CN107205194B - Sound box and sound box system - Google Patents

Sound box and sound box system Download PDF

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CN107205194B
CN107205194B CN201710423095.1A CN201710423095A CN107205194B CN 107205194 B CN107205194 B CN 107205194B CN 201710423095 A CN201710423095 A CN 201710423095A CN 107205194 B CN107205194 B CN 107205194B
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sound
sound channel
channel
box
box body
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CN107205194A (en
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鞠波
段炜
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics

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  • Acoustics & Sound (AREA)
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Abstract

The invention provides a sound box and a sound box system, wherein the sound box comprises: a box body and a sound channel; the box body is provided withA speaker mounting hole; one end of the sound channel is closed, and the other end of the sound channel is communicated with the interior of the box body; the length L of the sound channel satisfies:
Figure 831768DEST_PATH_IMAGE001
(ii) a Wherein N is an integer greater than or equal to zero; lambda is the wavelength of the sound wave corresponding to the target frequency;
Figure 733865DEST_PATH_IMAGE002
for adjusting the amount, and
Figure 276842DEST_PATH_IMAGE003
. The back vibrating diaphragm vibration of speaker, the sound wave is after sending from speaker back vibrating diaphragm, transmits in the sound passageway to being reflected and returning by confined one end from the sound passageway, offsetting with the sound wave antiphase that speaker back vibrating diaphragm sent, make the acoustic pressure can't restrict the vibration range of vibrating diaphragm at the low frequency again, thereby make the audio amplifier can realize lower low frequency dive, make the bass effect of audio amplifier better.

Description

Sound box and sound box system
Technical Field
The invention relates to the technical field of acoustics, in particular to a sound box and a sound box system.
Background
With the reduction of the volume of consumer electronic products, such as televisions, audio devices, notebook computers, tablet computers, mobile phones, etc., the volume of the sound box devices installed on these electronic products is also getting smaller. The existing sound box device is generally a closed box body, and a loudspeaker is arranged on the side wall of the box body. And in the very little box of volume, the vibration of speaker for acoustic pressure in the box increases violently, has restricted the vibrating diaphragm at the low frequency vibration range at speaker back, has led to audio amplifier bass resonant frequency to be greater than the free bass resonant frequency of speaker far away, finally causes the low frequency to dive not enough, leads to the bass effect of audio amplifier unsatisfactory.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a sound box and a sound box system, which can use the same speaker in a smaller volume of the sound box, so as to achieve lower low-frequency diving, and make the bass effect of the sound box better.
In a first aspect, an embodiment of the present invention provides a sound box, including: a box body and a sound channel;
the box body is provided with a loudspeaker mounting hole;
one end of the sound channel is closed, and the other end of the sound channel is communicated with the interior of the box body;
the length L of the sound channel satisfies:
Figure DEST_PATH_IMAGE001
；
wherein N is an integer greater than or equal to zero; lambda is the wavelength of the sound wave corresponding to the target frequency;
Figure 415147DEST_PATH_IMAGE002
for adjusting the amount, and
Figure DEST_PATH_IMAGE003
。
with reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where:
the length of the sound channel is less than or equal to one fourth of the corresponding wavelength of the sound wave at the target frequency.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where:
the device also comprises a loudspeaker; the loudspeaker is mounted in the loudspeaker mounting hole;
the cross-sectional area of the sound channel is smaller than the area of the equivalent diaphragm of the loudspeaker.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where: further comprising: a short sound channel;
one end of the short sound channel is closed, and the other end of the short sound channel is communicated with the interior of the box body; and the length of the short sound channel is less than the length of the sound channel, and the length L of the short sound channel0Satisfies the following conditions:
Figure 898081DEST_PATH_IMAGE004
；
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE005
the corresponding wavelength of the sound wave at the second target frequency is obtained;
Figure 370650DEST_PATH_IMAGE006
is an integer greater than or equal to zero;
Figure DEST_PATH_IMAGE007
is a second adjustment amount, and
Figure 36163DEST_PATH_IMAGE008
。
with reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where: the ratio of the length of the sound channel to the short sound channel is greater than 1.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where: the sound channel and/or the short sound channel are both meandering channels.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where: and reinforcing ribs are further arranged on the side walls of the sound channel and/or the short sound channel.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where: further comprising: an inverter tube;
the phase inversion tube is arranged in the box body and communicated with the outside of the box body.
