A method and system for designing a low frequency acoustic sound cavity

Abstract

The application relates to the field of acoustics, in particular to a design method and system of a low-frequency acoustic sound cavity. The scheme comprises the following steps: setting a low-frequency sound cavity basic structure, the basic structure comprising a bottom plate, a middle buckle, a sound blocking plate and a tuning cover; setting a buzzer piece between the bottom plate and the middle buckle, adopting a 35mm specification of a he-activated buzzer piece; setting the internal size of the buzzer cavity according to preset low-frequency frequency band requirements; setting a sound wave transmission channel composed of the bottom plate and the sound blocking plate according to current low-frequency frequency band requirements; setting multiple audio frequency point groups, so that the harmonics of each audio in the frequency point group all include a range of 3khz+ / -500hz; and designing the tuning cover so that a single resonance peak is converted into two resonance peaks. Through the use of acoustic detection, human acoustic sensing mechanism and buzzer piece and support setting, in combination with the oscillation sound production characteristics of the buzzer piece and buzzer cavity setting, the scheme realizes efficient and low-cost acoustic drive design.

Description

Technical Field

[0001] This invention relates to the field of acoustics, and more specifically, to a design method and system for a low-frequency acoustic cavity. Background Technology

[0002] Traditional fire alarm devices typically operate in the high-frequency range of 2kHz to 4kHz, as significant energy conversion is lost in frequencies below 600Hz. However, depending on the specific region and location, the required acoustic alarm frequency band for fire alarm devices varies, with some areas requiring a band between 400 and 600Hz.

[0003] Prior to this invention, existing buzzer chips could not achieve such low resonant frequencies, requiring acoustic cavity design that sacrificed sound efficiency to reach the corresponding frequency range. Therefore, it was necessary to solve the problem of low conversion efficiency of traditional low-frequency acoustic cavities and achieve efficient conversion in the low-frequency range. Summary of the Invention

[0004] In view of the above problems, this invention proposes a design method and system for a low-frequency acoustic cavity. By using acoustic detection, human acoustic sensing mechanism and buzzer plate and its support method, combined with the oscillation sound generation characteristics of the buzzer plate and the setting of the buzzer cavity, a high-efficiency and low-cost acoustic drive design is achieved.

[0005] According to a first aspect of the present invention, a method for designing a low-frequency acoustic cavity is provided.

[0006] In one or more embodiments, preferably, the method for designing a low-frequency acoustic cavity includes:

[0007] The basic structure of the low-frequency acoustic cavity is set, which includes a base plate, a middle buckle, a sound baffle plate, and a tuning cover;

[0008] A buzzer is installed between the base plate and the middle buckle, using a 35mm externally excited buzzer;

[0009] The internal dimensions of the buzzer cavity are set according to the preset low-frequency band requirements;

[0010] According to the current requirements for low-frequency band transmission, a sound wave transmission channel composed of the base plate and the sound baffle is set up.

[0011] Set up multiple frequency groups for audio frequencies, so that the harmonics of each audio frequency in the frequency group include a range of 3kHz±500Hz.

[0012] The design of the tuning shield transforms a single resonant peak into two resonant peaks.

[0013] In one or more embodiments, preferably, the low-frequency acoustic cavity basic structure includes a base plate, a middle clip, a sound baffle, and a tuning cover, specifically including:

[0014] An external excitation signal is provided between the base plate and the middle buckle;

[0015] The sound waves are transmitted to the tuning shield for adjustment through the sound transmission channel formed by the middle buckle and the sound baffle.

[0016] In one or more embodiments, preferably, the step of providing a buzzer between the base plate and the center buckle, using a 35mm externally excited buzzer, specifically includes:

[0017] Obtain a plastic sheet with an outer diameter of 49mm;

[0018] By pressing together a 35mm externally excited buzzer chip with a plastic sheet, the resonant frequency is reduced.

[0019] In one or more embodiments, preferably, setting the internal dimensions of the buzzer cavity according to preset low-frequency band requirements specifically includes:

[0020] Extract the current preset low-frequency band requirements and select the fundamental frequency of an externally excited buzzer.

