound.

[0007] In this case, the subwoofer system additionally requires a crossover device to connect the enclosure speaker and the subwoofer unit, which is used to precisely adjust the frequency, gain, and phase of the sound output from the enclosure speaker and the sound output from the subwoofer unit to match the type of music or the surrounding environment.

[0008] In other words, subwoofer systems have the disadvantage of requiring more crossover devices and repeated precise adjustments through the crossover devices to match changes in the type of music or surrounding environment, which takes up a lot of installation space and is economically inefficient.

[0009] Therefore, there is a need to develop a speaker device with a structure capable of radiating ultra-low frequency sound forward using an enclosed speaker without adding a crossover device, thereby minimizing installation space and being economically efficient, while naturally harmonizing it with low, mid-low, and high frequency sounds.

[0010] The present invention was developed to resolve the aforementioned problems, and aims to provide a multi-port speaker device using two resonators that can radiate ultra-low frequency sound forward while naturally harmonizing with low, mid-low, and high frequency sounds without adding a crossover device, thereby minimizing installation space, reducing costs, and mitigating ultra-low frequency noise issues.

[0011] The objectives of the present invention are not limited to those mentioned above, and other unmentioned objectives may be clearly understood from the descriptions below and may be sufficiently included in the objectives of the present invention.

[0012] A multi-port speaker device using two resonators according to the present invention for achieving the above objective comprises: a first resonator having a box shape and having a port hole formed on the upper side communicating with the outside; a high-frequency speaker unit installed on the upper side inside the first resonator; a low-frequency speaker unit installed on the middle side inside the first resonator; a port installed in the port hole communicating the interior of the first resonator with the outside; and a second resonator having one end connected to the end of the port, with the middle part exposed to the outside and the other end penetrating the lower side of the first resonator and the other end exposed to the lower front side of the first resonator to radiate ultra-low frequency sound forward; wherein the second resonator comprises an upper horizontal tube horizontally connected to the end of the port and having a cross-sectional area relatively larger than that of the port; and a vertical tube vertically connected to the end of the upper horizontal tube and having a cross-sectional area relatively smaller than that of the upper horizontal duct. It may be composed of: a lower horizontal tube horizontally connected to the end of the vertical tube, the end of which is inserted into the lower side of the first resonator, and having the same cross-sectional area as the vertical tube; a straightness reinforcing tube horizontally connected to the end of the lower horizontal tube, the end of which is exposed to the lower front side of the first resonator; and an external air inlet tube provided inside the first resonator on the outer side of the end of the lower horizontal tube and the outer side of the straightness reinforcing tube, the end of which is exposed to the lower front side of the first resonator, and having an external air inlet path formed on both internal sides to communicate the interior of the first resonator with the outside according to the spacing from both external sides of the straightness reinforcing tube.

[0013] The multi-port speaker device using two resonators according to the present invention with the above-described configuration can expect the following effects.

[0014] First, a second resonator is provided with one end connected to the port end of the first resonator, penetrating the lower side of the first resonator, with the middle part exposed to the outside and the other end exposed to the front lower side of the first resonator, so that ultra-low frequency sound is radiated forward. Since ultra-low frequency sound is radiated forward while naturally harmonizing with low, mid-low, and high frequency sounds without adding a crossover device, it is possible to provide high-quality sound at a relatively low cost, making it highly economically efficient, and also allows for the minimization of volume, thereby resolving space constraints during installation.

[0015] In addition, the second resonator further includes an external air inlet pipe that introduces external air into the interior of the first resonator. As external air corresponding to the ultra-low frequency sound radiated to the lower front of the first resonator by the second resonator is rapidly introduced into the interior of the first resonator, the loss of air energy in the first resonator (200) is eliminated, thereby further increasing the gain of the ultra-low frequency sound and minimizing the change in wavelength, as well as eliminating the problem of ultra-low frequency noise.

[0016] FIG. 1 is a front perspective view illustrating a multi-port speaker device using two resonators according to a preferred embodiment of the present invention.

[0017] FIG. 2 is a rear perspective view illustrating a multi-port speaker device using two resonators according to a preferred embodiment of the present invention.

[0018] FIG. 3 is a vertical cross-sectional view illustrating a multi-port speaker device using two resonators according to a preferred embodiment of the present invention.

[0019] Figure 4 is a cross-sectional view of the lumbar region along the line "AA" in Figure 3.

[0020] Figure 5 is a cross-sectional view along the "BB" line of Figure 3.

