24results about How to "Avoid howling" patented technology

A low-howling microphone relates to the technical field of audio instruments and comprises a shell and a sound pick-up, a first sound insulation plate and a second sound insulation plate are arranged in an inner cavity of the shell, the inner cavity of the shell is divided into three cavities by the first sound insulation plate and the second sound insulation plate, and the three cavities are a sound pick-up cavity, a first tuning cavity and a second tuning cavity respectively. Wherein the pickup cavity and the first tuning cavity are separated by a first sound insulation plate, and the first tuning cavity and the second tuning cavity are separated by a second sound insulation plate; the pickup is mounted in the pickup cavity, and a pickup hole is formed in the bottom of the pickup cavity; a first tuning hole is formed in the first sound insulation plate, first tuning paper is arranged on the first sound insulation plate, and the first tuning hole is covered with the first tuning paper; a plurality of second tuning holes are formed in the second sound insulation plate, a plurality of pieces of second tuning paper are arranged on the second sound insulation plate, and the second tuning holes are covered with the second tuning paper respectively.

The present invention discloses a vibration-controlled current-stabilizing inductor, which specifically relates to the technical field of inductors, including a base, a skeleton is arranged above the base, a magnetic core is arranged inside the skeleton, a coil is wound around the outside of the skeleton, two pins of the coil are led out from the bottom of the base, and a shielding cover is arranged outside the base. The present invention, through the arrangement of an internal vibration-proof component, on the one hand, limits the coil in the radial and axial directions by pushing a clamping plate and a pressure plate, thereby ensuring the stability of the coil structure, avoiding problems affecting the mechanical strength and vibration resistance of the inductor, and improving the stability of the current when the inductor is working. On the other hand, the air in the limiting cavity and the shielding cover can also play the role of a gas spring after the limiting is completed, which can have a buffering effect, further reducing the vibration of the coil, thereby avoiding the inductor from whistling during operation, helping to maintain the stability and performance of the circuit, and improving the service life of the inductor, and can be suitable for more applications.

The utility model relates to the technical field of electronic cigarettes, in particular to a left-right split bullet-changing electronic cigarette microphone airway structure. The electronic cigarette with the structure comprises a cigarette cartridge, a cigarette rod, a cigarette cartridge cover plate, a cigarette rod cover plate and a magnet, a cigarette cartridge cover plate is arranged on the right side of the cigarette cartridge; the cigarette cartridge cover plate and the cigarette rod cover plate are attracted through the magnet. The earphone also comprises a support, a gas adjusting switch, gas sealing silica gel and microphone silica gel. A bracket is arranged at the bottom of the cartridge; an opening is formed in the bracket; a gas adjusting switch is arranged on the opening; the smoke cartridge cover plate deviating from the opening position of the support is fixedly provided with gas sealing silica gel, and the microphone silica gel is fixed to the corresponding position of the cigarette rod cover plate. According to the utility model, the problems of microphone corrosion and whistling are solved. The method can be applied to the airway structure of the electronic cigarette.

The present application relates to the technical field of steam humidifier, and discloses a noise reduction structure of steam humidifier convenient to install and a use method, the noise reduction structure of steam humidifier convenient to install, including installation ring, both sides of the installation ring are fixedly connected with lower side plate, the inside of the lower side plate is provided with clamping groove, the side of the installation ring is hingedly connected with upper cover, both sides of the upper cover are fixedly connected with upper side plate, the opposite side of two installation plates is fixedly connected with support rod, the outer wall of the support rod is symmetrically slidably connected with sliding block, the opposite side of two sliding blocks is fixedly connected with spring one, the outer wall of the sliding block is slidably connected in the sliding groove, and the bottom of the sliding block is fixedly connected with clamping block.Under the reaction force of spring one, the sliding block is away from each other along the support rod, drives the clamping block to be away from each other and is clamped in the clamping groove, without using a variety of tools, and the installation of the upper cover can be completed only by simple operation.

