17 results about "Rectangular pulse" patented technology

Systems and methods are described for controlling a low frequency (LF) radio frequency (RF) pulse generator to enhance selectivity. One method includes controlling the LF RF pulse generator to generate a plurality of rectangular pulses interspersed with a plurality of rectangular sub-pulses, each of the plurality of rectangular pulses having a first sub-pulse width greater than a second sub-pulse width of each of the plurality of rectangular sub-pulses.

An improved method for generating electromagnetic fields by low frequency current pulses to treat body parts of a living organism is proposed. [Solution] The present invention relates to a method for generating an electromagnetic field by a generator (5) in an applicator (5) using low-frequency current pulses (10). Furthermore, a plurality of current pulses (10) according to a signal progression are generated. Each current pulse (10) has a first signal component in the form of a rectangular pulse. A current pulse pause (16) is provided between two current pulses (10). The amplitude of the current pulses (10) is modulated at the modulation frequency of the sinusoidal signal progression. Furthermore, the present invention relates to a device for carrying out this method.

The application discloses a pulse top drop compensation circuit of a Marx generator based on a resonance circuit, and comprises: compensation of pulse top drop under different loads and different pulse widths. In applications such as particle accelerators, the voltage and current top drop of a high-voltage pulse should be as low as possible; in the Marx generator, when the resonance inductance and the compensation switch are connected in series and are connected in parallel with the main capacitor in the common unit, the compensation unit is obtained. In the discharge process, the nearly linear part of the sine voltage is added to the load as pulse compensation, and a nearly top-drop-free rectangular pulse is realized. Different compensation unit numbers can compensate the voltage top drop to different degrees, and the compensation effect is adjustable. In addition, as long as the resonance control switch is turned off, the compensation units can also work as common units in the Marx generator, so as to be utilized. According to the application, the compensation degree can be adjusted, the capacitance and the system cost can be greatly reduced, and good feasibility and application prospect are possessed.

Method for generating a pulse (7, 9; 207, 209; 307, 309; 407, 409), wherein a predetermined first boundary curve (3) and a predetermined second boundary curve (5) are defined for a pulse shape of the pulse (7, 9; 207, 209; 307, 309; 407, 409), wherein the boundary curves (3, 5) describe the time course of a current quantity (I), and wherein the second boundary curve (5) lies completely within the first boundary curve (3), characterized in that a curve inscribed between the boundary curves (3, 5) is generated as the pulse shape for the pulse (7, 9; 207, 209; 307, 309; 407, 409) by means of a current sink (37), which – compared to a rectangular pulse inscribed between the boundary curves (3, 5) – is located in a first region of the current quantity that is away from an extremum. (I) is deformed towards the first limit curve (3), and in a second region of the current quantity (I) facing the extremum is deformed towards the second limit curve (5).

Systems and methods are described for controlling the pulse width of a rectangular pulse waveform. One of the methods includes generating a rectangular pulse waveform having multiple states, each of the multiple states including a series of rectangular pulses. The method includes modifying the pulse width of each of the multiple states to modify the rate at which a substrate is processed.

The invention relates to the technical field of motor control, and discloses a motor parameter identification method based on finite width rectangular pulse excitation. Comprising the following steps: S01, generating a pulse signal; s02, judging whether to enter a recursive calculation mode or not; s03, based on a static setting principle or a dynamic adjustment principle, calculating a steady-state amplification factor and a time constant of the to-be-tested motor at a sampling moment; s04, whether excitation response output operation is executed or not is judged; s05, outputting a steady-state amplification factor and a time constant of the to-be-tested motor at a standard moment; according to the invention, it can be ensured that the pulse signal interacts with the to-be-tested motor in an extremely short time, so that the interference influence caused by the long-time excitation action of the pulse signal and the to-be-tested motor is avoided; two parallel calculation identification logics are provided for accurate calculation of the steady-state amplification factor and the time constant, and the compatibility between the motor parameter calculation identification logics and single-chip microcomputers with different performances is improved.

