Novel sound box design method and active volume compensation sound box

Abstract

When a conventional sound box is designed, a large box body is often needed to ensure the low-frequency quality. The invention provides a novel sound box design method and an active volume compensation sound box. The novel sound box design method mainly comprises the steps of parameter selection of volume compensation and power distribution and design of a calculation formula. The active volume sound box comprises a box body, a main loudspeaker and at least one volume compensation loudspeaker. The internal space of the box body is divided into a closed first working area and at least one closed second working area. According to the invention, through synchronous vibration of the main loudspeaker and the volume compensation loudspeaker, the space in the second working area is positioned in the first working area, and the air volume change in the first working area is partially and even completely compensated, so that the low-frequency characteristic of the active volume compensation loudspeaker is optimized. In addition, the additionally arranged digital signal processor is used for improving sensitivity response in a frequency domain, and comprehensive and excellent tone quality and the characteristics of a small sound box body are considered.

Description

Technical Field

[0001] The invention belongs to the field of audio equipment and relates to a novel sound box design method and an active volume compensation sound box designed by using the method. Background Art

[0002] Speakers are devices or systems commonly used to play sounds. There are many types of speakers, and each has corresponding advantages and disadvantages.

[0003] Common open-type, baffle-type, and closed-type speakers use baffles to block the front and rear anti-phase low-frequency sound waves from meeting each other, so they are designed to be very large. In addition, the first two types of speakers cannot completely block sound waves, so the low-frequency distortion is large.

[0004] The inverted, acoustic impedance, and labyrinth types are based on closed speakers and have an inverted tube structure, so that the low-frequency sound waves behind the speaker are transmitted to the front through the inverted tube with a delay, and the phase is the same as the front sound waves, which can enhance the low-frequency effect after superposition; the first three types of speakers can reduce the volume of the box relatively because the rear sound waves do not need to be enclosed in the box. However, this type of speaker has high requirements for the design length of the inverted tube and poor transient characteristics.

[0005] The speakers of coupled speakers are installed inside, which has the characteristics of being sealed and inverted. When emitting low-frequency sound waves, the amount of air pushed by the speakers increases, which broadens the low-frequency playback range, so the low-frequency distortion is reduced and the power handling is increased, but it cannot play mid- and high-frequency sounds.

[0006] Passive radiation speakers replace the bass reflex tube of the bass reflex speaker with a passive radiation basin, which can eliminate the wind noise and high-frequency sound of the bass reflex tube. It is suitable for small-caliber speakers with very small cabinets, but the low-frequency distortion is very high.

[0007] Therefore, traditional speakers often find it difficult to balance overall excellent sound quality and speaker size. Summary of the invention

[0008] The present invention aims to solve the problem in the prior art that it is difficult to balance low-frequency quality and cabinet volume in a sound box, and provides a novel sound box design method and an active volume compensation sound box designed using the method.

[0009] The technical solution adopted by the present invention is:

[0010] An active volume compensation speaker, comprising:

[0011] Closed box;

[0012] A main speaker, the main speaker is exposed and arranged on the surface of the box;

[0013] At least one volume compensation speaker, wherein the volume compensation speaker is hidden in the box;

[0014] The inner wall of the box, the main speaker and the volume compensation speaker together form an independent first working area; the remaining area of ​​the box except the first working area is surrounded by the inner wall of the box and the volume compensation speaker to form at least one independent second working area space;

[0015] When the main speaker is working and the effective volume of the first working area increases or decreases, the volume compensation speaker working synchronously causes the effective volume of the second working area to increase or decrease synchronously and by the same amount.

[0016] Furthermore, when the volume compensation speaker is provided at one, it is provided above, below or at the rear of the main speaker, and forms a second working area with the inner wall of the box.

[0017] Furthermore, the vibration direction of the diaphragm of the main speaker when working and the vibration direction of the diaphragm of the volume compensation speaker when working are coincident, or parallel, or perpendicular, or at any spatial angle, as long as a second working area can be formed.

