663results about "Screening casings" patented technology

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case has at least two access ports and at least one USB port. The portable power case is operable to supply power to an amplifier, a radio, a wearable battery, a mobile phone, and a tablet. The portable power case is operable to be charged using solar panels, vehicle batteries, AC adapters, non-rechargeable batteries, and generators. The portable power case provides for modularity that allows the user to disassemble and selectively remove the batteries installed within the portable power case housing.

The invention discloses an electrical cabinet with strong anti-electromagnetic interference capability, and relates to the technical field of electrical cabinets, the electrical cabinet comprises a cabinet body and further comprises a protection device, a sealing door slidably penetrates through the right side of the cabinet body, a moving hole is formed in the front side of the sealing door, and a limiting hole is formed in the front side of the sealing door. The protection device comprises an operation hole, an operation rod, a T-shaped rod, a protection rod, an L-shaped plate, a filter, a reset spring and a protection disc, the sealing door moves to enable the limiting hole to be aligned with the T-shaped rod, and after the T-shaped rod is aligned with the limiting hole, the T-shaped rod moves in the direction away from the protection rod under the elastic force effect of the reset spring; the T-shaped rod moves in the direction away from the protection rod to make contact with the inner wall of the limiting hole and restore limiting of the sealing door, the sealing performance of the cabinet body is kept through the L-shaped plate, the influence of external electromagnetic interference can be prevented, the equipment failure rate is reduced, and therefore the usability of the whole system is improved.

The invention relates to a composite electromagnetic shielding structure for a power terminal and a preparation method thereof, the structure comprises an accommodating shell, the accommodating shell is formed by connecting a plurality of composite electromagnetic shielding plates, and each composite electromagnetic shielding plate comprises an inner surface shielding layer and an outer surface shielding layer which are attached to each other; a heat conduction layer is arranged between the inner surface shielding layer and the outer surface shielding layer, and the inner surface shielding layer is located in the accommodating shell; a protective layer is arranged on the outer layer of the outer surface shielding layer and comprises an insulating layer and a waterproof layer, and the waterproof layer is located on the outer layer of the insulating layer; the outer surface shielding layer is made of a low-frequency electromagnetic field shielding material formed by mixing amorphous magnetic alloy powder, magnetic fibers and nickel powder; and the inner surface shielding layer is made of a high-frequency electromagnetic shielding material formed by mixing silicon carbide and resin foam rubber fibers. The structure can cope with various electromagnetic interference environments, provides electromagnetic shielding protection, and also has better electromagnetic shielding effectiveness for electromagnetic interference of different frequency bands.

The invention relates to the technical field of electric automobile motor controllers, in particular to an integrated efficient heat dissipation electric control shell, a motor controller and an electric drive assembly. Comprising a shell, a filtering assembly, a capacitor and a main function module, the shell comprises a first cavity and a second cavity, a partition is arranged between the two cavities, a cooling water tank is formed in the partition, and the two ends of the cooling water tank are connected with a cooling water channel inlet and a cooling water channel outlet respectively; a high-voltage input interface is arranged on the outer wall of the second cavity of the shell in a penetrating mode and connected with an external power supply battery pack. The filtering assembly is located in the second cavity of the shell and connected with the high-voltage input interface. The capacitor is installed in the second cavity of the shell and connected with the filtering assembly. The main function module is installed in the first cavity of the shell. The invention can solve the problems of complex assembly process, high cost, low heat dissipation efficiency, large circuit parasitic inductance and the like in the prior art, and has great popularization value.

The invention discloses an EMC filtering electromagnetic shielding structure which comprises a machine shell, a shielding wall, a top cover arranged on the machine shell, a filtering assembly and a main power assembly, the filtering assembly and the main power assembly are arranged in the machine shell, and a filtering cavity and a main power cavity which are separated by the shielding wall are arranged in the machine shell. The filtering assembly is arranged in the filtering cavity, the main power assembly is arranged in the main power cavity, and the shielding wall and the top cover are in metal connection with an electromagnetic shielding effect. The EMC filtering electromagnetic shielding structure has the advantage of being good in electromagnetic shielding effect. The invention further provides a vehicle-mounted charger adopting the EMC filtering electromagnetic shielding structure.

