134results about How to "Reduce design difficulty" patented technology

The invention discloses a high-voltage pulse power supply for a plasma sewage treatment system. The high-voltage pulse power supply comprises a power frequency rectifying and filtering circuit, a first-stage boosted circuit, a second-stage boosted circuit and a voltage coupling circuit. The power frequency rectifying and filtering circuit is connected with a municipal power grid to convert power frequency alternating current into direct current. An input end and an output end of the first-stage boosted circuit are respectively connected with an output end of the power frequency rectifying and filtering circuit and an input end of the second-stage boosted circuit to achieve the functions of boosting and rectifying and filtering. The second-stage boosted circuit is boosted again and outputs stable high-voltage direct current and stable high-voltage alternating current. The voltage coupling circuit couples and superimposes the alternating current and the direct current and loads the alternating current and the direct current to equivalent loads of a plasma reactor. According to the high-voltage pulse power supply for the plasma sewage treatment system, the traditional method that two independent alternating-current power supply and direct-current power supply are used for carrying out coupling discharging is changed, the number of needed hardware components is decreased to a great extent, space and cost are saved, loss is reduced, and reliability and stability of a power supply system are improved.

The invention discloses a projection type planar waveguide helmet-mounted displayer. The projection type planar waveguide helmet-mounted displayer comprises a mini-type display device, a projection optical system, a planar waveguide and a reflection type projection screen, the planar waveguide is internally provided with an optical coupling-in end and an optical coupling-out end, and light rays sent by the mini-type display device are imaged through the projection optical system and are transmitted to enter the optical coupling-in end of the planar waveguide. The optical coupling-in end reflects the received light rays to enable the reflected light rays to be totally reflected between two reflection planes of the planar waveguide many times to be transmitted to the optical coupling-out end of the planar waveguide. The optical coupling-out end reflects the received light rays to the reflection type projection screen. The reflection type projection screen reflects the received light rays to enable the light rays to return according to the original path, then the light rays are transmitted to the human eyes from the optical coupling-out end of the planar waveguide. By means of the method, the problem that an existing helmet-mounted displayer is large is solved, the observing view field can be expanded by designing different structures, and the designing difficulty of the projection optical system is reduced.

The invention discloses a low phase stray frequency synthesizing method and application. The frequency distribution relationship of the synthesizing scheme is definite in current technique for definite output frequency; the invention changes that situation, uses character that any output frequency may multiple distribution relationships in frequency synthesizing scheme of multiple adjustments, on precondition of ensure to obtain the output frequency, by detecting output signal (by phase noise automatic detecting system), choosing best distribution relationship of frequency purity especially stray index, and storing it into RAM/ROM. When using the frequency synthesizer, corresponding frequency relationship is read out from the RAM/ROM in checking table mode to achieve purpose of designing high distinguishability, low stray low phase noise agility frequency changing microwave millimeter wave frequency synthesizer, so the performance of the microwave millimeter wave frequency synthesizer is increased, specially the debugging difficulty of stray index of frequency synthesizer is decreased greatly.

The invention discloses a method for on-line burning of the flash of an electric controller of an automobile. The method comprises the following steps that: 1, a computer is connected with the electric controller of the automobile by a CAN bus, and the computer serving as the main equipment establishes a logic connection with the electric controller of the automobile according to the CCP protocol; 2, the computer transfers a FlashKernel file to an RAM of the electric controller of the automobile, and runs the FlashKernel file in the RAM; and 3, the computer serving as the main equipment establishes a logic connection with a kernel program of the flash according to the CCP protocol, and the computer calls the service program of the flash to erase, modify and cover the flash of the electric controller of the automobile. The method has the advantages of lowering the design difficulty of the ECU, lowering production cost, and simultaneously not occupying the space of the flash.