[0021] Based on the fundamental frequency, the internal dimensions of the buzzer cavity are set using the first calculation formula;

[0022] The first calculation formula is:

[0023]

[0024] Where fcav is the fundamental frequency, i.e. the resonant frequency of the corresponding buzzer cavity, in Hz; d is the diameter of the supporting edge, in cm; c is the speed of sound propagation, in cm / second; a is the radius of the sound emission hole, in cm; R is the wall thickness of the buzzer cavity, in cm; and h is the depth of the resonance cavity, in cm.

[0025] In one or more embodiments, preferably, the step of setting up the sound wave transmission channel composed of the base plate and the sound baffle plate according to the current low-frequency band requirements specifically includes:

[0026] Based on the current requirements for low-frequency transmission, select the corresponding fundamental frequency of the externally excited buzzer chip;

[0027] A sound wave transmission channel composed of the base plate and the sound baffle is provided, and the sound wave transmission channel is designed in a short wave shape.

[0028] This allows the fundamental frequency of the externally excited buzzer to be transmitted in a standing wave state within the sound wave transmission channel, thus determining the corresponding sound wave transmission channel configuration.

[0029] In one or more embodiments, preferably, the setting of multiple audio frequency groups such that the harmonics of each audio in the frequency group include a range of 3kHz ± 500Hz specifically includes:

[0030] By adjusting the structure of the buzzer cavity, a combination of resonant frequencies can be achieved;

[0031] If, during verification, a combination is found where the harmonics of each audio frequency range includes a range of 3kHz ± 500Hz, then the corresponding buzzer cavity design is taken as the final setting.

[0032] In one or more embodiments, preferably, the design of the tuning shield transforms a single resonant peak into two resonant peaks, specifically including:

[0033] Obtain the frequency points of the current required output;

[0034] By setting up a tuning shield, a single resonant peak is transformed into two resonant peaks, and the audio energy of the two fundamental frequencies is superimposed on multiple harmonics, ultimately achieving multiple superpositions of audio around 3kHz.

[0035] According to a second aspect of the present invention, a design system for a low-frequency acoustic cavity is provided.

[0036] In one or more embodiments, preferably, the low-frequency acoustic cavity design system includes:

[0037] The structural setting module is used to set the basic structure of the low-frequency acoustic cavity, which includes a base plate, a middle clip, a sound baffle, and a tuning cover.

[0038] A buzzer setting module is used to set a buzzer between the base plate and the middle buckle, using a 35mm externally excited buzzer;

[0039] The cavity setting module is used to set the internal dimensions of the buzzer cavity according to the preset low-frequency band requirements;

[0040] The transmission channel setting module is used to set the sound wave transmission channel composed of the base plate and the sound baffle plate according to the current low frequency band requirements;

[0041] The frequency setting module is used to set the frequency groups of multiple audio frequencies, so that the harmonics of each audio in the frequency group include a range of 3kHz±500hz.

[0042] The tuning shield setting module is used to design the tuning shield so that a single resonant peak is transformed into two resonant peaks.

[0043] According to a third aspect of the present invention, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the method as described in any one of the first aspects of the present invention.

[0044] According to a fourth aspect of the present invention, an electronic device is provided, including a memory and a processor, wherein the memory is used to store one or more computer program instructions, wherein the one or more computer program instructions are executed by the processor to implement the method described in any one aspect of the present invention.

[0045] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0046] This invention achieves high low-frequency acoustic conversion efficiency with a very small space volume, solving the problems of low efficiency, high cost and large size of traditional low-frequency acoustic drives.

[0047] This invention utilizes the design theories of buzzer cavity, sound wave transmission, and sound wave resonance peak coupling to complete the overall design of a low-frequency acoustic cavity.

[0048] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0049] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a flowchart of a low-frequency acoustic cavity design method according to an embodiment of the present invention.

[0052] Figure 2 This is a flowchart illustrating the design method for a low-frequency acoustic cavity according to an embodiment of the present invention, wherein the basic structure of the low-frequency acoustic cavity includes a base plate, a middle clip, a sound baffle, and a tuning cover.

[0053] Figure 3This is a flowchart illustrating a design method for a low-frequency acoustic cavity according to an embodiment of the present invention, in which a buzzer is placed between the base plate and the middle buckle, using a 35mm externally excited buzzer.

[0054] Figure 4 This is a flowchart illustrating the process of setting the internal dimensions of a buzzer cavity according to preset low-frequency band requirements in a low-frequency acoustic cavity design method according to an embodiment of the present invention.