The terminal equipment comprises a shell, a circuit board, a heating device, an air duct, a heat dissipation piece and a fan device. The shell is provided with an air inlet hole and an air outlet hole. The circuit board is arranged in the shell, the heating device is arranged on the circuit board, the air duct is arranged between the shell and the circuit board, the air duct comprises an air inlet and an air outlet, the air inlet is communicated with the air inlet hole, and the air outlet is communicated with the air outlet hole. The heat dissipation piece is arranged in the air channel and close to the air outlet and used for receiving heat conducted by the heating device. The fan device is arranged at the position, close to the air inlet, in the air channel and used for guiding air flow to the heat dissipation piece so that heat of the heat dissipation piece can be dissipated to the outside of the shell through the air outlet and the air outlet holes in sequence through the air flow. According to the terminal equipment, the heat dissipation system comprising the heat dissipation piece, the fan device, the air duct and the like is arranged in the terminal equipment, active heat dissipation can be achieved, the purpose of efficiently cooling a heating device is achieved, and the terminal equipment can obtain good performance when running in a high-load scene.

A power feeding device that is connected to a Faraday cage containing a flight vehicle via a conductor and supplies lightning power generated from a lightning surge that has struck to a battery of the flight vehicle, and a ground line that connects the power feeding device and a ground surface are provided, the power feeding device includes a capacitor connected in series between the Faraday cage and the ground line, a lightning arrester connected in parallel to the capacitor, and a step-down converter that steps down a terminal voltage of the capacitor charged by the lightning surge to generate lightning power and supplies the generated lightning power to the battery.

The invention relates to a large-size double-layer splicing type ferrite magnetic shielding structure, in particular to a low-noise magnetic shielding barrel structure which is particularly suitable for an ultra-high sensitive magnetic field and inertial measurement device and miniaturization integration application of the ultra-high sensitive magnetic field and inertial measurement device. The magnetic shielding barrel is manufactured by splicing single large-size ferrite blocks into a double-layer cylinder. And the seam at the splicing part of the inner layer is blocked by the ferrite on the outer layer, so that the splicing does not generate large magnetic flux leakage. The double-layer configuration improves the shielding coefficient and reduces the magnetic noise at the same time. The novel large-size double-layer splicing type ferrite magnetic shielding structure shielding barrel is simple in processing technology, the shielding effect is not affected while the material cost is saved, the magnetic noise is reduced through the double-layer barrel structure, and the defect that the magnetic noise caused by a traditional single-layer ferrite magnetic shielding barrel cannot be further reduced is overcome.

The present application is applicable to the technical field of energy storage devices, and provides a combiner cabinet (100), a clamping circuit, and an energy storage system. The combiner cabinet comprises: a cabinet body (10); a first mounting cavity (20) used for accommodating a current interference source (50) and / or an electromagnetic interference source (60); a second mounting cavity (30) provided on one side of the first mounting cavity; and a third mounting cavity (40), wherein the third mounting cavity (40) and the first mounting cavity are respectively arranged on different sides of the second mounting cavity, and the third mounting cavity is used for accommodating a control module (70). According to the combiner cabinet provided by the present application, the first mounting cavity and the third mounting cavity are separated by means of the second mounting cavity, thereby reducing the interference formed by the current interference source and the electromagnetic interference source to the control module, and improving the stability of the combiner cabinet.

An electronic device is provided, the electronic device includes a primary device assembly and an extension assembly. The primary device assembly includes a first housing and a primary body circuit, the first housing has a first accommodation cavity, and the primary body circuit is disposed in the first accommodation cavity. The extension assembly includes a second housing and an extension circuit. The second housing has a second accommodation cavity, the extension circuit is disposed in the second accommodation cavity, and the extension circuit is signal-connected to the primary body circuit, to extend or enhance functionality of the primary device assembly.