The invention discloses a nuclear pulse rectangle forming method of a digital nuclear energy spectrum measurement system. Aiming at a digital nuclear energy spectrum measurement system using a scintillator detector, the method does not adopt nuclear pulse amplitude to represent incident particle energy, but solves the incident particle energy according to an area formula of discrete time signals, then takes an energy value as rectangular amplitude in a time domain, and can form a rectangular pulse with adjustable bottom width through simple operation. And the original nuclear pulse data are converted into rectangular waves formed by rectangles. Compared with a classical nuclear pulse forming method, the rectangle forming method does not need complex operation such as a z transformation method, a convolution method or a recursion method, is small in design difficulty, small in calculation amount, low in cost and easy to implement in a digital chip, and can exert the performance of the scintillator detector to the maximum extent.

The utility model relates to the technical field of beauty instruments, and discloses a function multiplexing pulse signal output circuit and a beauty instrument, and the circuit comprises a rectangular pulse signal generation module which is used for generating a rectangular pulse signal; the rectangular pulse signal shaping module is used for converting the rectangular pulse signal into a positive and negative symmetric rectangular pulse signal; the first function control module is used for outputting positive and negative symmetric rectangular pulse signals to the first metal electrode; the second function control module is used for converting the positive and negative symmetrical rectangular pulse signals into sine pulse signals and outputting the sine pulse signals to the second metal electrode; and the control module is used for conducting the rectangular pulse signal generation module, the rectangular pulse signal shaping module and the first function control module to execute a leading-in function, or conducting the rectangular pulse signal generation module, the rectangular pulse signal shaping module and the second function control module to execute a micro-current function. Function multiplexing of the beauty instrument can be realized based on the same circuit, the circuit composition is simplified, and the cost is reduced.

The invention discloses an emergency rescue one-way wireless through-the-earth communication method based on a transient detection device. A receiver of the transient detection device is arranged on the ground, and in the 1: 1 receiving and non-receiving time periods, continuous bipolar rectangular pulses with the duty ratio being 1: 1 emitted by an underground signal generator are received. The receiving period and the transmitting period are the same and are even times of the power frequency period, so that underground signals are highlighted through reverse superposition, power frequency noise is weakened, and the signal-to-noise ratio of an emergency rescue channel is improved. By recording the position and the transmitting period of the underground signal generator, the underground personnel can be positioned without encoding and decoding, and the wireless through-the-earth communication system is a wireless through-the-earth communication mode which can be timely deployed on site and nearby in the underground emergency rescue of the mine.

Apparatus and methods for interfacing an integrated qubit control chip and a solid state qubit; detecting a qubit state with a transition pulse histogram; high resolution and high speed rectangular pulse generation; large-scale spin qubit state readout; and activity-based clock control.

The application discloses a time-varying modulation opportunity array radar pattern synthesis method and belongs to the opportunity array radar field. The method comprises the following steps: constructing an opportunity array radar array pattern target function with the minimum side lobe peak level and first-order sideband level as the target, constructing a fuzzy opportunity constraint condition with a subarray position state, a subarray quantity and an array element time sequence in each subarray, obtaining a fuzzy opportunity constraint programming model of the opportunity array radar pattern synthesis, and optimizing and solving the fuzzy opportunity constraint programming model based on an adaptive differential evolution algorithm under the chaos elite and center guide thought to obtain the best array element switch time sequence and position. The trapezoidal pulse modulation is adopted in the application, and compared with the traditional rectangular pulse, the frequency spectrum energy distribution is more efficient; and through the fuzzy opportunity constraint programming model, the direction pattern synthesis can be completed by using 30%-70% of the subarray quantity in the confidence water time, and resource waste is reduced.

The present invention relates to the generation of electromagnetic fields by an applicator (5) with low-frequency current pulses (10) by a generator (3) which generates the low-frequency current pulses (10) for generating the electromagnetic fields, wherein a plurality of current pulses (10) follow a signal curve, wherein the respective current pulse (10) comprises a first signal component in the form of a rectangular pulse, wherein a current pulse pause (16) is provided between two current pulses (10), and wherein the amplitude of the current pulses (10) is modulated with a modulation frequency in a sinusoidal signal curve. Furthermore, the present invention relates to a device for carrying out the method.