In a second aspect, an embodiment of the present invention further provides an acoustic enclosure system, including: an acoustic enclosure according to any of the first aspect, and a carrier;
the sound box is arranged on the bearing body.
The sound box and the sound box system provided by the embodiment of the invention comprise a box body, wherein the box body is provided with a loudspeaker mounting hole, the loudspeaker can be mounted in the loudspeaker mounting hole, meanwhile, a sound channel is also arranged, one end of the sound channel is closed, the other end of the sound channel is communicated with the inside of the box body, a back vibrating diaphragm of the loudspeaker vibrates, sound waves are transmitted in the sound channel after being emitted from the back vibrating diaphragm of the loudspeaker, and are reflected back from the closed end of the sound channel and offset with the sound waves emitted from the back vibrating diaphragm of the loudspeaker in an opposite phase mode, so that the sound pressure cannot limit the vibration amplitude of the vibrating diaphragm at low frequency any more, the sound box can realize low-frequency dive of cultivated land, and the bass effect of the sound box.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a sound box according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
fig. 4 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
fig. 7 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another sound box provided in the embodiment of the present invention;
illustration of the drawings:
the sound channel structure comprises a box body 100, a sound channel 200, a loudspeaker mounting hole 300, a loudspeaker 400, a reinforcing rib 500, a short sound channel 600, a damping assembly 700 and an inverter tube 800.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The existing acoustic structure of a loudspeaker is mainly a closed box (i.e. a sound box), and an opening is formed in the side wall of the box, and the loudspeaker is installed in the opening. At present, along with the smaller volume of electronic equipment, the required volume of a sound box is smaller and smaller. The smaller the volume of the enclosure, the lower the bass resonance frequency of the loudspeaker
Figure DEST_PATH_IMAGE009
And rise sharply, eventually resulting in insufficient low frequency dive.
In order to make the sound box have lower bass diving, there are several ways: 1. reducing the bass resonance frequency of the loudspeaker by making the elastic system of the loudspeaker soft; however, the poor rate of the loudspeaker is increased, the low-frequency power is reduced, the distortion is increased, meanwhile, the equivalent volume Vas of the loudspeaker is increased, and the low-frequency diving effect is not ideal in practical use; 2. the bass resonance frequency of the loudspeaker is reduced by increasing the mass of the whole loudspeaker system; but this can cause a reduction in the sensitivity SPL of the loudspeaker and the added mass can also undermine the transient response of the loudspeaker; 3. a phase inversion type box body is adopted, namely, a phase inversion tube communicated with the outside is arranged on the side wall of the box body; the nature of the phase inversion cabinet is a speaker driven helmholtz resonator, which requires a sufficient volume of enclosure as a closed cabinet. The sound box is designed by utilizing the Helmholtz resonance principle, and the volume of the box body is far larger than that of the guide pipe. When the volume of the box body is very small, the assumption is not satisfied, and the design formula of the prior phase inversion type box body is not applicable. In fact, when the cabinet volume is small, the bass sound is hardly improved significantly regardless of how the inverter is adjusted, and the inverter is also liable to generate wind noise. However, in either case, when the volume of the case used is very small, there is a problem that the low frequency dive is insufficient.
Based on this, the application provides a audio amplifier and audio amplifier system can make the less box possess better low frequency dive.
For the convenience of understanding the present embodiment, a sound box disclosed in the present embodiment will be described in detail first.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the sound box provided in the embodiment of the present invention specifically includes:
a case 100 and a sound channel 200;
the box body 100 is provided with a loudspeaker mounting hole 300;
one end of the sound channel 200 is closed, and the other end is communicated with the interior of the box body 100;
the length of the sound channel satisfies:
Figure 23710DEST_PATH_IMAGE010
（1）；
wherein N is an integer greater than or equal to zero; lambda is the wavelength of the sound wave corresponding to the target frequency;
Figure DEST_PATH_IMAGE011
for adjusting the amount, and
Figure 310335DEST_PATH_IMAGE003
；
in a box body with a very small volume, the vibration of a vibrating diaphragm on a loudspeaker enables the sound pressure in the box body to be increased violently; the increase of sound pressure limits the vibration amplitude of the vibrating diaphragm at low frequency, and the sound box
Figure 371832DEST_PATH_IMAGE009
Compared with loudspeaker alone
Figure 718500DEST_PATH_IMAGE009
And rises sharply, eventually causing severe shortfalls of low frequencies.