[0018] Furthermore, when the number of the volume compensation loudspeakers is greater than one, the plurality of volume compensation loudspeakers are simultaneously located above, below or behind the main loudspeaker, and form at least one second working area with the inner wall of the box;

[0019] Alternatively, the plurality of volume compensation speakers are respectively located above, below or behind the main speaker, and form at least two second working areas with the inner wall of the box.

[0020] Furthermore, when two volume compensation speakers are provided, the two volume compensation speakers are simultaneously located above, below or behind the main speaker, and form one or two second working areas with the inner wall of the box;

[0021] Alternatively, the two volume compensation speakers are respectively located above or below the main speaker, and form two second working areas with the inner wall of the box.

[0022] Further, when the two volume compensation speakers and the inner wall of the box form two second working areas, the two volume compensation speakers are arranged opposite to each other.

[0023] Furthermore, the vibration direction of the diaphragm of the main speaker when in operation is perpendicular to or forms any spatial angle with the vibration direction of the diaphragm of the volume compensation speaker when in operation, as long as the second working area can be formed.

[0024] Furthermore, the active volume compensation speaker also includes a digital signal processor; the digital signal processor is used to improve the sensitivity response in the frequency domain, so as to achieve synchronization of the sensitivity of the main speaker and the volume compensation speaker at different frequencies when they are working.

[0025] Based on the same inventive concept, the present application also discloses a novel speaker design method for configuring the parameters of the active volume compensation speaker, and the method comprises the following steps:

[0026] Step S1, select the models of the main speaker and the volume compensation speaker, and obtain the effective diaphragm area of ​​the main speaker and maximum linear displacement , and the effective diaphragm area of ​​the volume compensation loudspeaker and maximum linear displacement , the parameters related to the main speaker and the volume compensation speaker meet the following conditions:

[0027] ,

[0028] in: For the an effective diaphragm area of ​​the volume compensation loudspeaker;

[0029] For the a maximum linear displacement of the volume compensation loudspeaker;

[0030] The number of volume compensation loudspeakers;

[0031] ;

[0032] Step S2, distributing power to the main speaker and the volume compensation speaker to satisfy:

[0033] ,

[0034] in: The main speaker and the The relative sensitivity of the volume compensation loudspeaker is determined by measuring the relative sensitivity of the main loudspeaker and the volume compensation loudspeaker under the same frequency working conditions. The loudness of the volume compensation loudspeaker is obtained by calculating the quotient of the loudness of the two loudspeakers; wherein the frequency response curve of the main loudspeaker is measured under an infinite baffle; The frequency compensation curve of the volume compensation loudspeaker is measured in a finite volume box;

[0035] The allocated power for the main speaker;

[0036] For the The relative calculated distribution power of the volume compensation loudspeaker is used to determine the actual distribution power of the main loudspeaker. Then, the relative calculated allocated power of each volume compensation loudspeaker is determined. ;

[0037] Step S3: Perform linear interpolation calculation to obtain the actual distributed power of each volume compensation speaker. , specifically using the following formula:

[0038] .

[0039] Furthermore, when there are two or more volume compensation loudspeakers, the effective diaphragm area of ​​each volume compensation loudspeaker is , Maximum linear displacement The actual distributed power may be different, but the actual distributed power of each volume compensation speaker needs to be calculated separately.

[0040] The beneficial effects of the present invention are:

[0041] By setting up a volume compensation speaker, the volume of the first working area on the back of the main speaker can be kept relatively stable when it vibrates, reducing the reaction of air compression on the diaphragm, thereby enhancing the sound quality of the main speaker in the low frequency band. At the same time, the first working area can be regarded as a baffle-type speaker with infinite baffles, and there is no need to consider the volume of the first working area in the design, which overcomes the disadvantage of large volume of the speaker box with good bass, and has a great improvement in comprehensive aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is a schematic diagram of the structure of an active volume compensation speaker.

[0044] Figure 2 This is a side perspective view of Example 1.

[0045] Figure 3 This is a front perspective view of Example 1.

[0046] Figure 4 This is a front perspective view of Example 2.

