Display method for signal analyzer
First Claim
Patent Images
1. A method for a signal analyzer of displaying a signal under test comprising the steps of:
- displaying data for the signal under test as a graph on a screen having time and frequency axes;
displaying a marker having variable time and frequency scales on the graph;
designating as desired data the data within the marker; and
displaying a sub-graph relating to the desired data;
wherein the designating step comprises the steps of;
selecting the data for signal under test from the time scale;
filtering the selected data according to the width of the frequency scale; and
shifting the filtered data by a difference between a center frequency of a span on the graph and a center frequency of the marker.
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Abstract
A rectangle marker on a display of a signal analyzer simultaneously designates time and frequency intervals of data from a signal under test for analysis. The data of the signal under test is displayed as a graph having time and frequency axes. Sub-graphs show data designated by the rectangle marker as processed in the time domain, frequency domain and modulation domain. The resulting display provides an overview of the signal under test and simultaneously provides displays of measurements and analyzes for a designated portion of the data.
27 Citations
8 Claims
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1. A method for a signal analyzer of displaying a signal under test comprising the steps of:
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displaying data for the signal under test as a graph on a screen having time and frequency axes; displaying a marker having variable time and frequency scales on the graph; designating as desired data the data within the marker; and displaying a sub-graph relating to the desired data; wherein the designating step comprises the steps of; selecting the data for signal under test from the time scale; filtering the selected data according to the width of the frequency scale; and shifting the filtered data by a difference between a center frequency of a span on the graph and a center frequency of the marker. - View Dependent Claims (2, 3, 4)
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5. A signal analyzer comprising:
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means for producing frequency domain data from time domain data for a signal under test; means for displaying the frequency domain data as a graph as a function of time; means for designating via a marker on the graph desired data by variable time and frequency scales; and means for displaying a sub-graph relating to the desired data; wherein the means for designating comprises; means for selecting the data for the signal under test from the time scale; means for filtering the selected data according to the width of the frequency scale; and means for shifting the filtered data by a difference between a center frequency of a span on the graph and a center frequency of the marker. - View Dependent Claims (6, 7, 8)
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Specification