Noise and jitter compensation and signal processing of equivalent-time waveforms

A system for digital signal processing of equivalent-time waveforms, comprising:

• an input interface configured to receive a digitized equivalent-time waveform of a repeating signal under test (SUT);
• a processor configured to:
• apply a low-pass filter to the digitized equivalent-time waveform to obtain a smoothed waveform,
• calculate a residual waveform by subtracting the smoothed waveform from the digitized equivalent-time waveform,
• estimate contributions of multiple noise sources in the residual waveform using a regression model, and
• reconstruct a corrected waveform by combining the smoothed waveform with a scaled version of the residual waveform, wherein the scaling is based on the estimated noise source contributions;
• and
• an output interface configured to output the corrected waveform.

A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform digital signal processing operations for enhancing fidelity of equivalent-time waveform measurements, the digital signal processing operations comprising:

• receiving a digitized equivalent-time waveform of a repeating signal under test (SUT);
• applying a low-pass filter to the digitized equivalent-time waveform to obtain a smoothed waveform;
• generating a residual waveform by subtracting the smoothed waveform from the digitized equivalent-time waveform;
• estimating contributions of multiple noise sources in the residual waveform using a regression model;
• and
• reconstructing a corrected waveform by combining the smoothed waveform with a scaled version of the residual waveform, wherein the scaling is based on the estimated noise source contributions.