31results about How to "Does not affect signal quality" patented technology

The invention relates to an NFC coil driving device, a method and electronic equipment. The NFC coil driving device includes an NFC coil and a display driving chip. The NFC coil is connected to a display driver chip, and the NFC coil is used for data transmission; the display driver chip is provided with an NFC driver module, and the display driver chip is used to receive NFC drive signals, and generate clock pulses according to the NFC drive signals The signal, through the NFC driver module, converts the clock pulse signal into a corresponding frequency and outputs it to the NFC coil, and drives the NFC coil for data transmission. By setting a simple NFC driver module in the display driver chip, it is possible to drive the NFC coil for data transmission through the display driver chip, as long as the clock signal can be converted into the corresponding frequency, it is easy to drive the NFC coil for data transmission , and the size of the display driver chip is small, and there is no additional NFC module, which reduces the space occupied by the NFC module.

The invention discloses a satellite communication system and a backward calibration method of the satellite communication system. According to the satellite communication system, a coupling network is added on the back face of a backward receiving antenna, correction signals are generated from a ground station in a spread spectrum mode, the correction signals are accessed to the coupling network after being received and processed forwards by a satellite, and then the correction signals are coupled to each backward data receiving channel and transmitted to the ground station along with backward user data; the ground station carries out dispreading processing on the spread spectrum correction signals to obtain time delay information, amplitude information and phase information of the channels, and therefore backward calibration is completed. According to the satellite communication system and the backward calibration method of the satellite communication system, multiple calibration stations are not needed, and therefore the complexity of system maintenance is reduced; the spread spectrum correction signals are generated on the ground instead of being directly generated on the satellite, and therefore the amount of equipment on the satellite is reduced; the signals in the spread spectrum mode are adopted, so on-line calibration of user transmission will not be interrupted.

The invention discloses novel low-cost network physical on-off control circuit topology. The topology comprises a network card chip, a network transformer, an RJ45 network interface and a push-pull circuit, wherein the network card chip and the network transformer are connected through a network signal bus, the network transformer and the RJ45 network interface are connected through a network signal bus, an output end of the push-pull circuit is connected with a center tap of the network transformer, and an input end of the push-pull circuit is connected with a network on-off control signal. The circuit topology realizes network physical on-off management on the basis of level control on the center tap of the network transformer, has the characteristics of low cost, small size and simplicity in implementation, is compatible with all network interfaces and is in common use.

The invention discloses an insulator pollution flashover leakage current signal sparse representation method based on wavelet analysis in the technical field of electric power system signal processing. The method comprises the steps that a sym8 orthogonal wavelet basis is adopted as a sparse basis psi, a wavelet sparse transformation orthogonal matrix is constructed, and the sparseness K of original leakage current signals is determined; a Gaussian random matrix fai is constructed and used as a measurement matrix, a measurement value M is calculated according to the sparseness K, and a measurement vector y and a sensing matrix theta are obtained through a sparse representation equation; the original leakage current signals are reconstructed through the measurement vector y and the sensing matrix theta under an OMP algorithm. According to the method, the requirement for sensor sampling frequency is lowered, the sampling and reconstruction speed of the signals is improved on the premise of not influencing signal quality, and meanwhile reconstruction accuracy is guaranteed.

The invention relates to a predictive parallel branch limiter and a limiter method, which are applied in an adaptive decision feedback equalizer, and the predictive parallel branch limiter includes: an adder of fixed coefficients of the nth power of M; n-th power limiters; a first multiplexer and n delay units connected in series; the method comprises the following steps: after receiving a signal to be processed and M default values ​​of the n-th power, adding them respectively After the operation, output signals to the nth power of M are obtained, and M is an integer greater than 1; the above-mentioned output signals are respectively received and subjected to limiting processing, and then output to the nth power of M respectively. level limiting signal; and outputting one of the above limiting signals according to n selection signals with different delay times.

The invention discloses a bidirectional buffer circuit for two-wire serial interfaces, and relates to the field of analog integrated circuit design. The bidirectional buffer circuit comprises a bus master, a bus slave and a bidirectional buffer, wherein the bus master comprises a master data bus SDAM which is connected with a power supply VDM through a pull-up resistor RM and grounded through a stray capacitor CM; the bus slave comprises a slave data bus SDAS which is connected with the power supply VDS through a pull-up resistor RS and grounded through a stray capacitor CS; the bidirectionalbuffer comprises a buffer BUF1, a BUF2 and a switch signal CNCT; both output of the buffer BUF2 and input of the buffer BUF1 are connected with the master data bus SDAM when being connected with eachother; both output of the buffer BUF1 and input of the buffer BU2 are connected with the slave data bus SDAS when being connected with each other; and the switch signal CNCT is used for controlling the opening and closing of the buffer BUF1 and the buffer BUF2. According to the bidirectional buffer circuit, when bus wiring distances are relatively long or slaves connected on buses are too many, the bus signal quality is not influenced.

The invention relates to a Bragg diffraction principle-based optical packet switching system and a Bragg diffraction principle-based optical packet switching method. The system comprises an optical packet generating module, an optical payload and optical label separation module, a label processing module and an optical switching module, wherein an optical packet generated by the optical packet generating module enters the optical payload and optical label separation module after passing through a fiber and then is separated into two paths of optical payload and one path of optical label, a routing control signal is output to the optical switching module after the optical label and one path of optical payload enter the label processing module, and the other path of optical payload directly enters the optical switching module and is output according to the routing control signal. The system and the method have the advantage of high transmission efficiency.