[0021] FIG. 6 is an exemplary diagram illustrating a test environment for comparing the performance of a multi-port speaker device using two resonators according to a preferred embodiment of the present invention with that of a conventional bass-reflex rear-port speaker device.

[0022] Figure 7 is a capture screen of the audio spectrum according to a conventional bass reflex rear port type speaker device.

[0023] FIG. 8 is a capture screen of the audio spectrum according to a multi-port speaker device using two resonators according to a preferred embodiment of the present invention.

[0024] A multi-port speaker device using two resonators according to the present invention for achieving the above objective comprises: a first resonator having a box shape and having a port hole formed on the upper side communicating with the outside; a high-frequency speaker unit installed on the upper side inside the first resonator; a low-frequency speaker unit installed on the middle side inside the first resonator; a port installed in the port hole communicating the interior of the first resonator with the outside; and a second resonator having one end connected to the end of the port, with the middle part exposed to the outside and the other end penetrating the lower side of the first resonator and the other end exposed to the lower front side of the first resonator to radiate ultra-low frequency sound forward; wherein the second resonator comprises an upper horizontal tube horizontally connected to the end of the port and having a cross-sectional area relatively larger than that of the port; and a vertical tube vertically connected to the end of the upper horizontal tube and having a cross-sectional area relatively smaller than that of the upper horizontal duct. It may be composed of: a lower horizontal tube horizontally connected to the end of the vertical tube, the end of which is inserted into the lower side of the first resonator, and having the same cross-sectional area as the vertical tube; a straightness reinforcing tube horizontally connected to the end of the lower horizontal tube, the end of which is exposed to the lower front side of the first resonator; and an external air inlet tube provided inside the first resonator on the outer side of the end of the lower horizontal tube and the outer side of the straightness reinforcing tube, the end of which is exposed to the lower front side of the first resonator, and having an external air inlet path formed on both internal sides to communicate the interior of the first resonator with the outside according to the spacing from both external sides of the straightness reinforcing tube.

[0025] The present invention relates to a multi-port speaker device using two resonators that can radiate sound corresponding to an electrical signal input from a power amplifier through a speaker unit installed inside an enclosure.

[0026] In particular, a major feature of the multi-port speaker device using two resonators according to the present invention is that it can radiate ultra-low frequency sound forward while naturally harmonizing with low, mid-low, and high frequency sounds without adding a crossover device, thereby minimizing installation space, reducing costs, and mitigating noise problems.

[0027] These characteristics can be achieved by a configuration including a second resonator that increases the acoustic gain radiated to the outside of the first resonator, changes it to the ultra-low frequency range, and radiates it back to the front of the first resonator, thereby further enhancing the acoustic gain, directivity, and clarity of the ultra-low frequency range.

[0028]

[0029] A multi-port speaker device using two resonators according to a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0030] A multi-port speaker device (100) using two resonators according to a preferred embodiment of the present invention may be composed of a first resonator (200), a high-frequency speaker unit (300), a low-frequency speaker unit (400), a port (500), and a second resonator (600), as shown in FIGS. 1 to 5.

[0031] First, the first resonator (200) may be formed in a box shape as an enclosure and may have a port hole (210) formed on the upper rear side that communicates with the outside.

[0032] Next, the high-frequency speaker unit (300) is installed on the upper side of the interior of the first resonator (200) and is electrically connected to an external device, a power amplifier, so as to output high-frequency sound corresponding to an electrical signal input from the power amplifier.

[0033] At this time, the high-frequency speaker unit (300) can be installed so that its front surface is exposed to the front surface of the first resonator (200).

[0034] Next, the bass speaker unit (400) is installed on the internal middle side of the first resonator (200) and is electrically connected to a power amplifier together with the treble speaker unit (300) to output low-frequency and mid-low-frequency sounds corresponding to the electrical signal input from the power amplifier.

[0035] At this time, the low-frequency speaker unit (400) can be installed so that its front surface is exposed to the front surface of the first resonator (200), just like the high-frequency speaker unit (300).

[0036] Next, the port (500) is installed in a port hole (210) formed on the rear or side of the first resonator (200) to resonate low-frequency sound.

[0037] Finally, the second resonator (600) is connected at one end to the end of the port (500) at the rear or side of the first resonator (200), penetrates the lower side of the first resonator (200), has its middle part exposed to the outside, and its other end exposed to the lower front side of the first resonator (200), so that it can radiate ultra-low frequency sound to the front of the first resonator (200).