[0047] Figure 5 This is a front perspective view of Example 3.

[0048] Figure 6 This is a side perspective view of Example 4.

[0049] Figure 7 This is a first type side perspective view of Example 5.

[0050] Figure 8 This is a second type of side perspective view of Example 5.

[0051] Fig. 9 This is a front perspective view of Example 6.

[0052] Fig.10 This is a side perspective view of Example 7.

[0053] Fig.11 This is a front perspective view of Example 8.

[0054] Fig.12 This is the frequency response curve of a 6.5-inch main speaker.

[0055] Fig.13 This is the frequency compensation curve of a 4.5-inch volume compensation speaker.

[0056] Fig.14 This is the measured frequency response curve of Example 1.

[0057] Fig.15 This is the measured frequency response curve of Example 3.

[0058] in Figure 2-Figure 11 Power supplies, crossovers, DSPs, and straps are not included to simplify perspective lines.

[0059] Among them: 1-box; 11-installation plate; 12-first working area; 13-second working area; 2-main speaker; 21-high frequency speaker; 22-mid-low frequency speaker; 3-volume compensation speaker; 4-power supply; 5-crossover; 6-power amplifier; 7-digital signal processor; 8-sound insulation cotton; 9-lifting strap. DETAILED DESCRIPTION

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0061] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0062] The present invention provides an active volume compensation speaker, which is described in detail below with reference to the accompanying drawings.

[0063] Reference Figures 1 to 11 , which comprises: a box body 1, wherein at least one mounting plate 11 is arranged inside the box body 1, wherein the mounting plate 11 divides the box body 1 into a closed first working area 12 and at least one closed second working area 13, and the mounting plate 11 is provided with mounting holes for installing other components. Each mounting plate 11 can only divide the box body 1 into a corresponding second working area 13, that is, the number of the mounting plates 11 is equal to the number of the second working areas 13.

[0064] The main speaker 2 is arranged on the surface of the box 1 , and the back of the main speaker 2 is placed in the first working area 12 . The main speaker 2 includes a high-frequency speaker 21 and a mid-low-frequency speaker 22 .

[0065] The volume compensation speaker 3 is arranged on the mounting plate 11 and is completely built into the box 1. One of the front or back sides of the volume compensation speaker 3 faces the first working area 12, and the other side faces the second working area 13. The volume compensation speaker 3 can provide volume compensation space for the first working area 12.

[0066] The box body 1 of the present invention is also provided with a power supply 4 to provide power for other components; a frequency divider 5 to transmit audio of different frequencies to different speaker units; a digital signal processor 7 to improve the sensitivity response in the frequency domain, so as to achieve synchronization of the sensitivity of the main speaker 2 and the volume compensation speaker 3 at different frequencies when they are working, thereby achieving compression, noise reduction, equalization, reverberation and other effects of the audio signal, and improving the audio quality; sound insulation cotton 8 to reduce audio reflections in the box body 1 and reduce box sound harmonics.

[0067] The box body of the present invention is provided with a lifting strap 9 outside for carrying the speaker.

[0068] Example 1

[0069] Reference Figure 2 and Figure 3 In Example 1, two mounting plates 11 are arranged in the box body 1, and the two mounting plates 11 divide the box body 1 into one first working area 12 and two second working areas 13. Two volume compensation speakers 3 are arranged in the active volume compensation sound box, which are symmetrically installed on the upper and lower sides of the box body 1, and the openings of the volume compensation speakers 3 are opposite to each other, that is, the openings of the volume compensation speakers 3 are facing the first working area 12.

[0070] When the main speaker 2 vibrates and produces a displacement toward the inside of the first working area 12, the two volume compensation speakers 3 are driven simultaneously and synchronously produce a vertical displacement away from each other, thereby making an equal amount of space to be compensated in the first working area 12, so that the relative volume in the first working area 12 remains unchanged.

[0071] When the main speaker 2 vibrates and generates displacement away from the interior of the first working area 12, the two volume compensation speakers 3 synchronously generate displacement toward each other in the vertical direction, so that the relative volume in the first working area 12 remains unchanged.