[0055] Figure 5 This is a flowchart illustrating a method for designing a low-frequency acoustic cavity according to an embodiment of the present invention, which describes the setting of a sound wave transmission channel composed of the base plate and the sound baffle plate based on the current requirements of the low-frequency band.

[0056] Figure 6 This is a flowchart illustrating a design method for a low-frequency acoustic cavity according to an embodiment of the present invention, which sets up multiple frequency point groups for audio frequencies such that the harmonics of each audio frequency in the frequency point group include a range of 3kHz ± 500Hz.

[0057] Figure 7 This is a flowchart illustrating the design of a tuning shield in a low-frequency acoustic cavity design method according to an embodiment of the present invention, which transforms a single resonance peak into two resonance peaks.

[0058] Figure 8 This is a structural diagram of a low-frequency acoustic cavity design system according to an embodiment of the present invention.

[0059] Figure 9 This is a structural diagram of an electronic device according to one embodiment of the present invention.

[0060] Figure 10 This is a weighted curve of the weighted sound pressure level.

[0061] Figure 11 This is a side view of the overall acoustic cavity including the sound baffle and the tuning cover, as an example of the present invention.

[0062] Figure 12 This is a front view of the acoustic cavity in an example of the present invention.

[0063] Figure 13 This is a left view of the acoustic cavity body in an example of the present invention.

[0064] Figure 14 This is a rear view of the acoustic cavity in an example of the present invention.

[0065] Figure 15 This is a cross-sectional view of the acoustic cavity in an example of the present invention.

[0066] Figure 16 This is a cross-sectional view of the acoustic cavity without the tuning cover, as shown in the example of the present invention.

[0067] Figure 17 This is a cross-sectional view of the acoustic cavity without a sound-blocking plate, as described in an example of the present invention.

[0068] Figure 18 This is a side view of the acoustic cavity without the tuning cover, as an example of the present invention.

[0069] Figure 19 This is a side view of the acoustic cavity without a sound baffle, as described in an example of the present invention.

[0070] Figure 20 This is a side view of the acoustic cavity base according to an example of the present invention. Detailed Implementation

[0071] In some of the processes described in the specification, claims, and accompanying drawings of this invention, multiple operations appearing in a specific order are included. However, it should be clearly understood that these operations may not be executed in the order they appear herein, or may be executed in parallel. The operation numbers, such as 101, 102, etc., are merely used to distinguish different operations and do not represent any execution order. Furthermore, these processes may include more or fewer operations, and these operations may be executed sequentially or in parallel. It should be noted that the descriptions such as "first," "second," etc., in this document are used to distinguish different messages, devices, modules, etc., and do not represent a sequential order, nor do they limit "first" and "second" to different types.

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0073] Traditional fire alarm devices typically operate in the high-frequency range of 2kHz to 4kHz, as significant energy conversion is lost in frequencies below 600Hz. However, depending on the specific region and location, the required acoustic alarm frequency band for fire alarm devices varies, with some areas requiring a band between 400 and 600Hz.

[0074] Prior to this invention, existing buzzer chips could not achieve such low resonant frequencies, requiring acoustic cavity design that sacrificed sound efficiency to reach the corresponding frequency range. Therefore, it was necessary to solve the problem of low conversion efficiency of traditional low-frequency acoustic cavities and achieve efficient conversion in the low-frequency range.

[0075] This invention provides a design method and system for a low-frequency acoustic cavity. This solution achieves high-efficiency, low-cost acoustic drive design by using acoustic detection, the human acoustic sensing mechanism, and the configuration of a buzzer and its support, combined with the oscillation characteristics of the buzzer and the configuration of the buzzer cavity.

[0076] According to a first aspect of the present invention, a method for designing a low-frequency acoustic cavity is provided.

[0077] Figure 1 This is a flowchart of a low-frequency acoustic cavity design method according to an embodiment of the present invention.

[0078] In one or more embodiments, preferably, the method for designing a low-frequency acoustic cavity includes:

[0079] S101. Set up a basic structure for a low-frequency acoustic cavity, the basic structure including a base plate, a middle clip, a sound baffle, and a tuning cover;

[0080] S102. A buzzer is installed between the base plate and the middle buckle, using a 35mm externally excited buzzer.

