CN110958510A

CN110958510A - Sound box

Info

Publication number: CN110958510A
Application number: CN201911411253.7A
Authority: CN
Inventors: 李红梅; 徐世超; 赵燕鹏
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-03

Abstract

The invention discloses a sound box which comprises a shell and a loudspeaker (2) arranged in the shell, wherein the shell comprises a main pipe (4) positioned at the front end of the loudspeaker (2), the main pipe (4) forms a front cavity (1), the front cavity (1) enables sound waves to have high sound pressure level frequency, and the middle part or the end part of the main pipe (4) is provided with an insertion pipe (5) with the sectional area different from that of the main pipe (4) so as to filter the high sound pressure level frequency. By applying the sound box provided by the invention, the front cavity (1) formed by the main pipe (4) generates sound waves with high sound pressure level, the middle part of the main pipe (4) is provided with the insertion pipe (5), the insertion pipe (5) is equivalent to sound load on the main pipe (4) and can cause reflection and transmission of partial sound waves, the sound waves are transmitted through the middle insertion pipe (5), the insertion pipe (5) plays a role of a silencer and plays a filtering role on the frequency of the sound waves with high sound pressure level, so that the filtering curve of the sound box is smoother, and the subjective listening effect is improved.

Description

Sound box

Technical Field

The invention relates to the technical field of audio equipment, in particular to a sound box.

Background

Along with the improvement of aesthetic requirements of modern people, ID design requirements of many functional sound boxes are very challenging, and for reasons such as ID design, the sound box is additionally provided with a front cavity on the premise of better ensuring the sound effect of the sound box, so that an acoustic test curve is peaked, and subjective listening experience is poor.

As shown in fig. 1, the sound box adopts a closed box structure, and a front cavity 1 is arranged at the sound outlet position of a loudspeaker 2. The simulated acoustic frequency response curve is shown in fig. 2, and it can be seen that the acoustic curve is not smooth due to the resonance effect of the front cavity 1, and a large peak appears around 500Hz, so that the listening experience of the user is poor.

In summary, how to effectively solve the problems that the sound box with the front cavity causes the peak of the acoustic test curve, so that the listening experience of the user is poor and the like is the problem that needs to be solved by the technical personnel in the field at present.

Disclosure of Invention

In view of the above, the present invention provides a sound box, and the structural design of the sound box can effectively solve the problem that the sound box with a front cavity has poor listening experience of a user due to the fact that the front cavity causes a peak of an acoustic test curve.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a sound box, includes the casing and install in speaker in the casing, the casing is including being located the main pipe of speaker front end, be responsible for and form the front chamber, the front chamber makes the sound wave appear the frequency of high sound pressure level, the middle part or the tip of being responsible for have with be responsible for the different intubate of sectional area, in order to right the frequency filtering of high sound pressure level.

Preferably, in the above-mentioned sound box, the length of the insertion tube is an odd multiple of the wavelength corresponding to the frequency of one quarter of the high sound pressure level.

Preferably, in the above-mentioned sound box, the length of the insertion tube is three-quarters of the wavelength corresponding to the frequency of the high sound pressure level.

Preferably, in the above-mentioned sound box, the main tube and the insertion tube are concentric circular tubes.

Preferably, in the above-mentioned sound box, the insertion tube is located in the middle of the main tube, and includes a cylindrical surface and end surfaces connected to the upper and lower ends of the cylindrical surface and extending in the radial direction, and the end surfaces are connected to the main tube.

Preferably, in the above-mentioned sound box, the insertion tube is an expansion tube having a cross-sectional area larger than that of the main tube.

Preferably, in the above-mentioned sound box, the insertion tube is a shrink tube having a sectional area smaller than that of the main tube.

Preferably, in the sound box, the pipe wall of the main pipe is provided with a plurality of silencing holes.

Preferably, in the sound box, the plurality of the silencing holes are uniformly distributed on the pipe wall of the main pipe.