[0072] The synchronous working mode of the volume compensation speakers 3 ensures that the air in the first working area 12 will not affect the main speaker 2, thereby ensuring the low-frequency sound quality of the speaker. And when the volume compensation speakers 3 are symmetrically installed, their relative vibrations are in an inverse relationship, and the vibration effects of each volume compensation speaker 3 on the box 1 will cancel each other out.

[0073] During the sound generation process, the second working area 13 will produce the problem of compressed air in a conventional speaker, so an amplifier 6 is added to the speaker to drive the volume compensation speaker 3. At the same time, due to the small size of the volume compensation speaker 3, its sound volume in the low frequency band is insufficient, which will not affect the overall audio effect of the volume compensation speaker, and the additional digital signal processor 7 and the sound insulation cotton 8 can further optimize the low-frequency sound quality of the volume compensation speaker.

[0074] Example 2

[0075] Reference Figure 4 In this embodiment, two mounting plates 11 are arranged in the box, and two volume compensation speakers 3 are symmetrically installed on both sides of the box 1. When the main speaker 2 vibrates and displaces toward the inside of the first working area 12, the two volume compensation speakers 3 simultaneously displace away from each other in the horizontal direction, so that the relative volume in the first working area 12 remains unchanged.

[0076] When the main speaker 2 vibrates and generates displacement away from the interior of the first working area 12, the two volume compensation speakers 3 simultaneously generate displacement toward each other in the horizontal direction, so that the relative volume in the first working area 12 remains unchanged.

[0077] Compared with Example 1, the height dimension of this embodiment is reduced, but the width dimension is increased.

[0078] Example 3

[0079] Reference Figure 5 When the volume of the box 1 is limited and the volume compensation speaker 3 is small in size, the volume compensation speaker 3 can be installed on a mounting plate 11 on the same side of the box 1. Figure 5 The figure shows a situation where two volume compensation speakers 3 are installed on the lower side of the box 1. In the front perspective view, the two volume compensation speakers 3 overlap each other.

[0080] When the main speaker 2 is in operation and generates displacement toward the inside of the first working area 12 , the two volume compensation speakers 3 both generate vertical downward displacement, thereby ensuring that the inner volume of the first working area 12 is relatively stable.

[0081] When the main speaker 2 is in operation and generates displacement away from the first working area 12 , the two volume compensation speakers 3 both generate vertical upward displacement, thereby ensuring that the inner volume of the first working area 12 is relatively stable.

[0082] However, since the two volume compensation speakers 3 vibrate on one side in the box 1 and the two volume compensation speakers 3 vibrate in the same direction when working, the box 1 as a whole will generate slight vibration in the vertical direction.

[0083] Example 4

[0084] Reference Figure 6 A mounting plate 11 is installed on the upper side of the box body 1, and a volume compensation speaker 3 is installed on the mounting plate 11. The working conditions of installing a single volume compensation speaker 3 and installing multiple volume compensation speakers 3 are the same.

[0085] In this embodiment, the overall center of gravity of the speaker is lowered, making it more stable during operation.

[0086] Example 5

[0087] Reference Figure 7 A mounting plate 11 is provided on the rear side of the box body 1, and three volume compensation speakers 3 are installed on the mounting plate 11 and are distributed up and down with respect to each other. When the main speaker 2 is working and produces a displacement toward the inside of the first working area 12, the three volume compensation speakers 3 all produce a horizontal backward displacement, thereby ensuring that the volume inside the first working area 12 is relatively stable.

[0088] When the main speaker 2 is in operation and generates displacement away from the first working area 12 , the three volume compensation speakers 3 all generate horizontal forward displacement, thereby ensuring that the inner volume of the first working area 12 is relatively stable.

[0089] or refer to Figure 8 , the position of the volume compensation loudspeaker 3 installed on the rear side of the box body 1 is changed, and all are arranged on the same horizontal line. In the side perspective view, the three volume compensation loudspeakers 3 overlap each other, but the relevant working conditions are the same.

