22 results about "Digital signal detection" patented technology

A system and method are described for emitter identification and tracking in an electronic warfare (EW) environment. The system includes an antenna array configured to receive signals from radio frequency (RF) emitters during a dwell. Processing circuitry converts the received signals into digital signals. Pulses are detected and characteristics of the pulses determined to form pulse descriptor words (PDWs). The PDWs obtained during the dwell are deinterleaved using unsupervised machine learning to form clusters. The clusters are categorized using one or more supervised machine learning algorithms to determine whether the PDWs correspond to known or unknown emitters and the results tracked as in or out of library emitters. After merging the in or out of library emitters, an emitter report is generated and used to update a library of emitter profiles used by the supervised machine learning algorithms as well as determine countermeasures to generate.

An optical reception device includes: a reception circuit that performs digital coherent reception of an optical signal to which a probabilistic constellation shaping (PCS) is applied; a conversion circuit that samples an electric field signal in an analog format that represents an optical electric field component of the optical signal and converts the electric field signal into a digital signal in a digital format; a detection circuit that detects a sampling phase of the digital signal and generates sampling phase information that corresponds to the sampling phase; a compensation circuit that compensates for the sampling phase of the digital signal based on the sampling phase information; and an adjustment circuit that adjusts signal intensity of the digital signal before the sampling phase information is generated.

A gas sensing system includes a packaged photonic sensor including a resonant sensor and a control system. The control system includes a light module, a receiver module, and a core module. The light module includes a light source to generate light and transmit it to the photonic sensor. The receiver module receives light signals from the photonic sensor and converts them to digital signals. The core module includes a computing device and is programed to: control the light module to cause the light module to generate and transmit light to the packaged photonic sensor, receive the digital signals from the receiver module, and detect one or both of a concentration of a gas that interacted with the resonant sensor and an identification of the gas whose molecules interacted with the resonant sensor based at least in part on the received digital signals from the receiver module.

The invention provides a signal processing method and a disconnection detection device and system, and the method comprises the following steps: collecting an analog signal outputted by an external device, and converting the analog signal into a corresponding digital signal; detecting a connection state between the disconnection detection device and the external equipment based on the digital signal; in response to the connection state being connection, outputting a digital signal obtained after filtering in a current preset period; outputting a digital signal obtained after filtering in a previous preset period in response to the fact that the connection state is disconnected; wherein the preset period comprises digital signals corresponding to analog quantity signals acquired at least twice; therefore, the situation of production interruption caused by sudden disconnection between the disconnection detection device and the external equipment is avoided, and data transmission is more stable.

The invention relates to the technical field of integrated circuit power management, in particular to a double-loop digital LDO circuit which comprises a comparator array, a digital logic controller, a power tube set and a multi-stage current mirror circuit. Wherein the comparator array quantizes an error between a reference voltage and an output voltage into a digital signal, and detects a fluctuation condition of the output voltage relative to the reference voltage; whether the double-loop digital LDO circuit is in a transient adjustment mode or not is judged according to the fluctuation condition, and if the double-loop digital LDO circuit is in the transient adjustment mode, a coarse adjustment loop and a fine adjustment loop in a digital logic controller are sequentially triggered to control the output voltage to be stable; the power tube group comprises two groups of PMOS (P-channel Metal Oxide Semiconductor) switches which are respectively arranged in the coarse adjustment loop and the fine adjustment loop; the multi-stage current mirror circuit copies the changing load current and activates the power tube in the coarse tuning loop according to the fluctuation condition of the output voltage relative to the reference voltage, and the double-loop digital LDO circuit can more quickly and more accurately stabilize the output voltage under the condition that the load changes violently.