The invention relates to a power supply chip which comprises a sub power supply module and a feedback voltage setting module, wherein the sub power supply module is used for outputting a voltage, the feedback voltage setting module is electrically connected with the sub power supply module and used for sampling a first feedback voltage according to the output voltage and judging whether a commandof adjusting the output voltage is received or not and adjusting the first feedback voltage into a second feedback voltage according to the command of adjusting the output voltage and feeding the second feedback voltage back to the sub power supply module; and the sub power supply module is used for adjusting the output voltage according to the second feedback voltage. The invention also providesa method for adjusting the output voltage of the power supply chip. The power supply chip and the method for adjusting the output voltage of the power supply chip can correct the output voltage of the power supply chip through a simulator, and reduce the peripheral elements of the power supply chip.

The invention discloses a semi-underground large-size horizontal vacuum container for plume test research, which comprises a vacuum container, a vacuum acquiring system, a propellant supply system and a matching foundation, belongs to the field of brand-new tests, is different from the traditional ring die devices and is specially used for the plume effect test research of an engine. The semi-underground large-size horizontal vacuum container is designed into a semi-underground structure, the low-half part of the vacuum container is positioned below the horizontal plane, the vertical distance from the central axis of the vacuum container to the horizontal plane is 1.3m and is controlled to be within a range of the body height of an adult, and thus, a worker conveniently installs and maintains test devices such as an engine at the central axis in the vacuum container; and the diameter of a door is about 2.4m, the design difficulty of the door is lowered, the door is conveniently opened or closed, people enters or exits from the door, and thus, the demand of the flume test is met. The lower end of a rear saddle is fixed firmly by using a base plate and a rear bearing foundation, and thus, the radial movement of the vacuum container is avoided, and the height of the rear saddle can be regulated through the thickness of the base plate.

The invention discloses an LLC resonant converter and a control method, and the LLC resonant converter is lower in design difficulty, and comprises an inverter circuit, an LLC resonant cavity, a transformer and a rectification network which are sequentially connected from the input to the output. The LLC resonant cavity comprises a resonant inductor Lr, an excitation inductor Lm and a resonant capacitor Cr, and is additionally provided with a two-way switch; the resonant inductor Lr and the resonant capacitor Cr are connected in series between the first output end of the inverter circuit and the first end of the primary side coil of the transformer. The second output end of the inverter circuit is connected with the second end of the primary side coil of the transformer, the excitation inductor Lm is connected with the primary side coil of the transformer in parallel, the first end of the two-way switch is connected with the first end of the primary side coil of the transformer by being connected between the resonance inductor Lr and the resonance capacitor Cr, and the second end of the two-way switch is connected with the second end of the primary side coil of the transformer; theresonant inductor Lr is connected between the first end of the two-way switch and the first end of the primary side coil of the transformer, and the resonant capacitor Cr is connected between the first end of the two-way switch and the first output end of the inverter circuit.

The invention discloses a sampling time error correction method for a multi-channel parallel ADC system. The method comprises the steps that the output end of an analog low-pass filter and the input end of the multi-channel parallel ADC system are connected through a switching circuit, and an analog input signal x (t) enters the analog low-pass filter to obtain a narrow-band analog signal d (t), the multi-channel parallel ADC system samples the d (t) to obtain a multi-channel sampling output signal yd (n), and LMS-frequency domain self-adaption estimation is performed on the yd (n) to obtain a sampling time error omega (n); sending the analog input signal x (t) into the multi-channel parallel ADC system through the switching circuit, performing sampling to obtain a sampling output signal y (n) which is processed by a digital differential analyzer and then subjected to a first multiplying unit with omega (n) to obtain a system error signal c (n), and y (n) and c (n) are subjected to a subtractor to obtain the corrected output signal yc (n). According to the method, the problems of aliasing and the difficulty in achieving of high-rate hardware circuits are solved on the basis of error correction.

