Megaphone and megaphone control method

Abstract

The application provides a megaphone and a megaphone control method, and belongs to the technical field of device control. The megaphone comprises a shell, the shell comprising a large cylinder, a medium cylinder and a small cylinder, a loudspeaker being mounted on the small cylinder; a handle being arranged at the rear end of the shell, the handle being a hollow structure, a counterweight being arranged in the handle; a megaphone box being arranged on the shell, a microphone and a plurality of function buttons being arranged on the megaphone box; a control host being arranged at the rear end of the shell, a main control circuit board being arranged in the control host; a front-end function assembly being arranged at the front end of the shell and being detachably connected with the shell, the front-end function assembly comprising an illuminating lamp module and a camera module; the small cylinder, the medium cylinder and the large cylinder being coaxially sleeved, the opening direction of the small cylinder and the large cylinder being forward, the opening direction of the medium cylinder being rearward; the cross-sectional area of the small cylinder, the medium cylinder and the large cylinder gradually increasing along the sound wave propagation direction. The application can solve the problems of complicated operation and low work efficiency of the megaphone in the prior art.

Description

Technical Field

[0001] This application relates to the field of equipment control technology, and in particular to a megaphone and a megaphone control method. Background Technology

[0002] With the continuous upgrading of security and duty operations, the role of megaphones in actual use has gradually evolved from a simple amplification tool to a multi-functional on-site operation terminal. However, the functions of existing megaphones are relatively limited, with most products only having amplification capabilities, failing to meet the diversified operational needs of duty sites, such as lighting, video evidence collection, and warning signal output. Users often need to carry multiple independent devices simultaneously during duty, including megaphones, high-powered flashlights, cameras, and warning lights, resulting in heavy equipment and cumbersome switching operations, severely impacting on-site operational efficiency. Although some products have attempted to integrate lighting or recording functions into megaphones, the lack of a reasonable structural layout and hardware partitioning design makes electrical interference between functional modules prone to occur, leading to decreased equipment reliability. Furthermore, the low integration of front-end functional components makes maintenance inconvenient. Therefore, how to provide a megaphone that is easy to operate and highly efficient has become a pressing technical problem to be solved in this field. Summary of the Invention

[0003] This application provides a megaphone and a megaphone control method to solve the problems of cumbersome operation and low work efficiency of megaphones in the prior art.

[0004] According to one aspect of the embodiments of this application, a megaphone is provided, comprising: The housing includes a large trumpet, a medium trumpet, and a small trumpet, with a loudspeaker mounted on the small trumpet. The handle is located at the rear end of the housing. The handle has a hollow structure and contains a counterweight. The megaphone box is mounted on the casing and includes a microphone and multiple function buttons. The control unit is located at the rear of the housing, and the main control circuit board is installed inside the control unit; The front-end functional components are located at the front of the housing and are detachably connected to the housing. The front-end functional components include a lighting module and a camera module. The small, medium, and large tubes are coaxially nested, with the openings of the small and large tubes facing forward and the opening of the medium tube facing backward. The emitting end of the small tube faces the inside of the medium tube, and the emitting end of the medium tube faces the inside of the large tube. The cross-sectional area of ​​the small, medium, and large tubes increases progressively along the sound wave propagation path. The sound waves emitted by the loudspeaker are initially reflected and converged by the inner wall of the small tube before entering the interior of the medium tube. After being reflected by the inner wall of the medium tube and changing their propagation direction, they enter the interior of the large tube. After being reflected by the inner wall of the large tube and changing their propagation direction again, they radiate outward.

[0005] According to one aspect of the embodiments of this application, a megaphone control method is provided, including: In response to the power switch being triggered, the loudspeaker is powered on and enters standby mode; In response to the activation of the loudspeaker button, the loudspeaker amplification mode is started, and the microphone is controlled to collect audio signals and output them through the speaker. In response to the lighting button being triggered, control the lighting module to turn on or off; In response to the recording button being triggered, the camera module is controlled to start video recording and save it to the memory card; In response to the camera button being triggered, the camera module is controlled to take a picture and save it to the memory card; In response to the play button being pressed, play pre-stored audio or audio files from the memory card; In response to the recording button being triggered, audio signals are captured through the microphone and stored to the memory card.

[0006] According to one aspect of the embodiments of this application, a control host is provided, the control host including a processor and a memory, the memory storing a computer program, the computer program being loaded and executed by the processor to implement the above-described megaphone control method.

[0007] According to one aspect of the embodiments of this application, the computer program product includes a computer program stored in a computer-readable storage medium. The processor of a control host reads the computer program from the computer-readable storage medium and executes the computer program, causing the control host to perform the aforementioned megaphone control method.

[0008] The beneficial effects of the megaphone and megaphone control method provided in this application embodiment are as follows: a large megaphone, a medium megaphone, and a small megaphone are coaxially nested in sequence, with their opening directions matched. The opening directions of the small megaphone and the medium megaphone are opposite, and the opening directions of the medium megaphone and the large megaphone are opposite, with their cross-sectional areas increasing progressively along the direction of sound wave propagation. The sound waves emitted by the loudspeaker are initially reflected and converged by the inner wall of the small megaphone before entering the interior of the medium megaphone. Because the opening direction of the medium megaphone is opposite to that of the small megaphone, the sound waves are reflected by the inner wall of the medium megaphone and change their propagation direction. After diffusion, they enter the interior of the large megaphone, and after further reflection and diffusion by the inner wall of the large megaphone, they radiate outward. In this process, the sound waves form a folded propagation path within a limited axial space. The three-stage horn effectively performs three relay-style expansion and reinforcement of the sound waves within a compact shell length. This allows the sound energy, originally concentrated in a small aperture, to be fully released in a progressively expanding channel. This avoids the drawbacks of an excessively long axial dimension in a single-stage horn and achieves high sound pressure level long-distance amplification with a relatively small overall size. Furthermore, the front-end functional components integrate a lighting module and a camera module, directly integrating lighting and video evidence collection functions into the megaphone's front end. Users no longer need to carry additional high-powered flashlights and cameras; a single device can meet multiple operational needs such as on-site amplification, lighting, and evidence collection, reducing equipment burden and simplifying operation. Simultaneously, the front-end functional components are detachably connected to the shell, allowing users to quickly replace or maintain the front-end functional modules according to actual task requirements, effectively solving the problem of inconvenient maintenance in traditional integrated structures. In addition, the handle is located at the rear of the housing and has a counterweight inside, which shifts the center of gravity of the machine to the handle grip area. Users do not need to continuously apply a counterforce to balance the weight of the front horn when holding it, which greatly reduces the strain on the wrists during long-term operation.