The invention discloses terminal equipment, which comprises a display structure, a shielding structure and an antenna, and is characterized in that a second part of the shielding structure is arranged on the periphery of the side surface of the display structure, and the second part is arranged between a radiator and the side surface of the antenna, so that signal isolation is realized, and the absorption loss of the display structure to the antenna is reduced. According to the application, the miniaturization and large screen-to-body ratio of the terminal equipment can be realized, and the performance of the antenna can be ensured.

The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.

The invention provides a magnetic shielding unit hanging positioning and precision adjusting tool and an installation method. The magnetic shielding unit positioning tool comprises a sleeving shell matched with the outer contour of a base and provided with an opening in the lower portion. A guide channel is formed in the middle of the sleeving shell; a guide structure expanding outwards is formed at the inlet end of the guide channel, and a positioning closing opening for clamping a hook of the magnetic shielding unit is formed at the tail part of the guide structure; the parts, on the two sides of the guide channel, of the sleeving shell are connected. The magnetic shielding unit hanging precision adjusting tool comprises a sleeving frame which is matched with the outer contour of a base and provided with an opening in the lower portion. Two threaded driving units are symmetrically arranged in the middle of the sleeving frame, the axes of the two threaded driving units are parallel, and the ends of the two threaded driving units are oppositely arranged. And an adjusting space for accommodating a hook of the magnetic shielding unit is formed between the two threaded driving units. According to the scheme, rapid hanging mounting is achieved through a horn mouth type guide structure of the positioning tool, and the precision is guaranteed through fine adjustment of double screws of the adjusting tool.

The invention discloses a high-performance electromagnetic shielding and heat dissipation device and an application method, and relates to the technical field of electromagnetic shielding and heat dissipation, and the method comprises the steps: dividing a shielding body into a main shielding cavity and a shielding heat dissipation cavity through a partition plate; the main shielding cavity is internally provided with a sub-cavity, and the main shielding cavity and the sub-cavity are sealed by a double-layer cover plate; an optical fiber outlet shielding body and a second radio frequency through-wall connector are arranged on the main shielding cavity in a penetrating manner, the optical fiber outlet shielding body is in signal connection with the sub-cavity through an optical fiber MPO jumper wire and an optical fiber in sequence, and the second radio frequency through-wall connector is in signal connection with the sub-cavity through the first radio frequency through-wall connector; and the sub-cavities are connected through feed-through capacitors. According to the invention, high-performance electromagnetic shielding is carried out by adopting various methods, the electromagnetic interference of the digital device on the radio telescope is reduced, and the acquisition and processing board card can be ensured to directly acquire the radio frequency signal output by the receiver, so that the fidelity of signal acquisition and transmission is improved, meanwhile, the digital device is cooled, and the stable work of the device is ensured.

An enclosure to protect people and instruments from the effects of an electromagnetic pulse (EMP) is provided. The enclosure includes a floor assembly; walls extending upward on a first, second, third, and fourth side of the floor assembly; a roof; and a ceiling. On the interior of the enclosure, a shield layer is provided such that the enclosure forms a six-sided Faraday cage. Fasteners and other conductive securement materials such as copper tape help achieve the conductivity of the shield layer. Extending through the walls of the enclosure may be secure points of entry allowing for people, air, and conductors to securely enter and exit the enclosure. The enclosure contains a grounding system to assist with protecting the contents of the enclosure from the effects of the EMP.

The present invention relates to the field of borehole radar, and in particular to a directional borehole radar shielding chamber and a method for using the same. The directional borehole radar shielding chamber comprises a main body, a resistor connection part, a radiation surface support part and a transmitter (receiver) installation part. The main body is a semi-cylindrical shell; the resistor connection part is located at the two ends of the main body, and is used to connect the impedance matching resistor; the radiation surface support part is an arc beam structure, on which an arc-shaped card slot is provided, which is used to support and fix the arc-shaped butterfly-shaped radiation surface; the transmitter (receiver) installation part is located in the middle of the main body, and is used to fix the transmitter (receiver). The shielding chamber is an integrated structure, made of a plastic material with a low density, and a layer of conductive metal paint is sprayed on its outer surface. The shielding chamber takes into account both the shielding function and the lightweight performance, and the overall mass distribution is more uniform. The rotational movement speed is more stable during horizontal detection, and the card slot type supporting structure not only ensures the radial support of the arc-shaped butterfly-shaped radiation surface, but also avoids its circumferential shaking.