The invention relates to the technical field of teaching equipment, in particular to a classroom sound amplification device. The classroom sound amplifying device comprises a sound receiving mechanism which is movably arranged in a classroom, and the sound receiving mechanism is connected with a sound box in the classroom so as to transmit received sound to the sound box for playing; the control mechanism is connected with the sound receiving mechanism to drive the sound receiving mechanism to move, the control mechanism is in signal connection with a positioning unit carried by a teacher, and the control mechanism controls the sound receiving mechanism to move by receiving a signal of the positioning unit, so that the distance between the sound receiving mechanism and the teacher is a set distance. The sound receiving mechanism receives sound of a teacher and then transmits the sound to the sound boxes in the classroom for playing, the problem that the sound amplification effect of sound amplification equipment is poor is effectively avoided, the teacher carries the positioning unit, so that the control mechanism receives signals to control the sound receiving mechanism to move, the sound receiving mechanism can receive sound no matter where the teacher teaches, and the teaching efficiency is improved. And the sound amplification effect is ensured.

The application provides an acoustic echo cancellation method and a Bluetooth intercom system, and is applied to a slave device in the Bluetooth intercom system. The method comprises the following steps: sending first voice data to a master device according to a current voice frame collected, wherein the first voice data comprises a voice identifier corresponding to the current voice frame, a device identifier of the slave device and encoded voice of the current voice frame; storing the current voice frame and the voice identifier corresponding to the current voice frame as local data in a local cache area; receiving second voice data sent by the master device, wherein the second voice data comprises a voice identifier associated with the device identifier of each slave device and encoded voice of multi-path combination; performing acoustic echo cancellation processing on the encoded voice of multi-path combination in the second voice data according to the second voice data and the local data, obtaining processed voice, and playing the processed voice, so as to improve the acoustic echo cancellation processing effect.

This utility model discloses a silent valve structure and a food processing device for steam release noise reduction, relating to the field of noise reduction technology for household appliances. It includes a valve body comprising an upper opening, a silent cavity, and a lower opening. The bottom surface of the silent cavity is concave upwards or downwards, forming a first deflection section; the top surface of the silent cavity is concave upwards or downwards, forming a second deflection section. The first deflection section has an opening on its side, namely the lower opening; the second deflection section has an opening on its side, namely the upper opening. The valve body is mounted on the upper surface of a heating container, with the lower opening located within the inner cavity of the heating container. The upper opening is directly or indirectly exposed to the environment. A steam release channel is formed between the lower opening, the silent cavity, and the upper opening. Steam enters the silent cavity laterally from the lower opening and is released laterally into the environment from the upper opening. Through the two deflection sections and the lateral openings, steam cannot rush straight upwards, reducing the steam flow rate and thus reducing the noise generated by steam emission.

The utility model relates to an anti-howling loudspeaker, which comprises a loudspeaker main body and a hanging piece, and the hanging piece is detachably arranged on the loudspeaker main body. The hanging piece comprises a chuck and a connecting column, the connecting column is fixed on the chuck and located between the chuck and the loudspeaker main body, and a clamping groove is formed between the chuck and the loudspeaker main body; a first magnetic block is arranged at the end, close to the loudspeaker body, of the connecting column, a second magnetic block is arranged on the loudspeaker body, and the first magnetic block and the second magnetic block can attract each other. Through the design of the chuck and the connecting column, the loudspeaker main body and the body of a user can be separated through the connecting column, and a certain space is reserved between the loudspeaker main body and the body of the user, so that possible reflection and resonance effects of the surface of the body on sound are reduced; therefore, the problem that the loudspeaker main body generates howling during use is avoided to the greatest extent.