[0090] Compared with other embodiments, the size of Embodiment 5 in the height or width direction is reduced, but the size in the thickness direction is increased.

[0091] Example 6

[0092] Reference Fig. 9 , the opening directions of the volume compensation speaker 3 can be set opposite to each other, that is, the opening of the volume compensation speaker 3 is toward the second working area 13. At this time, the vibration directions of the main speaker 2 and the volume compensation speaker 3 are set opposite to each other, and the volume compensation work can be performed normally.

[0093] In this embodiment, the connection ports of the main speaker 2 and the volume compensation speaker 3 are both located in the first working area 12, which makes the connection more convenient.

[0094] Example 7

[0095] Reference Fig.10 A mounting plate 11 is tiltedly arranged in the box body 1, and the two volume compensation speakers 3 mounted thereon are also tilted relative to the main speaker 2. Its working principle is similar to that of Example 5.

[0096] In this embodiment, the vibration effect of the volume compensation speaker 3 on the box 1 can be decomposed into two directions, horizontal and vertical. Compared with the case where the volume compensation speaker 3 is only installed vertically or horizontally, the vibration effect in a single direction can be reduced.

[0097] Example 8

[0098] Reference Fig.12 Two mounting plates 11 are mounted on the upper and lower parts of the box 1. Two volume compensation speakers 3 are mounted on the upper mounting plate 11, and one volume compensation speaker 3 is mounted on the lower mounting plate 11. The working principle of this embodiment is similar to that of the first embodiment.

[0099] The invention also provides a novel sound box design method.

[0100] During the operation of a conventional speaker, the speaker itself has a specific resonant frequency. After the speaker is installed, the vibration of the speaker diaphragm will squeeze the air in the speaker box. Due to the limited space in the box, the normal vibration of the diaphragm will be reversed, making the voice coil movement shorter, the dive less, the transient faster, and affecting the low-frequency sound quality. At this time, the speaker and the speaker itself jointly form a new system resonant frequency ,and In theory, an infinitely large cabinet space is required to ensure that the air in the cabinet will not be squeezed and react on the speaker diaphragm, thus minimizing the , and maintain the low-frequency sound quality of the speaker to the greatest extent.

[0101] The working principle of the volume compensation speaker in the present invention is: through the coordinated work of the volume compensation speaker 3, the volume of the first working area 12 remains unchanged during operation, avoiding the compression of the air in the first working area 12, thereby avoiding the air from reacting on the diaphragm of the main speaker 2, and optimizing the sound quality of the volume compensation speaker.

[0102] The novel speaker design method involves a volume compensation unit, and at the same time, the internal structure of the box 1 changes, and the internal space of the box 1 is divided into a first working area 12 and at least one second working area 13. The design method is as follows:

[0103] 1. Select the model of main speaker 2 and obtain the maximum linear displacement of main speaker 2 and effective diaphragm area The size and model of the volume compensation speaker 3 are selected according to the expected box size, and the maximum linear displacement of each volume compensation speaker 3 is obtained. and effective diaphragm area .

[0104] The principle of the volume compensation speaker is: through the coordinated work of the volume compensation speaker 3, the volume of the first working area 12 remains unchanged, and the compression vibration of the air in the first working area 12 is weakened. Therefore, in order to ensure that the volume of the air behind the main speaker 2 remains unchanged, it is necessary to make the main speaker 2 and The relevant parameters of the volume compensation speaker 3 satisfy Formula 1. At the same time, the volume compensation speaker 3 is small in size, so the sound volume in the low frequency band is insufficient, and the low-frequency audio emitted is blocked in the closed working area at the front and back, which does not affect the overall effect of the speaker.

[0105] Formula 1

[0106] in: For the an effective diaphragm area of ​​the volume compensation loudspeaker (3);

[0107] For the a maximum linear displacement of the volume compensation loudspeaker (3);

[0108] is the number of the volume compensation loudspeakers (3);

[0109] .

