Vehicle identification device based on microphone

Abstract

The utility model discloses a vehicle identification device based on a microphone. The vehicle identification device comprises a base, a circuit board and an upper cover, the base comprises a bottom cover, a vibration enhancing film and a vibration enhancing film cover plate; the vibration enhancing membrane is obliquely placed between the bottom cover and the vibration enhancing membrane cover plate; the circuit board comprises a support plate and a circuit board body, and the support plate is provided with a hollow space for placing the circuit board body; the upper cover comprises a top cover, a sound signal filtering blade, an audio enhancement film cover plate, an audio enhancement film and an audio enhancement film supporting plate; the sound signal filtering blade is fixedly connected to the top cover, and the top cover is fixedly connected with the audio enhancement film cover plate; the audio enhancement film is placed between the audio enhancement film supporting plate and the audio enhancement film cover plate. According to the utility model, through the physical structure design of the vibration enhancing membrane, the counterweight and the audio enhancing membrane, the amplification of vibration signals and sound signals is realized by utilizing resonance, so that the recognition capability and the recognition distance of vehicle engine noise and tire noise are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle recognition devices, specifically relating to a microphone-based vehicle recognition device. Background Technology

[0002] Microphone-based vehicle identification devices are devices that identify vehicle types using microphones and voice recognition technology. They typically use voice signal processing and machine learning techniques to identify different types of vehicles by analyzing engine and tire noise. They can be used in various applications such as traffic monitoring, parking management, and intelligent transportation systems.

[0003] Existing microphone-based vehicle recognition devices typically lack acoustic duct designs, resulting in omnidirectional audio acquisition by the microphone. In windy or rainy conditions, the target vehicle's sound signal can easily be drowned out by ambient noise. Furthermore, existing microphone-based vehicle recognition devices typically lack sound signal amplification structures, leading to weak recognition capabilities for vehicles at long distances. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the purpose of this invention is to provide a microphone-based vehicle recognition device to overcome the problems of short recognition distance and poor environmental adaptability in existing vehicle recognition devices. This invention's vehicle recognition device can achieve long-distance vehicle type recognition in various environments, including wind and rain.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model discloses a microphone-based vehicle recognition device, comprising: a base, a circuit board, and a top cover;

[0007] The base includes a bottom cover, a vibration-enhancing membrane, and a vibration-enhancing membrane cover plate; the vibration-enhancing membrane is placed obliquely between the bottom cover and the vibration-enhancing membrane cover plate, and the bottom cover and the vibration-enhancing membrane cover plate are fixedly connected by long screws;

[0008] The circuit board includes a support plate and a circuit board body. The support plate has a hollow space for placing the circuit board body. The support plate and the circuit board body are fixedly connected by long screws. The support plate is fixedly connected to the vibration enhancement membrane cover plate.

[0009] The upper cover includes a top cover, sound signal filter blades, an audio enhancement film cover plate, an audio enhancement film, and an audio enhancement film support plate; the sound signal filter blades are fixedly connected to the top cover, and the top cover and the audio enhancement film cover plate are fixedly connected by hexagonal copper pillars; the audio enhancement film is placed between the audio enhancement film support plate and the audio enhancement film cover plate, and the audio enhancement film support plate and the audio enhancement film cover plate are fixedly connected by long screws; the audio enhancement film support plate is also fixedly connected to a support plate.

[0010] Furthermore, a counterweight metal block is provided on the vibration enhancement membrane, and the counterweight metal block is located in the center of the vibration enhancement membrane; two O-rings with an outer diameter of 4mm are provided on the cover plate of the vibration enhancement membrane.

[0011] Furthermore, the support plate is provided with two O-ring vent holes with a diameter of 4mm, which are matched with the O-rings on the vibration enhancement membrane cover plate.

[0012] Furthermore, the circuit board body is an STM32L451VET6 circuit board, on which an STM32L451VET6 processing chip, two analog microphones, and one digital microphone are disposed; the position of the analog microphone corresponds to the position of the O-type vent on the support plate of the circuit board; the position of the digital microphone is connected to the O-type vent on the audio enhancement diaphragm support plate.

[0013] Furthermore, the circuit board body is also equipped with an SWD debugging interface, a reset button, a USB debugging interface, a serial port debugging interface, a display screen connection interface, and a 3.3V power interface.