[0009] Therefore, this embodiment of the application achieves the organic integration of lighting and camera functions while ensuring long-distance amplification performance, effectively reducing the user's equipment load and operational complexity, improving work efficiency, and enhancing the comfort of holding the device for extended periods. It is suitable for promotion and application in scenarios such as public security duty, fire rescue, and on-site control. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a megaphone, shown on the right side, according to an embodiment of this application. Figure 2This is a schematic diagram of the structure of a megaphone, shown in the left side view, according to an embodiment of this application. Figure 3 This application provides a schematic diagram of the structure of each horn of a megaphone. Figure 4 This is a flowchart of a megaphone control method provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a control host provided in an embodiment of this application. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0013] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0014] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used herein are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0015] Figure 1 The following is a schematic diagram of the structure of a megaphone provided in an embodiment of this application, showing that the megaphone includes: a large megaphone 1, an infrared probe 2, a camera module 3, a lighting module 4, a medium megaphone 5, a strap hole 6, a megaphone box 7, a spring wire 8, and a handle 9. Figure 2 The left side view of a megaphone provided in this application embodiment is shown in the figure. The megaphone also includes: a display screen 10, a control host 11, a power switch 12, and a charging port 13. Figure 3 The diagram shows the structure of each horn of a megaphone provided in this application embodiment. As can be seen from the diagram, the small horn 14, the medium horn 5, and the large horn 1 are coaxially sleeved. The openings of the small horn 14 and the large horn 1 face forward, while the opening of the medium horn 5 faces backward. The emitting end of the small horn 14 faces the inside of the medium horn 5, and the emitting end of the medium horn 5 faces the inside of the large horn 1. A loudspeaker 15 is installed on the small horn 14.

[0016] In this embodiment of the application, the megaphone includes: The housing includes a large tube 1, a medium tube 5 and a small tube 14, with a speaker 15 mounted on the small tube 14. The handle 9 is located at the rear end of the housing. The handle 9 has a hollow structure and a counterweight is installed inside. The megaphone box 7 is mounted on the casing and has a microphone and multiple function buttons. The control host 11 is located at the rear end of the housing, and the main control circuit board is installed inside the control host 11; The front-end functional components are located at the front of the housing and are detachably connected to the housing. The front-end functional components include a lighting module 4 and a camera module 3. The small trumpet 14, medium trumpet 5, and large trumpet 1 are coaxially fitted together. The openings of the small trumpet 14 and large trumpet 1 face forward, while the opening of the medium trumpet 5 faces backward. The emitting end of the small trumpet 14 faces the interior of the medium trumpet 5, and the emitting end of the medium trumpet 5 faces the interior of the large trumpet 1. The cross-sectional areas of the small trumpet 14, medium trumpet 5, and large trumpet 1 increase progressively along the sound wave propagation path. The sound waves emitted by the loudspeaker 15 are initially reflected and converged by the inner wall of the small trumpet 14 before entering the interior of the medium trumpet 5. After being reflected by the inner wall of the medium trumpet 5 and having their propagation direction changed, the sound waves enter the interior of the large trumpet 1. After being reflected by the inner wall of the large trumpet 1 and having their propagation direction changed, the sound waves radiate outward.

[0017] In this embodiment, as Figure 1 As shown, the megaphone includes a housing, a handle 9, a megaphone box 7, a control host 11, and front-end functional components. The housing serves as the external support structure for the megaphone, housing and mounting the speaker 15 and various functional components. The housing includes a large trumpet 1, a medium trumpet 5, and a small trumpet 14, all coaxially fitted together. The openings of the small trumpet 14 and the large trumpet 1 face forward, while the opening of the medium trumpet 5 faces backward. Each of the three has a through-cavity for sound waves to pass through and amplify. The speaker 15 is mounted on the small trumpet 14, with the sound-emitting surface of the speaker 15 facing the internal cavity of the small trumpet 14. This allows the speaker to convert audio electrical signals into sound waves and radiate them into the small trumpet 14 after power is applied. The large trumpet 1, medium trumpet 5, and small trumpet 14 can be injection molded from ABS engineering plastic, ensuring structural strength while also meeting lightweight requirements. The sound pressure level after amplification is no less than 65 dB at a distance of 100 meters.

[0018] The handle 9 is located at the rear of the housing and is used by the user to grip and operate the megaphone. The handle 9 has a hollow structure with an internal space for accommodating the counterweight and allowing connecting cables to pass through. The counterweight is a heavy component made of a high-density metal and is used to adjust the overall center of gravity of the megaphone. The hollow structure of the handle 9 optimizes the grip feel and provides space for the counterweight. The handle 9 also has a strap hole 6 for attaching a shoulder strap or lanyard for easy carrying. For example, based on the statistical data that the average hand length of Chinese adults is 17cm-20cm, the grip circumference of the handle 9 is set to 22cm-28cm, preferably 25cm. This circumference selection allows the handle 9 to have a 5cm-8cm margin over the hand length, enabling the hand to maintain a natural fist-like posture when gripped. The counterweight weighs 40g-60g and is used to shift the center of gravity of the megaphone to the central stress point of the handle 9.

[0019] The megaphone box 7 is mounted on the housing, specifically on the upper surface of the large megaphone 1. The megaphone box 7 is equipped with a microphone and multiple function buttons. The microphone is a sound acquisition device used to convert the user's voice into electrical signals. The multiple function buttons are physical push-button switches, each connected to the control host 11 via an independent signal line. Each function button corresponds to a control signal, allowing the user to input different operating commands to achieve the corresponding function.

[0020] The control host 11 is located at the rear of the housing, in front of the handle 9. The control host 11 contains a main control circuit board. This main control circuit board is a printed circuit board containing electronic components, integrating a main control IC, memory, power management circuit, audio power amplifier circuit, and various drive circuits to realize signal processing, logic judgment, and function control of the megaphone.

[0021] The front-end functional component is located at the front of the housing and is detachably connected to it. The front-end functional component is an integrated functional module, including a lighting module 4 and a camera module 3. The light-emitting surface of the lighting module 4 faces forward of the megaphone, emitting light to meet lighting needs in dim environments. The lens of the camera module 3 faces forward of the megaphone, used to capture image or video data of the scene in front. The detachable connection between the front-end functional component and the housing allows users to remove the front-end functional component from the housing for maintenance, replacement, or upgrades as needed.

