7 results about "Digital signal detection" patented technology

[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.

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.

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.

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.