Directional pulse sound source sounding device
By using the resonator and acoustic wave channel of the Fibonacci spiral line path in the directional pulse sound source sound generator, the problem of inability to effectively measure the directional reverberation time in the prior art is solved, and directional acoustic sensing and transmission are realized, and measurement accuracy and sound propagation efficiency are improved.
Patent Information
- Application Number
- CN202510249853.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2025-06-06
AI Technical Summary
The prior art cannot effectively measure the directional reverberation time, which has problems such as high difficulty, complex analysis process, easy to generate errors and high cost.
A directional pulse sound source sound generating device is adopted, which includes an upper arc frame and a lower arc frame that are hinged with each other, a built-in resonator and acoustic wave channel, and optimizes the sound wave propagation through the Fibonacci spiral line path to realize directional acoustic sensing and transmission.
The directional propagation of sound energy is realized, the sound propagation efficiency and measurement accuracy are improved, the operation complexity and cost are reduced, and the analysis process is simple and error is reduced.
Smart Images
Figure CN120094836A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to a sound-generating device, in particular to a directional pulse sound source sound-generating device. Background Art
[0002] Reverberation time (RT60) refers to the time required for the sound energy density in the room to decay from the initial value to one millionth of the original value (i.e., the sound pressure level decays by 60dB) after the sound source stops making sound. It is a key indicator in architectural design, especially in places that require specific acoustic effects, such as concert halls, theaters, and conference rooms. By adjusting the volume of the room, the use and layout of sound-absorbing materials, the reverberation time can be optimized to achieve the best acoustic effect. In addition to this field of architectural acoustics, the measurement of reverberation time can also be used in acoustic research in underwater acoustics, audio and communications, transportation and environmental fields, etc.
[0003] Conventional measurement methods for reverberation time, such as the steady-state noise cutoff method, the impulse response integration method, and the MLS maximum length sequence number method, usually use non-directional sound sources to measure the overall reverberation effect of the space. These methods are based on arranging sound sources and microphones in the indoor space, measuring and analyzing the attenuation of sound in the entire space, and obtaining the average reverberation time of the entire space, which cannot directly reflect the difference in reverberation time in different directions. For the directional measurement of reverberation time, there are correlation function methods, image source (IS) methods, and the use of directional sound sources. The first two methods require complex geometric acoustic simulation calculations and derive closed-form expressions for directional energy attenuation and reverberation time. This process involves relatively complex mathematical operations and requires high computing resources and professional knowledge. When facing some non-uniform acoustic environments, such as spaces with complex shapes, structures, or uneven distribution of sound-absorbing materials, such methods are difficult to use, the analysis process is complex, and errors are prone to occur. At the same time, the image source (IS) method is mainly applicable to rectangular parallelepiped rooms that are restricted by room shape. For the directional sound source method, the directional sound source of directional sound usually requires the use of more complex technology and equipment, which leads to its high cost. Compared with the traditional reverberation time measurement method, the use of directional sound source for measurement requires more investment, which may be a greater burden for some small laboratories or enterprises, and this method requires the operator to have certain professional knowledge and skills, otherwise it may lead to inaccurate measurement results.
[0004] In general, existing measurement technologies are unable to measure directional reverberation time and professional directional reverberation time. The measurement methods are difficult, the analysis process is complex, errors are likely to occur, and the cost is high. Summary of the invention
[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a directional pulse sound source sound-generating device with improved sound propagation efficiency and high measurement accuracy.
[0006] Technical solution: The directional pulse sound source sound-emitting device described in the present invention comprises an upper arc frame and a lower arc frame which are hinged to each other; a first additional mass block is arranged on the outer surface of the upper arc frame, a first resonator and a first sound wave channel are arranged on the inner surface, and a first sound reflection cover is arranged at the open end of the upper arc frame; a second additional mass block is arranged on the outer surface of the lower arc frame, a second resonator and a second sound wave channel are arranged on the inner surface, and a second sound reflection cover is arranged at the open end of the lower arc frame.
[0007] Furthermore, when the upper arc-shaped frame and the lower arc-shaped frame are closed, a gap is left near the hinged portion thereof.
