186results about How to "Increase headroom" patented technology

A gain control circuit adjusts the signal level of a received signal responsive to the bandwidth a received signal and / or the delay spread of the channel in which the signal has propagated. The bandwidth and delay spread are evaluated to estimate the amount of signal variation that is expected due to fast fading. Adjustments to the signal level are then made to avoid clipping while at the same time ensuring that the dynamic range of a receiver component is efficiently utilized.

A monolithic integrated circuit amplifier has a gain stage and a buffer stage. The buffer stage includes an output stage and two separate voltage supplies, the second of which has a greater magnitude than the first. Switching circuitry is included that is connected to the output stage via a regulator bus. When an output demand voltage is less than a switch-over threshold, current to the output stage is provided substantially from the first voltage supply; when the output demand voltage is greater than the switch-over threshold, current to the output stage is provided substantially from the second voltage supply. Collector voltage at the output stage is dynamically controlled to be greater than the emitter voltage by a difference voltage that increases proportionally as output voltage increases above the switch-over threshold. This difference voltage is commonly referred to as "headroom." The dynamic headroom control circuitry preferably includes means for predictably setting and controlling the headroom voltage at switch-over and smoothly increasing the headroom voltage up to maximum output voltage.

Devices and methods to reduce ear wax clogging of acoustic ports, hearing aid systems, and feedback reduction systems are provided. A conformal hearing aid includes a hearing aid body, where the hearing aid body houses a microphone and a receiver, where the microphone is positioned within the hearing aid body to measure acoustic signals from an ambient environment, and where the receiver is positioned within the hearing aid body to emit acoustic signals toward a tympanic membrane of a user; an expandable element, where the expandable element is operatively connected to the hearing aid body, and where the expandable element is configured to encompass a circumferential portion of the hearing aid body when expanded; and an inflation management system, where the inflation management system is configured to expand the expandable element when actuated.

The invention provides a passenger cabin of a railway vehicle with increased interior space. A multifunction module 200 including an air conditioning duct 220, an illuminating apparatus 250, a speaker 260 and the like is disposed on a connecting portion (shoulder portion) between a roof structure 30 and a side structure 50 of a railway vehicle. A baggage rack bracket 310 and a hand strap bracket 350 are passed through and hung from the roof structure 30. A connecting block connecting the brackets 310 and 350 at the upper portions and being fixed to the air conditioning duct 220 is attached to the roof structure 20. Since the multifunction module 200 is fixed only to the roof structure 30, the attaching operation thereof is facilitated. Since the air conditioning duct 220 is disposed on the shoulder portion, the height of the interior space of the vehicle at the center in the width direction of the car body can be increased. An inside panel 210 for improving the appearance of the multifunction module 200 is further disposed.

The invention discloses an antenna module and electronic equipment. The antenna module comprises a feed point, a capacitor, a metal sheet, a metal frame, a single-pole multi-throw switch, a capacitance-resistance sensitive component, a first grounding point and a second grounding point, wherein the feed point is electrically connected with an RF module of the electronic equipment and connected to the metal sheet via the capacitor, the metal sheet is electrically connected to a first contact point of the metal frame, a slit is formed between the metal frame and a metal casing of the electronic equipment, one end of the capacitance-resistance sensitive component is electrically connected to the first grounding point, the other end of the capacitance-resistance sensitive component is electrically connected to a second contact point of the metal frame via the single-pole multi-throw switch, the first and second grounding points are both arranged on the metal casing, and the second grounding point is electrically connected to a third contact point of the metal frame. According to technical schemes of the invention, performance and bandwidth of the antenna module are improved.

The invention discloses an eight-unit MIMO antenna applicable to a 5G mobile terminal. The antenna comprises a dielectric substrate; a floor is arranged at the bottom of the dielectric substrate; 1*8brackets are arranged above the dielectric substrate; a microstrip antenna structure is etched on each bracket; a grounding point and a feeding point are arranged on each microstrip antenna structureseparately; and each grounding point is welded with the floor. The antenna has a relatively large clearance region, so that the array antenna has very high radiation efficiency; the antenna radiationefficiency within 5G frequency band is greater than 62%; in addition, the antenna structure is heightened through the design of the brackets, so that the radiation space is enlarged, and the array antenna obtains relatively high radiation gain; the design adopts a special arrangement mode, so that the isolation degree between antennas is all greater than 10dB; and furthermore, the array antenna provided by the invention has the characteristics of simple structure and small dimension, so that the antenna has very high practical value in mobile terminal communication.