To provide an optical receiving apparatus and an optical receiving method that suppress a reduction in phase detection sensitivity of a sampling phase when PCS (Probabilistic Constellation Shaping) is applied to a multilevel modulation scheme.SOLUTION: An optical receiving apparatus includes: a receiving unit that performs digital coherent reception on an optical signal to which PCS is applied; a conversion unit that samples an electric field signal in an analog format representing an optical electric field component of the optical signal and converts the same into a digital signal in a digital format; a detection unit that detects a sampling phase of the digital signal and generates sampling phase information corresponding to the sampling phase; a compensation unit that compensates the sampling phase of the digital signal based on the sampling phase information; and an adjustment unit that adjusts a signal strength of the digital signal before generating the sampling phase information.SELECTED DRAWING: Figure 4

The invention provides an automatic impedance matcher and a control method, and relates to the technical field of impedance matchers. A voltage signal and a current signal output by the radio frequency power supply are respectively obtained through the voltage sampling circuit and the current sampling circuit, and are transmitted to the signal conditioning module. The signal conditioning module outputs an active power digital signal, a reactive power digital signal, a current square digital signal and a voltage square digital signal according to the signals. And the control module calculates complex impedance representing the load by using the digital signals, and performs impedance matching adjustment according to the complex impedance. The control module can also detect whether a radio frequency power signal exists or not according to the voltage square digital signal as one of judgment conditions for whether to start automatic impedance matching or not. Complete complex impedance information can be obtained, automatic impedance matching is achieved, and therefore good balance is achieved between speed and reliability.

[Problem] To improve the sensitivity of pixels for acquiring an image plane phase difference. [Solution] A light detection device provided with a pixel array, a conversion unit, and a phase difference detection unit. The pixel array is provided with a plurality of pixel groups arranged in a two-dimensional array pattern. The conversion section is provided in at least each of the pixel groups, and converts an analog signal based on an intensity of light acquired in the pixel groups into a digital signal. The phase difference detection unit detects a phase difference on the basis of the digital signal generated by the conversion unit. Each of the pixel groups includes a plurality of light-receiving pixels including at least a first light-receiving pixel and a second light-receiving pixel, and has an on-chip lens disposed on an incident surface side of the plurality of light-receiving pixels. The phase difference detection unit detects a phase difference on the basis of a first digital signal corresponding to an analog signal output from the first light-receiving pixel and a second digital signal corresponding to an analog signal output from the second light-receiving pixel.

Disclosed is a detection circuit and a method for detecting an internal resistance of a battery unit. By controlling an operating frequency of a first switch, a disturbance current of a certain frequency is generated, causing a voltage disturbance. A first analog-to-digital converter converts the voltage disturbance into a first digital signal. The internal resistance of a corresponding sub-battery is detected based on the first digital signal, and a discharge current or a second digital signal converted from a current sampling signal of the discharge current. By sending a difference between a battery voltage and a reference voltage to the first analog-to-digital converter for conversion, compared with directly sending a battery voltage, the voltage range to be quantified by the first analog-to-digital converter is smaller, improving resolution, reducing quantization error, enhancing detection accuracy, eliminating a need for using a DC-blocking filter capacitor, saving space, facilitating integration and miniaturization.

The utility model belongs to the technical field of robots, and discloses a multi-dimensional force sensor and a force control robot. The sensor comprises a shell and a module group, a containing cavity is formed in the shell, the module group is arranged in the containing cavity, the module group comprises an elastic element, a detection bridge and a circuit board, the circuit board is used for converting electric signals of the detection bridge into digital signals, and the detection bridge and the circuit board are both connected with the elastic element. And the module group can be integrally disassembled and assembled and integrally interchanged. According to the utility model, a modular structure can be formed, so that the structural complexity of the multi-dimensional force sensor is reduced, the interchangeability is ensured, the overall maintainability is improved, and the cost is reduced.

The present application discloses a signal detection device and a detection method, which are applied to the field of digital circuits. The signal detection device comprises a detection device; an input end of the detection device is connected to an output end of a voltage division circuit, input ends of the voltage division circuit are used for receiving a plurality of digital signals to be detected, and one of the plurality of digital signals corresponds to one of the plurality of input ends; and the detection device is used to determine the output voltage of the voltage division circuit (i.e., the voltage at the output end of the voltage division circuit) as a first voltage value, and determine a level state of each of the plurality of digital signals on the basis of the first voltage value, wherein the output voltage of the voltage division circuit is associated with the voltages at the plurality of input ends of the voltage division circuit. The detection device is connected to the voltage division circuit by means of one interface, thereby realizing the monitoring of the plurality of digital signals, using analog signals for processing reduces the dependence on GPIO pins in large-scale digital signal detection, and the hardware cost is low.