[0014] Furthermore, the sound signal filter blade has six blades, which are placed at equal intervals of 60 degrees on a 360-degree plane.

[0015] Furthermore, the audio enhancement diaphragm support plate is provided with an O-ring with an outer diameter of 34mm and an O-ring vent hole with a diameter of 6mm.

[0016] The beneficial effects of this utility model are:

[0017] 1. Strong environmental adaptability: The acoustic duct design, consisting of sound signal filter blades, O-rings, and vents, improves the directionality and signal-to-noise ratio of sound pickup, thereby ensuring stable operation of the equipment in windy and rainy environments.

[0018] 2. Long recognition distance: Through the physical structure design of the vibration enhancement membrane and its counterweight and audio enhancement membrane, resonance is used to amplify the vibration signal and sound signal, thereby improving the recognition ability and recognition distance of vehicle engine noise and tire noise.

[0019] 3. Stable structure and easy to carry: The equipment adopts a compact modular design, and each component is fixed with screws, which enhances the overall structural stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the device of this utility model.

[0021] Figure 2 This is a schematic diagram of the base in the device of this utility model.

[0022] Figure 3 for Figure 2 A schematic diagram of the structure from viewpoint A.

[0023] Figure 4 This is a schematic diagram of the circuit board structure in the device of this utility model.

[0024] Figure 5 for Figure 4 A schematic diagram of the structure from viewpoint B.

[0025] Figure 6 This is a schematic diagram of the structure of the upper cover in the device of this utility model.

[0026] Figure 7 for Figure 6 A schematic diagram of the structure from the C-view. Detailed Implementation

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] Reference Figures 1 to 7 As shown, a microphone-based vehicle recognition device of this utility model includes: a base 1, a circuit board 2, and a top cover 3.

[0029] The base 1 includes a bottom cover 101, a vibration enhancement membrane 103, and a vibration enhancement membrane cover plate 104; the vibration enhancement membrane 103 is placed obliquely between the bottom cover 101 and the vibration enhancement membrane cover plate 104, and the bottom cover 101 and the vibration enhancement membrane cover plate 104 are fixedly connected by long screws.

[0030] The circuit board 2 includes a support plate 201 and a circuit board body 204. The support plate 201 is provided with a hollow space 202 for placing the circuit board body 204. The support plate 201 and the circuit board body 204 are fixedly connected by long screws. The support plate 201 is fixedly connected to the vibration enhancement membrane cover plate 104.

[0031] The upper cover 3 includes a top cover 301, sound signal filter blades 302, an audio enhancement membrane cover plate 304, an audio enhancement membrane 305, and an audio enhancement membrane support plate 306. The sound signal filter blades 302 are fixedly connected to the top cover 301, and the top cover 301 and the audio enhancement membrane cover plate 304 are fixedly connected by hexagonal copper pillars 303. The audio enhancement membrane 305 is placed between the audio enhancement membrane support plate 306 and the audio enhancement membrane cover plate 304, and the audio enhancement membrane support plate 306 and the audio enhancement membrane cover plate 304 are fixedly connected by long screws. The audio enhancement membrane support plate 306 is also fixedly connected to the support plate 201.

[0032] The vibration enhancement membrane 103 is provided with a counterweight metal block 102, which is located in the center of the vibration enhancement membrane 103; the vibration enhancement membrane cover plate 104 is provided with two O-rings 105 with an outer diameter of 4mm.

[0033] The support plate 201 is provided with two O-shaped vent holes 203 with a diameter of 4mm, and the vent holes 203 cooperate with the O-rings 105 on the vibration enhancement membrane cover plate 104.

[0034] The circuit board body 204 is an STM32L451VET6 circuit board, on which an STM32L451VET6 processing chip 212, two analog microphones 206, and one digital microphone 205 are disposed. The position of the analog microphone 206 corresponds to the position of the O-type vent 203 on the support plate 201 of the circuit board. The position of the digital microphone 205 is connected to the O-type vent 308 on the audio enhancement diaphragm support plate 306.

[0035] The circuit board body 204 is also provided with an SWD debugging interface 207, a reset button 208, a USB debugging interface 209, a serial port debugging interface 211, a display screen connection interface 210, and a 3.3V power interface 213.