[0110] If formula 1 is satisfied, the volume of the main speaker 2 can be fully compensated, and the resonant frequency of the main speaker 12 itself will not be affected before and after the speaker is installed. , the main speaker 2 is equivalent to working in an infinite space, and the low-frequency performance is not affected by the volume of the first working area 12.

[0111] like , that is, the enclosed space at the back of the main speaker 2 cannot be fully compensated. After the main speaker 2 vibrates, the air behind it will produce a reaction force on the main speaker. The low-frequency performance of the main speaker 2 is affected by the volume size of the first working area 12.

[0112] like That is, the enclosed space at the back of the main speaker 2 can obtain excessive compensation, and the low-frequency performance of the main speaker 2 is not affected by the volume size of the first working area 12, but can be driven by the volume compensation speaker 3. At this time, the main speaker 2 obtains enhanced low-frequency performance, but the low-frequency distortion increases, and the sound quality is slightly reduced, but it is within an acceptable distortion range.

[0113] In view of the above situation, the relevant requirements can be met by adjusting the number of the volume compensation speakers 3, or adjusting the driving power of the main speaker 2 and the volume compensation speakers 3. In the case where the first working area 12 cannot be fully compensated, the volume of the first working area 12 can be appropriately increased to obtain a lower system resonance frequency. , so that the sound quality is improved.

[0114] 2. Adjust the power distribution according to the sensitivity of each speaker.

[0115] Each speaker of the active volume compensation speaker needs to be driven separately, and appropriate power is allocated according to the sensitivity of each speaker, so as to adjust the maximum linear displacement of the main speaker 2 and the maximum linear displacement of the volume compensation loudspeaker 3 , to satisfy Formula 1 and obtain good sound performance.

[0116] First, the frequency response curve of the main speaker 2 under the infinite baffle is measured; and the frequency compensation curve of the volume compensation speaker 3 under the finite volume box is measured. The sound intensity of the main speaker 2 and the volume compensation speaker 3 under the same frequency working state is obtained to represent the sensitivity, and the relative sensitivity of the main speaker 2 and each of the volume compensation speakers 3 is calculated. Assume that the distribution power of the main speaker 2 is , the relative calculated distribution power of each volume compensation loudspeaker 3 is , the relative distribution power of the main speaker 2 and each of the volume compensation speakers 3 can be obtained according to Formula 2:

[0117] Formula 2

[0118] in: The main speaker 2 and the The volume compensates for the relative sensitivity of the loudspeaker 3 .

[0119] Determine the actual allocated power of the main speaker 2 After that, the relative calculated distribution power of each volume compensation loudspeaker 3 can be determined. The actual distributed power of each volume compensation loudspeaker 3 is obtained by linear interpolation calculation using Formula 3: :

[0120] Formula 3

[0121] It is necessary to compare the maximum operating power of the selected model. If it exceeds the power upper limit of a single volume compensation speaker 3, it can be adjusted by increasing the number of the volume compensation speakers 3. At the same time, the adjusted related parameters must meet the requirements of Formula 1.

[0122] 3. If the parameters of the multiple volume compensation loudspeakers 3 used are exactly the same, the formula 1 can be simplified to the formula 4 as shown below:

[0123] Formula 4

[0124] 4. When distributing power, the power of the multiple volume compensation loudspeakers 3 is also exactly the same, and the formula 2 is simplified as shown in formula 5:

[0125] Formula 5

[0126] in: The power is allocated for the calculation of the individual volume compensation loudspeakers 3 .

[0127] Determine the actual power of the main speaker 2 After that, the relative calculated distribution power of each volume compensation loudspeaker 3 can be determined. , then the actual distributed power of the single volume compensation loudspeaker 2 The calculation formula is shown in Formula 5:

[0128] Formula 5

[0129] 5. With the assistance of the volume compensation speaker 3, no matter what the actual size of the volume of the first working area 12 is, in actual operation, the first working area 12 is equivalent to an infinitely large open space of the baffle. Therefore, the present invention does not need to consider the design of the volume of the first working area 12. The volume of the first working area 12 only needs to meet the requirements for the placement of other internal structures.

