Occupancy measurement and triggering in frequency domain bitmaps
First Claim
1. A method for triggering upon signal events in a frequency domain test and measurement device, comprising:
- repeatedly sampling a time-varying signal;
generating, over time, a plurality of digital frequency domain spectrums based on sampling of the time-varying signal;
repeatedly updating a frequency domain bitmap for the time-varying signal by sequentially applying the digital frequency domain spectrums to a data store containing the frequency domain bitmap, including;
increasing hit counts in portions of the frequency domain bitmap when the digital frequency domain spectrums include components occurring within such portions of the frequency domain bitmap, andperiodically decreasing accumulated hit counts in the frequency domain bitmap;
selecting a portion of the frequency domain bitmap;
determining a signal occupancy within the portion of the frequency domain bitmap; and
triggering a capture of the time-varying signal in response to the signal occupancy determined for the portion of the frequency domain bitmap.
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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
19 Claims
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1. A method for triggering upon signal events in a frequency domain test and measurement device, comprising:
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repeatedly sampling a time-varying signal; generating, over time, a plurality of digital frequency domain spectrums based on sampling of the time-varying signal; repeatedly updating a frequency domain bitmap for the time-varying signal by sequentially applying the digital frequency domain spectrums to a data store containing the frequency domain bitmap, including; increasing hit counts in portions of the frequency domain bitmap when the digital frequency domain spectrums include components occurring within such portions of the frequency domain bitmap, and periodically decreasing accumulated hit counts in the frequency domain bitmap; selecting a portion of the frequency domain bitmap; determining a signal occupancy within the portion of the frequency domain bitmap; and triggering a capture of the time-varying signal in response to the signal occupancy determined for the portion of the frequency domain bitmap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for triggering upon signal events occurring in frequency domain signals, comprising:
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a storage subsystem for storing a frequency domain bitmap of a time-varying signal, where the frequency domain bitmap is repeatedly updated by applying digital frequency domain spectrums to the frequency domain bitmap that are generated through repeated sampling of the time-varying signal; a processing subsystem operatively coupled with the storage subsystem; and bitmap instructions executable by the processing subsystem to; implement display persistence in the frequency domain bitmap by; increasing hit counts in portions of the frequency domain bitmap when the digital frequency domain spectrums which are applied to the frequency domain bitmap include components occurring within such portions of the frequency domain bitmap; and periodically decreasing accumulated hit counts in the frequency domain bitmap select a portion of the frequency domain bitmap; determine a signal occupancy within the portion of the frequency domain bitmap; and trigger a capture of the time-varying signal in response to the signal occupancy determined for the portion of the frequency domain bitmap. - View Dependent Claims (13, 14, 15, 16)
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17. An frequency domain test and measurement device, comprising:
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a front end section for receiving a time-varying signal; a real-time engine operatively coupled with the front end section and configured to generate digital frequency domain spectrums based on the time-varying signal as the time-varying signal is received and processed through the front end section; a memory subsystem containing a frequency domain bitmap which is updated through sequential receipt and storage of the digital frequency domain spectrums; a display subsystem for displaying a displayable representation of the bitmap; and a processing subsystem configured to execute bitmap instructions which are operable to; implement display persistence for the displayable representation of the bitmap by periodically decreasing accumulated hit counts in the frequency domain bitmap, such that a transient signal event occurring in one display frame of the displayable representation is displayed but successively attenuated over one or more successive display frames; select a portion of the frequency domain bitmap; determine a signal occupancy within the portion of the frequency domain bitmap; and trigger a capture of the time-varying signal in response to the signal occupancy determined for the portion of the frequency domain bitmap. - View Dependent Claims (18, 19)
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Specification