The invention provides a sound box which comprises a shell and a loudspeaker. The loudspeaker is arranged in the shell, the shell comprises a main pipe positioned at the front end of the loudspeaker, the main pipe forms a front cavity, the front cavity enables sound waves to have high sound pressure level frequency, and the middle part or the end part of the main pipe is provided with an insertion pipe with a sectional area different from that of the main pipe so as to filter the high sound pressure level frequency.

By applying the sound box provided by the invention, the front cavity formed by the main pipe can generate sound waves with high sound pressure level, the middle part or the end part of the main pipe is provided with the insertion pipe, the insertion pipe is equivalent to sound load to the main pipe and can cause reflection and transmission of partial sound waves, the sound waves are transmitted through the middle insertion pipe, and the insertion pipe plays a role of a silencer, so that the sound box has a filtering effect on the frequency with high sound pressure level in the sound waves, the filtering curve of the sound box is smoother, and the subjective listening effect is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a speaker in the prior art;

FIG. 2 is a graph of simulated acoustic frequency response for the enclosure of FIG. 1;

fig. 3 is a schematic cross-sectional structure view of a sound box according to an embodiment of the present invention;

FIG. 4 is a graph of simulated acoustic frequency response for the enclosure of FIG. 3;

FIG. 5 is a front view of the speaker of FIG. 3;

fig. 6 is a top view of fig. 5.

The drawings are numbered as follows:

the loudspeaker comprises a front cavity 1, a loudspeaker 2, a rear cavity 3, a main pipe 4, a cannula 5, a silencing hole 6 and a rear shell 7.

Detailed Description

The embodiment of the invention discloses a sound box, which aims to solve the front cavity effect of the sound box and improve subjective listening.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3, 5 and 6, fig. 3 is a schematic cross-sectional structure diagram of a sound box according to an embodiment of the present invention; FIG. 5 is a front view of the speaker of FIG. 3; fig. 6 is a top view of fig. 5.

In one embodiment, the present invention provides an acoustic enclosure comprising a housing and a loudspeaker 2.

Wherein, the casing is the outside major structure of audio amplifier, plays the guard action to inside part. The loudspeaker 2 is mounted in a housing, and the loudspeaker 2, also called a "horn", is a transducer that converts electrical signals into acoustic signals. The detailed structure thereof can refer to the prior art, and is not described herein.

The housing comprises a main tube 4 at the front end of the loudspeaker 2, which main tube 4 forms a front chamber 1, which front chamber 1 will give sound waves frequencies at high sound pressure levels. As shown in fig. 1, the main pipe 4 makes the sound pressure level at 500Hz higher, and the peak appears, which affects the subjective listening effect.

The central portion of the main tube 4 has an insertion tube 5 of a different cross-sectional area than the main tube 4 to filter frequencies of high sound pressure levels. Namely, the insertion tube 5 is arranged in the middle of the main tube 4, and the cross-sectional area of the insertion tube 5 is different from that of the main tube 4. The main tube 4 and the insertion tube 5 may be formed integrally as a single piece, or may be formed integrally as a single pieceIn a fixedly connected split structure. Because the section areas of the insertion pipe 5 and the main pipe 4 are different, the insertion pipe is equivalent to the sound load for the main pipe 4, the reflection and the transmission of partial sound waves can be caused, and the transmission coefficient t is obtained according to an acoustic principle formula after the sound passes through the sound load_IComprises the following steps:

in the formula, S₁₂＝S₁/S₂，S₂₁＝S₂/S₁，S₁Is the cross-sectional area of the main tube 4, S₂The cross-sectional area of the cannula 5, D the length of the intermediate cannula 5, k 2 pi/lambda the number of circles.

