36results about How to "Accurate signal reception" patented technology

The invention discloses an underground magnetic signal receiving device and receiving method based on the Hall effect. The device consists of a Hall element, an excitation current control circuit, a front-end signal processing module, a decoding and a main control module. When the system starts to run, the excitation current of the Hall element is first adjusted by the excitation current control circuit, then the main control module measures the communication frequency through TIM1 and then sets the clock of the FPGA decoding module, and then the Hall element converts the magnetic signal into The electrical signal is input to the front-end signal processing module, and the digital signal obtained after signal amplification, filtering, and analog-to-digital conversion is input to the FPGA decoding module, and finally the decoded data is input to the MCU. The invention utilizes the Hall element to receive the magnetic signal, and adjusts the excitation current according to the magnetic field distribution at different positions to obtain better voltage output. At the same time, under the response speed of the Hall element, the reception of signals in the frequency range of 2kHz~100kHz can be realized.

The invention discloses a self-offset well shock detection device, and relates to a well shock detection device. A motor is arranged in a shell; the output shaft of the motor is provided with a lead screw connected with a sliding nut; the sliding nut is hinged with a support rod; one end of the lead screw connected with the output shaft of the motor is provided with a flat-hole connector, and theoutput shaft of the motor is a flat shaft correspondingly; the flat-hole connector on the lead screw is in sliding connection with the output shaft of the motor; a compression spring is arranged between the flat-hole connector on the lead screw and the sliding nut; and after the support rod is unfolded, if conditions that soil on the well wall is loose and collapsed, a position is moved and a support point slides occur, the elasticity of the compression spring can push the sliding nut to drive the support rod to reliably support the well wall, so that the automatic support and offset can be achieved. The shock detection device is reliable to couple the well wall, low in noise, and high in precision, accurately receives signals, acquires signals truly and reliably, accurately performs analysis and judgment, and is suitable for well shock detection.

A circuit applied to a display apparatus includes a front-end circuit, a conversion circuit and an impulsive interference detection circuit. The front-end circuit converts an analog input signal into a digital input signal. The conversion circuit, coupled to the front-end circuit, converts the digital input signal from a time domain to a frequency domain to generate a frequency-domain signal. The impulsive interference detection circuit, coupled to the conversion circuit, detects a noise intensity of the frequency-domain signal to generate a detection result, which is used to determine whether the analog input signal has impulsive interference.