[0022] In the amplification structure, the small trumpet 14, medium trumpet 5, and large trumpet 1 are nested sequentially from the inside out, forming a three-layer coaxial nested cylindrical structure. The openings of the small trumpet 14 and large trumpet 1 face forward, while the opening of the medium trumpet 5 faces backward. The exit end of the small trumpet 14 extends into the cavity of the medium trumpet 5, allowing sound waves to exit from the small trumpet 14 and enter the medium trumpet 5; similarly, the exit end of the medium trumpet 5 extends into the cavity of the large trumpet 1, allowing sound waves to exit from the medium trumpet 5 and enter the large trumpet 1. The small trumpet 14 has the smallest cross-sectional area, the medium trumpet 5 has a medium cross-sectional area, and the large trumpet 1 has the largest cross-sectional area. As the sound waves propagate from the small trumpet 14 through the medium trumpet 5 to the large trumpet 1, the cavity space it traverses gradually expands.

[0023] Loudspeaker 15 is mounted at the rear end of trumpet 14, and sound waves propagate from the rear end of trumpet 14 to the front end. Within the confined cavity of trumpet 14, the sound waves are reflected by the inner wall surface, and after multiple reflections, gradually converge towards the center of the cavity, forming a highly directional sound beam that enters the medium-sized trumpet 5 from the exit end of trumpet 14. Since the opening of medium-sized trumpet 5 faces rearward, the sound waves, upon entering medium-sized trumpet 5, are reflected by the inner wall surface and change their propagation direction from forward to backward. Simultaneously, the wavefront begins to spread outward and is initially broadened, then enters the large-sized trumpet 1 from the exit end of medium-sized trumpet 5. Since the opening of large-sized trumpet 1 faces forward, the sound waves, upon entering large-sized trumpet 1, are reflected again by the inner wall surface and change their propagation direction from backward to forward. The wavefront is further expanded, and finally radiates outward from the front opening of large-sized trumpet 1, achieving high sound pressure level long-distance amplification.

[0024] This embodiment employs a structure with three horns coaxially nested together and progressively increasing cross-sectional areas. Combined with the reverse nesting design of the small horn 14 and the large horn 1 facing forward, and the medium horn 5 facing forward, the sound waves propagate along a folded path within the limited axial length of the shell. After a progressive acoustic treatment involving initial convergence, secondary reflection and diffusion, and tertiary reflection and expansion, the sound waves radiate outward. This ensures both the efficiency of sound energy convergence and the full expansion of the wavefront, thereby achieving long-distance amplification within a limited axial dimension.

[0025] From the above, it can be concluded that the large trumpet 1, medium trumpet 5, and small trumpet 14 are coaxially nested in sequence, with their opening directions matched. The opening directions of the small trumpet 14 and medium trumpet 5 are opposite, and the opening directions of the medium trumpet 5 and large trumpet 1 are opposite. Furthermore, their cross-sectional areas increase progressively along the direction of sound wave propagation. The sound waves emitted by the loudspeaker 15 are initially reflected and converged by the inner wall of the small trumpet 14 before entering the interior of the medium trumpet 5. Since the opening direction of the medium trumpet 5 is opposite to that of the small trumpet 14, the sound waves are reflected by the inner wall of the medium trumpet 5, changing their propagation direction. After diffusion, they enter the interior of the large trumpet 1, and are further reflected and diffused by the inner wall of the large trumpet 1 before radiating outward. In this process, the sound waves form a folded propagation path within a limited axial space. The three-stage horn effectively performs three relay-style expansion and reinforcement of the sound waves within a compact shell length. This allows the sound energy, originally concentrated in a small aperture, to be fully released in a progressively expanding channel. This avoids the drawbacks of an excessively long axial dimension in a single-stage horn and achieves high sound pressure level long-distance amplification with a relatively small overall size. Furthermore, the front-end functional components integrate a lighting module 4 and a camera module 3, directly integrating lighting and video evidence collection functions into the megaphone's front end. Users no longer need to carry additional high-powered flashlights and cameras; a single device can meet multiple operational needs such as on-site amplification, lighting, and evidence collection, reducing equipment burden and simplifying operation. Simultaneously, the front-end functional components are detachably connected to the shell, allowing users to quickly replace or maintain the front-end functional modules according to actual task requirements, effectively solving the problem of inconvenient maintenance in traditional integrated structures. In addition, the handle 9 is located at the rear of the housing and has a counterweight inside, which shifts the center of gravity of the whole machine to the grip area of ​​the handle 9. When holding it, the user does not need to continuously apply a counterforce to balance the weight of the front horn, which greatly reduces the strain on the wrist during long-term operation.

[0026] Therefore, this embodiment of the application achieves the organic integration of lighting and camera functions while ensuring long-distance amplification performance, effectively reducing the user's equipment load and operational complexity, improving work efficiency, and enhancing the comfort of holding the device for extended periods. It is suitable for promotion and application in scenarios such as public security duty, fire rescue, and on-site control.

[0027] In one embodiment of this application, the handle 9 includes a first clamp and a second clamp that engage with each other; The joint surfaces of the first clamp and the second clamp adopt a flat tenon connection structure. The flat tenon connection structure includes a protruding male groove on the first clamp and a matching female groove on the second clamp. The inner wall of the female groove is coated with a sealant layer. When the male and female grooves are engaged, the sealant layer fills the gap between them, forming an integrated sealing ring that fits snugly with the tenon joint structure.

[0028] In this embodiment, the handle 9 adopts a split structure design, including a first clamp and a second clamp that interlock with each other. The two are symmetrically arranged along the axial direction of the handle 9. During assembly, they are aligned and locked together by fasteners to form a complete cylindrical handle 9 structure. The split structure allows the counterweight and internal cable to be placed in a preset position before interlocking, reducing assembly difficulty and facilitating subsequent maintenance by opening the handle 9 for internal opening.

[0029] To achieve a reliable seal between the first and second clamping bodies, their mating surfaces employ a tenon joint structure. This tenon joint structure includes a raised male groove on the first clamping body and a matching female groove on the second clamping body. The raised male groove is a strip-shaped protrusion extending along the mating surface of the first clamping body, and the female groove is a strip-shaped groove extending along the mating surface of the second clamping body; their cross-sectional shapes match. When the first and second clamping bodies are engaged, the raised male groove inserts into the female groove, and the outer wall of the male groove fits against the inner wall of the female groove, forming a tortuous sealing path. This extends the path length required for external moisture and dust to penetrate the handle 9.

