169 results about "Periodic wave" patented technology

A method comprising a step (10) of acquiring a patient heart activity signal, a signal shaping step (11) comprising a step (19) of converting the analog signal into a digital signal, a step (12) of sensing a periodic wave in the signal, a step (13) of calculating time intervals between the periodic waves, a step (14) of determining digital time interval series, a step (15) of calculating a fractal dimension of the digital series, and a step (16) of calculating the depth of anesthesia on the basis of the fractal dimension.

A memory device includes a counter suitable for counting the number of times that a periodic wave is enabled and generating a code, one or more memory banks each including a plurality of word lines, and one or more measurement blocks corresponding to the memory banks, respectively, and suitable for measuring an active period of an activated word line in a corresponding memory bank among the memory banks, wherein each of the measurement blocks measures the active period of the activated word line based on a first value of the code at an activation starting point of the corresponding memory bank and a current value of the code.

The invention relates to a method for measuring high reflector reflection index which is characterized in that it adopts square wave or sinusoidal wave modulated wide-spectrum continuous laser as light source which enters into the stable resonator formed by two blocks of high reflectors; it uses square wave to modulate the up stage and down stage of the single period wave to obtain the lasting time and the channel reflecting index or uses fixed phase mode to detect the one-time or odd harmonic of light channel output signal; it uses the amplitude and the phase spiked value to modulate the angle frequency changing curve to obtain the lasting time and the channel reflecting index.

Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output quarter-cycle waveforms associated with levels of the received input signal.

The invention relates to high head, large unit width flood energy dissipation by hydraulic jump technique, in particular to a high-low bucket energy dissipation pool of hydraulic jump, wherein the invention adopts a proper contraction angle in the plane of the high bucket, and outside wall of the high bucket does not contract, after the flood of high bucket contracts, the distribution in the vertical section of flooding is changed, when the downstream water level is high, part of the flood entering the pool is properly raised to reduce flooding degree and to fully exert the characteristics of submerged jets, thereby lengthening the distance between the flood to the pool bottom plate, weakening surface periodic wave, improving effects, reducing tail bucket water surface fluctuating, and avoiding vertical-axis eddy at the backward-facing step boundary wall.

The invention discloses a single-layered composite element wideband periodic wave-absorbing structure, and belongs to the technical field of electronic materials. According to the invention, a dielectric layer printed with periodic array resistance patterns is arranged on a metal flat plate, the dielectric layer comprises a foam layer and periodic square ring-shaped resistive films arranged on the foam layer, and the periodic square ring-shaped resistive films consist of two kinds of resistive films of different sheet resistances.

Systems and methods for transpositional modulation and demodulation are provided. One such method for generating a signal includes the steps of providing a look-up table having a plurality of quarter-cycle waveforms, each of said quarter-cycle waveforms associated with a respective input level; receiving an input signal; and outputting quarter-cycle waveforms associated with levels of the received input signal. Systems for transpositional modulation are also provided. One such system for generating a signal includes a look-up table having a plurality of quarter-cycle waveforms. Each of the quarter-cycle waveforms are associated with a respective input level, and the look-up table is configured to receive an input signal, and output to quarter-cycle waveforms associated with levels of the received input signal.

A self-propelled mechanical crawler adapted to move on a medium. One example of such a crawler includes a foot, a wave generator adapted to drive a periodic wave in the foot, and a wave transfer mechanism coupled between the wave generator and the foot. The wave transfer mechanism may be adapted to translate the periodic wave produced by the wave generator into a corresponding periodic deformation in the foot so as to generate forces in the medium to propel the crawler.

The invention discloses a driving circuit for a LED which can provide a stable voltage source for a control module of the driving circuit to obtain a stable running stat of the driving circuit. According to traditional technology, an AC input end of a driving circuit for a LED is provided with a triac dimmer to half reduce inputted wave energy, which may lead to the case that in a period when input periodic wave has no energy, the control module can periodically locate at a low potential to cause failure of inner components; thereby the invention provides a control module which can continuously provide a power source voltage for the driving circuit for a LED, which is benefit for the application and popularization of the driving circuit for a LED and sets an example for present light display element drive circuit.

