35 results about "Ratio Sequence" patented technology

A method and apparatus for generating a phase-locked output signal includes generating an intermediate signal phase locked to an input signal by frequency dividing the intermediate signal by a temporally-varying divide ratio sequence to generate a first feedback signal and phase comparing the first feedback signal with the input signal. An output signal is generated phase locked to the first feedback signal by frequency dividing the output signal by the temporally-varying divide ratio sequence to generate a second feedback signal and phase comparing the second feedback signal with the first feedback signal.

The invention discloses a method for identifying a fluctuation rub-impact fault of a turbo generator set in real time in the technical field of vibrational state monitoring and fault diagnosis of rotating machinery. The method comprises the following steps of: calculating and storing over-all vibration amplitude value data at intervals of one stepping length; after a first time length is reached,acquiring the maximum values of the stored over-all vibration amplitude value data; after a second time length is reached, arranging the maximum values of the over-all vibration amplitude value data to form an over-all vibration amplitude value extreme value sequence; solving the difference of the maximum value and the minimum value of the over-all vibration amplitude value extreme value sequence; calculating the ratio of every numerical value in the over-all vibration amplitude value extreme value sequence to the maximum value of the over-all vibration amplitude value extreme value sequence and forming a ratio sequence; calculating change peakness parameters of the ratio sequence, and the sum of the difference of the ratio sequence and the difference of the ratio sequence; and judging whether the axis of the set has the fluctuation rub-impact fault or not according to the obtained result. Real-time automatic on-line monitoring of vibration data of a bearing pedestal is realized, and efficiency and accuracy of fluctuation rub-impact fault real-time analysis of the turbo generator set are improved.

The invention discloses a multistage pulse amplitude modulator with a function of achieving amplitude equalization of a modulation signal. The multistage pulse amplitude modulator comprises n Mach-Zahnder intensity modulators in series connection, wherein input ports and output ports of the Mach-Zahnder intensity modulators are connected end to end, and the input port of a first Mach-Zahnder intensity modulator is utilized as a light source input port, the output port of a final Mach-Zahnder intensity modulator is utilized as a modulation signal output port, and OOK signals with the same amplitude are loaded to each Mach-Zahnder intensity modulator, thereby achieving the modulation of 2N-stage pulse amplitude modulation signals; the effective modulation arm length ratio among the n Mach-Zahnder intensity modulators is 20 : 21: 22 : ... : 2N-1, and the arrangement sequence of the Mach-Zahnder intensity modulators with the above effective modulation arm length ratio does not limit to the above ratio sequence. According to the multistage pulse amplitude modulator with the function of achieving the amplitude equalization of the modulation signal, by improving the structure of the modulator, the flexible control of a phase bias point and the equalization of optical signals on the two arms of the modulator when the modulation signal is modulated are achieved, and the extinction ratio of the modulator is increased.

The invention discloses a sample attribute analysis method, device and equipment, and belongs to the field of data analysis. The method comprises the following steps: determining the ratio Ri of samples of each attribute value according to the amount of the samples of each attribute value of the sample attributes of all samples and the overall sample amount; ordering all the attribute values of the sample attributes from larger to smaller so as to obtain the ratio sequence of the sample attributes [R1, R2, R3...Rn]; accumulating the ratio Ri of samples of each attribute value with the former ratio of samples of each attribute value R1, R2...Ri-1, so as to obtain a accumulated ratio Wi of each attribute value; confirming an advantage value I of the sample attributes according to the accumulated ratio Wi and the amount n of the attribute values, and taking the advantage value I as the analysis result of the sample attributes. According to the invention, the problems that a current sample attribute analysis method has higher requirement on analysis personnel, is stronger in subjectivity, low in treatment efficiency, large in resource consumption, and has no unified evaluation reference are solved, the analysis efficiency is improved, the working requirement on analysis personnel is reduced, and a unified evaluation reference is provided.

The invention discloses a hyperspectral image virtual dimension estimation method based on ridge ratio shrinkage, which includes: extracting the sample matrix of the hyperspectral image to be processed; calculating the covariance matrix and the correlation matrix of the sample matrix, and calculating the characteristics of the two Values ​​and sorted; according to the eigenvalue sequence, construct a ratio sequence; compare the sequence value in the ratio sequence with the preset constraint value, and obtain the virtual dimension of the hyperspectral image to be processed. The estimation method of the present invention abandons the idea of ​​hypothesis testing and directly adopts the algorithm of constructing ratio sequence for estimation, which can improve the accuracy of hyperspectral image virtual dimension estimation.

The invention relates to a unit ratio sequence-type transmission mechanism capable of being independently controlled. The unit ratio sequence-type transmission mechanism comprises a first planetary gear set, a second planetary gear set, an energy input end and a free transmission end, wherein the first planetary gear set comprises an energy output end; the second planetary gear set is connected to the first planetary gear set and comprises a control end; the energy input end is arranged on the second planetary gear set; and the free transmission end is arranged on the first planetary gear set, controlled by the control end and used for freely switching the free transmission end to be used as one of the energy input end and an energy output end. The unit ratio sequence-type transmission mechanism disclosed by the invention has the beneficial effect of improving the energy transmission efficiency.

An embodiment of the present invention provides a decoding processing method and a decoder, the method comprising: receiving the log-likelihood ratio sequence sent by the decoding demodulator; performing pre-decoding on the log-likelihood ratio sequence to obtain At least two sequences of posterior probability log-likelihood ratios; decoding the at least two sequences of posterior probability log-likelihood ratios to obtain a decoding result, the decoding processing method and decoding method provided by the embodiments of the present invention device, which can improve the performance gain of decoding.

The invention discloses an improved soft output tail biting convolution code decoding method. The method comprises the following steps of (1) acquiring a logarithmic likelihood ratio sequence; (2) calculating a branch metric; (3) calculating a forward metric; (4) calculating a backward metric; (5) calculating an information-bit logarithmic likelihood ratio to form the logarithmic likelihood ratio sequence; and (6) deciding. In the invention, the branch metric is calculated for one time, the forward metric and the backward metric are calculated for twice, and through using splicing, combination calculating is performed on a logarithmic likelihood ratio, a complexity is low and decoding performance is increased. In the invention, the information-bit logarithmic likelihood ratio sequence is calculated and is served as soft output, a tail biting convolution code can be served as an internal code which can carry out iteration with an external code in a whole system and an application value is expanded.