The present application relates to the field of digital signal detection and processing technology, and in particular to a method, device and equipment for deep power grid frequency enhancement for audio forensics, wherein the method comprises: obtaining audio data required for forensic applications; preprocessing the audio data and estimating the power grid frequency signal of the preprocessed audio data; inputting the power grid frequency signal into a generative adversarial network, and the generative adversarial network outputting an enhanced power grid frequency signal, wherein the generative adversarial network comprises a generator and a discriminator, the generator and the discriminator have different numbers of input channels, the encoder part of the generator uses multiple one-dimensional convolutional layers with the same structure, and the encoder part and the decoder part of the generator are mirror images of each other; target forensics are performed based on the enhanced power grid frequency signal and a reference signal database. Thus, the problems of signal extraction difficulty, insufficient quality, high computational complexity, limited application scope, and insufficient standardization and interoperability in the prior art are solved.

The present invention relates to the technical field of scanning devices, and in particular to a fast-response X-ray scanning device based on a micro-electromechanical chip, comprising: a detection table with a built-in photoelectric sensor, a plurality of positioning blocks provided thereon, and a table top for carrying an object to be imaged; an X-ray source, arranged above the detection table and capable of emitting X-rays in the direction of the detection table, the X-ray source being connected to a movable bracket capable of driving the X-ray source to move; a detector connected to the detection table and capable of receiving X-rays after passing through the object to be imaged and converting them into digital signals; the detection table fixing the position of the object to be imaged by the positioning blocks, the image acquisition module acquiring the image of the detection table, and the control module adjusting the position of the X-ray source according to the position of the object to be imaged on the image, so as to completely scan the object to be imaged. The present invention improves the accuracy and reliability of the entire scanning process, and improves the scanning efficiency and imaging quality by accurately locating the position of the object to be imaged and standardizing the image of the object to be imaged.

A method comprising: generating a frequency-modulated local oscillator signal (sLO(t)) with a frame partitioned into N chirp positions, where N is a predetermined integer; wherein the frame contains a scan chirp at one or more chirp positions and regular chirps at the remaining chirp positions, the regular chirps having a chirp bandwidth and a start frequency (fSTART), and the at least one scan chirp having a scan bandwidth greater than the chirp bandwidth; transmitting an RF signal representing the frame, wherein the transmit power is zero or reduced to less than the power of a regular chirp during the transmission of the at least one scan chirp;Receiving an RF radar signal (yHF(t)) corresponding to the frame, down-converting the received RF radar signal (yHF(t)) to a baseband using the local oscillator signal (sLO(t)), and generating a digital signal (y[n]) based on the down-converted signal (y(t)); detecting first samples affected by interference in a portion of the digital signal (y[n]) corresponding to the scan chirp, and updating the start frequency (fSTART) for the regular chirps following the scan chirp based on the detected first samples; and detecting one or more radar targets based on the digital signal (y[n]), replacing the portion of the digital signal (y[n]) that does not correspond to the regular chirps with preset samples.

The application provides an automatic impedance matcher and a control method, and relates to the technical field of impedance matchers. Voltage signals and current signals output by a radio frequency power supply are obtained by a voltage sampling circuit and a current sampling circuit respectively, and are transmitted to a signal conditioning module. The signal conditioning module outputs active power digital signals, reactive power digital signals, current square digital signals and voltage square digital signals according to the signals. A control module calculates complex impedance representing a load by using the digital signals, and adjusts impedance matching according to the complex impedance. The control module can also detect whether the radio frequency power signal exists according to the voltage square digital signals, and the detection result is used as one of the judgment conditions for starting automatic impedance matching. The application can obtain relatively complete complex impedance information, and realize automatic impedance matching, so that a good balance between speed and reliability is achieved.