The invention discloses an image sensor module and a forming method of the image sensor module. The image sensor module comprises a PCB substrate, a metal layer, an image sensing chip, a signal processing chip and welding protrusions. The PCB substrate is provided with a hole penetrating through the PCB substrate, the metal layer is arranged on the surface of the PCB substrate, the image sensing chip is inversely arranged above the PCB substrate, the image sensing chip is provided with an image induction area and a bonding pad surrounding the image induction area which is arranged above the hole, the bonding pad is electrically connected with the metal layer, the signal processing chip is inversely arranged above the PCB substrate, the signal processing chip is electrically connected with the metal layer, and the welding protrusions are arranged on the surface of the metal layer. The packaging performance of the image sensor module is improved, and the production cost of the image sensor module is reduced.

The invention discloses a millimeter wave antenna, and belongs to the technical field of antennas. The millimeter wave antenna comprises an N-layer dielectric substrate, a first metal layer, a secondmetal layer, a first radiation patch, a feed structure and a plurality of conductive structures, wherein the first metal layer, the N-layer dielectric substrate and the second metal layer are stacked.A plurality of conductive structures penetrate through the N-layer dielectric substrate. Each conductive structure is connected with the first metal layer and the second metal layer, and a pluralityof conductive structures can form a dielectric cavity through enclosing. The feed structure is used for feeding an excitation signal to excite the dielectric cavity to resonate at a first resonance frequency. According to the millimeter wave antenna, the dielectric cavity can be excited by the excitation signal fed by the feed structure to generate the millimeter wave signal of the first resonantfrequency in the mode of a higher-order mode so as to ensure the effectiveness of high gain of the millimeter wave antenna and reduce the space occupied by the millimeter wave antenna in the terminal.

The invention discloses a language interaction method applied to a language interaction process between a user and a robot. A storage unit is used for storing a preset semantic statement, and the semantic statement comprises domain sentences representing of single domain attributes and general sentences representing multi-domain attributes. The voice interaction method of an event comprises the following steps of 1, acquiring a natural language sentence output by the user; 2, performing semantic parsing on the natural language sentence to acquire a corresponding semantic parsing result; S3, processing according to the semantic parsing result by the robot to output a corresponding response result; 4, acquiring a feedback sentence output by the user; 5, judging whether the feedback sentence is an ending command, if yes, executing the step 7, and otherwise executing the step 6; 6, performing semantic parsing on the feedback sentence to acquire the corresponding semantic parsing result, and returning to execute the step 3; and 7, ending.

The invention discloses a device for adjusting a laser beam divergence angle in real time. In the device, a beam expander secondary mirror, a fixed wedged mirror, a guide rail and a beam expander main mirror are sequentially fixed on a base, the vertical light transmission surface of the fixed wedged mirror is arranged opposite to the beam expander secondary mirror; the guide rail is parallel to the inclined light transmission surface of the fixed wedged mirror, a translation platform is arranged on the guide rail, an adjustable wedged mirror is arranged on the translation platform; the inclined light transmission surface of the adjustable wedged mirror is arranged opposite to the inclined light transmission surface of the fixed wedged mirror in parallel; the translation platform is used for carrying the adjustable wedged mirror to move along the guide rail, and laser varies with the changes of the lens thickness of the adjustable wedged mirror so as to change a light path between the beam expander main mirror and the beam expander secondary mirror and achieve the aim of changing the laser beam divergence angle. In the process of changing the laser beam divergence angle by the device for adjusting the laser beam divergence angle in real time, which is provided by the invention, a laser transmitter optical axis can be kept stable so that the emitted laser stably irradiates on a target favorably. The device for adjusting the laser beam divergence angle in real time, provided by the invention, has the advantages of simple structure and convenience in use and is suitable for application to a high-accuracy focusing system.