[0030] To further improve sealing performance, a sealant layer is applied to the inner wall of the female groove. This sealant layer is a gel-like coating formed by uncured sealant applied to the inner wall of the female groove. It can be made of silicone sealant and is fluid in its uncured state, allowing it to fully wet the inner wall of the female groove. During the interlocking process of the first and second clamps, the protruding male groove is gradually pressed into the female groove. The outer wall of the male groove presses against the sealant layer on the inner wall of the female groove, causing the uncured sealant to flow under pressure and fill all the tiny gaps between the male and female grooves, including the gap between the male groove end face and the bottom wall of the female groove, as well as the gap between the male groove sidewall and the female groove sidewall, thereby eliminating the voids between them. After a certain period of time at room temperature, the sealant undergoes a cross-linking and curing reaction, transforming from a fluid paste into an elastic solid. The cured sealant firmly adheres to the surfaces of the male and female grooves, its shape perfectly matching the shape of the gap between them, forming an integrated sealing ring that tightly fits the tenon joint structure. This integrated sealing ring forms a continuous elastic sealing barrier between the male and female grooves. When subjected to external water or air pressure, it undergoes elastic deformation, further compressing and filling the gaps, effectively preventing moisture and dust from entering the handle 9. After the sealant cures, it integrates seamlessly with the tenon joint structure, preventing loosening due to vibration or temperature changes and ensuring reliable sealing during long-term use.

[0031] This embodiment utilizes the synergistic cooperation between the tenon joint structure and the sealant layer to mechanically interlock and form a tortuous sealing path. At the same time, the integrated sealing ring formed after the sealant cures fills the microscopic gaps that cannot be eliminated by mechanical interlocking, achieving a reliable sealing effect. This allows the megaphone to work normally in outdoor rainy, snowy, and dusty environments, preventing short circuits or damage to internal electronic components due to moisture or dust intrusion, and improving the megaphone's environmental adaptability and service life.

[0032] In one embodiment of this application, the front-end functional component and the housing are detachably connected by a screw locking structure; The spiral locking structure includes an internal thread located inside the housing of the front functional component and an external thread located on the outer ring of the front end of the housing, wherein the internal thread and the external thread are engaged and screwed together. The spiral locking structure is also equipped with a sealing gasket, which is located at the mating point of the internal and external threads.

[0033] In this embodiment, to facilitate users in replacing front-end functional components of different specifications according to actual needs, or to remove and repair a specific functional module when it malfunctions, the front-end functional components and the housing are connected in a detachable manner. Specifically, the front-end functional components and the housing are detachably connected through a screw-locking structure. This structure utilizes the engagement of the threaded pair to achieve a firm connection and repeated assembly and disassembly between the two components. Connection and separation can be completed by rotation, making the operation simple and the connection reliable.

[0034] The spiral locking structure includes an internal thread located inside the housing of the front-end functional component and an external thread located on the outer ring of the front end of the housing. The internal thread is a spiral protrusion extending continuously in the circumferential direction on the inner wall of the front-end functional component housing, and the external thread is a spiral protrusion extending continuously in the circumferential direction on the outer ring of the front end of the housing. Their tooth profiles match and can mesh with each other. During assembly, the front-end functional component is fitted onto the outer ring of the front end of the housing, aligning the starting end of the internal thread with the starting end of the external thread, and then rotated clockwise. Under the action of rotational force, the tooth profiles of the internal and external threads mesh with each other, and the front-end functional component gradually moves axially towards the housing until a tight, close fit is achieved, at which point a secure connection is achieved. During disassembly, the front-end functional component is rotated counterclockwise, and the internal and external threads gradually disengage, allowing the front-end functional component to be removed from the housing.

[0035] The spiral locking structure also includes a sealing gasket, an annular sealing element made of elastic material, located at the root step of the internal thread or the root step of the external thread. When the front-end functional component is tightened to the housing via the internal and external threads, the end face of the front-end functional component gradually approaches the front-end face of the housing. During this process, the sealing gasket undergoes elastic deformation under axial compression, its volume is compressed and expands outwards, tightly filling the gap between the end face of the front-end functional component and the front-end face of the housing. Due to the elasticity of the sealing gasket, it generates a rebound force after being compressed, ensuring that the sealing gasket always fits tightly between the two contact surfaces, forming a continuous annular sealing barrier.

[0036] This embodiment, through the synergistic cooperation of the aforementioned spiral locking structure and sealing gasket, provides a reliable mechanical connection force for the threaded engagement, ensuring that the front-end functional components will not loosen due to vibration or external force during use. Simultaneously, the threaded engagement is uniform and the force is distributed, providing excellent anti-vibration and anti-loosening performance. When the threads are tightened, the sealing gasket is pressed between the front-end functional components and the housing, effectively preventing external moisture and dust from entering the housing through the tiny gaps at the threaded connection, achieving waterproof and dustproof functions and ensuring the megaphone's normal use in outdoor rain, snow, and dusty environments. Furthermore, the threaded connection method allows for the disassembly and assembly of the front-end functional components without the need for specialized tools; users can perform the rotation operation by hand, facilitating daily maintenance and parts replacement.

[0037] In one embodiment of this application, the front-end functional components further include an infrared night vision light, a strobe light, and a fill light; Lighting module 4 is connected to the main control circuit board via an independent plug; Camera module 3 is connected to the main control circuit board via a video signal cable; The infrared night vision light, strobe light, and fill light share a single integrated cable connected to the main control circuit board.

[0038] In this embodiment, in addition to the lighting module 4 and the camera module 3, the front-end functional components also include an infrared night vision light, a strobe light, and a fill light, which are used to realize night vision imaging, red-blue warning, and low-light fill light functions, respectively. To avoid electrical interference between the functional modules, the front-end functional components and the main control circuit board are connected by three sets of independent lines for hardware wiring.

[0039] The lighting module 4 connects to the main control circuit board via an independent plug, forming a dedicated one-to-one power supply circuit. This circuit is not shared with other modules, ensuring that the high current of the lighting module 4 during operation will not cause electrical interference to other modules. The camera module 3 connects to the main control circuit board via a video signal cable, forming an independent video signal channel to ensure the stability of video transmission and image clarity. The infrared night vision light, strobe light, and fill light share an integrated cable connected to the main control circuit board. This integrated cable has a multi-core branch structure, with each core corresponding to the control signal of the infrared night vision light, the strobe drive signal of the strobe light, and the soft light control signal of the fill light. Each signal is transmitted independently within the cable, without competing for control. The shared integrated cable effectively reduces the number of openings in the device body and the mess of wiring, simplifying the wiring structure.

[0040] The microphone is connected to the audio acquisition pin of the main control circuit board via an independent audio lead or surface mount method, without occupying the above three main lines, ensuring the independence of audio acquisition and low noise.

[0041] In this embodiment, through the hardware wiring division of the above three sets of independent lines, each functional module has its own independent electrical circuit. The hardware circuit and the drive circuit are completely independent and do not interfere with each other. At the same time, the night vision, strobe and fill light functions share a single integrated cable, which optimizes the internal wiring structure while ensuring functional independence.

