51 results about "Standard test signal" patented technology

The invention relates to a system and a method thereof for checking the product quality. The system comprises a checking implement, a camera device and a checking module, wherein the checking implement is used for positioning a finished product to be checked, the camera device is arranged on the checking implement, the checking implement and the camera device correspond to each other without change, the checking module is used for processing digital signals; check data is generated in such away that standard check signals are irradiated or a product to be checked is input, and the camera device takes a picture and converts the picture signals into digital signals through the check module. The check method is as follows: quality condition is input by using an external interface, and digital picture data of a qualified product is used as a standard, the whole picture is divided into a plurality of pixel regions through the check module according to the specification demands, the picture data of the product to be checked in each pixel region is analyzed one by one in an absolute and relative comparison method so as to judge the location and the type of the defects so that the quality is judged to be good or bad. The system and the method thereof for checking the product quality can accurately judge the quality of the product to be checked, thereby lowering the error ratio of the check result.

The invention discloses a testing system and method for conducted susceptibility of cable bunch injection. The system comprises a control module, a signal generation module, a signal amplification module, a coupling module, an injection clamp, a monitoring clamp and a signal measurement module, wherein the control module is used for generating a control signal controlling the signal generation module and the signal measurement module to work; the signal generation module generates a standard testing signal according to testing standards under the control of the control module; the signal amplification module amplifies the standard testing signal generated by the signal generation module and then sends the standard testing signal into the coupling module for coupling; the coupling module isused for coupling the standard testing signal amplified by the signal amplification module to the injection clamp; the injection clamp is used for injecting the amplified standard testing signal intoa to-be-tested cable; the monitoring clamp is used for picking up a signal conducted by the to-be-tested cable and transmitting the signal to the signal measurement module; the signal measurement module is used for reading measurement data of the coupling module and monitoring clamp under the control of the control module. The testing system and method for the conducted susceptibility of the cable bunch injection have the advantage that on the basis of no additional purchase of other equipment, it can be ensured that testing is started from the testing frequency below 4kHz.

The invention discloses a control method for an intelligent socket. The method comprises the following steps of: A, after the socket is electrified, loading a load on a main control circuit to a normal work state in pre-set time; B, collecting a simulated current signal on the main control circuit at regular time; C, calculating an average value of the collected simulated current signal; D, taking the percentage of the average value, which is less than the average value of the simulated current signal, as a standard current signal, and storing the standard current signal; E, collecting a real-time current signal on the main control circuit and comparing the real-time current signal with the standard current signal; and F, if the real-time current signal is less than the standard current signal, switching off a power supply of a controlled circuit; otherwise, maintaining the power supply of the controlled circuit. The invention further discloses a control circuit which is matched with the control method and is used for the intelligent socket. The intelligent socket manufactured by the invention has the beneficial effects of convenience for use, free debugging of the circuit, high automation degree and energy saving.

The invention provides an error code detection device, which belongs to the technical field of communication detection. The error code detection device comprises a transmitting end and a receiving end, wherein the transmitting end is used for transmitting a test pseudorandom sequence code obtained through converting and processing a pseudorandom sequence code to a test device; and the receiving end is used for receiving a test sequence code outputted by the test device for error code detection, and the test sequence code is the sequence code outputted when the pseudorandom sequence code is transmitted through a to-be-detected device. The pseudorandom sequence code has good self correlation and good statistical properties. By using the pseudorandom sequence code as a standard test signal, the error code detection accuracy can be improved.

The invention discloses a time synchronization control system of an off-grid photovoltaic power system, which comprises a time receiving circuit, a clock correction computation control circuit and an off-grid system drive control circuit, wherein the time receiving circuit has a receiving antenna, receives a radio standard time signal transmitted by a radio time launcher and sends the received signal to the clock correction computation control circuit; the clock correction computation control circuit is used for filtering and analyzing the standard time signal, comparing the standard time signal with an actual clock signal of the photovoltaic power system, correcting the actual clock signal and sending the corrected clock signal to the off-grid system drive control circuit; and the off-grid system drive control circuit is connected with at least two off-grid photovoltaic power systems and drives all the off-grid photovoltaic power systems according to the received corrected clock signal, so that all the off-grid photovoltaic power systems are kept synchronous. When the embodiment of the invention is used, the precise control over the time synchronization of the off-grid photovoltaic power systems is realized, and the construction cost of a project can be reduced.

Airplane bus cable test equipment and a test method are disclosed. The equipment comprises a portable case, a detection host and a detection sub-machine are arranged in the case, and the detection host comprises a power supply module, a man-machine interaction interface, a comprehensive test module, a host communication module and a test port. The detection sub-machine comprises at least one bus test signal transmitter, the bus test signal transmitter comprises a power supply module, a signal generation module, a sub-machine communication module and a test signal transmitting port, and during testing, a test instruction is input through the human-computer interaction interface of the detection host, the signal generation module of the detection sub-machine generates a matched standard test signal, the comprehensive test module analyzes the test signal to obtain a test result, and then the test result is sent to the human-computer interaction interface to be displayed.

The invention discloses an ultra-low distortion navigation signal acquisition and non-aliasing separation method, which belongs to the technical field of signal processing. This method first uses the spectrum distribution clusters of signal and environmental interference to perform bandpass reconstruction, so that the monitored signal can be collected with high resolution and no aliasing, and then uses the standard test signal without distortion to complete the digital closed loop of the multi-channel signal transmission link Comparing and modeling the system transfer function of the transmission channel, and using the optimal fitting method to estimate the conditioning correction coefficient, so as to complete the ultra-low distortion correction of signal distortion, and finally use the prior signal component time-frequency domain characteristics to complete the mixed signal Ultra-low distortion quasi-blind source separation. This method can accurately map the link environment characteristics and signal multi-domain distortion effects, reduce the nonlinear deterioration of amplitude-frequency characteristics, the deterioration of orthogonality, the fluctuation of group delay and the aliasing of original data, and improve the accuracy of test data collected by navigation satellites. It can realize high-precision and high-reliability navigation signal monitoring and evaluation.