Disclosed are a magneto-acoustic coupling imaging excitation and detection method and device based on low-frequency continuous waves. The method comprises the two steps of generation of excitation signals of the low-frequency continuous waves and detection of the low-frequency continuous magneto-acoustic waves. According to generation of the excitation signals, the low-frequency continuous waves are used for conducting excitation on an imaging sample, the excitation waveform is realized by adopting continuous sine waves or continuous sine pulses with a duty ratio, and the frequency of the excitation signals is determined according to the imaging sample and spatial locating precision. Detection of the low-frequency continuous magneto-acoustic waves is realized by the adoption of a continuous wave signal detection method or a lock-in amplifying method. The device comprises a function generator used for generating the excitation signals of the low-frequency continuous waves and a power amplifier connected with the output end of the function generator and used for conducting amplifying on the output excitation signals, the output end of the power amplified is connected to the detected sample placed in a magnetic field and the output end of the function generator is further connected with a detector. The magneto-acoustic coupling imaging excitation and detection method and device have the advantages that the test devices are simplified, the excitation source designing difficulty is lowered and the application safety of the imaging method is improved to some extent.

The invention discloses a three-terminal atom switching device and a preparing method thereof, and belongs to the technical field of microelectronic manufacturing and memorizers. The three-terminal atom switching device comprises a stacking structure comprising a source end and a drain end, a vertical groove formed by etching the stacking structure, an M8XY6 channel layer formed on the inner wall and the bottom of the vertical groove, and a control end formed on the surfaces of the M8XY6 channel layer, the vertical groove is full of the control end, and a source end resistor and a drain end resistor are regulated through the control end. On the basis of the three-terminal atom switching device, the high switching ratio characteristic is achieved in the height nonlinearity changing characteristic of the resistance between the source end and the drain end along with the voltage of the control end, the structure is simple, integration is easy, density is high, cost is low, the three-terminal atom switching device can be applied to a gating tube of a cross array structure, and the crosstalk phenomenon caused by leakage current is restrained. The three-terminal atom switching device is also suitable for a plane stacking cross array structure and a vertical cross array structure, and the high-density three-dimensional storage is achieved.

The invention belongs to the fields of ocean utilization and renewable energy source generation, relates to a float type seawave power generation device, and is characterized by comprising a floating body, a balance floating body, a pulley, a rope, an input shaft, a clutch, an output shaft, a flywheel, a permanent magnet synchronous generator and an AC-DC-AC power converter, wherein, the floating body and the balance floating body are connected at two sides of the pulley through the rope; the pulley is coaxial with the input shaft; the input shaft is connected with the output shaft through the clutch; the clutch is used for leading the output shaft to rotate in one direction; the flywheel coaxial with the output shaft is fixed on the output shaft; the other end of the output shaft is connected with the permanent magnet synchronous generator; and the output of the generator is connected with the AC-DC-AC power converter. The float type seawave power generation device of the invention utilizes the energy when the floating body descends in a vertical direction, which can reduce design difficulty of small machinery and hydraulic mechanisms, is also beneficial for the realization of the largest wave energy capturing control strategy.

The present invention discloses a cryptographic device and an implementation method thereof. A field programmable gate array system-level chip integrates an embedded ARM processor, and the field programmable gate array system-level chip is internally provided with a finite state machine; the ARM processor is connected with and communicates with the field programmable gate array system-level chip through an external memory interface; a nonvolatile flash memory is connected with the ARM processor and is configured to store firework programs, first secret keys and data of the ARM processor; and the finite state machine is connected with a plurality of cryptographic algorithm modules and a plurality of random number generators, the finite state machine is configured to schedule the cryptographic algorithm modules and the random number generators, and the random number generators are configured to generate true random numbers. The implementation method comprises the steps that: the ARM processor analyzes control instruction information and data to be decrypted received by the cryptographic device, determines whether the first secret keys are needed to be used or not, different secret keys are used in different conditions, and encryption and decryption operation and operation data transmission are completed.