The one-way valve comprises a valve body, a piston assembly and an isolation piece, an air inlet channel, a valve cavity and an air outlet channel are formed in the valve body, and the air inlet channel communicates with the air outlet channel through the valve cavity; the piston assembly is arranged in the area where the valve cavity is located, the piston assembly comprises a sealing piece and a spring, the spring is assembled between the sealing piece and the valve body in a pre-compression mode, and the sealing piece can block the air inlet channel under pushing of the spring; and at least part of the isolation piece is arranged on the spring in a sleeving mode, a connecting channel is formed between the isolation piece and the cavity wall of the valve cavity, and the isolation piece can isolate gas conducted in the connecting channel from the spring and is used for limiting the spring from shaking under the action of airflow. According to the one-way valve, at least part of gas conducted in the valve cavity is isolated from the spring through the isolation piece, so that the spring can be limited from shaking under the action of airflow, whistling can be avoided when the one-way valve works, and the function of improving the product performance is achieved.

The application provides an air conditioner box air door structure capable of preventing howling and abnormal sound, comprising an air door shaft and an air door plate arranged on the air door shaft, the air door plate is integrally formed with the air door shaft, and a soft rubber sleeve is arranged on the air door plate; a plurality of equidistantly arranged trapezoidal blocks are arranged on the soft rubber sleeve, the trapezoidal blocks are made of the same material as the soft rubber sleeve, and the trapezoidal blocks are integrally formed with the soft rubber sleeve. The air conditioner box air door structure capable of preventing howling and abnormal sound can guide the air flow during the closing of the air door, so that the howling is avoided, the air door can be buffered when the air door is closed, the impact sound of the air door is avoided, and the user comfort is improved.

The utility model discloses an electric guitar with a built-in sound box, which relates to the technical field of electronic musical instruments and comprises a guitar box body, a sound box body, a battery and a control circuit board are arranged in the guitar box body, the sound box body is electrically connected with the control circuit board, and the guitar box body comprises a guitar panel and a guitar rear shell. A sound pickup is arranged on the guitar panel, an installation bottom plate is arranged in the guitar rear shell, the battery, the sound box body and the control circuit board are all installed on the installation bottom plate, a plurality of damping parts are arranged on the outer side edge of the sound box body, and the sound box body is connected with the installation bottom plate through the damping parts. According to the utility model, the sound box body is embedded in the guitar box body, so that the overall space design is reasonable, the sound box body is not easy to damage, and the sound box body is provided with the damping member, so that the sound box body can be prevented from colliding with the guitar box body, the generation of abnormal sound can be effectively avoided, the vibration of the sound box body is reduced, and squeal caused by string resonance is prevented. The sound quality effect is good.

The invention discloses a multi-channel video matrix switching system based on FPGA, which belongs to the technical field of audio and video switching, and specifically comprises: receiving multi-channel audio and video stream input signals through a GT interface and decoding them to obtain n-channel video stream data and n-channel audio stream data; obtaining and parsing the audio and video input signal switching instruction to obtain a target video signal and a target audio signal, determining an input signal group according to the target video signal and the target audio signal, and switching the multi-channel input signals in the input signal group to the same interface; packaging the multi-channel input signals in any input signal group and sending them to the corresponding interface. The invention realizes the simultaneous processing of the switching of multi-channel high-definition audio and video streams under limited hardware resources, and ensures that there is no delay interference between signals and controls the delay of picture switching within one scanning line, thereby bringing a better user experience.

The present disclosure provides a control method and device for earphones, earphones and a medium. The earphones include a shell and an infrared sensor arranged on the shell. The method includes: when the earphones are worn, detecting whether a human hand presses the shell by using the infrared sensor; when it is detected that a human hand presses the shell, reducing the feedback noise reduction intensity of the earphones or turning off the feedback noise reduction function of the earphones to prevent the earphones from generating howling.

The utility model provides a back door sealing device and a vehicle, a gap is formed between a back door and a ceiling, the back door sealing device comprises a sealing assembly, the sealing assembly is arranged on the inner side of the back door and can be matched with the ceiling in an abutting mode, and therefore sealing is formed between the back door and the ceiling; the driving assembly is connected with the sealing assembly and used for driving the sealing assembly to be close to or away from one side of the ceiling. Therefore, the sealing assembly is arranged at the gap between the back door and the ceiling in a position-adjustable mode, sealing can be formed between the back door and the ceiling by abutting and matching the sealing piece and the ceiling, whistling and howling caused by air flow formed at the gap between the back door and the ceiling due to internal and external pressure difference are prevented, and the NVH performance of a vehicle is improved. Meanwhile, when the back door of the vehicle needs to be opened, the sealing assembly can be retracted to prevent interference between the sealing assembly and the ceiling.

