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

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 provides a non-cooperative interference cancellation device and method for partial frequency band protection. The device comprises a microwave delay line, a synthesizer, a coupler, N auxiliary antennas, N + 1 down converters, N + 1 analog-to-digital converters, a digital signal processing unit, a digital-to-analog converter and an up converter, N is greater than or equal to 1, interference cancellation processing is carried out in an analog domain, and adaptive beam forming is carried out in a digital domain, and anti-interference processing of partial frequency points in a wide working frequency band is realized. The method provided by the invention can be used for interference protection of part of narrowband frequency points in a wide working band without influencing other signal frequency points which are not interfered, can avoid the problem of high-speed sampling of broadband signals, reduces the requirement on the sampling rate of a digital-to-analog converter, and greatly improves the receiving signal-to-noise ratio index; and beam forming signal processing can be realized in a digital domain under the conditions of a complex multi-path environment and a large number of antennas, so that the anti-interference performance is improved.

The invention discloses an automatic gain control (AGC) device for a global system for mobile communication (GSM) digital optical fiber frequency-selecting repeater and a quick adaptive time slot method for the AGC device. The AGC device comprises a core logic processing device, a coprocessor, an analog / digital converter (ADC), a radio frequency (RF) numerical control attenuator, an RF frequency mixer and a low noise amplifier. The quick adaptive time slot method for the AGC device comprises an adaptive time slot recovering process and a quick automatic gain control process. The invention has the advantages that a time slot recovering threshold value is calculated adaptively, the steps of installing and debugging by engineering staff are reduced, a signal level input into the ADC can be adjusted to a target level value by the adjusting process, an overall adjusting period is short, signal quality is not influenced substantially, the gain balance of an uplink and a downlink which have small signal time slots can be ensured, and the connection quality of users is ensured.

The invention relates to a video monitoring system and an implementation method thereof. The video monitoring system comprises a data acquisition module, a data processing module and a monitoring module; the data processing module comprises a data storage unit, a digital-to-analogue conversion unit and a data encryption unit; the monitoring module comprises an analogue-to-digital conversion unit and a data decryption unit; the data acquisition module is used for acquiring a digital video signal, and sending the acquired digital video signal to the data processing module; the data processing module is used for analyzing the digital video signal or transmitting the video signal to the monitoring module or sending an alarm instruction to the monitoring module; and the monitoring module is used for receiving the video signal or the alarm instruction or monitoring the digital video signal in real time. By means of the video monitoring system and the implementation method thereof disclosed by the invention, the acquired video image is analyzed and processed; workers can check a video image having a problem; furthermore, the transmitted video signal is encrypted; and the security of the video signal is ensured.

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 belongs to the field of optoelectronic technology, in particular to an optical transceiver module with high coupling efficiency. The optical transceiver module includes an upper box board, a lower box board, and a DIN-type interface laser; a part of the DIN-type interface laser is installed on the upper box board In the cavity formed with the lower box plate, the other part extends out of the cavity; the DIN-type interface laser includes a DIN-type interface, a first sleeve, a second sleeve, a third sleeve, a ceramic core and a laser; the third The sleeve, the second sleeve and the first sleeve are sleeved in sequence; the ceramic core is sleeved inside the first sleeve, the second sleeve and the third sleeve, and the laser is located behind the ceramic core. The invention adopts multi-stage sleeves, and uses epoxy glue to reinforce the sleeves, so that the stress of high temperature deformation is released to the non-rigid connection between the laser and the circuit board through transmission, so as to avoid the external temperature affecting the optical transmission and reception. The influence of the output optical power of the module ensures that the output optical power remains stable within a certain temperature range.

The invention provides a non-cooperative interference cancellation device and method for partial frequency band protection. The device includes a microwave delay line, a synthesizer, a coupler, N auxiliary antennas, N+1 down-converters, N+1 analog-to-digital converters, a digital signal processing unit, a digital-to-analog converter, and an up-converter, Where N is greater than or equal to 1, by performing interference cancellation processing in the analog domain and adaptive beamforming in the digital domain, the anti-interference processing of some frequency points in the wide operating frequency band is realized. The method provided by the invention can be used for the interference protection of some narrowband frequency points in the wide working frequency band without affecting other undisturbed signal frequency points, which can avoid the problem of high-speed sampling of broadband signals and reduce the sampling rate of digital-to-analog converters. Requirements, the receiving signal-to-noise ratio index is greatly improved; and the beamforming signal processing under the complex multipath environment and a large number of antennas can be realized in the digital domain, and the anti-interference performance is improved.

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 discloses a surge protection circuit of a video input signal, comprising a capacitor C1, a discharge tube T1 and three resistors R1, R2 and R3, wherein the resistor R1, the resistor R3 and the coupling capacitor C1 are connected to a video input circuit in series; one end of the discharge tube T1 is connected with a video input line at the front end of the resistor R1, and the other end of the discharge tube T1 is grounded; and one end of the resistor R2 is connected with the back end of the resistor R1 and the other end of the resistor R2 is grounded. The surge protection circuit can protect video AD devices at the same time of not influencing signal quality and avoids the devices from being burnt due to surge impact. The surge protection circuit is provided with one discharge tube and four capacitance resistance elements, and the structure is simple.

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.

The invention belongs to the technical field of optical communication, and discloses an emitted light power monitoring device and a preparation method thereof, and the device comprises a laser, a detector body, a detector insulation carrier, and a PCB. The PCB is provided with a differential signal line and a bonding pad. The laser is connected with the laser driver through the differential signalline; the detector insulation carrier is arranged between the laser and the laser driver and is in contact with the PCB; the first partial area of the back surface of the detector body is attached tothe second surface of the detector insulation carrier, the photosensitive surface of the detector body faces the backlight end of the laser, and the detector body and the PCB are spaced by a first distance; a gold plating area is arranged on the second surface of the detector insulation carrier; the detector body is connected with the gold plating area, and the gold plating area is connected withthe bonding pad of the PCB. The problem that a transmitting optical power monitoring scheme in the prior art cannot be suitable for an optical module product adopting a COB packaging process is solved, and reliable optical power monitoring can be realized.