An electrical generator apparatus, which is configured to convert an external actuation force applied by a vehicle traveling on a roadway into electrical energy, includes a rotatable top portion adapted to receive the external actuation force applied by the vehicle traveling on the roadway; a plurality of linkage members operatively connected to one another in succession, the rotatable top portion being operatively coupled to a first one of the plurality of linkage members; a first wheel operatively coupled to a last one of the plurality of linkage members; a second wheel operatively coupled to the first wheel via a tangential coupling element; a rotatable shaft operatively coupled to the second wheel; at least one flywheel operatively coupled to the rotatable shaft; and at least one electrical generator operatively coupled to the rotatable shaft, the electrical generator adapted to convert a rotational movement of the rotatable shaft into electrical energy.

The embodiment of the invention discloses an antenna fabrication method of a terminal. The antenna fabrication method comprises the steps of processing a conductive layer on decoration surface of a decoration sheet; processing filling layers on regions except the conductive layer on the decoration surface, wherein the thicknesses of the filling layers are same as the thickness of the conductive layer; processing the decoration sheet with the conductive layer and the filling layers to form a decoration membrane with a preset shape; pasting the decoration membrane on an outer surface of a shell of the terminal, wherein a through hole is formed in a position, corresponding to an antenna circuit in the terminal, on the shell pasted with the decoration membrane and is used for communicating the conductive layer and an inner surface of the shell; and filling the through hole with a conductive carrier to be used as an antenna contact.

The invention discloses a construction method for a fabricated type corrugated steel inclined web combined beam. The method includes the steps that corrugated steel inclined web boundary beams and corrugated steel straight web middle beams are prefabricated on a prefabrication field; bridge abutment or piers are completed on the construction field, temporary supports are set up, the prefabricated beams are transported to the construction field, and the prefabricated corrugated steel inclined web boundary beams are hoisted to specific positions in a segmented mode; transverse connecting reinforcing steel bars of top plates and bottom plates in every two adjacent prefabricated beams are bound and welded; pouring is conducted on longitudinal wet joints and boundary beam top plate wing edge plates between every two adjacent beams again, the corrugated steel webs in the prefabricated beams are connected through bolt connection or welding, the longitudinal reinforcing steel bars are bound and welded, pouring is conducted on transverse wet joints and beams, and one-span simply supported beams or multi-span continuous beam systems are formed; the supports and formworks are detached when certain strength of concrete is reached, system conversion is completed, and construction ends. According to the construction method, clearance on the two sides of the bottom of a box girder can be effectively increased, and the construction method can meet the requirements of urban overpasses for underground and ground transportation.

The invention discloses a composite beam comprising a steel beam with concrete at the abdomen. The composite beam comprises a steel beam (1) and a floor plate (7), wherein the concrete (5) is poured at the abdomen of the steel beam (1); the outer wall of the concrete (5) is flush with the outer sides of an upper flange and a lower flange of the steel beam (1); a steel reinforcement cage (4) is embedded at the abdomen of the steel beam (1); an abdomen shearing force connecting piece (3) is welded at the abdomen of the steel beam (1); reliable bonding and joint working of the concrete at the abdomen of the steel beam and the steel beam (1) are ensured through the abdomen shearing force connecting piece (3); outer shearing force connecting pieces (2) are welded at the outer side of the upper flange of the steel beam (1); and combination and joint working of the steel beam (1) and the floor plate (7) are realized through the outer shearing force connecting pieces (2). Compared with the prior art, the combination with the floor plate is taken into account, the whole bearing capacity and rigidity are improved, the section height of a member is decreased, and the building clearance is increased, so that the economic performance is greatly improved.

The present invention relates to a longitude-latitude bidirectional cross-layer connected hollow fabric, which comprises an upper layer surface and a lower layer surface and is characterized in that the upper layer surface of the hollow fabric is made by intertexture of upper-layer-surface ground latitudinal yarns and upper-layer-surface ground longitudinal yarns, and the lower layer surface of the hollow fabric is made by intertexture of lower-layer-surface ground latitudinal yarns and lower-layer-surface ground longitudinal yarns; connecting longitudinal yarns and connecting latitudinal yarns mutually and perpendicularly connect with the upper layer surface and the lower layer surface of the fabric in the cross-layer way; the connecting latitudinal yarns, besides interlacing with the ground longitudinal yarns of the upper layer surface, interlace with the longitudinal yarns of the lower layer surface in the cross-layer way; the connecting longitudinal yarns, besides interlacing with the ground latitudinal yarns of the upper layer surface, interlace with the latitudinal yarns of the lower layer surface in the cross-layer way; the connecting longitudinal yarns and the connecting latitudinal yarns are distributed in a X-shaped cross in the mutually perpendicular direction. With a bidirectional support structure, the core structure has the advantages of light weight, excellent bending and pressing resistance, thermal insulation property as well as high specific rigidity and specific strength. The core structure has the functions of impact resistance and energy absorption, and can be widely applied to fields of aeronautics, aerospace, vehicles, ships, architectures, physical education facilities, etc.