According to the above formula, the transmission coefficient t of the sound wave through the middle cannula 5_IThe ratio of the cross sections of the main pipe 4 and the insertion pipe 5 is related, and the length of the insertion pipe 5 is related, so that the transmission coefficient of the frequency with high sound pressure level is smaller through setting the ratio of the cross sections of the main pipe 4 and the insertion pipe 5 and setting the length of the insertion pipe 5, the filtering effect on the high sound pressure level is formed, and the high-frequency-level-ratio-based sound wave filter is particularly suitable for eliminating certain frequency components with particularly high sound pressure level in sound waves.

The insertion tube 5 may also be located at the end of the main tube 4, if desired, such as the end of the main tube 4 remote from the speaker 2, i.e. the front end, being connected to the insertion tube 5, or the end of the main tube 4 close to the speaker 2, i.e. the rear end, being connected to the insertion tube 5. As well as filtering in accordance with the above.

By applying the sound box provided by the invention, the front cavity 1 formed by the main pipe 4 can generate sound waves with high sound pressure level, the inserting pipe 5 is arranged at the middle part or the end part of the main pipe 4, the inserting pipe 5 is equivalent to sound load on the main pipe 4 and can cause reflection and transmission of partial sound waves, the sound waves are transmitted through the middle inserting pipe 5, and the inserting pipe 5 plays a role of a silencer, so that the sound box has a filtering function on the frequency with high sound pressure level in the sound waves, the filtering curve of the sound box is smoother, and the subjective listening effect is improved. And the cannula 5 has simple structure and is easy to realize.

In order to correct the low frequency of the sound, the housing specifically comprises a rear shell 7, the rear shell 7 is hermetically connected with the main pipe 4, the loudspeaker 2 is installed at the front end of the rear shell 7, the rear shell 7 is sealed, and the rear shell 7 forms the rear cavity 3. The front cavity 1 and the rear cavity 3 are hermetically separated, specifically, the main pipe 4 is hermetically connected with the rear shell 7, and the loudspeaker 2 is hermetically connected with the front end of the rear shell 7, so that the front end and the rear end of the loudspeaker 2 are separated, and the front cavity 1 and the rear cavity 3 are formed by the main pipe 4 and the rear shell 7. The specific rear cavity can refer to the structure of the rear cavity of the conventional sound box in the prior art, and is not limited in detail here.

In particular, the length of the cannula 5 is an odd multiple of the wavelength corresponding to the frequency of the quarter high sound pressure level. As can be seen from the above formula, the transmission of sound through the middle cannula 5 is not only related to the ratio of the cross-sectional areas of the main tube 4 and the cannula 5, but also related to the length of the cannula 5. When in use

Namely, it is

When the transmission coefficient is the minimum, the transmission capacity of the sound wave is the weakest when the length of the insertion tube 5 is set to be odd times of one fourth of the corresponding wavelength of the high sound pressure level frequency, and the filtering effect is achieved.

Further, the length of the cannula 5 may be set to three quarters of the corresponding wavelength of the frequency of the high sound pressure level. For example, as the sound box shown in fig. 1 has a higher sound pressure level at 500Hz, the length of the insertion tube 5 is 3/4 corresponding to the wavelength of 500Hz, and the filtering effect is more obvious. The simulated acoustic curve obtained after the filtering of the intubation tube 5 is set is shown in fig. 4, the dotted line in the figure shows the acoustic curve after the intubation tube 5 is set, the visible curve is obviously smooth, and the listening experience of a user is obviously improved.

In the above embodiments, the main tube 4 and the insertion tube 5 are concentric circular tubes. The design of the circular tube is adopted, the structure is simple, the appearance is regular, and the interference of edges and corners of the polygonal structure to sound waves is avoided. The cannula 5 is arranged concentrically with the main tube 4 so that the change in volume of the cannula 5 relative to the main tube 4 in all directions is the same.

Specifically, the insertion tube 5 is located in the middle of the main tube 4, and includes a cylindrical surface and end surfaces connected to the upper and lower ends of the cylindrical surface and extending in the radial direction, and the end surfaces are connected to the main tube 4.