The invention relates to a parameter self-adjustment method and device, equipment and a storage medium. The method comprises the steps that mechanical open-loop characteristic parameters obtained after a first preset sweep frequency signal is injected into the drive control system are obtained, and the first preset sweep frequency signal is an incomplete open-loop sweep frequency signal; based on the mechanical open-loop characteristic parameter, obtaining an amplitude-frequency characteristic of the driving control system; and adjusting controller parameters of the driving control system based on the amplitude-frequency characteristics. According to the invention, the parameter adjustment time can be shortened and the accuracy of controller parameter adjustment can be improved.

The utility model discloses a vehicle-mounted sound card box and a vehicle test system. The vehicle-mounted sound card box comprises a housing; the MIC is arranged in the shell, at least part of the MIC is exposed out of the shell, and the MIC is used for collecting sound; the loudspeaker is arranged in the shell, at least part of the loudspeaker is exposed out of the shell, and the loudspeaker is used for playing sound; the PCBA board is arranged in the shell, the PCBA board is in interactive connection with the MIC, the output end of the PCBA board is connected to the controlled end of the loudspeaker, and the PCBA board is suitable for being connected with a computer or a cabin controller through a PCBA board connecting line; and the sound insulation assembly is arranged between the MIC and the loudspeaker. In the process of sound acquisition, transmission and broadcasting, the sound insulation assembly is arranged between the MIC and the loudspeaker, so that electromagnetic interference between the MIC and the loudspeaker can be avoided, noise is reduced, current sound is avoided, sound quality is clearer, and howling can be avoided.

The invention provides a food processor which comprises a main machine, a cup body, a heating disc arranged at the bottom of the cup body and a permanent magnet brushless motor arranged on the lower portion of the cup body, the cup body comprises a cup body and the heating disc, and a smashing cutter driven by the permanent magnet brushless motor is arranged in the cup body. The permanent magnet brushless motor comprises a lower end cover and a driving assembly arranged between the lower end cover and the heating disc, the heating disc further comprises an upper end cover which extends in the direction away from the cup body and is correspondingly assembled with the lower end cover, and an end plate of the upper end cover is formed on the bottom wall of the heating disc. A mounting cavity for containing a driving assembly is formed between the upper end cover and the lower end cover and comprises an upper end cover air inlet which is formed in the side portion of the upper end cover and focuses air into the mounting cavity and a lower end cover air outlet which is formed in the side portion of the lower end cover and focuses air out of the mounting cavity. The problem that the heat dissipation efficiency is affected due to the fact that air enters the motor from the air inlet, gathers and cannot be quickly discharged is solved.

The utility model discloses a pickup special for a seven-stringed plucked instrument, and belongs to the technical field of musical instruments. In order to realize interference-free sound amplification and avoid squeal, the sound pickup comprises a shell, a miniature capacitor pickup head is embedded in the shell, one side of the shell is provided with a through hole and a lead wire, the lead wire is used for penetrating through the miniature capacitor pickup head, and an end cover is arranged at the upper end of the shell and is used for completely sealing the shell. The inner wall of the housing 1 is provided with a conductive silver paint layer, and the conductive silver paint layer is connected with the ground wire end of the miniature capacitor pickup head 2 and is used for shielding electromagnetic interference.

The utility model discloses an air-cooled motor heat radiation diversion structure, comprising a motor shell cylinder and a stator, the motor shell cylinder is cylindrical, the stator is arranged in the motor shell cylinder, the inner wall of the motor shell cylinder is provided with a plurality of support strips, the support strips support the outer peripheral surface of the stator, so that the stator and the motor shell cylinder are kept coaxial, and the stator and the motor shell cylinder are coaxial. The supporting strips divide the gap between the stator and the motor shell cylinder into a plurality of airflow channels, air sucked from one end of the motor shell cylinder passes through the airflow channels and then is blown out from the other end, and the motor shell cylinder and the stator are cooled. According to the utility model, the cooling airflow channel is arranged between the motor shell and the stator, and a special flow guide structure is adopted, so that wind noise is reduced, and the overall heat dissipation capability of the motor is improved.

