University of Electronic Science and Technology of China

Wuhuang Huang

Jun Jiang

Hao Zeng

Lianping Guo

Kuojun Yang

Peng Ye

Qinchuan Zhang

Duyu Qiu

Feng Tan

Huiqing Pan

Jian Gao

Houjun Wang

Shulin Tian

Pan Wang

Xiaoman Jiao

Shuo Wang

The present invention provides a method for 3D waveform mapping of full-parallel structure, first, a 3D waveform mapping database is created according to the size of a 3D waveform image, the number of bits of probability value and the ADC's resolution of data acquisition module, then the 3D waveform mapping database is divided into M&#xd7;Mindependent mapping storage areas along the time axis and the amplitude axis, and each independent mapping storage area is assigned a RAM, then RAMs are selected and addresses are calculated based on the sampling values and the structure of created 3D waveform mapping database, finally, parallel mappings are performed simultaneously on the time axis and the amplitude axis according to the selected RAMs and calculated addresses. Thus, the mapping time are shorten, especially in vector mapping mode, several RAMs are used for mapping, so the WCR of DSO is improved.

Method for 3D waveform mapping of full-parallel structure

The present invention provides a method and system for oscilloscope triggering. The power spectrum entropy threshold Gand the singular spectrum entropy threshold Gare obtained by calculating the averages of the power spectrum entropy Hand the singular spectrum entropy Eof the first a waveform data frames respectively. Then, for the waveform data frame x(&#x3c4;) and thereafter, If the power spectrum entropy His greater than power spectrum entropy threshold Gand the singular spectrum entropy Eis greater than the singular spectrum entropy threshold G, the waveform data frame x(&#x3c4;) is an abnormal signal, the second trigger occurs, storing and displaying the waveform data frame. Thus the storage and display of abnormal signal is realized.

Method and system for oscilloscope triggering

A method for oscilloscope 3D mapping in scan mode. The input signal is acquired using a real-time sampling rate which is Dtimes higher, thus more sampling points, i.e. Dacquired data can be obtained during the time interval between two consecutive horizontal pixels. The Dacquired data are mapped into a same column of the screen to implement fluorescent waveform display. In addition, to realize the scanning display, a flag X is introduced into the three-dimensional database, when the screen refresh signal arrives, the first Dacquired data are read out from the unread acquired data in FIFO memory. The three-dimensional database is updated from the flag X, which make the leftmost waveform always be the oldest waveform, the rightmost waveform always be the newest waveform. Thus the 3D mapping is realized in scan mode, letting the DSO have a fluorescent waveform display at slow time-base.

Method for oscilloscope 3D mapping in scan mode

For the signal under acquisition which varies monotonically before and after the trigger time, a method for full-digital random sampling employs first sampled data before the trigger time and first sampled data after the trigger time to fit a curve, and obtains an intersection point of triggering level and the fitted curve, then, calculates the time interval between sampled data after the trigger time and the intersection point in the end, reconstructs the original signal, i.e. the signal under acquisition by a time interval of each acquisition. Thus, an analog trigger circuit and a time measurement circuit of conventional random sampling system can be eliminated, that simplifies the circuit design of data acquisition system and decreases its hardware complexity. Moreover, the higher sampling rate for the signal under acquisition is attained, and more waveform details are obtained.

Method for full-digital random sampling

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Chengdu, China

Wuhuang Huang