28 results about "Bipolar signal" patented technology

The invention provides an audio playing method and an audio playing circuit, and relates to the technical field of audio playing. The audio playing method comprises the following steps: converting audio data into a complementary PWM (Pulse Width Modulation) signal and transmitting the complementary PWM signal to a full-bridge module by utilizing a controller; the full-bridge module is controlled to output a bipolar PWM signal after receiving the complementary PWM signal, and the full-bridge module is provided with a field effect transistor acting based on the complementary PWM signal; and filtering high-frequency signals in the bipolar PWM signals by using a low-pass filtering module to obtain audio signals for playing. According to the embodiment of the invention, the full-bridge module can be controlled to work in a PWM control mode, so that the field effect transistor works in a fully-on or fully-off switching state, the energy conversion efficiency is improved, and the overall power consumption of the circuit is effectively reduced.

The invention discloses a digital-to-analog conversion circuit and a conversion method, and belongs to the field of circuit design. In order to solve the problems that the output amplitude of an existing digital-to-analog converter is fixed, and the resolution needs to be sacrificed or an additional circuit needs to be added during amplitude adjustment, the invention provides a novel circuit structure. On the basis that the circuit comprises a digital output module, a switch module and a weight circuit module, a high-level adjustable reference source and a low-level adjustable reference source are innovatively introduced. The switch module selectively connects the input node of the weight circuit module to the two adjustable reference sources according to the control signal of the digital output module. Therefore, the amplitude and the direct current bias of the output analog signal are directly determined by the voltage values of the two reference sources. According to the invention, the output signal range can be dynamically and flexibly adjusted on the premise that the resolution is not lost, and the bipolar signal can be conveniently generated, so that the system design is simplified, and the cost is reduced.

The invention discloses a pregnancy prediction method and device based on a dynamic time warping algorithm, and the method comprises the steps: 1), obtaining an original 16-channel EHG signal, carrying out the preprocessing, obtaining a 12 * 12 bipolar signal, dividing a uterine contraction window, and obtaining an EHG signal of a uterine contraction segment corresponding to a TOCO signal; 2) for 12 * 12 bipolar signals, calculating the DTW distance between different bipolar signals by using a dynamic time warping algorithm, measuring the similarity between the signals through the DTW distance, obtaining a 12 * 12 DTW matrix, and visualizing the 12 * 12 DTW matrix; 3) according to the DTW matrixes of different subjects in different pregnancy periods, evaluating changes of the visual DTW matrixes of different subjects in different pregnancy periods; observing how the average DTW distance between the electrodes in the horizontal and vertical directions varies with the progression of pregnancy; evaluating the difference between the average DTW distance in the horizontal direction and the average DTW distance in the vertical direction; and 4) taking the DTW matrix obtained in the step 2) as a feature, dividing a data set into a training set and a test set, combining a real label, performing pregnancy prediction by using a support vector machine (SVM), and verifying the effectiveness of the DTW distance in pregnancy prediction.

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.

The utility model relates to the technical field of water meters, in particular to a novel bipolar signaling pointer water meter, which is characterized in that a turning cover is arranged on one side of the top surface of a control box, an upper cover is arranged on the other side of the top surface of the control box, a movement is arranged in a copper shell below the control box, a stainless steel cover is arranged on the periphery of the movement, and a glass cover is arranged above the movement. A sealing gasket is arranged between the glass cover and the stainless steel cover, a bipolar pointer is arranged on the upper surface of the movement, a main board module bin is arranged in the control box below the upper cover, a control main board is arranged on the main board module bin, an electromechanical sensor is connected to one side of the main board module bin and located over the bipolar pointer, and the control main board is arranged on the electromechanical sensor. According to the utility model, the bipolar pointers are adopted to replace the traditional semi-metalized disc pointers, so that the water consumption of the water meter in forward and reverse rotation is calculated, the influence of vibration on metering is not required to be worried, and the water meter is more sensitive and has higher resistance to obstruction and interference resistance.

The invention discloses a steering column signal acquisition and conversion device and a signal processing method thereof. The device mainly comprises a displacement signal processing module, a main control processing module and a communication module. The displacement signal processing module carries out buffer isolation, voltage and current conversion and signal conditioning on a bipolar analog signal output by a steering column displacement sensor through a three-stage structure of a voltage follower, a Hall voltage sensor and an anti-phase adder, and finally converts the bipolar analog signal into a unipolar voltage signal adaptive to an ADC interface of the main control processing module. The problems of easy signal distortion, poor anti-interference capability and bipolar signal compatibility of a traditional scheme are effectively solved. The master control processing module is responsible for collecting conditioned signals and packing data, and the communication module achieves anti-interference long-distance data transmission with an upper computer in a differential bus communication mode. According to the invention, the precision, stability and system reliability of signal acquisition of the steering column are remarkably improved, and the system is suitable for application scenes with high-performance requirements such as maintenance simulation training and the like.