The invention discloses a geomagnetic interference shielding device and a use method, the device comprises a shielding shell, a shielding end cover, a PLC controller, a vector magnetic sensor and a magnetic field compensation device, the shielding shell is a hollow cuboid with an opening at one side, the shielding end cover is connected to the opening of the shielding shell to form a closed anti-interference shielding box body, and the PLC controller is connected with the vector magnetic sensor. An electric device fixing device is arranged in the box body and is used for fixing an electric device and shielding external geomagnetic interference; the PLC, the vector magnetic sensor and the magnetic field compensation device are respectively arranged on the outer wall of the shielding shell; the output end of the vector magnetic sensor is connected with the PLC, the output end of the PLC is connected with the magnetic field compensation device, and the PLC is used for controlling the magnetic field compensation device to generate a magnetic field, so that the geomagnetic field is shielded. According to the invention, the detected geomagnetic field in the environment can be offset, and the geomagnetic field is shielded while the signal receiving of the electric device is not influenced, so that the influence of the geomagnetic field on the work of the electric device is avoided.

The invention discloses a fireproof low-magnetism freight magnetic shielding door with a large magnetic shielding space. The fireproof low-magnetism freight magnetic shielding door comprises a door leaf; the door frame is mounted inside the portal frame; the locking mechanism assists in opening and closing the door leaf; wherein the door leaf is in butt joint with the door frame to form a magnetic shielding continuous structure; wherein the door leaf and the door frame are fixed and released through a locking mechanism; a sliding rail mechanism is arranged on the door leaf and matched with the door frame to achieve opening and closing. The door leaf and the door frame are each of a multi-layer composite structure which comprises a fireproof plate, a magnetic shielding layer and a copper layer, the multiple functions of fire prevention, magnetic shielding and electromagnetic shielding are achieved, and the overall performance and the space utilization rate are improved. And when the permalloy is prevented from being excessively pressed, the butt joint precision is improved, the magnetic leakage at the door slot is reduced, and the opening force is low while the high magnetic shielding effect is achieved.

The invention discloses a detection device for silver-copper alloy contact manufacturing, and relates to the technical field of switch manufacturing, the detection device comprises a supporting seat, a guide sliding table is fixedly connected to the upper position of the inner side face of the supporting seat, and the output end of the guide sliding table is fixedly connected with a fixing plate. According to the detection device for silver-copper alloy contact manufacturing, a positioning assembly penetrates through a gap to push the middle positions of the surfaces of a plurality of silver-copper alloy contacts, so that the silver-copper alloy contacts are pressed and covered on the inner side surfaces of the positioning assembly and a limiting assembly; at the moment, the two contact ends of the silver-copper alloy contacts face the bottom of the positioning assembly and the top of the limiting assembly respectively, after the silver-copper alloy contacts are limited, the guide sliding table drives the fixing plate to move, so that the multi-position clamping assembly integrally moves into the protection mechanism, and the protection mechanism sequentially detects the resistors at the two ends of the multiple copper alloy contacts. The problems that products are small, irregular in appearance, inconvenient to take manually and low in measurement efficiency are solved.

The application relates to the technical field of high-voltage switch cabinets, in particular to a high-voltage switch cabinet convenient to maintain, which comprises a cabinet body and a cabinet door arranged on the cabinet body, a through hole extending along the arrangement direction of the cabinet door and the cabinet body is arranged on the cabinet door, an observation window, a shielding plate with mesh holes and a shielding net are arranged on the cabinet door, the mesh holes of the shielding plate and the shielding net are different in size, the observation window, the shielding net and the shielding plate are sequentially arranged along the arrangement direction of the cabinet door and the cabinet body, and the observation window, the shielding plate and the shielding net are all located on the surface of the cabinet door close to the cabinet body and cover the through hole. The shielding plate with mesh holes and the shielding net are arranged to form a multilayer electromagnetic shielding structure, the shielding plate and the shielding net can filter electromagnetic interference of different frequencies in a synergistic manner, and the electromagnetic compatibility is significantly improved.