[0038] This is due to the effect of lowering the frequency and increasing the intensity of the sound radiated backward through the port hole (210) of the first resonator (200) as the cross-sectional area of ​​the second resonator (600) varies depending on the position, the total volume of the second resonator (600) is relatively smaller than the total volume of the first resonator (200), and the total length of the second resonator (600) is relatively longer than the vertical length of the first resonator (200).

[0039] Therefore, the second resonator (600) can radiate ultra-low frequency sound forward that cannot be radiated from the high-frequency speaker unit (300) and the low-frequency speaker unit (400) by lowering the frequency of the sound radiated backward through the port hole (210) of the first resonator (200) and increasing the sound gain.

[0040] And as the second resonator (600) radiates ultra-low frequency sound to the front of the first resonator (200), it naturally harmonizes with the low frequency, mid-low frequency, and high frequency sounds from the high-frequency speaker unit (300) and low-frequency speaker unit (400) radiated to the front of the first resonator (200), thereby improving sound clarity and increasing sound gain without adding a crossover device.

[0041] In addition, the second resonator (600) can compensate for the loss of air energy in the first resonator (200) by radiating ultra-low frequency sound to the front of the first resonator (200) and simultaneously allowing external air corresponding to the radiated ultra-low frequency sound to flow rapidly into the interior of the first resonator (200).

[0042] In addition, the second resonator (600) can further increase the gain of the ultra-low frequency sound and minimize the change in its wavelength by allowing a portion of the ultra-low frequency sound radiated forward of the first resonator (200) to be introduced into the interior of the first resonator (200) along with the external air introduced into the interior of the first resonator (200).

[0043] To this end, the second resonator (600) may be composed of an upper horizontal tube (610), a vertical tube (620), an upper connecting tube (630), a lower horizontal tube (640), a lower connecting tube (650), a straightness reinforcing tube (660), and an external air inlet tube (670).

[0044] The upper horizontal tube (610) can be installed horizontally with one end in close contact with the rear or side of the first resonator (200) and connected to communicate with the end of the port (500).

[0045] However, the upper horizontal tube (610) may be circular in cross-section and have a relatively larger cross-sectional area than the port (500) so as to increase the pressure of the air energy output through the port (500).

[0046] And a first sealing pad (611) may be installed between one end of the upper horizontal tube (610) and the first resonator (200) to block the gap and prevent air leakage and resonance.

[0047] Here, the upper horizontal tube (610) can be fixed in close contact with the rear or side of the first resonator (200) via the fixed tube (612).

[0048] The above fixed tube (612) may have a trumpet shape in which the diameter on the side closer to the port (500) is relatively larger than the diameter on the opposite side in order to facilitate the flow of air discharged from the port (500).

[0049] The above vertical tube (620) can be installed vertically such that one end is connected to the other end of the upper horizontal tube (610) and the other end faces the lower side of the first resonator (200).

[0050] At this time, the vertical tube (620) may have a rectangular shape with rounded corners based on the cross-section and may have a relatively smaller cross-sectional area than the upper horizontal tube (610). The vertical tube (620) may be firmly fixed vertically to the first resonator (200) by means of a fixing angle (621) that fixes both ends to the first resonator (200).

[0051] The upper connecting pipe (630) has an elbow shape to connect the other end of the upper horizontal pipe (610) and the one end of the vertical pipe (620), and based on the cross-section, one end may be circular and the other end may be rectangular.

[0052] However, to minimize air flow resistance of the upper connecting pipe (630), the inner upper surface may be curved.

[0053] The lower horizontal tube (640) can be installed horizontally by connecting one end to the other end of the vertical tube (620) and inserting the other end into the lower side of the first resonator (200).

[0054] At this time, the lower horizontal pipe (640) has a rectangular shape with rounded corners based on the cross-section corresponding to the vertical pipe (620) and can have the same cross-sectional area as the vertical pipe (620).

[0055] And a second sealing pad (641) may be installed between one end of the lower horizontal pipe (640) and the first resonator (200) to block the gap and prevent air leakage and resonance.

[0056] The lower connecting pipe (650) has an elbow shape to connect the other end of the vertical pipe (620) and the one end of the lower horizontal pipe (640), and both the one end and the other end may be rectangular in shape based on the cross-section.

[0057] However, the lower connecting pipe (650) may have an inner upper surface that is curved to minimize air flow resistance, just like the upper connecting pipe (630).