A vibration loudspeaker relates to the technical field of audio instruments and comprises a shell and a loudspeaker body, the shell is formed by jointing an upper half shell and a lower half shell, the upper half shell is provided with a plurality of pressure relief through holes, the lower half shell is provided with a plurality of tuning holes, and the lower half shell is provided with at least one piece of first tuning paper; the first tuning paper covers the tuning holes respectively; a fixed elastic piece is arranged in the shell, second tuning paper is attached to the upper surface of the fixed elastic piece, the fixed elastic piece divides an inner cavity of the shell into two cavities, one cavity is defined by the fixed elastic piece and the lower half shell and is a tuning cavity, and the other cavity is defined by the fixed elastic piece and the upper half shell and is a pressure relief cavity; the loudspeaker body is fixed at the lower end of the fixing elastic piece, a vibrating plate is arranged on the loudspeaker body, the fixing elastic piece and the second tuning paper are provided with via holes for the vibrating plate to penetrate through, and the vibrating plate penetrates through the via holes in the fixing elastic piece and the second tuning paper and then is fixedly connected with the upper half shell.

The utility model relates to the technical field of electric appliances, in particular to a four-way connector, a drainage system, cleaning equipment and a cleaning system. The four-way connector comprises a main pipe, a first branch pipe and a second branch pipe. The main pipe comprises a first pipe opening, a second pipe opening and a third pipe opening, a separation part is arranged in the main pipe, and the first pipe opening and the third pipe opening are separated by the separation part; the first branch pipe is connected to the main pipe and is communicated with the third pipe orifice; the second branch pipe is connected to the main pipe and communicated with the third pipe opening. According to the technical scheme, the connecting structure of the pipeline system in the cleaning equipment is optimized, and the structural rationality of the cleaning equipment is improved.

The invention belongs to the technical field of power transmission, and discloses a transmission mechanism which is characterized in that at least one first screw channel arranged in the rotating circumferential direction is arranged in a first annular raceway, and at least one second screw channel arranged in the rotating circumferential direction is arranged in a second annular raceway; the rotor is clamped between the first annular roller path and the second annular roller path, the rotor is connected to the base body in a stopping and limiting mode in the circumferential direction of the first axis, the rotor has the rotational freedom degree along the axis of the rotor relative to the base body, and the transmission part is matched with the first screw path and the second screw path; when at least one of the first transmission part and the second transmission part rotates relative to the base body, the other transmission part is driven by the rotor to rotate. According to the invention, the meshing backlash caused by tooth-shaped transmission can be avoided, and the power transmission efficiency and stability are effectively improved. The invention further discloses a transmission assembly, a vehicle and a robot.

The utility model relates to an air duct assembly, an air conditioner indoor unit and an air conditioner unit, and the air duct assembly comprises a shell, a first opening is formed in the middle area in the first direction; the two centrifugal fans are arranged at the two ends in the shell in the first direction respectively, each centrifugal fan comprises a centrifugal fan blade, the central axis of each centrifugal fan blade is consistent with the first direction, and a fan inlet is formed in the end, along the central axis, of each centrifugal fan; the water receiving component is installed in the shell through the first opening, the water receiving component is of a cylindrical structure and extends in the first direction, the water receiving component is connected between the two centrifugal fans, flow collecting openings are formed in the two ends of the water receiving component and communicate with fan inlets in the same side, a second opening is formed in the side wall, close to the first opening, of the water receiving component in the second direction, and the second opening communicates with the fan inlets in the second direction. The second direction is perpendicular to the first direction; and the heat exchanger is arranged in the second opening and seals the second opening.