[0042] In one embodiment of this application, the integrated ribbon cable has a multi-core branch structure, which includes a first branch, a second branch, and a third branch. The main control circuit board is equipped with: The lighting drive circuit is connected to the independent plug of the lighting module 4; The decoding interface of camera module 3 is connected to the video signal cable of camera module 3; The infrared night vision constant current drive branch is connected to the first branch inside the integrated cable; The flash circuit branch is connected to the second branch inside the integrated cable; The fill light soft light control branch is connected to the third branch inside the integrated cable; Audio amplification and acquisition circuit, connected to the microphone.

[0043] In this embodiment, the integrated ribbon cable is a wire harness containing multiple independent core wires that are insulated from each other. Each core wire transmits signals independently within the ribbon cable, and the signals converge at the connector interfaces at both ends of the ribbon cable. The multi-core branch structure includes a first branch, a second branch, and a third branch. Each branch is an independent core wire, corresponding to the control signal transmission of the infrared night vision light, the strobe light, and the fill light, respectively.

[0044] The main control circuit board is the core control component of the megaphone. It integrates multiple functional circuits, each arranged in a hardware partition according to the function it controls, ensuring independent and non-interfering control logic. The lighting drive circuit is a power drive circuit used to control the on / off state and brightness adjustment of the lighting module 4. It forms a one-to-one power supply circuit with the independent plug of the lighting module 4 via an independent wire, and is not shared with other modules. The camera module 3 decoding interface is an interface circuit used to receive and process the video signals from the camera module 3. It has a built-in video decoding chip used to decode the video signals output by the camera module 3 into digital signals before transmitting them to the main control IC. The infrared night vision constant current drive branch provides a stable constant current to the infrared night vision light, and it is connected to the infrared night vision light through the first branch inside the integrated cable. The strobe light circuit branch controls the on / off state of the strobe light according to a preset frequency to achieve alternating red and blue light or strong light strobe effects, and it is connected to the strobe light through the second branch inside the integrated cable. The fill light soft light control branch controls the on / off state of the fill light, and it is connected to the fill light via the third branch inside the integrated ribbon cable. The audio amplification and acquisition circuit includes a preamplifier and an analog-to-digital converter. The preamplifier amplifies the weak audio signal acquired by the microphone to a suitable processing level, and the analog-to-digital converter converts the amplified analog audio signal into a digital signal for processing by the main control IC. It is connected to the microphone via a separate audio lead or surface mount method, without occupying the three branches of the integrated ribbon cable.

[0045] In this embodiment, through the hardware partitioning layout of the main control circuit board, each functional circuit is independent and connected to the corresponding functional module through independent lines, realizing independent control of each function such as lighting, camera, infrared night vision, strobe, supplementary light and audio acquisition, and each function does not interfere with each other.

[0046] In one embodiment of this application, the function buttons on the megaphone box 7 include: The first button is used to control the on / off state of the lighting module 4; The second button is used to control the start and stop of camera module 3; The third button is used to cycle through the functions of the integrated ribbon cable. A short press of the third button turns on the fill light, a long press triggers the infrared night vision light, and a double press activates the strobe light. Among them, a short press is an operation with a press duration of less than the first preset duration; a long press is an operation with a press duration of greater than or equal to the first preset duration; and a double press is an operation with a time interval of less than the second preset duration between any two presses.

[0047] In this embodiment, the multiple function buttons on the megaphone box 7 are physical push-button switches used for users to input different operation commands. Each button is connected to the main control circuit board via an independent signal line. The main control IC determines the type of user's press operation by detecting changes in the voltage level of each button and executes the corresponding function control logic.

[0048] The first button is used to control the on / off state of the lighting module 4. When the user presses the first button, the main control IC controls the lighting drive circuit to turn on or off, and the on / off state of the lighting module 4 switches once with each press.

[0049] The second button is used to control the start and stop of camera module 3. When the user presses the second button, the main control IC controls camera module 3 to start video recording and save it to the memory card; pressing it again stops recording and saves the video file.

[0050] The third button is used to cycle through the functions of the integrated ribbon cable. Users trigger different functions by pressing the third button in different ways: a short press turns on the fill light, a long press triggers the infrared night vision light, and a double press activates the strobe light.

[0051] The first preset duration is a pre-set time threshold, such as 1 second. When the duration of the user pressing the button from pressing to releasing is less than this threshold, the main control IC recognizes the operation as a short press.

[0052] When a user presses a button for a duration greater than or equal to a first preset duration, the main control IC recognizes the operation as a long press. Short presses and long presses are distinguished by whether the press duration reaches the first preset duration; the same button corresponds to different functions under different press durations.

[0053] The second preset duration is used to determine whether two adjacent presses constitute a "continuous" press. When the time interval between the release and the next press is less than the second preset duration, the two presses are considered a single click operation. When the user presses the button multiple times consecutively with each interval less than the second preset duration, the main control IC recognizes this group of operations as a continuous click and triggers the strobe light. Through the above differentiation mechanism, the same third button triggers three different functions—fill light, infrared night vision light, and strobe light—under three different operation modes: short press, long press, and continuous click, respectively, realizing multi-functional integrated control of a single button.

[0054] In this embodiment, through the aforementioned differentiation mechanism, the same third button can trigger three different functions—fill light, infrared night vision light, and strobe light—under three different operating modes, thereby achieving multi-functional integrated control with a single button.

[0055] In one embodiment of this application, the control host 11 is provided with a display screen 10, which is used to display the preview image captured by the camera module 3 in real time, and to play back the stored video recordings and photos. The control host 11 is also equipped with a memory card slot for inserting an external memory card to store video, photo and audio data.

[0056] In this embodiment, the control host 11 is located at the rear end of the housing and in front of the handle 9, and a main control circuit board is installed inside it. The control host 11 is equipped with a display screen 10, which is the visual interactive interface of the megaphone, used to present the images captured by the camera module 3 as well as stored video recordings and photos and other data information to the user.

[0057] When the megaphone is powered on and the camera module 3 is in operation, the image data captured by the camera module 3 is transmitted to the main control circuit board via the video signal cable. After decoding, the main control IC displays the image in real time on the display screen 10 through the display screen 10 driver circuit. Users can observe the scene currently being pointed at by the camera module 3 in real time by looking at the display screen 10, making it easy to adjust the shooting angle and composition. When users need to view the captured evidence, they can enter the file viewing interface through the playback operation. The main control IC reads the video and photo files from the memory card and displays them in a list on the display screen 10. Users can select the target file using the arrow keys to play or view it. For video files, playback control operations such as play, pause, and fast forward are supported. For photo files, zooming is supported to view details. The playback function allows users to verify the captured content in real time on-site and confirm the validity of the evidence.

