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CN-116013232-B - Design method and system of low-frequency acoustic sound cavity

CN116013232BCN 116013232 BCN116013232 BCN 116013232BCN-116013232-B

Abstract

The invention relates to the technical field of acoustics, in particular to a design method and a system of a low-frequency acoustic sound cavity. The scheme includes that a low-frequency sound cavity basic structure is arranged, the basic structure comprises a bottom plate, a middle buckle, a sound baffle plate and a tuning cover, a buzzer is arranged between the bottom plate and the middle buckle, a separate excitation type buzzer with the specification of 35mm is adopted, the internal size of the buzzer cavity is arranged according to the preset low-frequency band requirement, a sound wave transmission channel formed by the bottom plate and the sound baffle plate is arranged according to the current low-frequency band requirement, a plurality of frequency point groups of audios are arranged, the harmonic wave of each audio frequency in the frequency point groups comprises a range of 3khz +/-500 hz, and the tuning cover is designed to enable a single resonance peak to be converted into 2 resonance peaks. According to the scheme, through the use of the arrangement of the acoustic detection, the human body acoustic induction mechanism, the buzzer and the supporting mode, the vibration sounding characteristic of the buzzer and the buzzer cavity are combined, and the high-efficiency and low-cost acoustic driving design is realized.

Inventors

  • GUO YU

Assignees

  • 格睿通智能科技（深圳）有限公司
  • 青鸟消防股份有限公司

Dates

Publication Date
20260508
Application Date
20221230

Claims (7)

  1. 1. A method of designing a low frequency acoustic cavity, the method comprising: Setting a low-frequency sound cavity basic structure, wherein the basic structure comprises a bottom plate, a middle buckle, a sound baffle plate and a tuning cover; a buzzing piece is arranged between the bottom plate and the middle buckle, and a separate excitation buzzing piece with the specification of 35mm is adopted; Setting the internal size of the buzzing cavity according to the preset low-frequency band requirement; according to the current low-frequency band transmission requirement, setting a sound wave transmission channel formed by the base plate and the sound baffle; Setting a frequency point group of a plurality of audios, so that the harmonic wave of each audio in the frequency point group comprises a range of 3khz +/-500 hz; designing the tuning mask so that a single resonance peak is converted into 2 resonance peaks; Wherein, according to the low frequency band requirement of predetermineeing, carry out buzzing cavity's inside size setting, specifically include: Extracting the current preset low-frequency band requirement, and selecting the fundamental frequency of a separate excitation type buzzer; According to the fundamental frequency, setting the internal size of the beeping sound cavity by using a first calculation formula; The first calculation formula is as follows: wherein fcav is fundamental frequency, namely resonance frequency of a corresponding buzzing sound cavity, the unit hz, d is the diameter of a supporting edge, the unit cm, c is the propagation speed of sound, the unit cm/s, a is the radius of a sound emitting hole, the unit cm, R is the wall thickness of the buzzing sound cavity, the unit cm, h is the depth of the resonance cavity, and the unit cm; According to the requirement of the current low-frequency band transmission, the sound wave transmission channel formed by the bottom plate and the sound baffle plate is arranged, and the method specifically comprises the following steps: selecting the base frequency of the corresponding separate excitation type buzzer according to the requirement of the current low-frequency band; The sound wave transmission channel formed by the bottom plate and the sound baffle plate is arranged, and the sound wave transmission channel is designed into a short wave shape; the fundamental frequency of the separately excited buzzer is transmitted in a standing wave state in the sound wave transmission channel, and the corresponding sound wave transmission channel form is determined; the method for setting the frequency point groups of the plurality of audios, which ensures that the harmonic wave of each audio frequency in the frequency point groups comprises a range of 3khz plus or minus 500hz, specifically comprises the following steps: by adjusting the structure of the buzzing sound cavity, a combination of resonant frequencies appears; Checking that if the harmonic wave of each audio frequency corresponding to one combination comprises a range of 3khz plus or minus 500hz, the buzzing sound cavity corresponding to the combination is designed as a final setting.
  2. 2. The method for designing a low-frequency acoustic cavity according to claim 1, wherein the low-frequency acoustic cavity is provided with a basic structure, the basic structure comprises a bottom plate, a middle buckle, a sound baffle plate and a tuning cover, and the method specifically comprises the following steps: An external excitation signal is arranged between the bottom plate and the middle buckle; and the sound wave is transmitted to the tuning cover for adjustment through a transmission channel of the sound wave formed by the middle buckle and the sound baffle plate.
  3. 3. The method for designing a low-frequency acoustic cavity according to claim 1, wherein a buzzer is disposed between the bottom plate and the middle button, and a separate excitation type buzzer with a specification of 35mm is adopted, specifically comprising: Obtaining a plastic sheet with the outer diameter of 49 mm; And (3) superposing the separately excited buzzer with the specification of 35mm and the plastic sheet in a pressing mode, and reducing the resonance frequency point.
  4. 4. The method for designing a low frequency acoustic cavity according to claim 1, wherein said tuning mask is designed such that a single formant is converted into 2 formants, specifically comprising: Acquiring the frequency point of the output of the current requirement; And setting a tuning cover, converting a single resonance peak into 2 resonance peaks, superposing the audio energy of 2 fundamental waves on multiple harmonics, and finally realizing multiple superposition of the audio within the range of 3khz plus or minus 500 hz.
  5. 5. A system for designing a low frequency acoustic chamber, the system for implementing the method of any one of claims 1-4, the system comprising: The structure setting module is used for setting a low-frequency sound cavity basic structure, and the basic structure comprises a bottom plate, a middle buckle, a sound baffle plate and a tuning cover; The buzzer setting module is used for setting a buzzer between the bottom plate and the middle buckle, and adopts a separate excitation type buzzer with the specification of 35 mm; The cavity setting module is used for setting the internal size of the buzzing cavity according to the preset low-frequency band requirement; The transmission channel setting module is used for setting a sound wave transmission channel formed by the base plate and the sound baffle according to the current low-frequency band transmission requirement; the frequency point setting module is used for setting frequency point groups of a plurality of audios, so that the harmonic wave of each audio in the frequency point groups comprises a range of 3khz plus or minus 500 hz; and the tuning cover setting module is used for designing the tuning cover so that a single resonance peak is converted into 2 resonance peaks.
  6. 6. A computer readable storage medium, on which computer program instructions are stored, which computer program instructions, when executed by a processor, implement the method of any of claims 1-4.
  7. 7. An electronic device comprising a memory and a processor, wherein the memory is configured 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 of any of claims 1-4.

