Tracking coverage artifacts for periodic signals using sequence-based abstractions

A signal processing device, comprising:

• a memory that stores computer-executable instructions;
• a processor that executes the computer-executable instructions to perform operations, comprising:
• sampling a signal to abstract it as an ordered set of a sequence of literals that correspond to a time stamps in a first time period;
• iteratively determining whether a sub-sequence of literals repeats in a first window of time within the first time period, wherein after every iteration, the first window of time is lengthened;
• determine a frequency of a periodic coverage artifact of the signal based on a length of time between repeating sub-sequences of literals;
• uniformly resampling the signal in a second window of time to determine a temporary reference voltage that is a mean of all samples in the second window of time;
• determining a list of reference values for a set of time periods, wherein a reference value of the list of reference values is a mean of each sample in a respective time period, wherein each time period of the set of time periods is defined by consecutive positive level crossings of the temporary reference voltage;
• and
• determining a Direct Current (DC) reference based on a median of the list of reference values.

A non-transitory computer-readable medium comprising computer executable instructions, that when executed by a processor, perform operations, comprising:

• sampling a signal to abstract it as an ordered set of a sequence of literals that correspond to a time stamps in a first time period;
• iteratively determining whether a sub-sequence of literals repeats in a first window of time within the first time period, wherein after every iteration, the first window of time is lengthened;
• determine a frequency of a periodic coverage artifact of the signal based on a length of time between repeating sub-sequences of literals;
• uniformly resampling the signal in a second window of time to determine a temporary reference voltage that is a mean of all samples in the second window of time;
• determining a list of reference values for a set of time periods, wherein a reference value of the list of reference values is a mean of each sample in a respective time period, wherein each time period of the set of time periods is defined by consecutive positive level crossings of the temporary reference voltage;
• and
• determining a Direct Current (DC) reference based on a median of the list of reference values.