A differential two-stage Miller compensated amplifier system with capacitive level shifting includes a first stage differential transconductance amplifier including first and second output nodes and an output common mode voltage, a second stage differential transconductance amplifier including non-inverting and inverting inputs and outputs and an input common mode voltage, and a level shifting capacitor circuit coupled between the first and second output nodes and the non-inverting and inverting inputs for level shifting between the output common mode voltage of the first stage and the input common mode voltage of the second stage.

The invention discloses a built-in polyvinyl chloride (PVC) pipe enhanced reinforced concrete combined column, which comprises PVC pipe concrete, a reinforced cage and common concrete, wherein the PVC pipe concrete is buried in the center of the section of the reinforced concrete combined column; the reinforced cage is embedded into the periphery spaced from the PVC pipe concrete at a certain distance; and the concrete is grouted into a residual space on the section of the combined column. By the PVC pipe concrete, the bearing capacity of the general common concrete column can be improved, the relative section size is reduced, and the clear space of a building is enlarged; the durability of the concrete is improved, and invasion of harmful substances is prevented; and a PVC material is low in cost, so that the using amount of steel and the manufacturing cost can be saved. Under the condition of same bearing capacity, compared with the profile steel concrete (SRC) column or the steel pipe concrete (CFS) column, the built-in PVC pipe enhanced reinforced concrete combined column has the advantages that the steel consumption can be greatly reduced, the corrosion resistance is high, the durability is high, the cost performance is high, and the construction cost can be greatly saved.

The invention relates to the technical field of subway tunnel construction, and provides a subway tunnel lining trolley. On the premise that portal units and supporting accessory units are certain, a bracket unit and template units are specifically designed, and therefore it is guaranteed that the trolley is suitable for subway tunnels with different profile sections. Portal vertical columns are in an inclined structural mode, the length of a portal beam meets requirements, and space between the portal vertical columns and portal longerons is increased; the two ends of the portal beam are designed to be in a stepped shape, portal upper longerons are installed in steps, and therefore the installation height of the portal upper longerons is reduced; the clearance of the portal units is increased through the design. In addition, small moving dies are designed in a bottom chamfer structural mode; the portal longerons are lengthened in the tunnel length direction, and a deforming mechanism and a climbing mechanism are installed on the portal longerons; the demold amount of the trolley is increased through the design, and it is guaranteed that the template units do not easily interfere with the deforming mechanism or the climbing mechanism in the die assembly process.

The invention relates to the method of beam cap connection for lengthening wind turbine generator blades. The method is particularly adopted for connecting beam caps of the blades in the lengthening and improving process of existing wind turbine generator blades. Each reinforced beam cap is manufactured in a beam cap reserved zone between one existing beam cap of one blade and the corresponding beam cap of one blade tip lengthening section, so that the problem of connection of every two existing beam caps is solved. The blades which are lengthened and improved through the method for connecting the beam caps of the wind turbine generator blades are safe and reliable in structure.

A light steel skeleton-concrete construction system is disclosed, which is aimed at damping earthquake energy and isolating vibration by eliminating vibration energy. It is composed of cage-shaped light steel skeleton system and light concrete filled in said light steel skeleton systems. It has also beams, columns, slabs and shear walls. Its advnatages are low story height, less steps of stairs, low cost, and high effect on resisting earthquake, typhoon, fire accident and insulating heat and sound.

The invention discloses an upper structure of a prefabricated cover-beam-free type combined steel plate bridge and an assembling construction method of the upper structure. The upper structure comprises a plurality of paths of combined steel plate longitudinal beams and supporting point concrete transverse beams; the plurality of paths of combined steel plate longitudinal beams are assembled along the transverse direction of the bridge to form a bridge-spanning main beam; and one path of the supporting point concrete transverse beam is arranged at each of two ends of each bridge-spanning main beam. According to the upper structure disclosed by the invention, the quantity of components in the upper structure of the bridge can be reduced and the weight of the components is reduced; the hoisting difficulty of field construction is reduced and the construction cost of buildings is saved; and a cover beam is not arranged, so that the defects in the prior art that the clearance under the bridge is low, the traffic limit under the bridge is great and the bridge landscape is poor are improved.

