18 results about "Wave shape" patented technology

The invention belongs to the field of medical signal processing, particularly provides an eeg high-frequency oscillation signal detecting system based on a convolution neural network, and aims to solve the problem that in a conventional eeg high-frequency oscillation signal detection technique, the false drop rate is high caused by high-frequency noise and peaked wave shape. The eeg high-frequency oscillation signal detecting system comprises a user terminal, a data preprocessing module, a high-frequency oscillation signal predetecting module, the convolution neural network module and a static module, wherein the user terminal is used for acquiring an eeg signal; the data preprocessing module is used for performing data preprocessing; the high-frequency oscillation signal predetecting module is used for performing detection on the eeg signal to obtain suspected high-frequency oscillation fragments; and the convolution neural network module is used for classifying all the suspected high-frequency oscillation fragments. According to the eeg high-frequency oscillation signal detecting system disclosed by the invention, when HFOs are detected, the sensitivity can be effectively improved, the false drop rate is reduced, and the precision rate of epileptogenic focus positioning is increased; and besides, the eeg high-frequency oscillation signal detecting system can use scalp eeg and can also use cortex eeg, so that the egg high-frequency oscillation signal detecting system can enable a doctor to achieve more flexibility.

The invention discloses a wide-dynamic high-accuracy and edge time adjustable impulse wave producing method which is characterized by including the following steps: (1) arranging an impulse generator; (2) building an impulse wave model according to waveforms of impulse signals generated by the impulse generator; (3) determining the amplitude modulation position according to the impulse wave model built in the step (2); (4) arranging an amplitude modulator; (5) setting a field programmable gate array (FPGA) waveform processing unit; (6) arranging a state machine and a direct digital frequency synthesizer (DDS) cooperating with the state machine in work; and (7) leading the state machine and the direct digital frequency synthesizer to cooperate in work and leading details of impulse waveforms after fine adjustment to be completely displayed. The wide-dynamic high-accuracy and edge time adjustable impulse wave producing method uses the method of amplitude for time, leads impulse edges and impulse width to be subjected to wide-dynamic and high-accuracy adjustment completely through the digital measures, simplifies complexity of a signal source analog channel circuit, saves cost and reduces production debugging operation difficulty.

The invention relates to a dry screw compressor host machine rotor shaft sealing structure. The invention is characterized in that an air sealing position is divided into two sealing units by two groups of washers; each sealing unit is provided with two stainless steel sealing rings; a stainless steel wave-shaped spring is arranged between two sealing rings; by virtue of the force of the wave-shaped spring, the end surface of the stainless steel sealing ring can be tightly attached to the washer or shell; meanwhile, when the rotor is rotated, the stainless steel sealing ring is floated on the rotor shaft and an oil retaining ring is sleeved on the rotor shaft. The invention has the advantages of stable sealing performance of the floating ring, reliable operation, long service life, simple manufacture, convenient installation, and low production cost; the floating ring has automatic centering function and the sealing ring is basically not abraded; the invention can effectively block intercommunication of oil and gas, reliably ensures the oil to enter the compression chamber and ensures no oil in the provided pressure gas; the non-contact sealing is adopted, and the sealing can be achieved by the pressure reduction produced in sealed fluid.

Disclosed is a drive circuit for generating the drive current used to energize the windings of a motor. The drive circuit includes a data processing unit that produces two outputs used to control an H-bridge and generation of the drive current. One output, a commutation signal, controls the timing of generation of drive current. The drive current in turn is determined based on the other output, a speed signal. The speed signal waveform includes blanking portions to avoid occurrences of shoot through in the H-bridge.

The invention provides a convenient method for detecting an abnormal waveform. The method is used for a digital oscilloscope and comprises the steps of receiving a group of control information containing measurement control information and a threshold matched with the measurement control information, obtaining a frame of standard waveform data and multiple frames of measurement waveform data from multi-frame recorded measurement waveform data according to the measurement control information, and according to the area between a waveform corresponding to each of the multiple frames of the measurement waveform data and a waveform corresponding to the standard waveform data, displaying the measurement waveform data which correspond to the area and exceed the threshold as abnormal waveform data. By the aid of the convenient method for detecting the abnormal waveform, detection of the abnormal waveform data can be conducted on the recorded measurement waveform data, the abnormal waveform data can be detected quickly and accurately through the area difference between the standard waveform data and the measurement waveform data, and differences between the measurement waveform data and the standard waveform data can be obtained, so that the abnormal waveform data can be analyzed conveniently.