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.

The subject technology is directed to power conversion systems and methods. In some embodiments, the subject technology provides a device comprising a first switch configured to receive a first signal and a second switch configured to receive a second signal. A voltage generator is coupled to the first switch. The device further comprises a first resistor coupled to the first switch and a second resistor coupled to the first resistor. The first switch is further coupled to a first capacitor, which acts as a charge pump to generate the negative voltage such that the output of the device comprises both positive and negative voltages. Embodiments of the subject technology achieve bipolar signaling based on a unipolar design, effectively minimizing DC leakage and overall power consumption. There are other embodiments as well.

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 invention provides a signal conversion circuit capable of changing unipolar control into bipolar control. The signal conversion circuit comprises a time delay circuit and a level conversion circuit, the delay circuit comprises a capacitor and a first resistor which are connected in parallel, one ends of the capacitor and the first resistor are electrically connected to the first signal line, and the other ends are grounded; the level conversion circuit comprises a triode, the base electrode of the triode is electrically connected with a second signal line, the collector electrode of the triode is electrically connected with one end of a second resistor, the other end of the second resistor is electrically connected with the positive electrode of the control electrode, the emitter electrode of the triode is electrically connected with one end of a third resistor, and the other end of the third resistor is grounded. The collector electrode of the triode is electrically connected with an output signal line. Synchronization of bipolar control signals is achieved through the time delay circuit, and the situation that the circuit cannot work normally due to the fact that bipolar signals are not synchronous is avoided. And level conversion is realized through switching on and switching off of the triodes, single-pole control is changed into double-pole control, and the stability of control signals is effectively improved.

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.

The application discloses a kind of driving rod signal acquisition and conversion device and its signal processing method, device mainly includes displacement signal processing module, main control processing module and communication module.Displacement signal processing module is by voltage follower, Hall voltage sensor and three-level structure of inverting adder, the bipolar analog signal output by driving rod displacement sensor is buffered isolation, voltage current conversion and signal conditioning, finally converted into single voltage signal suitable for the ADC interface of main control processing module, effectively solve the traditional scheme signal distortion, poor anti-interference ability and bipolar signal compatibility problem.Main control processing module is responsible for the signal after acquisition conditioning and carries out data packing, communication module uses differential bus communication mode to realize and the anti-interference long-distance data transmission of host computer.The application significantly improves the precision, stability and system reliability of driving rod signal acquisition, is applicable to the application scene of high performance requirement such as maintenance simulation training.

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 present invention is titled "Expansion of Electrocardiogram (ECG) Acquisition Capability of a Catheter-Based Cardiac System". The present invention discloses a method, including receiving an analog body surface signal from a body surface electrode and a plurality of analog unipolar signals from a plurality of unipolar electrodes of an invasive probe. Designating a first unipolar electrode to serve as a common electrical ground and a common timing reference for the analog unipolar signals and the analog body surface signal. Digitizing the analog unipolar signals to generate digital unipolar signals sampled with respect to a digital ground. Defining an analog bipolar signal between the first unipolar electrode and a second unipolar electrode of the probe and a digital bipolar signal formed by the first unipolar electrode and the second unipolar electrode. During the connection of the first unipolar electrode to the digital ground, estimating a ground offset and a timing offset between the analog bipolar signal and the digital bipolar signal. Applying the ground offset and the timing offset to measure a third unipolar signal sensed by a third unipolar electrode.

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.

The invention provides a signal synthesis device, radio frequency power supply equipment and a radio frequency power supply system, the signal synthesis device comprises an input end, a phase shift unit, a signal synthesis unit and an output end, and the input end is used for inputting a reference signal. The phase shift unit is connected between the input end and the signal synthesis unit, the phase shift unit is used for receiving a reference signal and performing phase shift according to the reference signal to obtain a first phase shift signal, a second phase shift signal and a third phase shift signal, the sum of the phase shift angles of the first phase shift signal, the second phase shift signal and the third phase shift signal is equal to an integral multiple of 360 degrees. And the signal synthesis unit is connected with the output end and is used for synthesizing the first phase shift signal, the second phase shift signal and the third phase shift signal to obtain a target signal. Wherein the reference signal and the target signal are both periodic bipolar signals, and the frequency of the target signal is higher than that of the reference signal. According to the invention, the signal frequency can be improved at low cost.

