32results about How to "Signal processing is convenient" patented technology

The invention involves the field of signal collection technology, and a speed signal collection method, device and storage medium based on frequency division digital filtering are disclosed.Methods include: System clock synchronous processing to the collection of speed signals; frequency -frequency digital filtering for the speed signal of the system clock synchronous processing to obtain segmented speed signals;The collection results are performed on average filtering; determine the collection error based on the actual frequency of the sliding average filtering result and the actual frequency of the speed signal to be collected; according to the collection error, the frequency interval division and filtering frequency of frequency differential digital filtering are adjusted until the collection error meets the preset conditions; According to the final determined frequency interval and the corresponding sliding average filter results, the output speed collection results are integrated.The present invention can effectively filter the noise in different frequency bands in the speed signal to be collected, and combine the sliding average filtering algorithm, which greatly improves the collection accuracy.

The invention which relates to an optical instrument and detection imaging technique discloses a large field depth iris image acquisition system and a method based on a plurality of fixed-focus cameras. The system comprises an iris image collecting device and an image recognition device. The method comprises the following steps: respectively imaging the iris by means of the fixed-focus cameras having different imaging object distance ranges and producing a multi-path fixed-focus image results; choosing one or a plurality of multi-path fixed-focus image results through distance measurement or image quality evaluation method; carrying out image processing and identification of chosen qualified iris image data. The invention effectively integrates the imaging ranges of different fixed-focus cameras in the mode of self-adapting switchover, thereby taking advantages of the cameras and at same time removing disadvantages of the cameras, enlarging the integral imaging range of the acquisition system, and improving the feasibility of an iris recognition system. Compared with the prior iris imaging method adopting a zoom camera, the invention has the advantages of low cost, quick and noiseless focusing.

The invention provides a communication method between an intelligent device and a peripheral device based on the Profinet protocol, comprising: S1, configuring the system software and hardware requirements supporting the Profinet protocol in the intelligent device, and designing a table for the configuration; S2, drawing the electrical Schematic diagram and complete the wiring connection; S3, write the PLC / PMC interface program for the communication between the intelligent device and the peripheral device, and download it; S4, write the HMI interface program related to the PLC / PMC data, and download it; S5, through the Profinet software , import the GSD file of the peripheral device; S6, configure the data information of the peripheral device through the IODD file and table information of the substation module, and download the configuration file; S7, if the data displayed by the HMI is consistent with the internal data of the peripheral device, the intelligence can be performed normally Communication between equipment system and peripheral devices. The communication method of the present invention can directly read the internal variable data of peripheral devices through the Profinet protocol, and can quickly convert analog quantities into digital quantities, thereby improving the overall efficiency of equipment communication.

The invention discloses a signal conditioning circuit for an acceleration sensor with a high g value. The signal conditioning circuit is composed of an isolation amplification circuit, an alternating-current coupled circuit, a first voltage following circuit, a voltage bias circuit, a low-pass filter circuit and a second voltage following circuit sequentially connected in series; the isolation amplification circuit is used for performing signal isolation amplification and power supply isolation of a sensing signal Signal_in output by the acceleration sensor with the high g value and then outputting an isolation amplified signal Signal_out1; and the low-pass filter circuit is a unit gain two-order voltage-controlled voltage source low-pass filter circuit constructed by utilizing an integrated operational amplifier. According to the invention, the signal waveform can be improved; frequency confusion while discretizing is prevented; adverse effects of noise are overcome in the event that the signal and a noise spectrum are not overlapped; the signal to noise ratio is increased; furthermore, aiming at different attack targets, sensor signals can be effectively modified; preceding-stage analogue signals easy to identify and process are provided for a burst control algorithm precisely damaged by a hard target penetration warhead; and the signal conditioning circuit can stably work in a 100000g impact environment.

The invention discloses an optical real-time Fourier transform device and method with complex value output. The device includes a mode-locked laser, a first section of dispersion fiber, a Mach-Zehnder modulator, a second section of dispersion fiber, a continuous wave laser, The 90-degree optical hybrid, the first balanced photodetector, and the second balanced photodetector; the mode-locked laser, the first section of dispersive fiber, the Mach-Zehnder modulator, and the second section of dispersive fiber are connected sequentially through optical fibers, and the signal is transmitted from One input port of the 90-degree optical hybrid is input; the continuous optical signal generated by the continuous wave laser is input from the other input port of the 90-degree optical hybrid. The four-way signals output by the 90-degree optical hybrid are divided into two groups and enter the second A balanced photodetector and a second balanced photodetector. The invention has a simple structure and is beneficial for integrated use in the future; the optical fiber is used as a transmission medium to avoid external electromagnetic interference to a certain extent.

The invention discloses a bionic hair sensor for being sensitive to flow velocity and accelerated velocity vectors and a detection method thereof; the bionic hair sensor includes a top polymer hair, a middle annular silicon micro-sensor structure, and a bottom signal wire prepared on a glass substrate. When acted by an external accelerated velocity or fluid, the top hair drives a round mass block and an annular mass block in the annular silicon micro-sensor structure to swing; with use of a negative stiffness effect principle of an electrostatic force, and through swinging of the round mass block and the annular mass block in the annular silicon micro-sensor structure, resonant frequencies of resonators arranged around the round mass block and the annular mass block are caused to be changed, and values of the flow velocity and the accelerated velocity are detected; with use of a coupling structure of the mass block and the annular mass block, the swinging direction of the top hair is subjected to vector decomposition, and the vector direction of the accelerated velocity or the fluid velocity is detected.

The invention provides a method for measuring the sound pressure of a direct wave signal in which the sound wave propagates in a medium with a limited area, comprising the following steps: 1) First, lay out a transmitting point and a receiving point in a limited area of ​​the medium, and fix the distance between the two points When the transmitting point produces a continuous pulse wave with a certain pulse width, the receiving point forms a stable sound field in the limited area of ​​the medium, and then starts to collect the sound pressure signal emitted by the transmitting point; 2) Then, re- Arrange the transmitting point and receiving point, and keep the relative distance between the transmitting point and the receiving point unchanged, repeat the operation of the previous step, and repeat the operation M times, and the receiving point collects the sound pressure of M signal waves; 3) Finally, the receiving point The collected M signals are synchronized, then superimposed, and the superimposed waveforms are averaged to obtain the required sound pressure of the direct wave signal. With this method, even if there is acoustic interference reflected by the same frequency in a limited area of ​​the medium, the direct wave can be extracted relatively easily.

The invention discloses a novel four-hole site coil integral force transducer based on the principle of piezomagnetic effect. The force transducer comprises a transducer piezomagnetic body, a horizontal hole site, a horizontal coil W1.2, a vertical hole site, a vertical coil W3.4, a differential rectification output circuit, an excitation transformer and a low-frequency excitation power supply. In the invention, a horizontal hole site measurement coil and a vertical hole site compensation coil in a measurement area are completely separated; based on the inherent characteristic of the magnetic body material that the longitudinal magnetic conductivity parallel to an external force F is very sensitive to stress while the transverse magnetic conductivity vertical to the external force F is not sensitive to the stress, the measurement circuit is designed as an inductive four-wall balanced bridge according to the electric principle; and the bridge output is in a current rectification and resistance voltage reduction mode so as to realize an integral optimization measurement circuit with three-wire excitation, differential compensation and DC (direct current) output.