The invention relates to a composite heat-conductive material and a preparation method thereof. The composite heat-conductive material comprises a polymer matrix and carbon nanofiber cloth which is embedded inside the polymer matrix, wherein the carbon nanofiber cloth is arranged perpendicular to the extension direction of the composite heat-conductive material, and is of a wave shape, and the carbon nanofiber cloth is obtained through calcination of an electrospinning film. The carbon nanofiber which is prepared from the electrospinning are combined with metal nanoparticles, a simple low-temperature sintering process is performed so as to form coated carbon nanofiber, a crosslinked heat-conductive skeleton is formed by the carbon nanofiber together with the metal nanoparticles, and the high-heat-conductive material is prepared through compounding of the coated carbon nanofiber with the polymer matrix.

The invention provides a pair of washable multifunctional electric haircutting scissors. The washable multifunctional electric haircutting scissors comprise a machine body assembly, a motor assembly, a cutter bit assembly, a head assembly, a base, a battery, charging pins and a circuit board. The washable multifunctional electric haircutting scissors are characterized in that a rubber ring is arranged in an opening of the head assembly and an opening of the machine body assembly, and the rubber ring is designed in a wave shape, can freely stretch out and draw back and is waterproof; waterproof rings are arranged on the top of a motor, a machine body, the charging pins and screws, and a closed space is formed; and the waterproof effect is achieved by isolating water through the waterproof rings and the rubber ring. According to the technical scheme, maloperation can be effectively avoided, and potential safety hazards are reduced; the head angle better conforms to human engineering, and the scissors are more effectively attached to human skin through the head angle; meanwhile, use is more convenient, and the service life of the haircutting scissors is prolonged; cleaning of the haircutting scissors is facilitated through the washable function, so that danger of bacteria to the human skin is eliminated; and meanwhile a charging base is provided with positions for containing an oil bottle and a brush, and management and use of accessories are convenient.

A 12-bit A/D converter card is composed of analog multi-channel switch, A/D converter, single-chip processor PIC16, photoelectric isolating circuit, FIFO memory, and programmable GAL logic circuit. The single-chip processor is used to control the timing of A/D conversion and FIFO memory is used as data buffer for visualized programming control in windows operating system. The correct timing sample can be realized without interruption. The waveform of the signal sampled can be real-time displayed. Its advantages high safety and reliability, convenient application and wide adaptability.

The invention relates to the field of textile fabrics, in particular to a computer keyboard dustproof cover fabric convenient to disassemble and wash. The dustproof cover fabric can effectively achieve a dustproof effect on a keyboard by zipping up a zipper, and the dustproof cover fabric is convenient to disassemble and wash. The fabric structurally comprises a first fabric main body with an arc-shaped upper part and a second fabric main body with an arc-shaped lower part, and the first fabric main body and the second fabric main body are zipped through a zipper; a heart-shaped storage bag isfurther fixedly arranged on the upper surface of the right end of the first fabric body, and a zipper opening is formed in one side of the heart-shaped storage bag, and a plurality of wave-shaped bulges are fixedly arranged on the upper surface of the first fabric main body. The device is simple in structure, is convenient to use and is suitable for various places.

The invention discloses a high performance fiber composite guardrail, which is prepared from, by weight, 60-100 parts of high performance fiber and 70-100 parts of binder. The high performance fiber composite guardrail adopts a novel compound material-ultra high molecular weight polyethylene fiber, combining the idea of half rigidity and flexible protection. The shape follows the wave shape or other shapes, but the material is different from materials of other guardrails. The high performance fiber composite guardrail prevents drivers and cars from getting hard injury and secondary damage when a car accident happens.

The invention relates to a serial capacitor operation control device and method for a single-phase permanent magnet synchronous generator. The device includes two orthogonal windings and a load; a capacitor C1, a capacitor C2 and a capacitor C3 connected with one of the orthogonal winding; a bidirectional thyristor T1, a bidirectional thyristor T2 and a bidirectional thyristor T3 connected with the capacitor C1, the capacitor C2 and the capacitor C3 correspondingly and used for controlling the capacitors to connect to circuits. The device also includes a voltage-current detection conditioningcircuit, an A/D conversion circuit, a single-chip microprocessor control circuit, a thyristor triggering control circuit, a zero cross detection circuit, a Hall voltage sensor, a Hall current sensor,a linear optical coupler and a phase inverter. By adopting the technical scheme provided by the invention, defects of generator vibration and severe voltage waveform distortion due to generation of pulse vibration magnetomotive force of the single-phase motor and generator vibration and low power generation efficiency caused by magnetomotive force having ovality difference generated in an electrification process of the two-phase armature windings can be made up.