In the above embodiments, the insertion tube 5 may be an expanded tube having a cross-sectional area larger than that of the main tube 4, or a contracted tube having a cross-sectional area smaller than that of the main tube 4. The filtering function can be achieved by adopting both the expansion pipe and the contraction pipe, and in order to reduce the resistance to the airflow, the insertion pipe 5 is preferably the expansion pipe, namely the middle part of the main pipe 4 is provided with a part with an enlarged sectional area so as to form a sound attenuation structure.

In addition to the above embodiments, the pipe wall of the main pipe 4 has a plurality of sound-deadening holes 6. The effect of the front cavity 1 is weakened through the arrangement of the silencing holes 6. As shown in fig. 4, the thin solid line shows the acoustic curve after the insertion tube 5 and the muffling hole 6 are provided, and the thick solid line shows the acoustic curve of the enclosure of fig. 1. It can be seen that, by combining the arrangement of the insertion tube 5 and the sound-deadening holes 6, the acoustic curved surface of the sound box is obviously smooth, and after the sound-deadening holes 6 are added, compared with the sound box only provided with the insertion tube 5, the acoustic curve is smoother, so that the listening experience of a user is better.

Specifically, the plurality of muffling holes 6 are uniformly distributed on the pipe wall of the main pipe 4. The silencing holes 6 are uniformly distributed, so that on one hand, the processing is convenient, and meanwhile, the appearance structure of the sound box is more attractive and regular. Meanwhile, the uniformly distributed silencing holes 6 have more consistent silencing effect on all directions of the loudspeaker box, and further ensure the listening effect of the loudspeaker box.

Furthermore, the silencing hole 6 can be opened on the side wall of the main pipe 4, the front end face of the main pipe 4 is provided with a plurality of circles of sound outlet holes which are sequentially sleeved, and sound waves of the loudspeaker 2 are transmitted out through the sound outlet holes. The sound outlet is arranged like this, and the appearance of the sound box is tidy. Specifically, the sound outlet of the sound box can also be correspondingly arranged according to the specific needs of the user.

In conclusion, the sound box is simple in structure, easy to achieve and capable of weakening the formants, the insertion pipe 5 of the sound box is equivalent to a silencer, the effect of the front cavity 1 of the sound box is solved, and the sound of the main pipe 4 is improved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a sound box, characterized in that, including the casing with install in speaker (2) in the casing, the casing is including being located speaker (2) front end is responsible for (4), be responsible for (4) and form front chamber (1), front chamber (1) makes the frequency that the high sound pressure level appears in the sound wave, be responsible for the middle part or the tip of (4) have with be responsible for intubate (5) that the sectional area is different of (4) to the frequency filtering of high sound pressure level.

2. An acoustic enclosure according to claim 1, characterized in that the length of the insertion tube (5) is an odd multiple of the frequency-corresponding wavelength of a quarter of the high sound pressure level.

3. An acoustic enclosure according to claim 2, characterized in that the length of the insertion tube (5) is three quarters of the corresponding wavelength of the frequency of the high sound pressure level.

4. An acoustic enclosure according to claim 1, characterized in that the main tube (4) and the insertion tube (5) are concentric circular tubes.

5. An acoustic enclosure according to claim 4, characterized in that the insert tube (5) is located in the middle of the main tube (4) and comprises a cylindrical surface and end surfaces connected to the upper and lower ends of the cylindrical surface and extending in a radial direction, the end surfaces being connected to the main tube (4).

6. An acoustic enclosure according to claim 1, characterised in that the insertion tube (5) is an expansion tube with a cross-sectional area larger than the main tube (4).

7. An acoustic enclosure according to claim 1, characterised in that the insertion tube (5) is a shrink tube having a cross-sectional area smaller than the main tube (4).

8. An acoustic enclosure according to any one of claims 1 to 7, characterized in that the main duct (4) has a plurality of muffling holes (6) in its wall.

9. An acoustic enclosure according to claim 8, characterized in that a plurality of the muffling apertures (6) are evenly distributed over the wall of the main pipe (4).