Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1988-03-21
1989-06-27
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
324 77G, 340722, 364819, G01R 2500, G01R 2504
Patent
active
048433098
ABSTRACT:
A method and an apparatus detect the presence of and correct for timing misalignment between waveforms acquired by digital oscilloscopes. In a preferred embodiment, a digital oscilloscope (50) includes a waveform alignment system (60) that receives a first waveform (86) and a similar second waveform (88) of a periodic electrical signal. A digital signal processor (80) of the waveform alignment system generates an autocorrelation value in connection with the first waveform and a first cross-correlation value in connection with the first and second waveforms and compares the values to determine whether they differ by more than a preselected tolerance, thereby to detect a timing misalignment between the first and second waveforms. Upon detection of a timing misalignment, the digital signal processor computes a shifted second waveform by changing the timing relationship of the second waveform relative to the first waveform and generates a second cross-correlation value in connection with the first waveform and the shifted second waveform. The digital signal processor shifts the second waveform relative to the first waveform such that the second cross-correlation value differs from the autocorrelation by less than the preselected tolerance, thereby to correct the timing misalignment.
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Kareem Arif
Knierim Daniel G.
Walker George S.
Burns W.
Eisenzopf Reinhard J.
Meininger Mark M.
Meza Peter J.
Tektronix Inc.
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