[0058] The control unit 11 also features a memory card slot with internal metal contacts corresponding to the memory card's gold fingers for inserting external memory cards. Once inserted, the main control IC reads and writes to the memory card via the memory card interface protocol. Video files recorded by the camera module 3, photographs taken, and audio files captured by the microphone are automatically saved to the external memory card. The removable memory card design allows users to replace the card to expand storage capacity when needed, or to remove the card and connect it to external devices such as a computer via a card reader for easy data export, backup, and subsequent analysis and processing.

[0059] This embodiment, through the configuration of the display screen 10 and the memory card slot, realizes real-time preview of the captured image, on-site playback of the stored content, and external storage of data. Users can confirm the shooting effect through real-time preview and verify the evidence content through the playback function, ensuring the effectiveness and accuracy of on-site evidence collection. At the same time, the pluggable design of the external memory card allows for flexible expansion of storage capacity and facilitates data export and transfer, meeting the continuous recording needs in long-duration duty scenarios.

[0060] Figure 4 A flowchart of a megaphone control method provided in this application embodiment; the method can be applied to the megaphone shown in the above embodiment, and the method can be executed by a control host, and may include: S101: In response to the power switch being triggered, the megaphone is powered on and enters standby mode.

[0061] In this embodiment, the power switch is a push-button main power switch; pressing it down turns it on, and raising it turns it off. This switch is the main power switch for the megaphone; whether using the megaphone, loudspeaker, and lighting functions individually, or using the camera, audio recorder, and photographer functions, this switch must be turned on first.

[0062] When the user presses the main power switch to turn it on, the power management circuit inside the megaphone supplies power to the main control IC and various functional modules. The main control IC completes its initialization self-test, the display lights up and shows the standby interface, and each functional module is in standby mode, waiting for user commands. At this time, the megaphone enters standby mode, and the user can select the appropriate function to operate according to actual usage needs.

[0063] S102: In response to the activation of the shout button, the shout amplification mode is started, and the microphone is controlled to collect audio signals and output them through the speaker.

[0064] In this embodiment, the megaphone box is equipped with a loudspeaker button, which is a physical push-button switch. When the user briefly presses the loudspeaker button, the main control IC detects that the button has been triggered, and then controls the audio power amplifier circuit to turn on, and the working indicator light illuminates, indicating that the megaphone function has been activated.

[0065] At this point, the microphone begins to collect the user's audio signal. The collected audio signal is amplified by the preamplifier in the audio amplification and acquisition circuit, processed by the main control IC, and then amplified by the audio power amplifier circuit to a power level sufficient to drive the speaker. Finally, it is output through the speaker and the three-stage horn. The user can adjust the output volume using the volume up and volume down buttons.

[0066] When the user presses the amplification button again, the main control IC disconnects the audio power amplifier circuit, the indicator light goes out, and the amplification stops.

[0067] S103: In response to the lighting button being triggered, control the lighting module to turn on or off.

[0068] In this embodiment, when the user briefly presses the power button, the main control IC detects that the button has been triggered and then controls the lighting drive circuit to turn on, powering on the lighting module and outputting strong light to meet the lighting needs in low-light environments. When the user briefly presses the power button again, the main control IC controls the lighting drive circuit to turn off, and the lighting module is powered off.

[0069] S104: In response to the recording button being triggered, control the camera module to start video recording and save it to the memory card.

[0070] In this embodiment, when the user briefly presses the record button, the main control IC detects that the button has been triggered and immediately controls the camera module to start video recording. Simultaneously, the display shows the recording feed in real time, and the video data is processed by the main control IC and stored on the memory card. In recording mode, if the user briefly presses the record button again, the main control IC controls the camera module to stop video recording and automatically saves the video file.

[0071] In this embodiment, in response to the recording button being triggered, the main control IC controls the camera module to start video recording. During video recording, the main control IC obtains the current ambient brightness value through the photosensitive element built into the camera module. The main control IC compares the obtained ambient brightness value with a preset first brightness threshold. If the ambient brightness value is greater than the first brightness threshold, the main control IC encodes and compresses the video data at a first compression rate and then stores it to the memory card; if the ambient brightness value is less than or equal to the first brightness threshold, the main control IC encodes and compresses the video data at a second compression rate, where the second compression rate is greater than the first compression rate, and then stores it to the memory card.

[0072] If the ambient brightness value is greater than the first brightness threshold, it indicates that the current environment is well-lit. The image captured by the camera module has less noise, and a lower compression rate can be used to retain higher image quality details. That is, the video data is encoded and compressed at the first compression rate and then stored on the memory card.

[0073] If the ambient brightness value is less than or equal to the first brightness threshold, it indicates that the current environment is under-lit, and the image captured by the camera module has a lot of noise. In this case, even if compression is performed at a high compression rate, the loss of image quality is not noticeable to the human eye. However, using a higher compression rate can significantly reduce the size of the video file, thereby saving storage space. Therefore, in this case, encoding and compression are performed at the second compression rate.

[0074] In response to the recording button being triggered, the main control IC controls the camera module to start video recording. During video recording, the main control IC performs motion detection on the video frame. Specifically, the main control IC performs pixel-by-pixel difference calculation between the current frame image output by the camera module and the previous frame image, counts the number of pixels with a difference value greater than a preset difference threshold, and calculates the proportion of this number to the total number of pixels in the frame as the motion area percentage. If the motion area percentage is less than the preset proportion in three consecutive frames, the main control IC controls the video recording to pause and enter a standby state, while continuing motion detection on the frame; in response to detecting that the motion area percentage is greater than or equal to the preset proportion, the main control IC controls the video recording to resume.

[0075] In this embodiment, after the main control IC processes each frame of the image output by the camera module into grayscale, it performs a difference calculation on the grayscale values ​​of the corresponding pixels in the current frame and the previous frame, and counts the number of pixels whose difference is greater than a preset difference threshold. The proportion of this number to the total number of pixels in the image is the motion area proportion. If this proportion is less than a preset proportion in three consecutive frames, recording is paused; if the proportion is greater than or equal to the preset proportion in the next frame, recording is resumed.

[0076] In this embodiment, through the motion detection mechanism described above, the megaphone automatically records video when movement occurs and automatically pauses when the scene is still. This ensures the complete recording of key content and avoids invalid images occupying storage space, effectively extending the battery life after a single charge and the usable time of the memory card.

[0077] S105: In response to the camera button being triggered, control the camera module to take a picture and save it to the memory card.

[0078] In this embodiment, when the user briefly presses the shutter button, the main control IC detects that the button has been triggered and then controls the camera module to take a single photo. The photo data is processed by the main control IC and stored in the memory card. In low-light environments, the user can press and hold the shutter button, and the main control IC will control the fill light to turn on to improve the brightness of the image. Pressing and holding the shutter button again will turn off the fill light.