The invention discloses a serial communication clock data recovery system and relates to the field of high-speed serial communication systems. Sampling data passes through an Alexander phase discriminator with the 1/4 rate, the phase position relations of the data and eight phase clocks are compared, UP and DN signals control a charge pump to discharge, and then through a comparator and a counter, a phase selection/phase interpolation circuit is controlled. The phase selection/phase interpolation circuit carries out selection and interpolation operation on eight phase reference clocks, a pair of orthogonal clocks are output to enter a delay phase-locked loop, and the delay phase-locked loop generates the eight phase clocks to sample input data respectively until the four phase clocks of the eight phase sampling clocks are aligned with the jumping edge of the data; then the remaining four phase clocks are aligned with the middle of the data at the moment and are recovered data sampling clocks; the frequency of the sampling clocks is lowered and is 1/4 the frequency of the data, in this way, the design of a clock circuit is simplified, and meanwhile the dynamic power consumption of the circuit is lowered.

The invention discloses a water-air dual-purpose fish swarm detection unmanned aerial vehicle, which comprises a pressure-resistant shell, wherein the pressure-resistant shell is a cylindrical sealingstructure with two ends protruding outwardly; An air propeller disposed at one end of the pressure-resistant housing; An engine arranged on a side of the pressure-resistant housing close to the air propeller and powering the air propeller through a power bearing; A flying wing symmetrically arranged in the middle of the pressure-resistant housing; An underwater propeller is arranged at the otherend of the pressure-resistant housing and is powered by a lithium battery pack. The water-air dual-purpose fish swarm detection unmanned aerial vehicle provided by the invention has the advantages offlexible underwater movement, high endurance, automatic tracking detection of the fish swarm from the air and the water, convenient fishing by driving the fish swarm, reduced oil consumption of the fishing vessel, greatly improved fishing efficiency, and high popularity.

The invention discloses an alarm type thermal fuse-link which comprises a shell, a first electrode and a second electrode which are arranged in the shell and an alloy fuse-link which is connected with the first electrode and the second electrode. Besides, an alarm electrode is arranged aside the first electrode or the second electrode while a contracting agent is packed around the alloy fuse-link. When the alloy fuse-link automatically fuses caused by the overheating alarm type thermal fuse-link, the fused alloy fusing material contacts towards the electrode direction at two ends and reunitesat the position of the electrode under the action of the surface tension and the contracting agent. Due to the alarm electrode arranged on one end, the reunited fused alloy fusing material connects the alarm electrode with the electrode so as to form a close contact to output a normally closed contact signal. The alarm type thermal fuse-link of the invention can output an alarm remote-control signal while can automatically fuse the circuit by the fuse.

The invention relates to an anti-collision radar antenna for an automobile, in particular to an anti-collision 77GHz millimeter wave radar antenna for the automobile, and belongs to the technical field of radar. A way of combining an antenna and lenses is adopted. The radar antenna consists of a lens support plate, a microwave circuit support plate, a plurality of dielectric lenses, a transmission antenna, a plurality of receiving antennae and corresponding wireless transmission and reception control modules, wherein the wireless transmission and reception control module integrates a transmission control module and a reception control module; the transmission antenna is a single wide-beam antenna; the reception antenna is a multi-beam antenna formed by adopting a plurality of narrow beam antennae; the beamforming of the transmission antenna and the receiving antennae is realized by adopting the dielectric lenses; the dielectric lenses are independently hanged on the lens support plate; and the transmission antenna and the receiving antennae are all arranged on the microwave circuit support plate. The anti-collision 77GHz millimeter wave radar antenna for the automobile has a flexible design and a simple structure, ensures system stability, sensitivity and accuracy and can realize the highly-accurate angle measurement and rapid switching of the receiving antennae.