[0130] The second working area 13 is equivalent to a closed box with a finite volume. In step 3, the test volume in the closed box with a finite volume is the design volume of the second working area 13 .

[0131] At this point, a new speaker design method has been described.

[0132] Taking the installation structure described in Example 1 as an example, when the test signal is 2.83 volts and the frequency response curve is normalized to a microphone test distance of 1 meter, the frequency response curve of a 6.5-inch main speaker 2 on an infinite baffle is measured, such as Fig.12 As shown by the dotted line in . And the frequency compensation curve of a 4.5-inch volume compensation speaker 3 in a 2.5 cubic decimeter closed box, as shown in Fig.13 As shown by the solid line in .

[0133] For the 40Hz working point, the sensitivity of the main speaker 2 is 79dB, and the sensitivity of the volume compensation speaker 3 is 65dB. After relevant calculations, the distributed power of the main speaker 3 is P1, and the distributed power of each volume compensation speaker 3 is P2.

[0134] After the speaker is installed in the sound box, the actual volume of the first working area 12 is V1, and the volume of the second working area on the upper and lower sides is 2.5dm 3 The measured frequency response curve of the active volume compensation speaker is as follows: Fig.14 As shown in the figure, compared with the frequency response curve of the main speaker 2 measured on the infinite baffle, its curve in the low frequency band of 40Hz-160Hz is smoother and has no obvious sudden change trend, indicating that the active volume compensation speaker has a good performance effect in low frequency performance. And the measured frequency response curves between 40Hz and 20kHz are smooth as a whole, with little fluctuation, indicating that the active volume compensation speaker described in Example 1 can achieve good performance in the full frequency band.

[0135] Under the same test conditions, the installation structure described in Example 3 is used as an example for installation. The actual volume of the first working area 12 is V2, and the volume of the second working area at the lower side is 2.5 dm 3 The measured frequency response curve of the active volume compensation speaker is as follows: Fig.15 As shown, compared with the frequency response curve of the main speaker 2 measured on an infinite baffle, the curve changes in the low frequency bands are not much different. This shows that the volume compensation speaker 3 installed according to the structure shown in Example 3 can achieve a good volume compensation effect, making the main speaker 2 approximately equivalent to working on an infinite baffle, and can effectively improve the sound quality of the low frequency band of the speaker.

[0136] The present invention provides a novel speaker design method, which realizes the relative stability of the internal volume of the first working area 12 by adding a volume compensation unit, and designs a related power distribution method for the main speaker 2 and the volume compensation speaker 3. The volume compensation principle of the novel speaker design method in the present invention can also be applied to various speaker fields, such as: whole-house multi-sound system, Bluetooth portable speakers, electro-acoustic musical instrument speakers, etc.

[0137] At the same time, the present invention also provides an active volume compensation speaker, which solves the problem that conventional speakers are difficult to balance low-frequency sound quality and small speaker volume, and is easy to carry.

Claims

1. An active volume compensation speaker, characterized in that: include: A closed box (1); A main speaker (2), the main speaker (2) being exposed and arranged on the surface of the box (1); At least one volume compensation loudspeaker (3), the volume compensation loudspeaker (3) being concealed and arranged in the box (1); The inner wall of the box (1), the main speaker (2) and the volume compensation speaker (3) together form an independent first working area (12); the remaining area of ​​the box (1) except the first working area (12) is surrounded by the inner wall of the box (1) and the volume compensation speaker (3) to form at least one independent second working area (13) space; When the main speaker (2) is in operation and causes the effective volume of the first working area (12) to increase or decrease, the volume compensation speaker (3) working synchronously causes the effective volume of the second working area (13) to increase or decrease synchronously and by the same amount.

2. The active volume compensation speaker according to claim 1, characterized in that: When there is one volume compensation speaker (3), it is arranged above, below or at the rear of the main speaker (2) and forms a second working area (13) with the inner wall of the box (1).