[0081] S103. Set the internal dimensions of the buzzer cavity according to the preset low-frequency band requirements;

[0082] S104. Based on the current requirements for low-frequency band transmission, a sound wave transmission channel composed of the base plate and the sound baffle plate is set up.

[0083] S105. Set multiple audio frequency groups so that the harmonics of each audio in the frequency group include a range of 3kHz±500Hz.

[0084] S106. The design of the tuning cover transforms a single resonant peak into two resonant peaks.

[0085] In this embodiment of the invention, a low-frequency acoustic cavity is provided. By superimposing the fundamental wave and multiple harmonics of the sound wave, the final sound intensity is improved. Simultaneously, based on the human acoustic sensing mechanism, the harmonics near 3kHz are designed as the strongest harmonics. First, by optimizing the low-frequency generation characteristics of the buzzer and designing the internal dimensions of the buzzer cavity, more suitable fundamental wave signals can be generated. Then, according to the sound wave transmission design theory, the sound wave and the sound wave transmission channel are in a standing wave state, thereby efficiently transmitting the sound wave signal. Simultaneously, by shaping the sound wave transmission channel, harmonic energy is effectively transmitted. Finally, using the sound wave resonance peak coupling design theory and a tuning cover, the 3kHz harmonic peak is shaped to meet the requirements of the sound source pair.

[0086] Figure 2This is a flowchart illustrating the design method for a low-frequency acoustic cavity according to an embodiment of the present invention, wherein the basic structure of the low-frequency acoustic cavity includes a base plate, a middle clip, a sound baffle, and a tuning cover.

[0087] like Figure 2 As shown, in one or more embodiments, preferably, the low-frequency acoustic cavity basic structure includes a base plate, a middle clip, a sound baffle, and a tuning cover, specifically including:

[0088] S201. An external excitation signal is provided between the base plate and the middle buckle;

[0089] S202. The sound wave is transmitted to the tuning cover for adjustment through the sound transmission channel formed by the middle buckle and the sound baffle.

[0090] In this embodiment of the invention, the working principle of the basic structure of the low-frequency acoustic cavity is as follows: an external excitation signal excites a buzzer placed between the base plate and the center plate, causing the buzzer to resonate with the acoustic cavity and thus emit sound. The sound is transmitted to the tuning shield through the sound wave transmission channel formed by the center plate and the sound baffle. The tuning shield adjusts the harmonic peaks of the sound wave, ultimately outputting the sound wave signal to the outside.

[0091] Figure 3 This is a flowchart illustrating a design method for a low-frequency acoustic cavity according to an embodiment of the present invention, in which a buzzer is placed between the base plate and the middle buckle, using a 35mm externally excited buzzer.

[0092] like Figure 3 As shown, in one or more embodiments, preferably, the step of providing a buzzer between the base plate and the center buckle, using a 35mm externally excited buzzer, specifically includes:

[0093] S301. Obtain a plastic sheet with an outer diameter of 49mm;

[0094] S302. A 35mm externally excited buzzer chip is superimposed with a plastic sheet by pressing them together to reduce the resonant frequency.

[0095] In the embodiments of the present invention, it should be noted that the present invention can also use other sizes or self-excited buzzer pieces or glued plastic pieces to change the resonant frequency and meet different sound frequency requirements.

[0096] In this embodiment of the invention, when setting the buzzer, it is considered that the frequency of common 35mm externally excited buzzers is generally above 2.4kHz, with many models in the 2.8-3kHz range. The design of the sound cavity should be coordinated with the buzzer. Since the resonant point of a standalone buzzer is relatively high, a pressed plastic sheet can be used to improve its resonant frequency, achieve the optimal sound intensity, and further reduce power consumption.

[0097] Figure 4 This is a flowchart illustrating the process of setting the internal dimensions of a buzzer cavity according to preset low-frequency band requirements in a low-frequency acoustic cavity design method according to an embodiment of the present invention.

[0098] like Figure 4 As shown, in one or more embodiments, preferably, setting the internal dimensions of the buzzer cavity according to preset low-frequency band requirements specifically includes:

[0099] S401. Extract the current preset low-frequency band requirements and select the fundamental frequency of an externally excited buzzer.

