Overlapped fast fourier transform based measurements using flat-in-time windowing
AssigneeKeysight Technologies, Inc.
InventorsJoseph M. Gorin, Michael E. Barnard
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Abstract
An electromagnetic interference (EMI) signal is processed by digitizing the EMI signal, generating a plurality of overlapping time records from the digitized EMI signal, applying a window function to the plurality of overlapping time records to produce a plurality of modified time records, wherein the window function has a substantially flat top, and performing a fast Fourier transform (FFT) on each of the modified time records to produce a plurality of corresponding amplitude envelopes.
Claims20
A method of processing an electromagnetic interference (EMI) signal, comprising:
- digitizing the EMI signal;
- generating a plurality of overlapping time records from the digitized EMI signal;
- applying a window function to the plurality of overlapping time records to produce a plurality of modified time records, wherein the window function has a substantially flat top;
- and
- performing a fast Fourier transform (FFT) on each of the modified time records to produce a plurality of corresponding amplitude envelopes.
A system configured to process an electromagnetic interference (EMI) signal, comprising:
- an analog to digital converter (ADC) configured to digitize the EMI signal;
- and
- a digital signal processing (DSP) component configured to generate a plurality of overlapping time records from the digitized EMI signal, apply a window function to the plurality of overlapping time records to produce a plurality of modified time records, wherein the window function has a substantially flat top, and perform a fast Fourier transform (FFT) on each of the modified time records to produce a plurality of corresponding amplitude envelopes.
Dependencies are inferred from the claim text.