In the embodiment of the invention, the sound box comprises a box body 100, a loudspeaker mounting hole 300 is formed in the box body 100, a loudspeaker can be mounted in the loudspeaker mounting hole 300, meanwhile, a sound channel 200 is also arranged, one end of the sound channel 200 is closed, the other end of the sound channel is communicated with the interior of the box body 100, a back vibrating diaphragm of the loudspeaker vibrates, sound waves are transmitted in the sound channel 200 after being emitted from the back vibrating diaphragm of the loudspeaker, and are reflected back from the closed end of the sound channel 200 and offset with the sound waves emitted from the back vibrating diaphragm of the loudspeaker in an opposite phase mode, so that the sound pressure cannot limit the vibration amplitude of the vibrating diaphragm at low frequency any more, the sound box can realize low-frequency dive of cultivated land, and the bass effect of the.
Theoretically, if the reflected sound wave can be completely offset with the sound wave emitted by the vibrating diaphragm at the back of the loudspeaker, the loudspeaker is equivalently arranged in a box body with an infinite volume, and the low frequency which can be reached by the loudspeaker is the low frequency which can be reached by the sound box; in practice, however, the reflected sound wave can not be completely cancelled but only partially cancelled by the sound wave emitted from the diaphragm at the back of the loudspeaker, and therefore, only the low frequency near the target frequency (i.e. the bass frequency that the sound box is allowed to reach) can be improved, and the improvement range is small.
In the specific implementation, the size of the box 100 can be specifically set according to the actual situation, and since the box is mainly applied to smaller electronic devices such as mobile phones and tablet computers, the box 100 can be made as small as possible as long as a speaker can be installed.
In the process of transmitting sound waves in the sound channel, one end of the sound channel 200 is sealed, the sound waves are pressed by the loudspeaker to be driven to the sealed end of the sound channel 200 and then reflected back to the box body 100 for mounting the loudspeaker, the reflected sound waves and the sound waves emitted by the loudspeaker have phase difference, so that the sound pressure in the loudspeaker can be completely or partially offset, for the target frequency and the frequency near the target frequency, the volume of the box body is increased, the constraint received by the amplitude of the vibrating diaphragm is reduced, the amplitude of vibration is increased, and the output of low frequency is increased.
For example, since V = λ × F, where V is the sound velocity, λ is the wavelength corresponding to the target frequency, and F is the target frequency, if the path length of sound propagation is equal to one wavelength, the phase difference is 360 degrees, then the sound pressure in the cabinet cannot be cancelled, the amplitude of the speaker is limited to the maximum, and the output sound pressure is the lowest; if the path length of sound transmission is equal to half wavelength and the phase difference is 180 degrees, then the sound pressure in the box is counteracted to the maximum degree, namely completely counteracted, the amplitude of the loudspeaker is limited to the minimum, and the output sound pressure is highest; if the sound propagation length is equal to 1/4 or 3/4 wavelength, the phase difference is 90 degrees/270 degrees, the sound pressure in the box is smaller than 360 degrees and larger than 180 degrees, and the output sound pressure is between 180 degrees and 360 degrees; if the sound transmission length is within a certain interval of half wavelength, the phase difference should be within a certain interval of about 180 degrees, the sound pressure in the box is partially offset, the amplitude of the loudspeaker is limited, and the output sound pressure is less than the highest sound pressure.
