13 results about "Bipolar signal" patented technology

The embodiment of the invention provides an automatic gain control system and method based on a casing coupling positioning signal. The system is applied to the field of petroleum perforation engineering and comprises an analog front end, a prediction module, a master control module and a bus, and the analog front end comprises an over-temperature protection circuit, an over-current protection circuit, a level translation circuit, a buffer, a programmable amplification circuit and a filter circuit; wherein the level translation circuit is used for converting a bipolar signal into a unipolar signal; the buffer is used for isolating front-stage and rear-stage circuits; the programmable amplification circuit is used for adjusting a gain coefficient; the filter circuit is used for suppressing noise signals; the prediction module is used for pre-judging the voltage amplitude of the casing coupling positioning signal according to the real-time falling speed of the perforating gun; and the main control module is used for processing the falling speed data of the perforating gun, calling the prediction module to output a pre-judgment voltage value, matching an optimal gain coefficient according to the pre-judgment voltage value, and outputting a control instruction to the programmable amplification circuit through a bus, so that the quality of perforating data is improved.

An electrosurgical system having an electrosurgical device, an accessory charging circuit, and an electrosurgical unit is disclosed. The electrosurgical device is operable in at least one of a monopolar mode and a bipolar mode. The electrosurgical unit electrically is coupled to the electrosurgical device and the accessory charging circuit. The electrosurgical unit provides one of a monopolar RF energy signal and a bipolar RF energy signal to the electrosurgical device corresponds with an activated mode and a bipolar signal to the accessory charging circuit.

A method of training a hierarchical neural network in hardware comprising a plurality of neurons having tree structure connections between respective ones of the plurality of neurons to compute plausible inferences based on input data. The method includes initiating a WTA neuron ensemble to connect to data input neurons and produce a winner-take-all, attaching data records match with top neurons and branching out at WTA junctions to form a hierarchy network tree, converting a stream of the input data into neuron bipolar signals, updating neuron weights with Hebbian and anti-Hebbian rules, and repeating the attaching, converting, and updating until the input data is exhausted.

This invention belongs to the field of antibiotic detection technology. It relates to a photoelectric active material with a P-N covalent bond-bridged heterojunction, its preparation method, and its applications. The RP / g-C3N4 P-N type chemically bonded heterojunction photochemical sensing material prepared by this method benefits from the unique band structure electric field response properties of g-C3N4. Under adjusted bias voltage conditions, this heterojunction material excites a dual-channel photocurrent response at both the anode and cathode, forming a self-detecting signal mechanism. The construction of P-N interface chemical bonds not only provides an efficient directional transport channel for photogenerated electrons but also enhances the structural stability of the system through stress buffering. In summary, the synergistic design of the engineering strategy based on P-N interface bonding bridging and the single-system bipolar signal detection mechanism overcomes the detection limitations of traditional single-channel PEC sensors, significantly improving signal reliability and anti-interference capabilities, and endowing the sensor with wider application adaptability and higher detection confidence.

The utility model provides a positive and negative voltage acquisition circuit for a single-power ADC system. The positive and negative voltage acquisition circuit comprises a main controller, an analog-to-digital conversion circuit, a signal amplification circuit, a biasing circuit and a filter circuit. The connector is connected with the signal amplification circuit and is used for transmitting the RCV signal; the signal amplification circuit is connected with the biasing circuit and is used for adjusting the amplitude of the signal; the biasing circuit is connected with the filter circuit and is used for eliminating interference to obtain an ideal sampling signal; the filter circuit is connected with the analog-to-digital conversion circuit and is used for converting the analog quantity into digital information collected by the main controller; and the main controller performs reading through a bus and is used for realizing closed-loop control. According to the utility model, bipolar signals are modulated into unipolar signals through circuit design, so that the integrity of the signals is ensured. Tiny signals are amplified to a proper amplitude, and the signal acquisition precision is improved. A mainstream single-power ADC chip is adopted, and compared with a dual-power ADC chip, the design cost is greatly reduced.

This invention is entitled "Detection of Ventricular Activity Using Unipolar and Bipolar Signals". The invention relates to a method comprising receiving a bipolar signal sensed by a pair of electrodes at a location in a patient's heart; receiving a unipolar signal sensed by the electrodes at that location in the heart; calculating the derivative of the received bipolar signal; calculating the derivative of the received unipolar signal; evaluating the ratio between the derivative of the bipolar signal and the derivative of the unipolar signal at a local minimum of the derivative of the unipolar signal; and indicating ventricular activity when this ratio is less than a preset threshold ratio.

