9 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.

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 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.

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 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.