[0058] The above-mentioned straightness reinforcing tube (660) is installed such that one end is horizontally connected to the other end of the lower horizontal tube (640) and the other end is exposed to the lower front side of the first resonator (200), thereby reinforcing the straightness of the sound discharged to the front of the first resonator (200) through the lower horizontal tube (640) and further increasing the sound gain.

[0059] To this end, the straightness reinforcing tube (660) may be composed of a straight-line guide tube (661) with one end connected to the other end of the lower horizontal tube (640) and having a diameter that decreases as it goes toward the other end, a straight-line tube (662) with one end connected to the other end of the straight-line guide tube (661) and being a circular tube with a diameter that is maintained constant along the length direction, and an expansion tube (663) with one end connected to the other end of the straight-line tube (662) and being a circular tube with a diameter that increases as it goes toward the end.

[0060] The above external air inlet pipe (670) is provided at the end of the lower horizontal pipe (640) and at both sides of the straightness reinforcing pipe (660) inside the first resonator (200), and the end is exposed to the lower front side of the first resonator (200). Depending on the distance between the internal sides and the external sides of the straightness reinforcing pipe (660), an external air inlet path (674) can be formed to communicate the interior of the first resonator (200) with the outside.

[0061] That is, the outside air inlet pipe (670) allows outside air to flow into the interior of the first resonator (200) through the outside air inlet path (674), thereby preserving the air energy loss of the first resonator (200).

[0062] To this end, the external air inlet pipe (670) may be composed of a partition pipe (671) installed on the outer side of the end of the lower horizontal pipe (640) to partition the external air inlet path (674) and communicate with the interior of the first resonator (200), and a connecting pipe (672) installed on the outer side of the straightness reinforcing pipe (660) and connected to the partition pipe (671) to communicate the partition pipe (671) with the outside, with the end of which is exposed to the outside.

[0063] And the outside air inlet pipe (670) may further include at least one flow velocity enhancing flap (673) installed at an angle along the direction in which outside air flows into each compartment pipe (671) to increase the speed of outside air inflow.

[0064] At this time, the connecting pipe (672) has a shape in which the diameter increases along the longitudinal direction toward the end and then decreases again. That is, the end of the connecting pipe (672) may have a shape that is curved inward toward the center.

[0065] Therefore, the connecting pipe (672) can further improve clarity and gain for ultra-low frequency sound by narrowing the radiation angle for ultra-low frequency sound radiated through the expansion pipe (663) of the straightness reinforcing pipe (660) by the end shape, thereby minimizing and suppressing reflected sound.

[0066]

[0067] Meanwhile, a dustproof soundproof pad (680) and a sound-absorbing sponge (690) can be stacked sequentially on the inner surface of the vertical pipe (620), the lower horizontal pipe (640), and the straightness reinforcing pipe (660).

[0068] The above anti-vibration and anti-sound pad (680) can reduce the resonance frequency generated inside the second resonator (600) and reduce ultra-low frequency acoustic loss from external environments such as temperature, humidity, and wind.

[0069] And the sound-absorbing sponge (690) can absorb the standing wave component generated inside the first resonator (200) and transmitted into the second resonator (600), and convert it into an ultra-low frequency component.

[0070] At this time, the second resonator (200) can naturally form a resonator shape because the cross-sectional area of ​​the vertical tube (620) and the lower horizontal tube (640) is relatively smaller than the cross-sectional area of ​​the upper horizontal tube (610) depending on the installation form of the anti-vibration / soundproof pad (680) and the sound-absorbing sponge (690).

[0071]

[0072] A performance test was conducted to compare the performance of a multi-port speaker device (100) using two resonators according to a preferred embodiment of the present invention with that of a conventional bass-reflex rear-port type enclosure speaker device that is not equipped with a second resonator (600).

[0073] At this time, for the performance test, as shown in Fig. 6, a smart device was placed at a point 3m in front of the speaker device with the speaker device spaced 1m away from the back wall, 2m away from the left wall, and 2m away from the right wall, and while music with emphasized bass was played through the speaker device, an audio spectrum analysis showing frequency and gain was performed using an analyzer program (Spetriode) installed on the smart device.

[0074] As a result of capturing and verifying the audio spectrum for a specific measure of music during the process of conducting a test in the above-mentioned environment, the conventional bass-reflex rear-port type speaker device showed an audio spectrum as shown in FIG. 7, and the multi-port speaker device (100) using two resonators according to an embodiment of the present invention showed an audio spectrum as shown in FIG. 8.