[0100] S402. Based on the fundamental frequency, the internal dimensions of the buzzer cavity are set using the first calculation formula;

[0101] The first calculation formula is:

[0102]

[0103] Where fcav is the fundamental frequency, i.e. the resonant frequency of the corresponding buzzer cavity, in Hz; d is the diameter of the supporting edge, in cm; c is the speed of sound propagation, in cm / second; a is the radius of the sound emission hole, in cm; R is the wall thickness of the buzzer cavity, in cm; and h is the depth of the resonance cavity, in cm.

[0104] In this embodiment of the invention, a well-designed acoustic cavity allows for a good match between the buzzer and the acoustic cavity; therefore, the setting is based on the fundamental frequency of the externally excited buzzer.

[0105] Figure 5 This is a flowchart illustrating a method for designing a low-frequency acoustic cavity according to an embodiment of the present invention, which describes the setting of a sound wave transmission channel composed of the base plate and the sound baffle plate based on the current requirements of the low-frequency band.

[0106] like Figure 5 As shown, in one or more embodiments, preferably, the step of setting up the sound wave transmission channel composed of the base plate and the sound baffle plate according to the current low-frequency band requirements specifically includes:

[0107] S501. Select the base frequency of the corresponding externally excited buzzer chip according to the current low-frequency band requirements.

[0108] S502. Set up a sound wave transmission channel composed of the base plate and the sound baffle plate, and design the sound wave transmission channel into a short wave shape.

[0109] S503, making the fundamental frequency of the externally excited buzzer transmit in a standing wave state within the audio transmission channel, and determining the corresponding audio transmission channel form.

[0110] In this embodiment of the invention, the human body has an open external auditory canal, which senses changes in sound pressure at the tympanic membrane. The typical length of the human external auditory canal is approximately 25mm. Based on a resonance calculation using 1 / 4λ, and according to the physical formula V = f × λ, the resonant frequency is approximately 3.4kHz. This results in the human body amplifying sound waves in this frequency range. Therefore, based on this, an acoustic transmission channel was designed. To meet the resonant frequency requirements for sound wave transmission, the transmission channel is designed with a short, wave-like shape, small volume, and sufficient length to meet the resonant transmission requirements, while maintaining a consistent width. The transmission channel used in this embodiment of the invention allows low-frequency sound waves to transmit in a standing wave state, thus minimizing loss.

[0111] Figure 6 This is a flowchart illustrating a design method for a low-frequency acoustic cavity according to an embodiment of the present invention, which sets up multiple frequency point groups for audio frequencies such that the harmonics of each audio frequency in the frequency point group include a range of 3kHz ± 500Hz.

[0112] like Figure 6 As shown, in one or more embodiments, preferably, the setting of multiple audio frequency groups such that the harmonics of each audio in the frequency group include a range of 3kHz ± 500Hz specifically includes:

[0113] S601. By adjusting the structure of the buzzer cavity, a combination of resonant frequencies is achieved;

[0114] S602. If a combination is found where the harmonics of each audio frequency include a range of 3kHz ± 500Hz, then the buzzer cavity design corresponding to that combination shall be the final setting.

[0115] In this embodiment of the invention, multiple audio frequency groups are set up, and through the tuning cover, the harmonic frequency points in the range of 3kHz±500Hz have a good gain effect. The harmonics of each audio in the group include typical frequency values ​​such as 2.6kHz, 3kHz, 3.2kHz, and 3.5kHz.

[0116] In this embodiment of the invention, since the existing technology for testing acoustic intensity uses A-weighting in terms of acoustic testing standards, Figure 10 The weighting curve of the weighted sound pressure level is shown below. Figure 10As can be seen, in the A-weighted test, the 3kHz range represents the area with the highest boost gain. Therefore, using 500Hz or 4kHz as the resonant point is inefficient. The low-frequency acoustic range contributes to the low conversion efficiency of this sound generation method. Since the 3kHz range is a frequency point with high sound intensity efficiency weighting and is also a frequency point where the human ear is more sensitive, designing 3kHz as the highest harmonic peak is the most effective design method. Furthermore, since the designed sound is often a combination of several frequency points, designing the harmonics of these frequencies to their optimal positions is crucial for efficiency.

[0117] Figure 7 This is a flowchart illustrating the design of a tuning shield in a low-frequency acoustic cavity design method according to an embodiment of the present invention, which transforms a single resonance peak into two resonance peaks.