A differential two-stage Miller compensated amplifier system with capacitive level shifting includes a first stage differential transconductance amplifier including first and second output nodes and an output common mode voltage, a second stage differential transconductance amplifier including non-inverting and inverting inputs and outputs and an input common mode voltage, and a level shifting capacitor circuit coupled between the first and second output nodes and the non-inverting and inverting inputs for level shifting between the output common mode voltage of the first stage and the input common mode voltage of the second stage.

The invention relates to an antenna and a mobile terminal. The antenna comprises a metal shell, a first circuit board and a first connecting rib, the first circuit board comprises a first floor layer, the first circuit board is provided with a first breaking joint, the first breaking joint penetrates through the first floor layer, the metal shell is provided with a first slit and a second slit to enable the metal shell to form a first shell, an intermediate shell and a second shell arranged in sequence, the intermediate shell is electrically connected with the first floor layer to enable the intermediate shell to form a system ground, the first connecting rib is arranged at the first slit, the first shell is electrically connected with the intermediate shell through the first connecting rib, the first slit forms a first slit segment through the first connecting rib, the first slit segment and the first breaking joint are both bar-shaped structures, the first slit segment is arranged opposite to the first breaking joint, the length dimension of the first slit segment and the length dimension of the first breaking joint are equal, and the first shell forms a radiator of the antenna. The first breaking joint is provided so that the clearance of the antenna is additionally provided, and the performance of the antenna is enhanced.

The invention discloses a construction method of large-span post-tensioned prestressed longitudinal and transverse frame beams, which comprises the steps of erecting a supporting body, producing a template, arranging a base template and a unilateral template, rolling longitudinal main reinforcements, installing a corrugated tube, rolling hoop reinforcements, embedding utility pipelines, mounting prestressing steel wires, mounting an anchor backing plate, closing a lateral templates, filling concrete grouts, pretensioning and grouting pore canals; in the pretensioning, the prestressing tendons of beams are stretched according to the following steps: (1) firstly, the frame beams at the top layer are stretched and then frame beams at the following layers are stretched; (2) the short spans of the longitudinal and transverse frame beams at the same layer are stretched first, and then the long spans thereof are stretched; (3) the upper prestressing tendon of a building unit is stretched first, and then the lower prestressing tendon thereof are stretched; and the left line and the right line of prestressing tendons are stretched symmetrically and separately. The construction method adopts a stretching order from the upper layer to the lower layer and can construct the prestressed frame beams in accordance with an ordinary reinforced concrete structure layer by layer, thereby being capable of reducing the influence of concrete curing on the construction period and accelerating work progress.

The invention provides a gantry system of a tunnel lining trolley. The gantry system comprises a support frame, a gantry longitudinal beam, jacking mechanisms and transverse beam connecting beams. The support frame comprises a plurality of single support frame bodies, each single support frame body comprises a gantry transverse beam and two gantry upright columns, the two gantry upright columns of each single support frame body are symmetrically arranged, the gantry transverse beams are perpendicular to the gantry longitudinal beam and are positioned right above the gantry longitudinal beam, and the gantry upright columns are vertically arranged among the gantry transverse beams and the gantry longitudinal beam; the transverse beam connecting beams are parallel to the gantry longitudinal beam and are arranged on the gantry transverse beams; flange plates are arranged on the side surfaces of the gantry upright columns, and two groups of through holes which are used for mounting supporting jack seats and supporting cylinder seats are equidistantly formed in each flange plate; the jacking mechanisms are arranged at two ends of the gantry longitudinal beam. The gantry system has the advantages that the gantry system is simple in integral structure; the supporting jack seats and the supporting cylinder seats can be conveniently vertically adjusted owing to the through holes, so that requirements of different working conditions can be met, and the gantry system is high in practicality; supporting jacks and supporting cylinders can be flexibly mounted and adjusted, accordingly, the construction cost can be greatly lowered, and the labor intensity can be greatly relieved.