The invention provides an AMOLED column driving circuit and a driving method thereof. The AMOLED column driving circuit comprises a linear digital-analog conversion circuit; a Gamma correction output stage circuit used for carrying out Gamma correction on analog signals output by the linear digital-analog conversion circuit and driving an OLED pixel array to emit light; a clock control signal generation circuit used for providing clock signals and control signals; and a bias circuit used for providing a reference voltage. The AMOLED column driving method comprises the steps of: converting digital signals into the analog signals, carrying out Gamma correction on the analog signals, and then inputting the analog signals after the Gamma correction into the OLED pixel array so as to drive the OLED pixel array to emit light. According to the invention, the linear DAC does not generate precision losses in the AMOLED column driving circuit, complex matching work is not needed by a resistor string when a resistor string DAC is used, and the design difficulty is lowered; in addition, the DAC relatively small in size can be adopted, the integral area of the circuit is further reduced, and the AMOLED column driving circuit has the advantages of simple design, small area, high precision, good image displaying effect and the like.

The invention provides an energy safeguard design method for an inertial space observation satellite. The energy safeguard design method comprises the following steps: (1) determining an inertial space observation satellite body coordinate system and a fixed sun-facing surface according to a satellite basic configuration and a solar wing mounting direction; (2) designing an attitude control algorithm on the basis of a fixed sun alignment surface, and minimizing an included angle between a solar vector and a vertical plane of a sailboard mounting shaft in a single observation process on the premise of ensuring observation direction and observation coverage required by observation; (3) designing a solar wing tracking algorithm according to the change rule of solar vectors based on an attitude control algorithm design result, so that the whole satellite obtains the maximum energy in the whole observation process; And (4) judging whether the energy design requirement is met by the satellites in the whole observation process or not, if so, ending, and otherwise, re-executing the steps (1)-(4). Excellent solar cell illumination conditions can be provided for the satellite system, the design difficulty of the satellite energy system is reduced, and energy supply of the whole satellite is ensured.

The non-coherent digital demodulation device for RDS signal to recover the RDS baseband signal without phase-locking comprises a ADC, a digital down converter, and a canceller for residual carrier with an amplitude calculator of CORDIC for baseband signal, and a symbol generator for baseband signal by comparing integration of I/Q signal and whether with same symbol.

The invention discloses a coaxial constant-speed turbine set for a blast furnace, which comprises an electric motor, a speed changer, a blast furnace blower and a high-speed blast furnace gas excess-pressure turbine, wherein the electric motor is connected to one side of the blast furnace blower through the speed changer; the high-speed blast furnace gas excess-pressure turbine is coaxially connected to the other side of the blast furnace blower; and a working rotating speed of the high-speed blast furnace gas excess-pressure turbine is as same as the working rotating speed of the blast furnace blower. The high-speed blast furnace gas excess-pressure turbine, a rotating speed of which (for example, 4800rpm) is as same as the rotating speed of the blast furnace blower, is selected and is coaxially connected to the blast furnace blower, thereby avoiding connecting the speed changer between the high-speed blast furnace gas excess-pressure turbine and the blast furnace blower, reducing the difficulty in designing an axis, promoting the utilization ratio of energy and reducing the demands on manufacturing and mounting of equipment.

The invention relates to the technical field of communication, and particularly relates to an antenna component and a mobile terminal. The antenna component comprises a rear cover provided with a closed metal middle frame free of breakpoint, and a circuit board which is arranged in the rear cover. The metal middle frame comprises a top plate and a side plate which curvely extends from the tail end of the top plate. The top plate is used for forming a diversity antenna. The circuit board is located in the metal middle frame. The circuit board comprises a grounding point and a feeding point. The feeding point and the grounding point are respectively electrically connected with the metal middle frame. A clearance area is arranged between the circuit board and the side plate along the extending direction of the circuit board. The circuit board and the clearance area form a three-in-one antenna. The three-in-one antenna is composed of a GPS antenna, a WIFI-2.4G antenna and a WIFI-5G antenna. According to the invention, the three-in-one antenna is arranged on the side; the diversity antenna is arranged on the top plate; the layout space of the diversity antenna is increased; the design difficulty of the diversity antenna is reduced; and the performance of the diversity antenna is ensured.