[0008] Furthermore, the upper arc-shaped frame and the lower arc-shaped frame are connected via a hinged connector.
[0009] Furthermore, a layer of fine hair is attached to the upper contact surface and the lower contact surface on both sides of the upper arc frame and the lower arc frame respectively, so as to avoid mechanical impact at these contact parts and generate additional sound waves.
[0010] Furthermore, sound outlets are arranged on the first resonator and the second resonator on one side close to the opening end.
[0011] Furthermore, the first resonator is formed by a plurality of right-angled triangle units arranged continuously along a Fibonacci spiral.
[0012] Furthermore, the second resonator is formed by a plurality of right-angled triangle units arranged continuously along a Fibonacci spiral.
[0013] Furthermore, a first handle is provided on the outer surface of the upper arc frame, and a second handle is provided on the lower arc frame. The height of the first handle and the second handle is half of the height of a fist, which ensures that the hand can be close to the upper and lower frames when the hand holds the handle, so as to facilitate the hand to exert force.
[0014] Furthermore, the first additional mass block and the second additional mass block are both strip-shaped additional mass blocks, which are used to increase the potential energy of the flapper when force is applied by both hands, and can make the operation more labor-saving for people while emitting sound waves with the same energy.
[0015] Working principle: Vibration is generated by mechanical impact to emit pulse sound, and then the spectral characteristics of the pulse are optimized under the action of the carefully tuned resonance unit in the inner Fibonacci spiral resonator, ensuring uniform and reproducible sound energy distribution in the full frequency band (especially low frequency), and the highest sound pressure level in the full frequency band is stably floating at around 80dB. After the slapper is merged, the sound waves generated inside are transmitted from the sound outlet along the path of the Fibonacci spiral through the sound wave channel reserved in the resonator. Sound waves at certain angles may be refracted to the sound reflection cover outside the sound outlet at the sound outlet. The reflection cover can refract the sound once or multiple times to correct the direction of the sound wave. For sound waves that are difficult to correct, the sound wave energy will also be consumed under the action of multiple refractions to reduce the interference of such sound waves on later experiments.
[0016] The main innovations and functional points are the Fibonacci spiral resonator, the reserved sound wave channel, the outer surrounding structure of the frame and the arc frame. The core is to change the propagation direction and characteristics of the sound wave through the Fibonacci spiral path, push the sound energy from back to front, and thus achieve directional acoustic sensing and transmission. At the same time, the arc-shaped outer frame and sound reflection cover can not only enhance the aesthetic design of the product but also reduce the reflection and scattering of sound waves, thereby improving the efficiency of sound propagation. Although this design itself does not directly enhance the directionality of the sound, it can indirectly improve the clarity and propagation effect of the sound by reducing unnecessary sound wave interference.
[0017] How to use: First, hold the first handle and the second handle in the room or space where the reverberation time needs to be measured, then aim the sound outlet of the clap device in the direction where the reverberation time characteristics need to be measured, apply normal force with both hands, and the inner sides of the first resonator and the second resonator will collide with each other, producing a consistent and reproducible sound.