A system and method for level shifting a core, lower voltage in a one-stage level shift device to produce a higher, driving voltage. The system includes a first device that optimally functions with a first voltage and that outputs the first voltage. The system also includes a one-stage level shift device that receives the first voltage and shifts the first voltage to a second voltage without an intermediate voltage, the second voltage being higher than the first voltage. The system also includes a second device that receives the second voltage to optimally function. In some cases, the first voltage can be a periodic wave such that the higher voltage is produced with one portion of the level shift device during a first portion of the wave and another portion of the level shift device during a second portion of the wave.

A noise detection circuit includes a first delay unit suitable for delaying a periodic wave to output a delayed periodic wave, a first divider unit suitable for dividing the delayed periodic wave to output a first periodic wave, a second divider unit suitable for dividing the periodic wave to output a divided periodic wave, a second delay unit suitable for delaying the divided periodic wave to output a second periodic wave, and a detection unit suitable for comparing the first periodic wave with the second periodic wave and outputting a noise detection signal.

The invention discloses a touch sensing device which utilizes the characteristics of orthogonal vectors. A driving signal is modulated by means of an RSS (Random Spread Spectrum) signal or a periodic wave, thus driving one column of a sensing array. The RSS signal or the periodic wave is used for extracting the touch signal of a node from sensed signals measured by one column of the sensing array. The node is the intersection point of the driven column and the measured column. When different RSS signals and / or different periodic waves are utilized to simultaneously drive a plurality of columns, the touch information of a plurality of points can be obtained simultaneously from the same sensed signal by extracting the touch information of the plurality of points by means of the RSS signals and / or the periodic waves, respectively; and the plurality of points are the intersection points of the driven columns and the measured column.

A semiconductor system includes a plurality of memory chips. Each of the memory chips includes an oscillator suitable for generating a periodic wave in a self refresh mode, and a delay unit suitable for delaying the periodic wave to generate a refresh pulse and for setting a delay value based on a corresponding chip identification.

The rotation-angle detecting device of the present invention contains two rotators having the same number of teeth, which engage with a gear fixed to a rotation-detecting axle as a detected object. The detecting device further includes a controller. Receiving a rotation-angle signal from the rotators, the controller amplifies the signal, performs calculations, and stores the results. The controller converts each rotation-angle signal from each rotator into each periodic waveform output having the same crest value, and stores an initial phase difference value at initial setting. In driving operations, monitoring an evaluation value calculated with reference to the initial phase difference value, the controller determines that abnormalities occurred, if the evaluation value exceeds a predetermined abnormality-evaluation threshold.

A wave pool for producing periodic waves preferably having a first wave forming portion with an inclined section oriented obliquely relative to the travel direction of the waves, and a second wave dampening portion having a relatively deep solid chamber floor and a raised perforated floor above it for dampening the waves. The wave dampening portion preferably dissipates the waves, which in turn, reduces wave reflections and rip currents that can otherwise interfere with the oncoming waves.

A method and apparatus for generating a laser signal for driving a laser used in thermal-assisted recording. A channel of a hard drive generates a high-frequency component of the laser signal—e.g., a periodic wave or series of pulses—and synchronizes the phase of the laser signal with a corresponding write data signal which controls the magnetization of data bits within the magnetic disk of the hard drive. The channel may be connected to a read / write integrated circuit via a channel interconnect. The read / write circuit may include a second phase control to compensate for any phase shift and an adder circuit to combine the transmitted high-frequency laser with a DC bias. Further, the read / write circuit may include a feedback loop for adjusting the DC bias based on environmental parameters of the hard drive such as temperature.

The invention discloses a method for capturing an object by using a last pulse policy of a laser seeker of an unmanned aerial vehicle. According to the method disclosed by the invention, the last pulse policy is adopted, by means of effectively identifying a last pulse of an echo in a single laser period and filtering out atmosphere back scattering echo pulses, an echo signal of the object can be accurately captured within a signal gating time of a seeker detector, so that a laser semi-active seeker of an airborne guided missile of the unmanned aerial vehicle can filter out atmosphere back scattering echo signals and repeater inductive signals, can identify a real object echo pulse signal, in this way, disadvantages of laser guidance can be overcome, capturing, tracking and locking precisions for the object are greatly improved; according to the method disclosed by the invention, the last pulse policy is adopted, two sampling holders are used to perform alternative sampling and to keep gating, pulses in gates of a single laser periodic wave are all sampled, back scattering pulses or induced signal pulses which arrive before an object echo are filtered out, and the last pulse, namely the object pulse, is preserved, in this way, a signal-to-noise ratio of the object echo signal is greatly increased, and a striking effect of the airborne guided missile of the unmanned aerial vehicle under severe weather conditions is improved.