The embodiment of the application relates to the field of circuit safety detection control, and discloses a ground conduction detection and protection circuit based on a safety switch, which comprises a safety switch module, a verification detection switch K0, a sampling module, a threshold value logic conversion module and a detection module. The safety switch module comprises a first safety switch S0, a second safety switch S1 and an optocoupler U1, the S0 is connected in series with a first end of a power supply, the S1 is connected in series with a second end of the power supply, the S0 and the S1 are connected to the U1, and the U1 is connected to the detection module. The K0 is connected in series to a circuit and outputs a periodic pulse signal. The sampling module comprises a first sampling resistor RS1 and a second sampling resistor RS2, and the RS1 and the RS2 are connected in series. The threshold value logic conversion module is connected to the detection module and is used for converting a voltage between the sampling resistors into a digital signal after comparison with a threshold value. The detection module is used for detecting ground conduction conditions of the S0 and the S1, and improves safety detection and protection mode reliability.

The invention relates to the technical field of wireless communication, and discloses a demodulation method and a demodulation device for an NFC (Near Field Communication) signal, and a readable storage medium. The demodulation method comprises the following steps: converting an NFC signal into a digital signal; detecting pulses in the digital signal, determining whether a frame header is detected according to the adjacent first pulse and second pulse, and determining a corresponding transmission rate; under the condition that a frame header is detected, cyclic counting is carried out with a cyclic counting starting point according to a cyclic counting strategy corresponding to the transmission rate, and data are demodulated and a frame tail is detected according to a cyclic counting value; and in the data demodulation process, under the condition that the pulse exists in the cycle count value within the first set range or the pulse does not exist in all the cycle count values, it is determined that an error exists in data demodulation, and data demodulation is stopped.

The present disclosure provides a signal processing method, a line break detection device, and a system. The signal processing method includes the following steps: collecting an analog signal output by an external device and converting the analog signal into a corresponding digital signal; detecting the connection status between the line break detection device and the external device based on the digital signal; in response to the connection status being connected, outputting a digital signal obtained after filtering during a current preset period; in response to the connection status being disconnected, outputting a digital signal obtained after filtering during a previous preset period; wherein the preset period includes digital signals corresponding to at least two collected analog signals; thereby avoiding production interruptions caused by sudden line break between the line break detection device and the external device, and making data transmission more stable.

A system and method are described for emitter identification and tracking in an electronic warfare (EW) environment. The system includes an antenna array configured to receive signals from radio frequency (RF) emitters during a dwell. Processing circuitry converts the received signals into digital signals. Pulses are detected and characteristics of the pulses determined to form pulse descriptor words (PDWs). The PDWs obtained during the dwell are deinterleaved using unsupervised machine learning to form clusters. The clusters are categorized using one or more supervised machine learning algorithms to determine whether the PDWs correspond to known or unknown emitters and the results tracked as in or out of library emitters. After merging the in or out of library emitters, an emitter report is generated and used to update a library of emitter profiles used by the supervised machine learning algorithms as well as determine countermeasures to generate.

In one embodiment, a receiver includes: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) analog signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize an analog signal based on the RF analog signal into a digital signal; a packet detector coupled to the ADC to detect the packet based on the digital signal; and a computation circuit coupled to the packet detector. The computation circuit may be configured to determine a received signal strength indicator (RSSI) value based at least in part on a portion of a preamble of the packet.

Example channel circuits, data storage devices, and methods for asynchronous sampling from an oversampled analog-to-digital converter are described. The channel circuit may include an analog-to-digital converter configured to generate an oversampled digital signal from an analog data signal using a sample rate that is an integer multiple of the baud rate of the channel circuit. A digital sample interpolator may then interpolate interpolated digital signal values from multiple signal values of the oversampled digital signal and select values at baud rate to generate a baud rate digital signal. The baud rate digital signal may be used by an iterative detector in a timing loop and, once a target timing is achieved, for the iterative detector to detect data bits from the interpolated digital signal.