[0118] like Figure 7 As shown, in one or more embodiments, preferably, the design of the tuning shield transforms a single resonant peak into two resonant peaks, specifically including:

[0119] S701, Obtain the frequency point of the current required output;

[0120] S702. Set up a tuning shield so that a single resonant peak is transformed into two resonant peaks, and the audio energy of the two fundamental waves is superimposed on multiple harmonics, ultimately achieving multiple superpositions of audio near 3kHz.

[0121] In this embodiment of the invention, a tuning shield is designed to convert the audio from a single resonant peak to the desired double resonant peak, transforming the strongest single peak of the 3kHz sound wave into a double peak, thereby covering multiple harmonics of the two fundamental audio frequency points in the sound source.

[0122] According to a second aspect of the present invention, a design system for a low-frequency acoustic cavity is provided.

[0123] Figure 8 This is a structural diagram of a low-frequency acoustic cavity design system according to an embodiment of the present invention.

[0124] In one or more embodiments, preferably, the low-frequency acoustic cavity design system includes:

[0125] The structural setting module 801 is used to set the basic structure of the low-frequency acoustic cavity, the basic structure including a base plate, a middle buckle, a sound baffle plate and a tuning cover;

[0126] The buzzer setting module 802 is used to set a buzzer between the base plate and the middle buckle, and adopts a 35mm externally excited buzzer.

[0127] The cavity setting module 803 is used to set the internal dimensions of the buzzer cavity according to the preset low-frequency band requirements;

[0128] The transmission channel setting module 804 is used to set the sound wave transmission channel composed of the base plate and the sound baffle plate according to the current low frequency band requirements;

[0129] The frequency setting module 805 is used to set the frequency groups of multiple audio frequencies, so that the harmonics of each audio in the frequency group include a range of 3kHz±500Hz.

[0130] Tuning shield setting module 806 is used to design the tuning shield so that a single resonant peak is transformed into two resonant peaks.

[0131] In this embodiment of the invention, a system suitable for different structures is realized through a series of modular designs. This system can achieve closed-loop, reliable, and efficient execution by performing rapid modular analysis on each structure.

[0132] According to a third aspect of the present invention, a computer-readable storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement the method as described in any one of the first aspects of the present invention.

[0133] According to a fourth aspect of the present invention, an electronic device is provided. Figure 9 This is a structural diagram of an electronic device according to one embodiment of the present invention. Figure 9 The illustrated electronic device is a design device for a general-purpose low-frequency acoustic cavity, comprising a general-purpose computer hardware structure, including at least a processor 901 and a memory 902. The processor 901 and memory 902 are connected via a bus 903. The memory 902 is adapted to store instructions or programs executable by the processor 901. The processor 901 can be a standalone microprocessor or a collection of one or more microprocessors. Thus, the processor 901 executes the instructions stored in the memory 902, thereby performing the method flow of the embodiments of the present invention as described above to process data and control other devices. The bus 903 connects the aforementioned components together, and also connects these components to a display controller 904, a display device, and an input / output (I / O) device 905. The input / output (I / O) device 905 can be a mouse, keyboard, modem, network interface, touch input device, motion-sensing input device, printer, and other devices known in the art. Typically, the input / output device 905 is connected to the system via an input / output (I / O) controller 906.

[0134] Figure 10 This is a weighted curve of the weighted sound pressure level. Figure 11-20 The design method of this invention forms a series of basic structural diagrams of low-frequency acoustic cavities.

[0135] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0136] This invention achieves high low-frequency acoustic conversion efficiency with a very small space volume, solving the problems of low efficiency, high cost and large size of traditional low-frequency acoustic drives.

[0137] This invention utilizes the design theories of buzzer cavity, sound wave transmission, and sound wave resonance peak coupling to complete the overall design of a low-frequency acoustic cavity.

