Automatic generation of frequency domain mask
AssigneeTektronix, Inc.
InventorsIan S. Dees, Craig D. Bryant, Lynne A. Fitzsimmons
Life of this patent
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Abstract
Automatic generation of a frequency domain mask is achieved by drawing a reduced waveform representing frequency domain data for an input signal as a pixel map. The reduced waveform is blurred by applying a user selected frequency offset, and from the blurred waveform data points are selected to generate upper and lower limits. The selected upper limit data points form an upper limit mask and the lower limit data points form a lower limit mask. When the upper and lower limit data masks are combined and translated back to frequency/amplitude units from the pixel map, they form an envelope mask.
Claims3
A method of auto-generating a frequency domain mask for a selected input signal comprising the steps of:
- reducing frequency domain data representing the selected input signal to fit within a pixel map by converting frequency/amplitude units to pixel units in the pixel map to produce a reduced waveform;
- drawing the reduced waveform within the pixel map using a user selected frequency offset to produce a blurred waveform;
- selecting data points for the mask from the blurred waveform;
- converting the data points from the pixel map to frequency/amplitude units to produce the mask;
- and
- adjusting the mask using a user selected amplitude offset to produce a final mask.
Dependencies are inferred from the claim text.