The invention discloses a strip-shaped balcony lamp. The strip-shaped balcony lamp comprises a lamp body, an aluminum substrate, an LED power circuit, an LED power and a light-transmitting plate, wherein a lamp cavity with a lower opening and an annular base which is perpendicular and is around the lamp cavity are arranged on the lamp body; the LED power circuit is integrated on the aluminum substrate; the aluminum substrate, the LED power and the LED power circuit form an LED linear module; the strip-shaped balcony lamp further comprises a decorative fixed ring; a buckle hook is arranged on an edge of an upper end surface of the decorative fixed ring; a step is arranged on the lower part of the lamp cavity of the lamp body; a buckle hook hole is formed in the step; the lamp cavity is step-shaped; a wave-shaped boss is arranged on the outer surface of the light-transmitting plate, or the light-transmitting plate is a diffusion plate; the aluminum substrate is fixed on a top plate of the lamp cavity; the light-transmitting plate is arranged on the decorative fixed ring; the buckle hook penetrates through the buckle hook hole and is buckled with the step; and the light-transmitting plate clings to the step. Strip is applicable to the shapes of modern balconies; the aluminum substrate is fixedly connected with the top plate of the lamp cavity; the light-transmitting plate is fixedly connected with the lamp cavity through the decorative fixed ring; assembly is convenient; a top fixed plate strip is detachably matched with the lamp body; and installation is convenient.

The invention discloses a bionic adhesion-reducing resistance-reducing kneading machine. The bionic adhesion-reducing resistance-reducing kneading machine comprises a motor, a speed transmission, kneading rollers, a mixing barrel, kneading blades, an end cover and a machine base, wherein grid structures which are similar with the microstructure of the front side of a corn leaf are processed on the surfaces of the kneading blades and the inner wall surface of the mixing barrel by a laser engraving method; the grid structures comprise transverse ribs and longitudinal ribs, which are in staggered arrangement; top ends of the transverse ribs and top ends of the longitudinal ribs are all provided with wave-shaped semicircular convex structures; the transverse ribs and the longitudinal ribs are perpendicular to each other, and are same in size and spacing; and the bionic grid structures can effectively reduce the adhesion of high-viscosity materials to the kneading machine. According to the bionic adhesion-reducing resistance-reducing kneading machine disclosed by the invention, the material to be kneaded cannot be in sufficient contact with the kneading blades and the inner wall of the mixing barrel, so that the adhesion quality is reduced, besides, the working resistance of the kneading blades is reduced, and the corrosion of the inner wall of the mixing barrel by the material is reduced; and therefore, the service life of the kneading machine is prolonged.

The invention provides a signal transmitting method and a signal receiving method based on TDCS (Transform Domain Communication System) differential transmission. The method comprises the following steps: acquiring a first frequency domain basic waveform vector and a second frequency domain basic waveform vector respectively by using a first frequency spectrum mask sequence as well as a first random phase complex sequence and a second random phase complex sequence which are independent of each other; performing inverse fast Fourier transform on the first frequency domain basic waveform vector and the second frequency domain basic waveform vector to obtain a first path basic modulation waveform and a second path basic modulation waveform of a time domain; extracting k bits of bit data to be transmitted, and acquiring the decimal system mapping value of the k bits of bit data to be transmitted according to a rightmost bit as highest bit principle; randomly acquiring a first decimal numeral and a second decimal numeral; acquiring a first path modulation waveform and a second path modulation waveform through shift circulation modulation; synthesizing the first path modulation waveform and the second path modulation waveform to obtain a transmission signal, and transmitting the transmission signal by using an orthogonal frequency-division multiplexing transmission module.

The invention discloses a speech synthesis method capable of being used for a chip end. The speech synthesis method comprises the following steps: step 1, calculating a pulse excitation seed signal and a noise excitation seed signal; step 2, solving an excitation signal according to the fundamental frequency F0 of the given voice and the band-shaped aperiodic ratio ap; and step 3, for each frame of frequency spectrum envelope of the given audio, calculating corresponding audio data, and then performing superposition according to frame shift to obtain a final voice waveform. According to the method, the required pulse excitation seed signal is calculated off line in advance, only multiplication and addition operation is performed when periodic excitation and non-periodic excitation are calculated, Fourier transform and inverse Fourier transform are not involved, and the operation speed of the vocoder at a chip end is increased.