43results about How to "Strong signal to noise ratio" patented technology

The invention provides a weak light signal spectrum fast measuring device and method. On the basis of a light source spectrum power distribution test method of a light splitting type spectrum measurement system, a face array CCD (charge coupled device) is adopted for replacing an original line array CCD, tiny light signals can simultaneously complete multiple times of measurement, the intensity of output signals can be improved through the processing on measuring results, meanwhile, the random noise is eliminated, and the fast measurement of the tiny light signal spectrum power distribution is realized. The weak light signal spectrum fast measuring method has the advantages that the measurement speed is high, the precision is high, the operation is simple, the universality is high, and the technical support is provided for the spectrum test of other kinds of spectrum instruments.

The present invention relates to the technical field of power grid monitoring, and more specifically, to a method and system for analyzing the breakpoint position and disturbance position of a submarine optical cable, including: using a data acquisition card to collect signal strength data on the optical cable, and determining the intensity of the collected information The signal strength curve is obtained after the point data is averaged; the multiple signal strength curves are accumulated; the difference curve is obtained by subtracting the value of the intensity accumulation curve obtained by subtracting two adjacent accumulated strength curves; the value on the difference curve Compared with the threshold value, the point on the difference curve that exceeds the threshold value is judged as a submarine cable disturbance event. When events occur at all points after a certain point, it can be judged that the point is a breakpoint of the optical cable; Points whose coordinate values ​​are all less than 0 are disturbance points. The invention accumulates the signals in space and time to obtain a strong signal-to-noise ratio, and judges the disturbance on the submarine optical cable by subtracting the two sets of accumulated signals before and after to obtain the breakpoint position of the submarine optical cable. At the same time, the position of the breakpoint of the optical cable can be judged, and the judgment is accurate and the calculation time is small.

An impedance-analysis-based vocal cord detecting device comprises a sine-wave generator, an isolator, a current detecting module, a current-voltage switching module, a summing unit, a demodulating module, an analog to digital converting module and a digital signal processing and controller. The sine-wave generator provides sine excitation signals, the current detecting module detects current generated when the sine excitation signals are applied to a throat, the current-voltage switching module switches the current into voltage, the summing unit sums the voltage and sine signals with same frequency and reverse phase of the sine excitation signals, the demodulating module demodulates output of the summing unit and the sine signals, the analog to digital converting module coverts demodulates signals into digital signals, and the digital signal processing and controller processes the digital signals to generate electric glottis image signals. The invention further discloses a corresponding signal detecting method. Compared with the existing vocal cord detecting schemes, the impedance-analysis-based vocal cord detecting device can improve detecting accuracy.