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34results about How to "Save hardware space" patented technology

Millimeter wave short-range target detection method based on composite frequency modulation continuous waves

The invention discloses a millimeter wave short-range target detection method based on composite frequency modulation continuous waves. The method is high in efficiency and good in real-time performance. The method comprises the following steps: (10) millimeter-wave radar signal transmission: constructing frequency-modulated continuous waves of four target waveforms, and transmitting the frequency-modulated continuous waves as millimeter-wave radar transmission signals; (20) echo signal frequency mixing and filtering: carrying out frequency mixing, sampling and filtering on echo signals and the transmitted signals; (30) difference frequency signal spectrum peak value detection: performing fast Fourier transform and peak value detection on discrete signals, and obtaining echo difference frequency signal peak value frequency corresponding to each segment of target waveform through peak value search; and (40) composite waveform target detection: synthesizing the echo difference frequency signal peak frequency corresponding to each segment of target waveform to obtain a combined target distance velocity matrix, a velocity matrix and a distance matrix; removing false targets in the combined target distance velocity matrix; removing false targets in the combined target distance velocity matrix; and obtaining distance and speed information of a real target.
Owner:NANJING UNIV OF SCI & TECH

Frequency conversion smoke exhaust ventilator

The invention discloses a frequency conversion smoke exhaust ventilator. The frequency conversion smoke exhaust ventilator comprises a main control circuit board and a frequency conversion circuit board; the frequency conversion smoke exhaust ventilator also comprises a low-voltage power supply circuit for supplying power for the main control circuit board and the frequency conversion circuit board; the low-voltage power supply circuit comprises a bridge type rectifying circuit, a single chip microcomputer, a capacitive program-controlled voltage-reduction circuit and a switch circuit; the bridge type rectifying circuit comprises triodes Q1 and Q3 and diodes D2 and D3; the capacitive program-controlled voltage-reduction circuit comprises capacitors C2, C3 and C4 and triodes Q4 and Q5; the switch circuit comprises two groups of program-controlled synchronous switches; the first group switches are connected with the output end of the bridge type rectifying circuit; the second group switches are connected with the output ends of the capacitor C2 and the triode Q4; and the two groups of the program-controlled synchronous switches are closed in different time. The frequency conversion smoke exhaust ventilator adopts the bridge type switch structure, so that the purpose of outputting the safe and isolated power supply is realized.
Owner:山东金美尔机电科技有限公司

Capacitive switch safety isolation program-controlled power supply circuit

The invention discloses a capacitive switch safe isolation program-controlled power supply circuit. The capacitive switch safe isolation program-controlled power supply circuit comprises a bridge type rectifying circuit, a single chip microcomputer, a capacitive program-controlled voltage-reduction circuit and a switch circuit; the bridge type rectifying circuit is composed of triodes Q1 and Q3 and diodes D2 and D3; the base electrodes of the triodes are connected with the single chip microcomputer; the capacitive program-controlled voltage-reduction circuit comprises capacitors C2, C3 and C4 and triodes Q4 and Q5 to form direct current stage-by-stage voltage reduction; the base electrodes of the triodes Q4 and Q5 are connected with the single chip microcomputer; the switch circuit comprises two groups of program-controlled synchronous switches; the first group switches are connected with the output end of the bridge type rectifying circuit, and the input ends of the capacitor C2 and the triode Q4; the second group of switches are connected with the output ends of the capacitor C2 and the triode Q4, and the input ends of the capacitor C3 and the triode Q5; and the two groups of the program-controlled synchronous switches are closed in different time. The capacitive switch safe isolation program-controlled power supply circuit adopts the capacitive program-controlled voltage-reduction circuit instead of a cumbersome power supply transformer, so that the factor power of the mains supply is improved and a large amount of electric energy is saved.
Owner:泰州市海通资产管理有限公司

Alignment adjustment method of blocking component, controller and gate equipment

The invention discloses an alignment adjustment method for a blocking component. The method comprises steps of carrying out alignment adjustment of the blocking component at a drive controller side used for controlling a direct drive motor; according to a deviation value between a first absolute position angle of an output rotating shaft of the direct-drive motor when the blocking component is located at the set position and a second absolute position angle of the output rotating shaft of the direct-drive motor when the blocking component is located at any position, the direct-drive motor is controlled to rotate, and the blocking component is adjusted to the set position from the current any position; the first absolute position angle and the second absolute position angle are determined by capturing pulse width modulation (PWM) signals outputted by a coding disc installed on an output rotating shaft of the direct drive motor. The method is advantaged in that position detection devices such as a travel switch and a detection rod do not need to be additionally installed, hardware cost and the mechanism size space are saved, miniaturization and refinement of a machine core structure can be conveniently achieved through direct drive, and reliability is improved due to the fact that connecting cables of the in-place switch plate are reduced.
Owner:HANGZHOU HIKVISION DIGITAL TECH

Identity authentication method and system based on fingerprint sound waves

The invention relates to a fingerprint identification technology, and aims to provide an identity authentication method and system based on fingerprint sound waves. Comprising the steps that a user puts the finger pulp of a finger on a friction material, the finger pulp slides on the surface of the friction material for multiple times, and a microphone records friction sound in the finger moving process; carrying out noise reduction processing on the collected sound signal, and intercepting a sliding friction audio signal after noise reduction; performing feature extraction on the intercepted audio signal to obtain a third-level audio feature based on a fingerprint feature; fusing, classifying and predicting the extracted audio features by using a plurality of classifiers by using an integrated classification learning method; and voting the prediction result according to the weight to obtain a user identity authentication result, and storing the user identity authentication result with the authentication result. According to the invention, it can be ensured that fingerprint authentication can only be based on field living body identification, and the security is greatly enhanced while the privacy of the user is protected; the fingerprint information of the user can be obtained only through the microphone, the hardware cost and the space can be saved to the maximum extent, and the method has good industrial application prospects.
Owner:ZHEJIANG UNIV
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