In fact, the length of the sound channel 200 may be specifically set according to actual needs, and is not necessarily a quarter of the wavelength corresponding to the target frequency, but it is only required that the length is such that the rebounded sound wave reaches the inside of the cabinet 100 and has a certain phase difference (for example, 180 °, the phase difference may also be within a certain interval, for example, within an interval of 160 ° -200 °) with respect to the sound wave emitted by the diaphragm at the back of the speaker, so as to achieve partial cancellation or complete cancellation of the sound wave. However, in order to reduce the volume of the whole sound box as much as possible, the sound channel should be made as small as possible, so in formula (1), N is generally 0, and the adjustment amount should be adjusted to achieve maximum sound pressure cancellation
Figure 131027DEST_PATH_IMAGE011
Also needs to be 0. That is to say that the first and second electrodes,
the length L of the acoustic channel 200 has the following relationship with the corresponding wavelength λ of the acoustic wave at the target frequency:
Figure 722807DEST_PATH_IMAGE012
（2）；
such that the length of the acoustic channel 200 is equal to one quarter of the corresponding wavelength of the acoustic wave at the target frequency.
If the volume of the box body and the sound channel is further reduced, the volume of the box body and the sound channel can be reduced
Figure 904390DEST_PATH_IMAGE011
Set to a value less than 0, i.e. such that the actual length of the sound channel is less than a quarter of the corresponding wavelength of the sound wave at the target frequency.
In addition, it is provided with
Figure 94063DEST_PATH_IMAGE011
And the center of the vibrating diaphragm at the back of the loudspeaker is away from the strong connection part of the sound channel and the loudspeaker, although the distance is very small, the center still can have certain influence on the sound box, and therefore the loudspeaker is provided with
Figure 56202DEST_PATH_IMAGE011
To eliminate the effect of this distance.
In addition, the length of the sound channel should also be set such that F (target frequency) satisfies formula (3):
Figure DEST_PATH_IMAGE013
（3）
or F and
Figure 684630DEST_PATH_IMAGE014
the approach is only needed.
Wherein the content of the first and second substances,
Figure 986298DEST_PATH_IMAGE014
is the resonant frequency of the loudspeaker.
And is
Figure 409189DEST_PATH_IMAGE015
（4）
Wherein f is the actual frequency; n is an integer greater than or equal to zero, and when n is an odd number, the corresponding F response is enhanced, and when n is an even number, the corresponding frequency F response has an extremely low valley.
It should be noted that the actual frequency f is the actual operating acoustic frequency, and particularly the positive acoustic frequency sweep, which simulates the frequency response of the actual acoustic frequency in the present invention.
In addition, in various embodiments of the present invention, as shown in fig. 1, a speaker 400 is further included; the speaker 400 is mounted in the speaker mounting hole 300;
the cross-sectional area of the sound channel is smaller than the area of the equivalent diaphragm of the loudspeaker.
In a specific implementation, since one end of the sound channel is closed, sound is not accelerated under the driving of the speaker, but sound wave compression occurs due to the closed sound channel 200. Equivalent diaphragm area S of loudspeaker diaphragm1And the cross-sectional area S of the sound passage2The ratio is the compression ratio k, i.e., k is full of equation (5):
Figure 796308DEST_PATH_IMAGE016
（5）
the larger the compression ratio k, the smaller the volume of the casing 100. If the compression ratio k is too large, the loss of the sound waves after being reflected back is too large, and the problem of poor bass improvement effect is caused; while the compression ratio k is too small, the bass improvement is significant, but at the same time the cabinet 100 also becomes large. In order to achieve a good balance between the bass improving effect and the volume of the cabinet 100, in the embodiment of the present invention, the compression ratio k is greater than 1, i.e., the cross-sectional area of the sound channel is smaller than the area of the equivalent diaphragm of the speaker.
It should be noted that the larger k, the smaller the tank, but the effect of bass diving becomes worse, and the most k satisfies:
Figure 166110DEST_PATH_IMAGE017
in addition, in the embodiments of the present invention, since the sound wave is a longitudinal wave, which is compressed by the pressure of the speaker when propagating in the sealed sound channel, the wavelength is actually shorter than the time of propagating in the non-sealed sound channel, so that the actually required sound channel length is shorter. Finally, the lower the target frequency is, the smaller the compression effect is, the higher the target frequency is, and the larger the compression effect is, so that the volume of the sound box can be made small.
As shown in fig. 2, in the sound box provided by the embodiment of the present invention, the shape of the sound channel 200 may be bent, that is, the total length of the sound channel satisfies the length requirement in the embodiment of the present invention, and it is not necessary to provide a straight channel, so that the sound box is easier to mount on the device.