[0079] S106: In response to the play button being triggered, play pre-stored audio or an audio file from the memory card.

[0080] In this embodiment, when the user inserts a memory card containing audio files into the memory card slot on the megaphone box and presses the play button, the main control IC reads the audio files from the memory card, amplifies them through the audio power amplifier circuit, and outputs them through the speaker. If there are multiple audio files on the memory card, the user can select and switch between files by pressing and holding the volume down or volume up button. Pressing the play button again stops playback.

[0081] S107: In response to the recording button being triggered, it captures audio signals through the microphone and stores them to the memory card.

[0082] In this embodiment, when the user briefly presses the record button, the main control IC detects that the button has been triggered, the indicator light illuminates, and the main control IC controls the audio amplification and acquisition circuit to start working. The microphone acquires the audio signal, processes it digitally, and stores it to the memory card. After recording is complete, the user briefly presses the record button again, and the main control IC stops recording and automatically saves the recording file. After recording is complete, the user can choose to press the play button, and the megaphone will start repeating the recorded audio. Pressing the play button again stops the playback.

[0083] It responds to a long press of the volume up or volume down button, allowing you to switch between multiple audio files on the memory card.

[0084] In response to the playback button being triggered, the file viewing interface is entered. Use the arrow keys to select and confirm the viewing of video, photo, or audio files stored on the memory card.

[0085] In one embodiment of this application, the megaphone control method further includes: In response to the strobe button being triggered, control the strobe light to perform alternating red and blue strobe or strong light strobe at a preset frequency; In response to the night vision button being triggered, the infrared night vision light is turned on, switching the camera module to night vision mode; In response to the whistle button being pressed and lasting for a duration greater than or equal to the third preset duration, the pre-stored whistle audio is played; in response to the whistle button being released, the whistle audio playback stops. When the alarm button is triggered, a pre-stored alarm audio is played; when the alarm button is triggered again, the alarm audio stops playing.

[0086] In this embodiment, when the user briefly presses the strobe button, the main control IC detects that the button has been triggered and then controls the strobe light circuit branch to drive the strobe light to work. The strobe light flashes alternately in red and blue or flashes with strong light at a preset frequency, emitting a warning signal. When the user briefly presses the strobe button again, the main control IC controls the strobe light to stop flashing, and the strobe function is turned off.

[0087] When a user presses and holds the night vision button in low light or complete darkness, the main control IC detects the button being triggered and immediately activates the infrared night vision constant current drive branch, turning on the infrared night vision lamp and emitting infrared light. Simultaneously, it switches the camera module to night vision mode, enabling the camera module to capture images in the absence of visible light, which are then displayed on the screen. When the user presses and holds the night vision button again, the main control IC turns off the infrared night vision lamp, and the camera module returns to normal shooting mode.

[0088] When the user presses the whistle button and holds it for a duration greater than or equal to the third preset time, the main control IC reads the whistle audio data pre-stored in the memory, amplifies it through the audio power amplifier circuit, and outputs it through the speaker to emit a whistle. When the user releases the whistle button, the main control IC immediately stops playing the whistle audio.

[0089] When the user briefly presses the alarm button, the main control IC reads the alarm audio data pre-stored in the memory, amplifies it through the audio power amplifier circuit, and outputs it through the speaker to emit an alarm sound. When the user briefly presses the alarm button again, the main control IC stops playing the alarm audio.

[0090] In one embodiment of this application, the megaphone control method further includes: In standby mode, if no operation command is received within a fourth preset time period, the display screen will automatically turn off or the microphone will automatically shut down. During recording, if the remaining capacity of the memory card is less than or equal to a preset capacity threshold, the oldest recorded data will be automatically deleted for loop recording.

[0091] In this embodiment, the megaphone enters standby mode after powering on, and the main control IC's built-in timer continuously monitors the user's operation status. When the megaphone does not receive any operation commands within a fourth preset time period in standby mode, the main control IC determines that the user has temporarily stopped using the device and then executes an energy-saving control strategy: first, it automatically turns off the display screen to reduce power consumption; when the standby inactivity period is further extended, the main control IC automatically cuts off the power supply to each functional module and controls the megaphone to automatically shut down. The user can press the power switch again to wake up the device. Through the above-mentioned automatic screen-off and automatic shutdown mechanisms, the power consumption of the megaphone in non-use mode is effectively reduced, and the battery life after a single charge is extended.

[0092] During recording, the main control IC continuously monitors the remaining capacity of the memory card. When the remaining capacity is less than or equal to a preset capacity threshold, the main control IC automatically retrieves the oldest recorded data from the memory card and deletes it, freeing up storage space for the current recording. This loop recording mechanism ensures that the megaphone will not interrupt recording due to a full memory card during long-term continuous recording scenarios. Recording data is continuously written to the memory card in segments, with the oldest data automatically overwritten by the newest data. Through this loop recording strategy, the megaphone can meet the continuous recording needs of long-duration duty scenarios without requiring the user to manually clear memory card space.

[0093] This application provides a control host, including a memory, a processor, and a computer program stored in the memory. The processor executes the computer program to implement the steps of the method provided in any optional embodiment of this application.

[0094] In one alternative embodiment, a control host is provided, such as Figure 5 As shown, Figure 5 The control host 300 shown includes a processor 301 and a memory 303. The processor 301 and the memory 303 are connected, for example, via a bus 302. Optionally, the control host 300 may also include a transceiver 304, which can be used for data interaction between the control host and other control hosts, such as sending and / or receiving data. It should be noted that in practical applications, the transceiver 304 is not limited to one, and the structure of the control host 300 does not constitute a limitation on the embodiments of this application.

[0095] Processor 301 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 301 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0096] Bus 302 may include a pathway for transmitting information between the aforementioned components. Bus 302 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 302 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0097] The memory 303 may be ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, or EEPROM (Electrically Erasable Programmable Read Only Memory), disk storage media, other magnetic storage devices, or any other medium that can be used to carry or store computer programs and can be read by a computer, without limitation herein.

[0098] The memory 303 is used to store computer programs that execute the embodiments of this application, and the execution is controlled by the processor 301. The processor 301 is used to execute the computer programs stored in the memory 303 to implement the steps shown in the foregoing method embodiments.

[0099] In an exemplary embodiment, a computer-readable storage medium is also provided, which stores at least one computer program that is loaded and executed by a processor of a computer device to enable the computer to implement any of the above-described dual-mode heat pump heating methods.

[0100] In one possible implementation, the aforementioned computer-readable storage medium can be a read-only memory (ROM), a random access memory (RAM), a solid-state drive (SSD), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc. The random access memory can include resistive random access memory (ReRAM) and dynamic random access memory (DRAM).

