SYSTEM AND METHOD FOR GENERATING TRIGGERS BASED ON PREDETERMINED TRIGGER WAVEFORM AND A MEASUREMENT SIGNAL
First Claim
1. In a measurement system a method for capturing a waveform contained in an input signal, the method comprising:
- generating a plurality of digital samples from the input signal;
providing a predetermined trigger waveform having a frequency spectrum that substantially matches that of the waveform contained in the input signal; and
correlating the predetermined trigger waveform with the plurality of digital samples to identify a trigger point time when the input signal contains the waveform.
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Accused Products
Abstract
A test measurement system and method which uses parallel digital samples of an input measurement signal to determine a trigger point for a predetermined trigger waveform. The system correlates the predetermined trigger waveform with digital samples of the input measurement signal. The result of this correlation is then used to identify a trigger point. Generally the point in time where the trigger waveform has the strongest correlation with the digital samples identifies the desired trigger point. This trigger point is then used to identify the selected measurement data, where the selected measurement data corresponds to the digital samples obtained at the trigger point time.
74 Citations
22 Claims
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1. In a measurement system a method for capturing a waveform contained in an input signal, the method comprising:
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generating a plurality of digital samples from the input signal;
providing a predetermined trigger waveform having a frequency spectrum that substantially matches that of the waveform contained in the input signal; and
correlating the predetermined trigger waveform with the plurality of digital samples to identify a trigger point time when the input signal contains the waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A measurement system which uses digital samples of an input signal to generate a trigger point, the system comprising:
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an analog to digital converter which operates to generate a plurality of digital samples from the input signal, wherein the digital samples include a waveform of interest;
a predetermined trigger waveform generator, which generates a predetermined trigger waveform that has a correlation to the waveform of interest;
a correlator which correlates the predetermined trigger waveform with the plurality of digital samples; and
an analyzer which operates to analyze an output of the correlator to identify a trigger point which is used for identifying the waveform of interest in the plurality of digital samples. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of generating a trigger to capture a signal waveform contained in an input signal, the method comprising:
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sequentially sampling the input signal to generate a plurality of waveform samples staggered in time with respect to each other;
providing a trigger waveform having a waveshape approximating that of the signal waveform contained in the input signal;
correlating the trigger waveform with each of the plurality of waveform samples to identify a specific waveform sample that provides the highest degree of correlation;
generating a trigger upon identifying the specific waveform sample;
operating the trigger to capture the specific waveform sample; and
using the specific waveform sample to obtain information of the signal waveform. - View Dependent Claims (19, 20, 21, 22)
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Specification