Referring to fig. 3, in the sound box according to the embodiment of the present invention, a reinforcing rib 500 is further disposed on a side wall of the sound channel. The setting of strengthening rib 500 makes the lateral wall of audio amplifier have better support dynamics, simultaneously, owing to there is the strengthening rib for the support dynamics of sound passageway is enough, consequently can be with the comparison of being done of the lateral wall of sound passageway thinner, thereby further reduces the whole volume of audio amplifier.
It should be noted that when the embodiment of the present invention includes the short sound channel, the short sound channel may also be a bent channel; the side walls of the short sound channels may also be provided with ribs.
In addition, in each embodiment of the invention, the sound channel can be bent and folded, that is, the sound channel can be regarded as formed by connecting a plurality of communicated sub-channels, and part of the sub-channels share the same channel side wall, so that the shared channel side wall has certain reinforcing effect on the strength of the side wall of the sound channel, namely, the shared channel side wall is equivalent to a reinforcing rib, therefore, on the premise of not separately arranging the reinforcing rib, the strength of the side wall of the bent and folded sound channel is enough, the side wall of the sound channel can be thinner, and under the condition that the diameter of the sound channel is unchanged, the volume of the sound channel can be reduced, thereby reducing the volume of the whole sound box.
Referring to fig. 4, the sound box according to the embodiment of the present invention further includes a short sound channel 600.
One end of the short sound channel 600 is closed, and the other end is communicated with the inside of the case 100; and the length of the short sound channel 600 is smaller than the length of the sound channel 200.
In the specific implementation, because the sound box provided by the embodiment of the invention actually has a frequency selection characteristic, the finally obtained strengthened bass bandwidth is narrower. To increase the bandwidth, the short sound channel 600 is added.
Wherein the length L of the short sound channel 6000Satisfies formula (6):
Figure 620487DEST_PATH_IMAGE018
（6）
wherein the content of the first and second substances,
Figure 417542DEST_PATH_IMAGE005
the corresponding wavelength of the sound wave at the second target frequency is obtained;
Figure 88695DEST_PATH_IMAGE006
is an integer greater than or equal to zero;
Figure 262187DEST_PATH_IMAGE007
is a second adjustment amount, and
Figure 335185DEST_PATH_IMAGE008
。
it is noted that the formula for calculating the short sound channel and the various conditions to be satisfied are substantially similar to the sound channel, and the short sound channel is arranged to substantially add a narrow band enhancement band of a higher center frequency (i.e., a second target frequency higher than the target frequency) to the narrow band enhancement band of the target frequency corresponding to the sound channel to complement each other, thereby complementing the frequency selectivity.
As described above, the present housing can employ comparatively long sound channels and short sound channels. Longer sound channels improve lower bass frequencies and short sound channels improve higher bass frequencies. Lower frequencies allow deeper sound dive, higher bass frequencies increase the intensity of the bass. Especially for a long sound channel, the low frequency can be submerged deeper by increasing the length of the sound channel, but the sound pressure is also reduced, so the submergence degree of the low frequency is considered by the size of the sound pressure, and cannot be reduced at one step. Similarly, for the same length of the sound channel, the lower the compression ratio, the higher the sound pressure.
Referring to fig. 5, in the sound box provided in the embodiment of the present invention, the short sound channel is further provided with a sound box including: a damping assembly 700;
the damping component can make the vibration amplitude of the sound wave transmitted to the short sound channel 600 decline gradually, and the properly increased damping component can reduce the quality factor Q of the short sound channel, so that the peak value of the improved frequency band is reduced, the attenuation slope of the frequency band is reduced, and the frequency connection of two sound channels with different lengths is improved. Wherein, the size of the damping component can be specifically adjusted according to the actual adjustment condition,
because the short sound channel is shorter in length, the sound wave is less lost when being transmitted in the short sound channel, so that the compression ratio can be further increased, for example, the compression ratio is larger than 6:1, and the whole length of the sound box is further reduced.
It should be noted that the sound channel and the short sound channel mentioned in the embodiments of the present invention are enhanced for specific frequencies. But actually includes, but is not limited to, these two. Using 3 or more sound channels allows for more fine tuning. However, this increases the volume of the enclosure and the excessive sound channels also increase the difficulty of the design. The shape and the bending mode of the specific sound channel are not fixed, and the sound channel can be designed into various shapes according to actual needs.
