Occupancy measurement and triggering in frequency domain bitmaps
First Claim
1. A method of measuring an occupancy of an input signal by a test and measurement instrument, comprising:
- accumulating the input signal into a frequency domain bitmap during a measurement period, the frequency domain bitmap including a grid, each cell of the grid including an indication of how many hits occurred in the cell of the accumulated input signal;
outputting the frequency domain bitmap for display to a user;
receiving an input from the user indicating a region of the frequency domain bitmap;
defining a region of interest of the frequency domain bitmap based on the indicated region;
calculating the occupancy of the input signal within the region of interest, wherein the occupancy is indicative of a percentage of hits or time that the input signal occurs within the region of interest, wherein calculating the occupancy of the input signal comprises dividing an amount of time that the input signal is present in the region of interest by the total time of the measurement period; and
outputting the occupancy for additional processing;
wherein the occupancy is continuously calculated and output during the measurement period.
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Abstract
A method is disclosed for triggering upon signal events occurring in frequency domain signals. The method includes repeatedly sampling a time-varying signal and generating a plurality of digital frequency domain spectrums based on the samples of the time-varying signal. A frequency domain bitmap for the time-varying signal is repeatedly updated via application of the digital frequency domain spectrums. The method further includes selecting a portion of the frequency domain bitmap, determining a signal occupancy in the selected portion, and triggering a capture of the time-varying signal based on and in response to the occupancy determination for the selected portion of the bitmap.
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Citations
23 Claims
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1. A method of measuring an occupancy of an input signal by a test and measurement instrument, comprising:
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accumulating the input signal into a frequency domain bitmap during a measurement period, the frequency domain bitmap including a grid, each cell of the grid including an indication of how many hits occurred in the cell of the accumulated input signal; outputting the frequency domain bitmap for display to a user; receiving an input from the user indicating a region of the frequency domain bitmap; defining a region of interest of the frequency domain bitmap based on the indicated region; calculating the occupancy of the input signal within the region of interest, wherein the occupancy is indicative of a percentage of hits or time that the input signal occurs within the region of interest, wherein calculating the occupancy of the input signal comprises dividing an amount of time that the input signal is present in the region of interest by the total time of the measurement period; and outputting the occupancy for additional processing; wherein the occupancy is continuously calculated and output during the measurement period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A test and measurement instrument comprising:
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a signal input configured to receive an input signal; and a processor configured to; accumulate the input signal into a frequency domain bitmap during a measurement period, the frequency domain bitmap including a grid, each cell of the grid including an indication of how many hits occurred in the cell of the accumulated input signal; output the frequency domain bitmap for display to a user; receive input from the user that indicates a region of the frequency domain bitmap; define a region of interest of the frequency domain bitmap based on the indication of the region of interest; determine an occupancy of the input signal within the region of interest, wherein the occupancy is indicative of a percentage of hits or time that the input signal occurs within the region of interest, wherein the processor is further configured to divide an actual number of hits occurring within the region of interest during the measurement period by a maximum number of hits that could have occurred within the region of interest if full occupancy were to have occurred during the measurement period to calculate the occupancy of the input signal within the region of interest; and output the occupancy for additional processing; wherein the processor is further configured to repeatedly determine and output the occupancy during the measurement period. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A test and measurement instrument comprising:
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a signal input configured to receive an input signal; and a processor configured to; accumulate the input signal into a frequency domain bitmap during a measurement period, the frequency domain bitmap including a grid, each cell of the grid including an indication of how many hits occurred in the cell of the accumulated input signal; output the frequency domain bitmap for display to a user; receive input from the user that indicates a region of the frequency domain bitmap; define a region of interest of the frequency domain bitmap based on the indication of the region of interest; determine an occupancy of the input signal within the region of interest by dividing an actual number of hits occurring within the region of interest during the measurement period by a maximum number of hits that could have occurred within the region of interest if full occupancy were to have occurred during the measurement period; and output the occupancy for additional processing; wherein the processor is further configured to repeatedly determine and output the occupancy during the measurement period.
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Specification