The invention belongs to the technical field of inverters, and discloses a high-performance marine inverter power supply which comprises a sealed shell and an integrated circuit assembly, the sealed shell has magnetic conductivity, and the integrated circuit assembly is arranged in an installation cavity. Therefore, the closed shell can effectively shield radiation-proof electromagnetic interference generated by the high-frequency signal switch in the closed shell to the outside, so that the inverter power supply has better electromagnetic compatibility. The integrated circuit assembly comprises a boost power board, a boost inductance board, an energy storage capacitor board, an extended energy storage capacitor board, an inversion power board, a three-phase output filtering inductance board and an EMC filtering board, the boost power board and the boost inductance board form a boost circuit, the inversion power board, the three-phase output filtering inductance board and the EMC filtering board form an inversion circuit, the extended energy storage capacitor board is electrically connected with the energy storage capacitor board, and the EMC filtering board is electrically connected with the boost circuit. The expansion energy storage capacitor plate is provided with a plurality of electrolytic capacitors which are connected in parallel, so that the electrolytic capacitors can select smaller models, and the electric power impact resistance of the inverter power supply is improved.

The invention discloses an EMC filtering electromagnetic shielding structure which comprises a metal casing, a shielding wall integrally formed with the casing, a cover plate arranged on the casing, a filtering assembly and a main power assembly, the filtering assembly and the main power assembly are arranged in the casing, and a filtering cavity and a main power cavity which are separated by the shielding wall are arranged in the casing. The filtering assembly is arranged in the filtering cavity, the main power assembly is arranged in the main power cavity, and the shielding wall is in interference contact connection with the cover plate. The EMC filtering electromagnetic shielding structure has the advantages of being good in electromagnetic shielding effect and low in cost. The invention further provides a vehicle-mounted charger adopting the EMC filtering electromagnetic shielding structure.

The invention discloses a radiation shielding case for charging equipment of an automobile battery swap station, and belongs to the technical field of radiation shielding cases, the radiation shielding case comprises a bottom plate, the upper surface of the bottom plate is in bolted connection with a battery swap station, the upper surface of the bottom plate is in welded connection with a vertical plate, and the upper surface of the bottom plate is in bolted connection with a motor; the device further comprises a rotating shaft, the rotating shaft is rotationally arranged in the vertical plate, and the tail end of the rotating shaft is fixedly connected with a fan. According to the radiation shielding cover for the charging equipment of the automobile battery swap station, at the beginning, the long pin is located at the position close to the connecting shaft, an operator can conveniently and rapidly change the battery through the battery bin, after battery changing, the motor is started and drives the threaded rod to rotate, at the moment, the long pin moves in the vertical direction under the action of the long plate and the limiting column, and when the long pin descends, the long pin moves in the vertical direction. When the shielding case is unfolded, the shielding case body on the surface of the connecting shaft is pulled open, even if the shielding case body is unfolded, the long pin moves to the lower side of the vertical plate finally, the shielding case body is completely unfolded, and the anti-radiation purpose is achieved.

The embodiment of the invention provides an electromagnetic shielding cover, which is arranged on a first side surface of a base station module, is perpendicular to a top surface of the base station module, and extends out along a direction perpendicular to the top surface of the base station module. The height of the electromagnetic shielding cover is higher than the thickness of the base station module by a first height, energy radiated by the base station module comprises energy of a front-view upper side lobe, and the electromagnetic shielding cover is used for shielding the energy of the front-view upper side lobe. According to the embodiment, the electromagnetic shielding cover is arranged on the first side face of the base station module, is perpendicular to the top face of the base station module and extends out in the direction perpendicular to the top face of the base station module, and due to the fact that the electromagnetic shielding cover is higher than the base station module, energy of a front-view side lobe of the base station module can be shielded.