Description

Design method and system of low-frequency acoustic sound cavity Technical Field The invention relates to the technical field of acoustics, in particular to a design method and a system of a low-frequency acoustic sound cavity. Background The acoustic sound cavity of the traditional fire alarm device generally works in the high frequency range from 2khz to 4khz, and the sound frequency range below 600hz can lose great conversion energy. However, the acoustic alarm frequency band of the fire alarm device is required to be different corresponding to a specific region and position, and the frequency band is required to be between 400 and 600hz for a part of regions. Before the invention, the resonance frequency point of the buzzer in the prior art cannot achieve the low frequency band, and the sound efficiency is sacrificed to achieve the corresponding frequency band through the design of the sound cavity, so that the problem of low capacity conversion efficiency of the traditional low-frequency sound cavity is required to be solved, and the high-efficiency conversion in the low frequency band is realized. Disclosure of Invention In view of the above problems, the present invention provides a method and a system for designing a low-frequency acoustic cavity, which combines the vibration sounding characteristics of a buzzer with the setting of the buzzer cavity by using the setting of acoustic detection, human acoustic sensing mechanism and the buzzer and its supporting mode, so as to realize the high-efficiency and low-cost acoustic driving design. According to a first aspect of an embodiment of the present invention, a method for designing a low-frequency acoustic cavity is provided. In one or more embodiments, preferably, the method for designing a low-frequency acoustic cavity includes: Setting a low-frequency sound cavity basic structure, wherein the basic structure comprises a bottom plate, a middle buckle, a sound baffle plate and a tuning cover; a buzzing piece is arranged between the bottom plate and the middle buckle, and a separate excitation buzzing piece with the specification of 35mm is adopted; Setting the internal size of the buzzing cavity according to the preset low-frequency band requirement; According to the current low-frequency band transmission requirement, setting a sound wave transmission channel formed by the base plate and the sound baffle; Setting a frequency point group of a plurality of audios, so that the harmonic wave of each audio in the frequency point group comprises a range of 3khz +/-500 hz; the tuning mask was designed such that a single resonance peak was converted to 2 resonance peaks. In one or more embodiments, preferably, the low-frequency acoustic cavity basic structure is provided, and the basic structure includes a base plate, a middle buckle, a sound baffle plate and a tuning cover, and specifically includes: An external excitation signal is arranged between the bottom plate and the middle buckle; and the sound wave is transmitted to the tuning cover for adjustment through a transmission channel of the sound wave formed by the middle buckle and the sound baffle plate. In one or more embodiments, preferably, a buzzer is disposed between the bottom plate and the middle buckle, and a separate excitation type buzzer with a specification of 35mm is adopted, which specifically includes: Obtaining a plastic sheet with the outer diameter of 49 mm; And (3) superposing the separately excited buzzer with the specification of 35mm and the plastic sheet in a pressing mode, and reducing the resonance frequency point. In one or more embodiments, preferably, the setting of the internal size of the buzzer cavity according to the preset low-frequency band requirement specifically includes: Extracting the current preset low-frequency band requirement, and selecting the fundamental frequency of a separate excitation type buzzer; According to the fundamental frequency, setting the internal size of the beeping sound cavity by using a first calculation formula; The first calculation formula is as follows: Wherein fcav is fundamental frequency, namely resonance frequency of a corresponding buzzing sound cavity, the units hz and d are supporting edge diameters, the unit cm is propagation speed of sound, the unit cm/s, the unit a is radius of a sound emitting hole, the unit cm is R is wall thickness of the buzzing sound cavity, the unit cm is h is resonant cavity depth, and the unit cm is the resonant cavity depth. In one or more embodiments, preferably, the setting a sound wave transmission channel formed by the base plate and the sound baffle according to the requirement of the current low-frequency band specifically includes: selecting the base frequency of the corresponding separate excitation type buzzer according to the requirement of the current low-frequency band; Setting a sound wave transmission channel formed by the bottom plate and the sound baffle plate, and designing the sound