The embodiment of the invention provides a 2M coaxial cable detection method, device and equipment. The method comprises the following steps: when an initial test result of double-end detection on a to-be-detected cable represents that the to-be-detected cable is in a short-circuit state or an open-circuit state, sending a characteristic pulse signal to the to-be-detected cable in response to an operation of single-end detection on the to-be-detected cable by a user, the characteristic pulse signal is determined according to a preset pulse peak value, a rectangular pulse under a preset pulse width and a unit pulse sequence; receiving a reflected wave signal fed back by the to-be-detected cable based on the characteristic pulse signal; determining the voltage amplitude of the reflected wave signal according to the reflected wave signal and the load impedance and the characteristic impedance of the cable to be detected; and determining and displaying a detection result of the to-be-detected cable according to the voltage amplitude of the reflected wave signal. The method is used for achieving the effect of improving the detection accuracy.

The application discloses a kind of for FMCW millimeter wave radar slice reconstruction interference suppression method and system, this method is mainly based on short-time Fourier transform and time-frequency domain filter to realize inhibition;After radar transmitter sends radio frequency signal, radio frequency signal is intercepted by jammer, and the signal intercepted by jammer is truncated with equidistant rectangular pulse;Afterwards, the slice generated by truncation is filled according to certain rule to fill the entire time gap, after filling, interference signal is generated, and then the interference signal is transmitted;The interference signal and target echo signal enter radar receiver simultaneously to form retransmission jamming.The short-time Fourier transform is carried out on echo intermediate frequency signal in the application, time-frequency domain is obtained, then binary mask filtering is carried out on time-frequency domain to remove the false target interference, interference suppression can be realized under three C&I interference forms, and in the case of JSR≤40dB, with the advantages of fast response speed, high anti-interference efficiency.

The invention discloses a quadrupole nuclear two-dimensional high-resolution solid NMR method based on five-quantum excitation enhancement, and the method comprises the steps: carrying out the optimization of a frequency offset satellite transition selective flip pulse based on a first change hill climbing algorithm, obtaining an LP-opt pulse, designing an LP-opt 5QMAS pulse sequence, and carrying out the time sequence of the LP-opt 5QMAS pulse sequence, the method sequentially comprises a layout number transfer enhancement pulse, a first center transition selective excitation pulse, a first LP-opt pulse, a second LP-opt pulse, a second center transition selective excitation pulse and a third center transition selective excitation pulse. According to the invention, high-order quantum transition effective excitation which is difficult to excite by a traditional rectangular pulse method is realized. Especially for a nuclear spin system with a large nuclear quadrupole interaction constant (CQ) generated due to asymmetry of a local structure, the five-quantum excitation material shows excellent five-quantum excitation efficiency in a 5QMAS experiment.

The invention discloses a TMA multi-beam control method based on rectangular pulse combination, and belongs to the field of time modulation arrays. According to the invention, the problems of high hardware structure complexity and poor beam control flexibility of the existing multi-beam control method are solved. Based on a simple rectangular pulse combination form, only a radio frequency switch and a phase shifter which are easier to realize are needed in hardware, and multi-beam flexible regulation and control of the TMA can be realized in a low-complexity hardware architecture; the problem that a traditional TMA-based multi-beam forming algorithm needs to use an attenuator and a phase shifter at the same time to achieve a complex modulation function and is high in hardware complexity is solved, and the hardware complexity needed by a system is greatly reduced on the premise that multi-beam flexible regulation and control of the TMA are achieved. The method can be applied to TMA multi-beam control.

According to the parameter extraction method of the resistance simulation model, the voltage parameter of the resistance simulation unit is extracted from the resistance values of the sample resistor obtained under the rectangular pulses with different amplitudes, and the requirement for rectangular pulse measurement is low, so that the measurement accuracy is improved. The mode of extracting the voltage parameter through the rectangular pulse is simple. Besides, the time of the rectangular pulse is short, so that the self-heating effect of the resistor cannot be caused when the rectangular pulse is applied to the sample resistor, and the extracted voltage parameter is more accurate.