[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant features:
[0019] 1. The device is simple and easy to understand, easy to operate, can be stimulated by applying normal force with both hands, and emits consistent and reproducible sounds. The measurement steps are simplified, the measurement process is clearer and more specific, the analysis process is simple, it is not easy to produce errors, and the cost is low;
[0020] 2. After the pulse sound source is generated, the sound wave is transmitted from the sound outlet along the path of the Fibonacci spiral through the reserved sound wave channel, pushing the sound energy from back to front, thereby realizing the directional propagation of the pulse sound source;
[0021] 3. The carefully tuned resonance unit optimizes the spectrum characteristics of the pulse to ensure uniform and reproducible sound energy distribution in the full frequency band (especially low frequency). When measured at a distance of two meters in a semi-anechoic chamber, the maximum low-frequency sound pressure level can reach more than 70dB, and the maximum sound pressure level from low frequency to high frequency is also within 80dB with a fluctuation of no more than 10dB. Through the specially optimized mechanical design, instantaneous pulse sound covering the full frequency band is generated, and the peak sound pressure level is as high as 128dB, which meets the needs of large space measurement;
[0022] 4. The arc-shaped frames of the upper arc frame and the lower arc frame make the beater look more beautiful and reduce the reflection and scattering of sound waves, thereby improving the efficiency of sound propagation. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of the first viewing angle of the present invention;
[0024] Figure 2 It is a structural schematic diagram of the second viewing angle of the present invention;
[0025] Figure 3 It is a structural schematic diagram of the third viewing angle of the present invention;
[0026] Figure 4 This is a schematic structural diagram of the upper arc frame 1 of the present invention from a first viewing angle;
[0027] Figure 5 This is a schematic structural diagram of the upper arc frame 1 of the present invention from a second viewing angle;
[0028] Figure 6 is a partial enlarged view of the first additional mass block 3 of the present invention;
[0029] Figure 7 is a partial enlarged view of the first resonator 4 of the present invention;
[0030] Figure 8 This is a schematic structural diagram of the lower arc frame 2 of the present invention from a first viewing angle;
[0031] Fig. 9 This is a schematic structural diagram of the lower arc frame 2 of the present invention from a second viewing angle;
[0032] Fig.10 It is a schematic diagram of the connection between the upper arc frame 1 and the lower arc frame 2 of the present invention;
[0033] Fig.11 This is a data graph of the highest sound pressure level of the entire frequency band measured in a semi-anechoic chamber at a distance of two meters. DETAILED DESCRIPTION
[0034] like Figures 1 to 3The upper arc frame 1 and the lower arc frame 2 of the directional pulse sound source sound generating device are both made of wood, and are hinged by three iron hinge connectors 11, so that they can be opened and closed at a certain angle, and the normal use of the flapper is guaranteed. The function and use of the lower arc frame 2 are the same as those of the upper arc frame 1. When the upper arc frame 1 and the lower arc frame 2 are closed, a gap is left near the hinged part. The connection surface of the upper arc frame 1 and the lower arc frame 2 when they are fitted together meets the Fibonacci spiral.
[0035] like Figures 4 to 7 The outer surface of the upper arc frame 1 is provided with a first additional mass block 3 of iron, the inner surface is provided with a first resonator 4 and a first sound wave channel 5 of colloid, and the open end of the upper arc frame 1 is provided with a first sound reflection cover 6. A layer of fine hair with a thickness of 4mm is attached to the upper contact surface 101 on both sides of the upper arc frame 1 to prevent the flapper from generating interfering sound waves due to mechanical collision when in use, and reduce the influence of unnecessary sound sources on directional sound propagation. The additional mass block is used to increase the potential energy of the flapper during operation, making the operation more labor-saving. The first resonator 4 is composed of a plurality of right-angled triangular units with an acute angle of 15° arranged continuously along the Fibonacci spiral, and a plurality of first sound wave channels 5 are reserved in the middle. The front end of the first sound wave channel 5 is a sound outlet 12. The first sound wave channel 5 and the sound outlet 12 are the air gap and the front end opening in the first resonator 4 and the second resonator 8 when the frame is merged. The outer surface of the upper arc frame 1 is provided with a first handle 13 made of wood. The first additional mass block 3 is an arc strip. The first sound wave channel 5 is used for directional propagation of sound, and the first resonator 4 is used for optimizing the frequency spectrum characteristics of the pulse to ensure uniform and reproducible sound energy distribution in the whole frequency band, especially in the low frequency.