The invention relates to a depressed center flat car. A middle beam, a side beam combination or a fully enclosed integral pattern is adopted by the vertical carrier beam of the existing depressed center flat car, cargoes are loaded uniformly in a carrying surface or two sides of a longitudinal central line of a car body, the curved beam of the carrier beam is concave-shaped, a transition angle of the curved part is mostly between 55 degree and 75 degree, and no slip devices and tool storage devices are arranged. The depressed center flat car invention comprises a concave-shaped chassis (3), wherein two end-tails of the concave-shaped chassis are connected with a car coupler damping device (1) and an end tilter (7), a hand brake device (2) is arranged on one end of the concave-shaped chassis, two ends of the lower part of the concave-shaped chassis are connected with a bogie (4), an air braking device (5) is arranged on the middle-lower part of the concave-shaped chassis, and the concave-shaped chassis is connected with a middle part storage device (6). The depressed center flat car is used for the railway transportation of special automobiles, such as shipping spare parts.

An electrical generator system configured to convert an external actuation force applied by a vehicle traveling on a roadway into electrical energy is disclosed herein. The electrical generator system includes at least one electrical generator apparatus and a maintenance access assembly disposed adjacent to the at least one electrical generator apparatus. The maintenance access assembly includes a plurality of bounding walls defining a maintenance passageway for gaining service access to the at least one electrical generator apparatus. The maintenance access assembly further includes an access manhole disposed in an upper one of the plurality of bounding walls and above the maintenance passageway so as to facilitate access to the maintenance passageway.

The invention relates to a vibration-damping temperature-insulation elemental-plate-type ballast-less track structure. The structure comprises a trisection asphalt grading macadam base layer, a rubbermodified asphalt layer and a track panel layer which are laid from bottom to top in sequence; the trisection asphalt grading macadam base layer comprises a grading macadam layer, an asphalt macadam mixture layer, and asphalt concrete mixture layer; the grading macadam layer is laid on filling and a soil base layer. According to the vibration-damping temperature-insulation elemental-plate-type ballast-less track structure, the structure stability of frozen soil can be effectively guaranteed, and the track panel layer can disperse upper loading and make upper loading evenly transmitted downwards; the rubber modified asphalt layer can lower influence of vibration generated by a high speed running train on a lower structural layer, and the effects of buffer and vibration damping are achieved;the void content of the trisection asphalt grading macadam base layer gradually increases from top to bottom, the void content of an upper-layer mixture and a middle-layer mixture is relatively low,the influence of the temperature on a frozen soil layer is insulated, and meanwhile the waterproof effect can also be achieved; the elemental-plate-type track structure is adopted and has the advantages of specific force transmission mode, excellent smoothness and stability, quick repairing and the like.

The invention relates to splittable antenna equipment as well as a method and a device for controlling the antenna equipment, and is used for improving the antenna efficiency of a mobile terminal. The splittable antenna equipment comprises an antenna element and a rotatable metal frame, wherein the rotatable metal frame is clung to a side surface of the mobile terminal when the antenna equipment is in a first state; the rotatable metal frame is electrically connected with a feed point of the antenna element through rotation when the antenna equipment is in a second state. The technical scheme can enable the rotatable metal frame and the antenna element to be combined into an external mobile phone antenna, thereby improving the antenna efficiency of the mobile terminal.

The embodiment of the invention discloses a signal enhancement device, a signal enhancement system, a signal processing method and a mobile terminal. The signal enhancement device provided by the invention comprises a first radio frequency module, a first Bluetooth module and a battery module, wherein the first radio frequency module is connected with the first Bluetooth module for transmitting data, the battery module is respectively connected with the first radio frequency module and the first Bluetooth module for powering the first radio frequency module and the first Bluetooth module, the first radio frequency module is used for receiving first wireless information or sending second wireless information, the first Bluetooth module is used for sending the first wireless information to the mobile terminal or receiving the second wireless information sent by the mobile terminal, the first radio frequency module comprises a first antenna and a first modulation-demodulation module, and the first antenna is connected with the first modulation-demodulation module that is also connected with the first Bluetooth module. The signal enhancement device provided by the invention can improve communication quality of a handset, and is convenient to carry and wider in application range.

Continuous cross sectional profile guide tracks in an outer sliding sunroof / moonroof are provided where both the front and rear mechanism or mechanism links travel fore / aft in the same channels as each other and have fore / aft travel that is limited only by vehicle architecture. The guide track channel is partly or entirely outside / outboard of the primary water / wind sealing system of the sunroof.

A phase lock loop (PLL) is an important component in wireless systems. CMOS technology offers voltage controlled oscillator designs operating at 60 GHz. One of the difficulties is dividing the high frequency clock down to a manageable clock frequency using conventional CMOS. Although injection locked dividers can divide down this clock frequency, these dividers have limitations. A divide by 2 is presented that uses several techniques; feed forward, clock amplification and series peaked inductors to overcome these limitations.