A resonance massage method and device for massaging acupuncture points on the wrist, wherein the massage device is provided with two wave generators which are placed on the inner and outer wrist to output periodic waves in opposite directions, and the opposite periodic waves resonate to create resonance which is capable of persistently massaging the acupuncture points on the wrist.

An integrated circuit includes a programmable storage unit suitable for operating with a plurality of powers and outputting stored data in response to a boot-up signal, a register unit suitable for storing the data outputted from the programmable storage unit, a internal circuit suitable for operating by using the data stored in the register unit, a voltage detection unit suitable for activating a power stabilization signal when levels of the plurality of powers are stabilized, and a boot-up control unit suitable for counting a number of activations of a periodic wave from a time of an activation of the power stabilization signal and activating the boot-up signal when the counted number reaches a predetermined number.

The invention discloses a dual-frequency wideband wave absorber, which comprises a periodic wave absorption surface structure, a first layer medium base plate, a periodic frequency selection surface structure, a second layer medium base plate, a metal shielding floor and plastic screws used for connecting the first layer medium base plate and the second layer medium base plate, wherein the periodic wave absorption surface structure is printed on the first layer medium base plate and consists of two metal round sheets, two opening resonant rings and wave absorption structure units; the two metal round sheets are symmetrical at the left side and the right side; the two opening resonant rings are symmetrical at the left side and the right side; the wave absorption structure unit is welded between the two metal round sheet arms. The periodic frequency selection surface structure is formed by a plurality of metal resonant units printed on the second layer medium base plate. The metal shielding floor is printed on the back side of the second layer medium base plate. The opening resonant rings and the metal resonant units simultaneously act to realize the reflection characteristics in a certain frequency band range, so that the double-frequency wideband sound absorption is formed. The wave absorption band width and the wave absorption rate can be changed through regulating the distance between the first layer medium base plate and the second layer medium base plate.

The disclosure relates to a method and apparatus for a wave pool having a deep end and a shallow end, wherein a plurality of wave generators is provided for producing wave segments in the wave pool. The wave generators are preferably extended substantially along the deep end in a substantially staggered manner relative to the travel direction of the wave segments. A pair of dividing walls is preferably provided in front of each wave generator, wherein the dividing walls are extended substantially forward in the travel direction and substantially parallel to each other or with a fade angle of no more than about 20 to 30 degrees relative to each other. The wave generators are preferably operated in sequence from one side of the pool to the other, such that a plurality of wave segments is generated at pre-selected time intervals, and such that the plurality of wave segments can travel forward and then, due to the stagger of the wave generators, merge together to form a substantially uniform resultant periodic wave. The resultant wave forms and travels forward and then breaks along the shallow end which preferably comprises a break line.

The invention discloses a negative voltage slope control circuit for controlling erasing voltage of a nonvolatile memory. The negative voltage slope control circuit comprises an oscillator, a first switch tube, a benchmark constant-current source, a mirror image constant-current source, a transient control capacitor and a second switch tube. The oscillator is used for generating periodic wave; the first switch tube is connected with the oscillator and is used for obtaining control periodic wave to control the connection and disconnection of the first switch tube; the benchmark constant-current source is connected with the first switch tube; the mirror image constant-current source is connected with the first switch and is used for mirroring the current of the benchmark constant-current source; the transient control capacitor is connected with the mirror image constant-current source; the second switch tube is connected between the transient control capacitor and the mirror image constant-current source; and the erasing voltage is output through the second switch tube. The erasing voltage obtained by the negative voltage slope control circuit avoids generating abrupt change to form ripple wave, thereby the defects in the prior art are overcome.

The invention relates to a coding wave-absorbing meta-material for the reflection section reduction of a broadband radar, and relates to the technical field of radar hiding and novel artificial electromagnetic materials. The meta-material comprises a plurality of periodic unit structures, and each unit structure comprises an upper conductive film layer, a dielectric substrate and a metal reflection backboard, wherein the upper conductive film layer is located on the upper surface of the dielectric substrate. The plurality of unit structures are arranged to be symmetric, thereby guaranteeing that an electromagnetic wave represents polarization insensitive characteristics. The wave-absorbing meta-material is spatially arranged, and has the symmetry breaking characteristics, wherein the arrangement mode is determined by the characteristics of the coding wave-absorbing meta-material. The wave-absorbing meta-material can achieve the RCS reduction effect (10dB or more) in a range of 6.5-20 GHz. Particularly, the target RCS reduction effect is better than the RCS reduction effect of pure periodic wave-absorbing materials in the range of 9-20GHz. The coding wave-absorbing meta-material isbetter in target RCS reduction than a conventional coding meta-material and the wave-absorbing materials. Moreover, the meta-material is simple in technology, integrates the structure with the functions, is small in areal density, and can play an important role in the field of target hiding.

