Method and apparatus for frequency triggering in digital oscilloscopes and the like
US5594655A · kind A · utility
17Cited by
15References
38Claims
0Family size
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Inventor
Key dates
| Filing date | Aug 20, 1993 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Aug 20, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R13/345
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A data acquisition system includes an analog to digital converter, a computer processor and a waveform memory in which is stored digital data from the A to D converter corresponding to an input signal. The processor provides a trigger responsive to a characteristic of a frequency component or components of the input signal to cause the memory to save the waveform data in the memory. The frequency characteristic may be determined, for example, by carrying out a synchronized recursive discrete Fourier transform which is updated for the selected frequency component or components with each new sample from the A to D converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.