The invention discloses an electromyographic signal processing method, system and equipment for rehabilitation training of a stroke patient, and belongs to the technical field of rehabilitation medical electronics. The method comprises the following steps: acquiring a differential signal and a reference signal through a three-acquisition-point snakelike grid flexible FPC electrode, and filtering radio frequency interference through an RFI filter; a first-stage instrumentation amplifier suppresses common-mode interference and realizes primary filtering, a second-stage second-order active filter forms a three-pole band-pass characteristic, and the amplitude of an output signal is accurately amplified to 2 / 3 of the range of an ADC (Analog to Digital Converter); the direct current bias voltage generated by the reference signal is superposed with the amplification signal, and the bipolar signal is stabilized to the input range of the adaptive ADC and is converted by the 24-bit ADC; transmitting to a terminal through a self-defined Bluetooth protocol, and generating an electromyographic power spectral density analysis and rehabilitation quantification report in real time. According to the technical scheme, the signal frequency band can be effectively limited within the main energy range of the electromyographic signals, and high-frequency noise and motion artifacts except for the electromyographic signals are filtered out.

A method includes acquiring intracardiac unipolar signals and intracardiac bipolar signals at a given region of a heart of a patient. The unipolar signals are pruned by eliminating ones of the unipolar signals that correspond in time to respective bipolar signals. One or more unipolar signals are identified among the pruned unipolar signals, that are associated with far-field P-waves. Using the identified P-waves, a window of interest (WOI) is set on electrograms acquired in an atrium of the heart, and, using the electrograms having the set WOI, an electrophysiological (EP) map is generated, of the atrium indicative of atrial tachycardia (AT) tissue locations therein.

The application discloses an AC coupling wideband signal acquisition method based on an FPGA time-to-digital converter, and mainly has the following technical points: an FPGA chip generates two same-frequency clock signals clk0 and clk180 with a phase difference of 180 degrees and an integer R frequency division clock signal clkDivR through clock management primitives or IP cores; the clk0 is output through a special clock pin, is filtered through an external series resistor, a capacitor and an internal capacitor, and then is input into a differential input buffer in the FPGA together with a reference signal REF formed by the resistor voltage division circuit after adding a DC bias; a wideband input signal to be sampled is input into the differential input buffer in the FPGA together with the reference signal REF after being filtered through a capacitor; a comparison output signal STA is divided into two branches after time delay adjustment, is propagated through a delay chain, and is driven by the clk0, the clk180 and the clkDivR to complete data latching, decoding and serial-parallel conversion; and the method supports wideband bipolar signal sampling, simplifies time-to-digital conversion logic, and reduces the clock frequency of the back-end signal processing.

The present invention is entitled "Multi-dimensional Acquisition of Bipolar Signals from a Catheter." A medical device is disclosed that includes a probe having a basket assembly at its distal end, the basket assembly including a plurality of elastic spines having a plurality of electrodes arranged along the length of each of the spines. Processing circuitry is configured to acquire a first bipolar electrical signal from tissue between a first electrode and a second electrode, the first and second electrodes being located at first and second locations along a first spine of the basket assembly, and a second bipolar electrical signal from tissue between the first electrode and a third electrode located in a third location on a second spine of the basket assembly, and to interpolate vector electrical properties of the tissue along an axis passing through the first location and between the second location and the third location based on the first and second bipolar electrical signals.

The invention provides a signal frequency multiplication method, a signal frequency multiplication device, radio frequency power supply equipment and a storage medium, and relates to the technical field of radio frequency, and the signal frequency multiplication method comprises the following steps: obtaining a reference signal; wherein the reference signal is a periodic bipolar signal. Performing phase shift on the reference signal according to the phase shift angles in the group of phase shift angles to obtain a group of phase shift signals; wherein the sum of phase shift angles of the group of phase shift signals is equal to 360 degrees. And synthesizing at least one group of phase shift signals to obtain a frequency multiplication signal. Wherein the frequency multiplication signal is also a periodic bipolar signal, and the frequency of the frequency multiplication signal is higher than that of the reference signal. According to the invention, the signal frequency can be improved at low cost.

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.