The embodiment of the invention provides a control method and device of an inverter and an inverter system. The control method and device of the inverter and the inverter system solve the problems that in a photovoltaic grid-connected electricity generation system, in order to improve the utilization rate of direct current at the two ends of a solar panel for the inverter, common mode components are usually injected into modulating waves of the inverter for three times, and therefore the conversion efficiency of the inverter is low. The control method of the inverter comprises the steps that the voltage of the direct current currently output by a solar panel array connected with the inverter is determined, when the voltage of the direct current is larger than or equal to the current preset voltage, the modulating waves are output to the inverter, the modulating waves only contain periodic waves with a preset frequency, and the modulating waves are used for controlling the inverter to convert the direct current output by the solar panel array into alternating current, and when the inverter converts the direct current with the voltage larger than or equal to the current preset direct current into the alternating current under the control of the modulating waves, the distortion of the alternating current is located in a range currently permitted by a power grid where the inverter is connected into.

Various embodiments of the invention are directed to frequency hopped frequency modulation spread spectrum (FHFMSS) multiple accessing systems and methods. For example, various embodiments of the FHFMSS transmitter may utilize an architecture comprised of a baseband modulation subsystem, a code generation subsystem for generating a multiplicity M code vector sequences, a frequency synthesizer for generating a multiplicity M periodic waveforms, a frequency modulator for generation of a frequency hopped frequency modulation (FHFM) waveform , and a spread spectrum modulator. Various embodiments of the FHFMSS receiver may comprise of a subsystem for generation of the FHFM waveform, a spread spectrum demodulator, a symbol detector, and a baseband demodulation subsystem.

A bottle support system designed for commercial and residential storage of single bottles. The design consists of one or more wavy surfaces that have a section with the shape of a periodic wave, where the distance representing the period of the wave allows bottles to sit in secure manner. The first row of bottles sitting on the wavy surface, creates the base for the second row. Multiple rows can be stacked on each other creating an space efficient bottle storage. This simple and inexpensive design, allows transforming any horizontal surface like a wood shelf, wire-frame shelf or cabinet space into a high density bottle storage, adding strength to the structural base and creating a solid support for several rows of bottles.The bottle support system presented in this invention can accommodate bottles with different diameters and lengths using the same parts.

A self-propelled mechanical crawler adapted to move on a medium. One example of such a crawler includes a foot, a wave generator adapted to drive a periodic wave in the foot, and a wave transfer mechanism coupled between the wave generator and the foot. The wave transfer mechanism may be adapted to translate the periodic wave produced by the wave generator into a corresponding periodic deformation in the foot so as to generate forces in the medium to propel the crawler.

An aquarium system for containing water and aquatic life therein is disclosed that includes a reservoir and an aquarium that is mounted generally above the reservoir. The aquarium has an outlet in liquid communication with the reservoir through an outlet conduit that includes a discharge means, preferably an inverted U-shaped siphon conduit, that periodically discharges a portion of the water from the aquarium to the reservoir therethrough once the water has reached a maximum water level. A pumping means pumps water from the reservoir up to the aquarium through an inlet conduit that is in fluid communication with the reservoir and an inlet of the aquarium. As such, when the water reaches the maximum level in the aquarium, the siphon conduit substantially fills with water which begins to flow out through the outlet conduit, drawing a portion of water from the aquarium rapidly through the outlet conduit until the water in the aquarium reaches the open bottom end of the siphon conduit. Air in the aquarium thereafter enters the siphon conduit to break the siphon. Water leaving the output conduit enters a filter means to filter and clean the water before it is returned to the aquarium by the pump. An embodiment emulating the current of a river, wherein the aquarium takes the shape of an elongated, substantially transparent tube or trough, is further disclosed. A wave surge means may be included for producing periodic wave surges in the aquarium.