3. The active volume compensation speaker according to claim 2, characterized in that: The vibration direction of the diaphragm of the main loudspeaker (2) when in operation coincides with, or is parallel to, or perpendicular to, the vibration direction of the diaphragm of the volume compensation loudspeaker (3) when in operation, or forms any spatial angle, as long as a second working area can be formed.

4. The active volume compensation speaker according to claim 1, characterized in that: When the number of the volume compensation loudspeakers (3) is greater than one, the plurality of volume compensation loudspeakers (3) are simultaneously located above, below or behind the main loudspeaker (2), and form at least one second working area (13) with the inner wall of the box (1); Alternatively, the plurality of volume compensation loudspeakers (3) are respectively located above, below or behind the main loudspeaker (2), and form at least two second working areas (13) with the inner wall of the box (1).

5. The active volume compensation speaker according to claim 4, characterized in that: When two volume compensation loudspeakers (3) are provided, the two volume compensation loudspeakers (3) are simultaneously located above, below or behind the main loudspeaker (2), and form one or two second working areas (13) with the inner wall of the box (1); Alternatively, the two volume compensation loudspeakers (3) are respectively located above or below the main loudspeaker (2), and form two second working areas (13) together with the inner wall of the box (1).

6. The active volume compensation speaker according to claim 4, characterized in that: When the two volume compensation loudspeakers (3) and the inner wall of the box body (1) form two second working areas (13), the two volume compensation loudspeakers (3) are arranged opposite to each other.

7. The active volume compensation speaker according to claim 5, characterized in that: The vibration direction of the diaphragm of the main loudspeaker (2) when in operation is perpendicular to the vibration direction of the diaphragm of the volume compensation loudspeaker (3) when in operation, and a second working area is formed.

8. The active volume compensation speaker according to any one of claims 1 to 7, characterized in that: The active volume compensation speaker also includes a digital signal processor (7); the digital signal processor (7) is used to improve the sensitivity response in the frequency domain, so as to achieve synchronization of the sensitivity of the main speaker (2) and the volume compensation speaker (3) at different frequencies when they are working.

9. A novel speaker design method for configuring the parameters of an active volume compensation speaker as claimed in any one of claims 1 to 8, characterized in that: The design method comprises the following steps: Step S1, selecting the models of the main speaker (2) and the volume compensation speaker (3), and obtaining the effective diaphragm area of ​​the main speaker (2) and maximum linear displacement , and the effective diaphragm area of ​​the volume compensation loudspeaker (3) and maximum linear displacement , the relevant parameters of the main speaker (2) and the volume compensation speaker (3) satisfy the following conditions: ， in: For the an effective diaphragm area of ​​the volume compensation loudspeaker (3); For the a maximum linear displacement of the volume compensation loudspeaker (3); is the number of the volume compensation loudspeakers (3); ； Step S2, distributing power to the main speaker (2) and the volume compensation speaker (3) to satisfy: ， in: The main speaker (2) and the The relative sensitivity of the volume compensation loudspeaker (3) is determined by measuring the relative sensitivity of the main loudspeaker (2) and the volume compensation loudspeaker (3) under the same frequency working conditions. The loudness of the volume compensation loudspeaker (3) is measured, and the quotient of the loudness of the two is calculated to obtain the frequency response curve of the main loudspeaker (2) being measured under an infinite baffle; The frequency compensation curve of the volume compensation loudspeaker (3) is measured in a finite volume box; The allocated power for the main speaker (2); For the The relative calculated distribution power of the volume compensation loudspeaker (3) is used to determine the actual distribution power of the main loudspeaker (2). Then, the relative calculated allocated power of each volume compensation loudspeaker (3) is determined. ; Step S3, performing linear interpolation calculation to obtain the actual distributed power of each volume compensation loudspeaker (3) , specifically using the following formula: 。 10. The novel sound box design method according to claim 9, characterized in that: When there are two or more volume compensation loudspeakers (3), the effective diaphragm area of ​​each volume compensation loudspeaker (3) is , Maximum linear displacement The actual distributed power may be different, but the actual distributed power of each volume compensation loudspeaker (3) needs to be calculated separately.

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