The invention relates to the field of drilling radars, in particular to a directional drilling radar shielding bin and a using method thereof. The directional drilling radar shielding bin comprises a main body part, a resistor connecting part, a radiating surface supporting part and a transmitting (receiving) machine mounting part. The main body part is a semi-cylindrical shell; the resistor connecting parts are positioned at two side end parts of the main body part and are used for connecting impedance matching resistors; the radiation surface supporting part is of an arc beam structure, and an arc-shaped clamping groove is formed in the radiation surface supporting part and used for bearing and fixing the arc-shaped butterfly-shaped radiation surface. And the transmitting (receiving) machine mounting part is positioned in the middle of the main body part and is used for fixing a transmitting (receiving) machine. The shielding bin is of an integrated structure and is made of a plastic material with small density, and a layer of conductive metal paint is sprayed on the outer surface of the shielding bin. The shielding bin has the shielding function and the light weight performance, the overall mass distribution is more uniform, the rotating movement speed is more stable during horizontal detection, and the clamping groove type supporting structure guarantees radial supporting of the arc-shaped butterfly-shaped radiating surface and avoids circumferential shaking of the arc-shaped butterfly-shaped radiating surface.

A power supply instrument with a protection structure disclosed by the present invention comprises a power supply instrument body, a protection mechanism is installed on the outer side of the power supply instrument body, the protection mechanism comprises a protection shell, a heat dissipation assembly is installed in the protection shell, a dustproof assembly is installed on the protection shell on the outer side of the heat dissipation assembly, and clamping assemblies are installed on the left side and the right side in the protection shell. The power supply instrument body is arranged between the clamping assemblies on the left side and the right side, the protective shell is provided with supporting sliding assemblies on the two sides of the bottom of the power supply instrument body, the protective shell is provided with a moisture-proof box on the top of the power supply instrument body, a plurality of through holes are formed in the two sides of the moisture-proof box, the moisture-proof box is filled with moisture-proof agents, and assembling frames are installed on the two sides of the protective shell. A cover plate is slidably mounted between the two side assembly frames, and a transparent plate is mounted on the cover plate at a position corresponding to the power supply instrument body.

The invention discloses a high-frequency water hammer pressure wave monitor suitable for fracturing, and relates to the technical field of water hammer pressure monitoring, the high-frequency water hammer pressure wave monitor comprises a shell, and the inner wall of the shell is sequentially provided with a buffer pad, a communication power supply module, a data acquisition and processing module, a signal adjusting and filtering module and a pressure detection module from top to bottom; a filter screen is fixedly connected to the lower side of the inner wall of the shell, and a vibration sensing module and a temperature collecting module are arranged between the pressure detection module and the signal adjusting and filtering module. By arranging the pressure detection module, the signal adjusting and filtering module, the data acquisition and processing module, the communication power supply module, the buffer pad, the vibration sensing module and the temperature acquisition module, a complete pressure acquisition, signal conditioning, data processing and transmission system is constructed, and the system has anti-seismic compensation and temperature correction functions; the system improves the monitoring precision and the system stability, is high in practicality, and is suitable for the real-time monitoring demands under the working condition of high-frequency water attack.

The invention relates to a motor controller, and belongs to the field of electric vehicle manufacturing. Comprising a motor control device which comprises a capacitor, a high-voltage input connector and a shielding magnetic ring; a containing cavity is formed in the motor controller shell, and the capacitor is installed in the containing cavity; the top of the installation box is communicated with the containing cavity, an installation opening is formed in the bottom of the installation box, the high-voltage input connector is connected to the bottom of the installation box, the shielding magnetic ring is installed in the installation box, and the shielding magnetic ring and the high-voltage input connector are connected through the installation opening. Under the condition that the capacity of the motor controller shell is limited, the layout and the installation mode of each component are optimized, the space is expanded from the bottom of the motor controller shell, and the shielding magnetic ring is installed, so that the size of the motor controller shell is reduced, and the assembly space utilization rate in an electric automobile is improved.

This application discloses a housing, a vibration assembly, and a vehicle including the vibration assembly. The housing includes a polymer layer and a metal layer. The metal layer is located at the innermost layer of the housing and is made of a metallic material. The polymer layer is located at the outermost layer of the metal layer and is made of a polymer material. The housing provided by this application can convert mechanical vibration energy into heat energy for dissipation, thereby achieving noise reduction.