[0075] In this case, the line drawn at the bottom in Figures 7 and 8 represents the real-time frequency and gain according to the playback of music, and the line drawn at the top represents the real-time maximum gain according to the playback of music.

[0076] That is, it can be seen that the multi-port speaker device (100) using two resonators according to an embodiment of the present invention and the conventional bass-reflex rear-port type enclosure speaker device have the same waveform at 150Hz or higher.

[0077] In contrast, conventional bass reflex rear port type enclosure speaker devices reproduce acoustic components in the low and ultra-low frequency ranges of 20 to 150 Hz with low gain, but it can be confirmed that the multi-port speaker device (100) using two resonators according to the embodiment of the present invention reproduces acoustic components in the low and ultra-low frequency ranges of 20 to 150 Hz with high gain.

[0078] And compared to the multi-port speaker device (100) using two resonators according to the embodiment of the present invention, it can be confirmed that the waveform change in the 20~150Hz range of the conventional bass-reflex rear-port type enclosure speaker device occurs relatively more frequently, and thus the distortion of sound occurs depending on the surrounding environmental conditions.

[0079]

[0080] The above-described embodiments are merely exemplary, and various other embodiments modified therefrom are possible for those skilled in the art.

[0081] Therefore, the true technical scope of protection of the present invention should include not only the above embodiments but also other embodiments that are variously modified according to the technical concept of the invention described in the following claims.

[0082] The present invention relates to a multi-port speaker device using two resonators that radiate sound corresponding to an electrical signal input from a power amplifier through a speaker unit installed inside an enclosure.

Claims

1. A first resonator having a box shape and a port hole formed on the upper side that communicates with the outside; A high-frequency speaker unit installed on the upper inner side of the first resonator; A bass speaker unit installed on the internal middle side of the first resonator; A port installed in the above port hole to communicate the interior of the first resonator with the outside; and A second resonator configured with one end connected to the end of the above-mentioned port, the middle part exposed to the outside, and the other end penetrating the lower side of the first resonator and the other end exposed to the lower front side of the first resonator to radiate ultra-low frequency sound forward; The above second resonator An upper horizontal tube horizontally connected to the end of the above port and having a relatively larger cross-sectional area than the above port; A vertical pipe connected vertically to the end of the upper horizontal pipe and having a relatively smaller cross-sectional area than the upper horizontal duct; A lower horizontal tube horizontally connected to the end of the vertical tube, with the end inserted into the lower side of the first resonator, and having the same cross-sectional area as the vertical tube; A straightness-enhancing tube horizontally connected to the end of the lower horizontal tube and having its end exposed to the lower front side of the first resonator; and A multi-port speaker device using two resonators, characterized by comprising: an external air inlet pipe provided on the outer side of the end of the lower horizontal pipe and the outer side of the straightness reinforcing pipe inside the first resonator, the end of which is exposed to the lower front side of the first resonator, and an external air inlet path formed on both internal sides to communicate the interior of the first resonator with the outside according to the spacing from both external sides of the straightness reinforcing pipe.

2. In Paragraph 1, The above straightness reinforcing pipe A straight guide tube connected to the end of the lower horizontal tube above, the diameter of which decreases towards the end; A straight tube connected to the end of the above straight guide tube, which is a circular tube and maintains a constant diameter in the longitudinal direction; and A multi-port speaker device using two resonators, characterized by being composed of a circular tube connected to the end of the straight tube and an expanding tube whose diameter increases toward the end.

3. In Paragraph 2, The above outside air inlet pipe A partition pipe provided on the outer side of the end of the lower horizontal pipe and partitioning the external air inlet passage on both internal sides; and A multi-port speaker device using two resonators, characterized by comprising: a connecting tube provided on the outer side of the straightness reinforcing tube and connected to the partition tube to communicate with the outside, with the end of which is exposed to the outside through the lower front side of the first resonator.

4. In Paragraph 3, The above connecting pipe A multi-port speaker device using two resonators characterized by having a shape in which the diameter increases towards the end along the longitudinal direction and then decreases again.

5. In Paragraph 3, The above outside air inlet pipe A multi-port speaker device using two resonators, characterized by further comprising at least one flow velocity enhancing flap that is inclined along the direction in which outside air flows into each of the compartment tubes to increase the flow velocity of outside air.

Images