This invention discloses a rapid primary field shutdown circuit and device for the electric source transient electromagnetic method. The rapid primary field shutdown circuit includes a control circuit, a power supply, an inverter circuit, a first output terminal, a second output terminal, a third output terminal, a fourth output terminal, a first switching circuit, and a second switching circuit. The inverter circuit is connected to the control circuit, the first output terminal, the second output terminal, the power supply, the third output terminal, the fourth output terminal, the first switching circuit, and the second switching circuit. This invention addresses the technical problem of the self-induced electromotive force during the turn-off time of the bipolar signal affecting the exploration results of the secondary field signal in time-domain electromagnetic exploration.

Medical apparatus includes a probe with a basket assembly at its distal end, including a plurality of resilient spines with multiple electrodes arrayed along a length of each of the spines. Processing circuitry is configured to acquire a first bipolar electrical signal from the tissue between first and second electrodes at first and second locations along a first spine of the basket assembly, and to acquire a second bipolar electrical signal from the tissue between the first electrode and a third electrode in a third location on a second spine of the basket assembly, and to interpolate, based on the first and second bipolar electrical signals, a vectorial electrical property of the tissue along an axis that passes through the first location and between the second and third locations.

The application discloses a kind of electromyographic signal processing method, system and equipment for stroke patient rehabilitation training, belong to rehabilitation medical electronics technical field.Method includes: through three acquisition point serpentine grid flexible FPC electrode to obtain differential signal and reference signal, RF interference is filtered out by RFI filter;Signal is processed using three operational amplifier instrument amplifiers: first stage instrument amplifier suppresses common-mode interference and realizes primary filtering, second stage two-order active filter constitutes three-pole bandpass characteristic, and output signal amplitude is amplified to 2 / 3 of ADC range accurately;Direct current bias voltage generated by reference signal is superimposed with amplified signal, and bipolar signal is stabilized to the input range of adaptive ADC is converted by 24-bit ADC;It is transmitted to terminal by self-defined bluetooth protocol, and real-time generation electromyographic power spectral density analysis and rehabilitation quantization report.The technical scheme of the present application can effectively limit the signal band in the main energy range of electromyographic signal, filter out high-frequency noise and motion artifacts in addition to muscle signal.

A method includes receiving a bipolar signal sensed by a pair of electrodes at a location in a heart of a patient. One or more electrocardiogram (ECG) signals are received, sensed by body-surface electrodes attached to the patient. Two or more successive QRS complexes are identified in the bipolar signal. One or more activations are detected in the bipolar signal, which occur within a window-of-interest that begins at least a given time with respect to the identified QRS complexes. The detected activations are checked whether they are late potentials, by verifying whether (i) the activations do not coincide with a predefined event observed in the ECG signals, and (ii) the activations are repeatable in the successive QRS complexes. In response to deciding that at least one of the detected activations is a late potential, the latest of the at least one of the late potentials is visualized to a user.

The invention discloses a dispersion pre-compensation method for a bipolar pulse amplitude modulation direct detection system, and relates to the technical field of optical fiber communication. The method comprises the following steps: performing triple oversampling on an original bipolar PAM signal to generate an oversampling signal of three samples per symbol; carrying out iterative processing on the signal based on an improved Gilbert-Saxon algorithm to generate a dispersion pre-compensated transmitting signal, wherein the iterative process comprises receiving end amplitude constraint, inverse dispersion transformation, transmitting end real part constraint and positive dispersion transformation; the compensated signal is modulated to an optical carrier and transmitted through an optical fiber; and recovering amplitude and phase difference information at a receiving end by using a specific sample. The limitation of optical fiber dispersion on the performance of a BPAM direct detection system is effectively overcome through pre-compensation, the transmission distance and the energy efficiency of the system are remarkably improved, and the method is particularly suitable for short-distance optical interconnection application.

A method includes receiving a bipolar signal sensed by a pair of electrodes at a location in a heart of a patient. One or more electrocardiogram (ECG) signals are received, sensed by body-surface electrodes attached to the patient. Two or more successive QRS complexes are identified in the bipolar signal. One or more activations are detected in the bipolar signal, which occur within a window-of-interest that begins at least a given time with respect to the identified QRS complexes. The detected activations are checked whether they are late potentials, by verifying whether (i) the activations do not coincide with a predefined event observed in the ECG signals, and (ii) the activations are repeatable in the successive QRS complexes. In response to deciding that at least one of the detected activations is a late potential, the latest of the at least one of the late potentials is visualized to a user.