For example, as shown in fig. 6 and 7, in the sound box, the sound channels and the short sound channels are arranged: both adopt a scheme of one sound channel and one short sound channel, and the length ratio of the sound channel to the short sound channel is more than 1. Preferably, the ratio of the length of the sound channel to the short sound channel is the recommended value 3: 2. The right angle and the acute angle in the sound channel are avoided as much as possible, measures such as some chamfers or fillets can be added, and sound wave transmission is assisted.
In addition, since the second target frequency (short sound channel) is intended to compensate for the dip in frequency response produced by the first target frequency (long sound channel), the center frequency of the second frequency needs to be set in the vicinity of the dip in frequency response produced by the first target frequency.
Meanwhile, in order that the second target frequency is higher than the frequency response valley of the first target frequency as much as possible, the quality factor of the second target frequency is reduced by the damping process.
Referring to fig. 8, the sound box provided in the embodiment of the present invention further includes: an inverter tube 800.
The inverter tube 800 is installed inside the case and is communicated with the outside of the case.
The volume of the box body can be equivalently increased near a specific frequency, and the frequency with lower frequency enhanced by the long sound channel is tuned by using the phase-reversing tube, so that the low-frequency response is further widened.
An embodiment of the present invention further provides a sound box system, including: the sound box according to any one of the above embodiments, further comprising a carrier;
the sound box is arranged on the bearing body.
In particular, the carrier may be a device requiring a sound box to be installed, such as a television, a sound box, a notebook computer, a tablet computer, a mobile phone, and the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. An acoustic enclosure, comprising: a box body and a sound channel;
the box body is provided with a loudspeaker mounting hole;
one end of the sound channel is closed, and the other end of the sound channel is communicated with the interior of the box body, wherein the cross-sectional area of the sound channel is smaller than the area of the equivalent vibrating diaphragm of the loudspeaker;
the length L of the sound channel satisfies:
Figure 364115DEST_PATH_IMAGE001
；
wherein N is an integer greater than or equal to zero; lambda is the wavelength of the sound wave corresponding to the target frequency;
Figure 522564DEST_PATH_IMAGE002
for adjusting the amount, and
Figure 234168DEST_PATH_IMAGE003
；
the target frequency F satisfies:
Figure 161673DEST_PATH_IMAGE004
(ii) a Wherein the content of the first and second substances,
Figure 300530DEST_PATH_IMAGE005
is the resonant frequency of the loudspeaker.
2. An acoustic enclosure according to claim 1,
the length of the sound channel is less than or equal to one fourth of the corresponding wavelength of the sound wave at the target frequency.
3. The acoustic enclosure of claim 2, further comprising a speaker; the speaker is mounted in the speaker mounting hole.
4. An acoustic enclosure according to any one of claims 1 to 3, further comprising: a short sound channel;
one end of the short sound channel is closed, and the other end of the short sound channel is communicated with the interior of the box body; and the length of the short sound channel is smallThe length of the sound channel and the length L of the short sound channel0Satisfies the following conditions:
Figure 447740DEST_PATH_IMAGE006
；
wherein the content of the first and second substances,
Figure 697456DEST_PATH_IMAGE007
the corresponding wavelength of the sound wave at the second target frequency is obtained;
Figure 682729DEST_PATH_IMAGE008
is an integer greater than or equal to zero;
Figure 54805DEST_PATH_IMAGE009
is a second adjustment amount, and
Figure 125529DEST_PATH_IMAGE010
。
5. an acoustic enclosure according to claim 4, wherein the ratio of the length of the sound channel to the short sound channel is greater than 1.
6. An acoustic enclosure according to claim 4, wherein the acoustic channel and/or the short acoustic channel are both meandering channels.
7. An acoustic enclosure according to claim 4, wherein the side walls of the acoustic channel and/or the short acoustic channel are provided with reinforcing ribs.
8. The acoustic enclosure of claim 5, further comprising: an inverter tube;
the phase inversion tube is arranged in the box body and communicated with the outside of the box body.
9. An acoustic enclosure system, comprising: an acoustic enclosure as claimed in any one of claims 1 to 8, and a carrier;
the sound box is arranged on the bearing body.
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