[0101] In other words, the data collection and processing in this application should strictly comply with the requirements of relevant national laws and regulations, obtain the informed consent or separate consent of the personal information subject, and carry out subsequent data use and processing within the scope of laws and regulations and the authorization of the personal information subject.

[0102] It should be further noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the above exemplary embodiments do not represent all implementation methods consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application.

[0103] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0104] Furthermore, the step numbers described herein are merely illustrative of one possible execution order between steps. In some other embodiments, the steps may not be executed in the order of their numbers, such as two steps with different numbers being executed simultaneously, or two steps with different numbers being executed in the reverse order of the illustration. This application does not limit this.

[0105] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. Optionally, the program is stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0106] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A megaphone, characterized in that, include: The housing includes a large tube (1), a medium tube (5) and a small tube (14), on which a loudspeaker (15) is mounted. The handle (9) is located at the rear end of the housing. The handle (9) is a hollow structure and a counterweight is provided inside it. A loudspeaker box (7) is installed on the housing, and the loudspeaker box (7) is equipped with a microphone and multiple function buttons; The control host (11) is located at the rear end of the housing, and the control host (11) contains a main control circuit board; A front-end functional component is disposed at the front end of the housing and detachably connected to the housing. The front-end functional component includes a lighting module (4) and a camera module (3). The small trumpet (14), the medium trumpet (5), and the large trumpet (1) are coaxially sleeved. The openings of the small trumpet (14) and the large trumpet (1) face forward, and the opening of the medium trumpet (5) faces backward. The emitting end of the small trumpet (14) faces the interior of the medium trumpet (5), and the emitting end of the medium trumpet (5) faces the interior of the large trumpet (1). The cross-sectional area of ​​the small trumpet (14), the medium trumpet (5), and the large trumpet (1) increases gradually along the sound wave propagation path. The sound wave emitted by the loudspeaker (15) is initially reflected and converged by the inner wall of the small trumpet (14) and then enters the interior of the medium trumpet (5). After being reflected by the inner wall of the medium trumpet (5) and changing its propagation direction, it enters the interior of the large trumpet (1) and then radiates outward after being reflected by the inner wall of the large trumpet (1) and changing its propagation direction.

2. The megaphone as described in claim 1, characterized in that, The handle (9) includes a first clamp and a second clamp that engage with each other; The joint surfaces of the first clamp and the second clamp adopt a flat tenon connection structure. The flat tenon connection structure includes a protruding male groove on the first clamp and a matching female groove on the second clamp. The inner wall of the female groove is coated with a sealant layer. When the male groove and the female groove are engaged and spliced, the sealant layer fills the gap between the male groove and the female groove, forming an integral sealing ring that fits the tenon connection structure.

3. The megaphone as described in claim 1, characterized in that, The front-end functional components are detachably connected to the housing via a spiral locking structure; The spiral locking structure includes an internal thread disposed on the inner side of the housing of the front functional component and an external thread disposed on the outer ring of the front end of the housing, wherein the internal thread and the external thread are engaged and screwed together. The spiral locking structure is also provided with a sealing gasket, which is located at the mating point of the internal thread and the external thread.

4. The megaphone as described in claim 1, characterized in that, The front-end functional components also include an infrared night vision light, a strobe light, and a fill light; The lighting module (4) is connected to the main control circuit board via an independent plug; The camera module (3) is connected to the main control circuit board via a video signal cable; The infrared night vision light, the strobe light, and the fill light share a common integrated cable connected to the main control circuit board.

5. The megaphone as described in claim 4, characterized in that, The integrated cable has a multi-core branch structure, which includes a first branch, a second branch, and a third branch. The main control circuit board is equipped with: The lighting drive circuit is connected to the independent plug of the lighting module (4); The camera decoding interface is connected to the video signal cable of the camera module (3); The infrared night vision constant current drive branch is connected to the first branch inside the integrated cable; The flash frequency lightning circuit branch is connected to the second branch inside the integrated cable; The fill light soft light control branch is connected to the third branch inside the integrated cable; An audio amplification and acquisition circuit is connected to the microphone.

6. The megaphone as described in claim 5, characterized in that, The function buttons on the loudspeaker box (7) include: The first button is used to control the on / off state of the lighting module (4); The second button is used to control the start and stop of the camera module (3); The third button is used to cycle through the functions of the integrated ribbon cable. A short press of the third button turns on the fill light, a long press triggers the infrared night vision light, and a double press activates the strobe light. Wherein, a short press is an operation with a press duration less than a first preset duration; a long press is an operation with a press duration greater than or equal to the first preset duration; and a double press is an operation with a time interval between any two presses less than a second preset duration.

7. The megaphone as described in claim 1, characterized in that, The control host (11) is equipped with a display screen (10), which is used to display the preview image captured by the camera module (3) in real time, as well as play back the stored video and photos; The control host (11) is also provided with a memory card slot for inserting an external memory card to store video, photo and audio data.

8. A method for controlling a megaphone, characterized in that, Performed by the control host of the megaphone according to any one of claims 1 to 7, comprising: In response to the power switch being triggered, the loudspeaker is powered on and enters standby mode; In response to the activation of the loudspeaker button, the loudspeaker amplification mode is started, and the microphone is controlled to collect audio signals and output them through the speaker. In response to the lighting button being triggered, control the lighting module to turn on or off; In response to the recording button being triggered, the camera module is controlled to start video recording and save it to the memory card; In response to the camera button being triggered, the camera module is controlled to take a picture and save it to the memory card; In response to the play button being pressed, play pre-stored audio or audio files from the memory card; In response to the recording button being triggered, audio signals are captured through the microphone and stored to the memory card.

9. The megaphone control method according to claim 8, characterized in that, Also includes: In response to the strobe button being triggered, control the strobe light to perform alternating red and blue strobe or strong light strobe at a preset frequency; In response to the night vision button being triggered, the infrared night vision light is turned on, switching the camera module to night vision mode; In response to the whistle button being pressed and lasting for a duration greater than or equal to a third preset duration, a pre-stored whistle audio is played; in response to the whistle button being released, the playback of the whistle audio stops. In response to the alarm button being triggered, a pre-stored alarm audio is played; in response to the alarm button being triggered again, the alarm audio is stopped playing.

10. The megaphone control method according to claim 8, characterized in that, Also includes: In standby mode, if no operation command is received within a fourth preset time period, the display screen will be automatically turned off or the loudspeaker will be automatically turned off. During recording, if the remaining capacity of the memory card is less than or equal to a preset capacity threshold, the oldest recorded data will be automatically deleted for loop recording.

Images