[0036] The sound signal filter blade 302 is provided with six blades, which are placed at equal intervals of 60 degrees on a 360-degree plane.

[0037] The audio enhancement diaphragm support plate 306 is provided with an O-ring 307 with an outer diameter of 34mm and an O-ring vent 308 with a diameter of 6mm.

[0038] When a vehicle passes by, the vibration amplification membrane 103 amplifies the vibration signal propagating across the ground surface and transmits the signal to the digital microphone 205 through the 4mm diameter O-type vent 203, and then sends it to the STM32L451VET6 processing chip 212 on the circuit board body 204; the sound signal filter blade 302 filters the sound signal propagating through the air, and after the sound signal is amplified by the audio amplification membrane 305, it is transmitted to the analog microphone 206 through the 6mm diameter O-type vent 308, and then sent to the STM32L451VET6 processing chip 212 on the circuit board body 204; after analyzing the vibration signal and the sound signal, the STM32L451VET6 processing chip outputs the result to the display screen through the display screen connection interface 210.

[0039] In this invention, the circuit board body 204 is subjected to SWD debugging via SWD debugging interface 207, the circuit board body 204 is reset via reset button 208, the circuit board body 204 is subjected to USB debugging via USB debugging interface 209, the circuit board body 204 is subjected to serial debugging via serial port debugging interface 211, and the circuit board body 204 is supplied with power via 3.3V power interface 213.

[0040] There are many specific applications of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of this utility model, and these improvements should also be considered within the protection scope of this utility model.

Claims

1. A microphone-based vehicle recognition device, characterized in that, include: Base, circuit board and top cover; The base includes a bottom cover, a vibration-enhancing membrane, and a vibration-enhancing membrane cover plate; the vibration-enhancing membrane is placed obliquely between the bottom cover and the vibration-enhancing membrane cover plate, and the bottom cover and the vibration-enhancing membrane cover plate are fixedly connected. The circuit board includes a support plate and a circuit board body. The support plate has a hollow space for placing the circuit board body. The support plate and the circuit board body are fixedly connected. The support plate is fixedly connected to the vibration enhancement membrane cover plate. The upper cover includes a top cover, sound signal filter blades, an audio enhancement membrane cover plate, an audio enhancement membrane, and an audio enhancement membrane support plate; the sound signal filter blades are fixedly connected to the top cover, and the top cover is fixedly connected to the audio enhancement membrane cover plate; the audio enhancement membrane is placed between the audio enhancement membrane support plate and the audio enhancement membrane cover plate, and the audio enhancement membrane support plate is fixedly connected to the audio enhancement membrane cover plate; the audio enhancement membrane support plate is also fixedly connected to a support plate.

2. The microphone-based vehicle identification apparatus according to claim 1, characterized by, A counterweight metal block is provided on the vibration enhancement membrane, and the counterweight metal block is located in the center of the vibration enhancement membrane; two O-rings with an outer diameter of 4mm are provided on the cover plate of the vibration enhancement membrane.

3. The microphone-based vehicle identification apparatus according to claim 2, characterized by, The support plate is provided with two O-ring vents with a diameter of 4mm, which are matched with the O-rings on the vibration enhancement membrane cover plate.

4. The microphone-based vehicle identification apparatus according to claim 3, characterized by The circuit board body is an STM32L451VET6 circuit board, on which an STM32L451VET6 processing chip, two analog microphones, and one digital microphone are mounted. The position of the analog microphone corresponds to the position of the O-type vent on the support plate. The position of the digital microphone is connected to the O-type vent on the audio enhancement diaphragm support plate.

5. The microphone-based vehicle recognition device according to claim 1, characterized in that, The circuit board body is also equipped with an SWD debugging interface, a reset button, a USB debugging interface, a serial port debugging interface, a display screen connection interface, and a 3.3V power interface.

6. The microphone-based vehicle identification apparatus of claim 1, wherein, The sound signal filter blade has six blades, which are placed at 60-degree intervals on a 360-degree plane.

7. The microphone-based vehicle recognition device according to claim 1, characterized in that, The audio enhancement diaphragm support plate is provided with an O-ring with an outer diameter of 34mm and an O-ring vent hole with a diameter of 6mm.

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