[0036] like Figures 8 to 10 The outer surface of the lower arc frame 2 is provided with a second additional mass block 7 of iron, the inner surface is provided with a second resonator 8 and a second sound wave channel 9 made of colloid, and the open end of the lower arc frame 2 is provided with a second sound reflection cover 10. A layer of fine hair with a thickness of 4 mm is attached to the lower contact surface 201 on both sides of the lower arc frame 2 to prevent the flapper from generating interfering sound waves due to mechanical collision when in use, and reduce the influence of unnecessary sound sources on directional sound propagation. The additional mass block is used to increase the potential energy of the flapper during operation, making the operation more labor-saving. A sound outlet 12 is provided on one side of the second resonator 8 near the open end. The second resonator 8 is composed of a plurality of right-angled triangular units with an acute angle of 15° arranged continuously along the Fibonacci spiral. A second handle 14 made of wood is provided on the lower arc frame 2. The height of the first handle 13 and the second handle 14 is half of the height of the hand after making a fist, and a little margin is left between the hand and the frame when holding the handle. The second additional mass block 7 is an arc strip. The second sound wave channel 9 is used for directional propagation of sound, and the second resonator 8 is used for optimizing the spectral characteristics of the pulse to ensure uniform and reproducible sound energy distribution in the whole frequency band, especially in the low frequency.
[0037] like Fig.11 , measured at a distance of two meters in a semi-anechoic chamber, the maximum low-frequency sound pressure level it produces can reach over 70dB, and the maximum sound pressure level from low frequency to high frequency fluctuates within 10dB around 80dB. Through specially optimized mechanical design, it produces instantaneous pulse sound covering the entire frequency band, with a peak sound pressure level of up to 128dB, which meets the needs of large space measurement.
[0038] When the slapper is used, the frame combines to generate mechanical collision vibration to generate a pulse sound source. Under the action of the first resonator 4 and the second resonator 8, the spectrum characteristics of the pulse are optimized, and the sound wave then propagates from back to front through the sound outlet 12 along the Fibonacci spiral path of the channel. The first sound reflection cover 6 and the second sound reflection cover 10 are located in the outermost circle of the frame, forming a circle of surrounding layer around the sound outlet 12, and its shape is a continuation of the arc of the frame, making the overall shape more coordinated and performing secondary deviation correction on the direction of the sound wave.
Claims
1. A directional pulse sound source sound generating device, characterized in that: The invention comprises an upper arc-shaped frame (1) and a lower arc-shaped frame (2) which are hinged to each other; a first additional mass block (3) is arranged on the outer surface of the upper arc-shaped frame (1), a first resonator (4) and a first sound wave channel (5) are arranged on the inner surface, and a first sound reflection cover (6) is arranged at the open end of the upper arc-shaped frame (1); a second additional mass block (7) is arranged on the outer surface of the lower arc-shaped frame (2), a second resonator (8) and a second sound wave channel (9) are arranged on the inner surface, and a second sound reflection cover (10) is arranged at the open end of the lower arc-shaped frame (2).
2. A directional pulse sound source sound generating device according to claim 1, characterized in that: When the upper arc-shaped frame (1) and the lower arc-shaped frame (2) are closed, a gap is left near their hinged parts.
3. A directional pulse sound source sound generating device according to claim 1, characterized in that: The upper arc-shaped frame (1) and the lower arc-shaped frame (2) are connected via a hinged connector (11).
4. A directional pulse sound source sound generating device according to claim 1, characterized in that: A layer of fine hair is attached to the upper contact surface (101) and the lower contact surface (201) on both sides of the upper arc-shaped frame (1) and the lower arc-shaped frame (2).
5. A directional pulse sound source sound generating device according to claim 1, characterized in that: The first resonator (4) and the second resonator (8) are both provided with sound outlets (12) on one side close to the opening end.
6. A directional pulse sound source sound generating device according to claim 1, characterized in that: The first resonator (4) is composed of a plurality of right-angled triangle units arranged continuously along a Fibonacci spiral.
7. A directional pulse sound source sound generating device according to claim 1, characterized in that: The second resonator (8) is composed of a plurality of right-angled triangle units arranged continuously along a Fibonacci spiral.
8. A directional pulse sound source sound generating device according to claim 1, characterized in that: A first handle (13) is provided on the outer surface of the upper arc-shaped frame (1).
9. A directional pulse sound source sound generating device according to claim 8, characterized in that: A second handle (14) is provided on the lower arc-shaped frame (2).
10. A directional pulse sound source sound generating device according to claim 9, characterized in that: The height of the first handle (13) and the second handle (14) is half the height of a fist.