[0138] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0139] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0140] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0141] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0142] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for designing a low-frequency acoustic cavity, characterized in that, The method includes: The basic structure of the low-frequency acoustic cavity is set, which includes a base plate, a middle buckle, a sound baffle plate, and a tuning cover; A buzzer is installed between the base plate and the middle buckle, using a 35mm externally excited buzzer; The internal dimensions of the buzzer cavity are set according to the preset low-frequency band requirements; According to the current requirements for low-frequency band transmission, a sound wave transmission channel composed of the base plate and the sound-blocking plate is set up. Set up multiple frequency groups for audio frequencies, so that the harmonics of each audio frequency in the frequency group include a range of 3kHz±500Hz. The design of the tuning shield transforms a single resonant peak into two resonant peaks; Specifically, setting the internal dimensions of the buzzer cavity according to preset low-frequency band requirements includes: Extract the current preset low-frequency band requirements and select the fundamental frequency of an externally excited buzzer. Based on the fundamental frequency, the internal dimensions of the buzzer cavity are set using the first calculation formula; The first calculation formula is: in, fcav The fundamental frequency, i.e., the resonant frequency of the corresponding buzzer cavity, is expressed in units of... hz , d To support the edge diameter, unit cm , c The speed of sound propagation, measured in units. cm / Second, a The radius of the sound-emitting aperture, in units cm , R The wall thickness of the buzzer cavity, in units of cm , h The depth of the resonating cavity, in units cm ; The step of setting up a sound wave transmission channel composed of the base plate and the sound-blocking plate according to the current low-frequency band requirements specifically includes: Based on the current requirements for low-frequency transmission, select the corresponding fundamental frequency of the externally excited buzzer chip; A sound wave transmission channel composed of the base plate and the sound baffle is provided, and the sound wave transmission channel is designed in a short wave shape. This ensures that the fundamental frequency of the externally excited buzzer is transmitted in a standing wave state within the sound wave transmission channel, thus determining the corresponding sound wave transmission channel form. Specifically, setting multiple frequency point groups for audio frequencies, such that the harmonics of each audio frequency in the frequency point group include a range of 3kHz ± 500Hz, includes: By adjusting the structure of the buzzer cavity, a combination of resonant frequencies can be achieved; If, during verification, a combination is found where the harmonics of each audio frequency range includes a range of 3kHz ± 500Hz, then the corresponding buzzer cavity design is taken as the final setting.

2. The design method for a low-frequency acoustic cavity as described in claim 1, characterized in that, The aforementioned low-frequency acoustic cavity basic structure includes a base plate, a middle bracket, a sound baffle, and a tuning cover, specifically comprising: An external excitation signal is provided between the base plate and the middle buckle; The sound waves are transmitted to the tuning shield for adjustment through the sound transmission channel formed by the middle buckle and the sound baffle.

3. The design method for a low-frequency acoustic cavity as described in claim 1, characterized in that, The buzzer is installed between the base plate and the middle buckle, using a 35mm externally excited buzzer, specifically including: Obtain a plastic sheet with an outer diameter of 49mm; By pressing together a 35mm externally excited buzzer chip with a plastic sheet, the resonant frequency is reduced.

4. The design method for a low-frequency acoustic cavity as described in claim 1, characterized in that, The design of the tuning shield transforms a single resonant peak into two resonant peaks, specifically including: Obtain the frequency points of the current required output; By setting up a tuning shield, a single resonant peak is transformed into two resonant peaks, and the audio energy of the two fundamental frequencies is superimposed on multiple harmonics, ultimately achieving multiple superpositions of audio in the range of 3kHz±500Hz.

5. A design system for a low-frequency acoustic cavity, characterized in that, The system is used to implement the method as described in any one of claims 1-4, the system comprising: The structural setting module is used to set the basic structure of the low-frequency acoustic cavity, which includes a base plate, a middle clip, a sound baffle, and a tuning cover. A buzzer setting module is used to set a buzzer between the base plate and the middle buckle, using a 35mm externally excited buzzer; The cavity setting module is used to set the internal dimensions of the buzzer cavity according to the preset low-frequency band requirements; The transmission channel setting module is used to set the sound wave transmission channel composed of the base plate and the sound baffle plate according to the current low frequency band requirements; The frequency setting module is used to set the frequency groups of multiple audio frequencies, so that the harmonics of each audio in the frequency group include a range of 3kHz±500hz. The tuning shield setting module is used to design the tuning shield so that a single resonant peak is transformed into two resonant peaks.

6. A computer-readable storage medium storing computer program instructions thereon, characterized in that, The computer program instructions, when executed by a processor, implement the method as described in any one of claims 1-4.

7. An electronic device comprising a memory and a processor, characterized in that, The memory is used to store one or more computer program instructions, wherein the one or more computer program instructions are executed by the processor to implement the method as described in any one of claims 1-4.

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