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649results about How to "Avoid lowering" patented technology

Crop pest identification method and system based on Android platform

The invention relates to a crop pest identification method based on an Android platform. The method comprises the steps of starting application software of a mobile phone with the Android platform, enabling the mobile phone to be connected with a wireless network, selecting the type of a crop, collecting a pest image, transmitting the pest image to an application program server, cutting the pest image with the application program server, and judging whether the expected threshold value is reached or not; if yes, conducting preprocessing, feature extraction and multi-feature fusion on the pest image in sequence; if not, cutting the pest image again; identifying features of the pest image, and transmitting the identified result and the corresponding pest control method to the mobile phone with the Android platform. The invention further discloses a crop pest identification system based on the Android platform. According to the crop pest identification method and system based on the Android platform, a user can intelligently diagnose crop pests anytime and anywhere, the limitation of simply relying on an agricultural specialist is avoided, the Android mobile phone platform is utilized, a traditional crop pest diagnosis mode is completely changed, farmland management efficiency is improved, and convenience is brought to the user.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1

Digital intermediate frequency conversion method and system used in repeater

The invention discloses a frequency changing method of digital middle-frequency signals used in a repeater station system, which comprises two steps of an up frequency changing process and a down frequency changing process: in the down frequency changing process, the middle-frequency signals after digital analog conversion are processed by digital wave filtering processes such as an extraction process, a bandpass compensation, a signal shaping process, etc. after a digital frequency mixing process, the middle-frequency signals can be moved to a zero middle-frequency, a digital signal with the high speed rate can extracted as two-channel quadrature digital baseband I, Q signal with a low speed rate; in the up frequency changing process, the digital baseband I, Q signals acquired from the down frequency changing process are processed by an interpolation filtering process, then processed by I, Q modulation process and a secondary frequency mixing process, and the signals can be processed by a gain adjustment and control, finally high speed digital middle-frequency signals are outputted. Correspondingly, the invention also discloses a frequency changing system thereof. The invention can be achieved by using PLC units such as FPGA, CPLD, EPLD and DSP, etc., which can improve the integration degree of repeater station equipment; meanwhile, an ASIC chip is removed to decrease heating capacity and to improve the reliability.
Owner:COMBA TELECOM SYST CHINA LTD

Series resonance mode nuclear magnetic resonance detection device and detection method

The invention relates to a series resonance mode nuclear magnetic resonance detection device and detection method. According to the series resonance mode nuclear magnetic resonance detection device, a three-component magnetic field measuring circuit is connected with a computer; a high power supply with adjustable output voltage, an emission control unit and a signal collection unit are connected; the high power supply with the adjustable output voltage is connected with a high power emission bridge circuit; the emission control unit is connected with a high-voltage relay; one end of the high-voltage relay is connected with a first receiving unit, and the other end of the high-voltage relay is connected with a Nth receiving unit. By the adoption of the series resonance mode, the size and the weight of a receiving device are greatly reduced, the transverse resolution of nuclear magnetic resonance detection is improved, a small-size receiving probe has better adaptability, and by the adoption of the series resonance mode receiving units, consumed manpower, material resources and time when a large coil is paved on spot are avoided, and working efficiency is improved. A plurality of resonance receiving units which are connected in series in each series resonance mode receiving unit work at the same time, and the amplitude of a received nuclear magnetic resonance signal is improved.
Owner:JILIN UNIV

Audio power amplifier and audio device

The invention discloses an audio power amplifier and an audio device. The audio power amplifier comprises a digital-to-analog conversion circuit, an integral comparison circuit, a power output level circuit, and a feedback circuit, wherein the digital-to-analog conversion circuit converts a digital audio signal into a first analog signal; the integral comparison circuit obtains an analog audio signal according to the first analog signal, a feedback signal and a common-mode voltage signal; the power output level circuit supplies the power by employing a second power supply voltage, and carries out power amplification on the analog audio signal to output a power amplification signal; the feedback circuit generates the feedback signal according to the power amplification signal; the feedback circuit includes a voltage division circuit and a feedback branch, wherein the voltage division circuit carries out voltage division on the power amplification signal, and an obtained voltage division signal is output via a voltage division node; a first end of the feedback branch is coupled to the voltage division node, and the second end of the feedback branch outputs the feedback signal; and an amplitude of the common-mode voltage signal is associated with the second power supply voltage and a voltage division ratio of the voltage division circuit. According to the scheme disclosed by the invention, the audio signal output by the audio power amplifier has a large dynamic range, the circuit area is small, and the cost is low.
Owner:SHANGHAI AWINIC TECH CO LTD
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