The invention discloses a single-unit beamforming dielectric resonant antenna. The antenna comprises a first dielectric resonator, a second dielectric resonator which is arranged below the first dielectric resonator, a metal ground layer which is arranged below the second dielectric resonator and is provided with a feed slot, a substrate which is arranged below the metal ground layer, and a feedstructure which is arranged below the substrate and is provided with a microstrip line, and at least one part of the microstrip line is located right below a feed gap. According to the invention, thefirst dielectric resonator and the second dielectric resonator are arranged as radiation units of the antenna; the feed gap is formed for the metal ground layer; coupled feeding is carried out on a radiation units of the antenna; a complex feed network is prevented from being used; the microstrip line is arranged in the feed structure, and at least one part of the microstrip line is located underthe feed gap; a feed position and excitation current distribution are provided; beam forming is achieved; the structure is simple, and the antenna size is reduced and the antenna can be widely applied to the technical field of antennas.

The invention provides an ECPT system with a double T-type resonant network and a parameter designing method thereof. Two T-type resonant networks are arranged at an electric energy transmitting end;the first T-type resonant network is a T-type LCL resonant network composed of an inductor L1, an inductor L2 and a capacitor C1; the second T-type resonant network is a T-type CLC resonant network composed of a capacitor C2, an inductor L3, and an equivalent capacitor Cs of an electric field coupling mechanism; an input end of the first T-type resonant network is connected to an output end of aninverter, and an output end of the first T-type resonant network is connected to an input end of the second T-type resonant network; and two ends of the inductor L3 in the second T-type resonant network are correspondingly connected to two emitting pole plates connected of the electric field coupling mechanism respectively. The effect is that the ECPT system can efficiently provide the required power to a load after the load is put in (loaded in) without any additional detection and control circuitry, works in a low-power standby state after the load is cut off (removed), and reduce the systemcost and the controller design difficulty.

The invention provides a mobile terminal, comprising a body, wherein the body comprises a first side and a second side which are opposite; and an image collection device which is set on the second side and comprises at least one camera, wherein the first side is equipped with a display screen, the second side is equipped with a second display screen, an area of the first display screen is greaterthan that of the second display screen, and the space between the first display screen and the frame of the body is smaller than preset space. The mobile terminal provided by the invention comprises the body and the image collection device. The first side and the second side of the body are equipped with the first display screen and the second display screen. The area of the first display screen is relatively large. The first display screen has a relatively high screen occupation ratio. The area of the second display screen is relatively small. The second display screen matches the first display screen. The relatively high screen occupation ratio of the first display screen is ensured, moreover, the multiband and multiantenna support of the mobile terminal is ensured, and a communication effect of the mobile terminal is ensured.

The invention discloses a high-precision short-distance ultrasonic ranging method, which comprises the following seven steps of: generating an initial signal; generating square wave emission signal; obtaining an ultrasonic receiving signal; calculating a transmitting and receiving time interval; repeatedly calculating and recording; obtaining a median of the transmitting and receiving time interval; and calculating a distance to be tested. The method has a good effect in application. Compared with the prior art, the method has the advantages that: the difficulty in designing a peripheral circuit for the high-precision short-distance ultrasonic ranging is reduced, and a ranging effect with high robustness is achieved at low cost.

The invention designs a hotspot-free internet access system of a shared mobile phone network. The system comprises a network sharing program module and a virtual network card in a client terminal, andan internet access agent program module in a mobile phone, wherein a first data communication end of the network sharing program module is connected with the data communication end of the virtual network card, and a second data communication end of the network sharing program module is connected with the data communication end of the internet access agent program module. The internet access of the shared mobile phone network is realized by adopting the network sharing program module and virtual network card of the client terminal and the internet access agent program module of the mobile phone, and an operation of setting a hotspot on the mobile phone is avoided in the internet access process, and the application program of the client terminal can directly access to the internet through the shared mobile phone network without setting the hotspot on the mobile phone.