Systems and methods for detecting signal extremum

A non-transitory machine-readable medium including instructions, which when executed by a machine, cause the machine to perform a method comprising:

• accessing a series of data samples from a sensor signal;
• finding a local extremum in the series of data samples, wherein at least one data sample immediately preceding the local extremum approaches the local extremum from a first direction and at least one data sample immediately succeeding the local extremum recedes from the local extremum toward the first direction;
• determining a difference between the local extremum and the series of data samples subsequent to and receding from the local extremum toward the first direction;
• comparing the difference to a predefined threshold;
• and
• writing extremum data into storage when the difference exceeds the predefined threshold.

A system, comprising:

• data acquisition circuitry configured to access a series of data samples from a sensor signal;
• local extremum detection circuitry configured to find a local extremum in the series of data samples, wherein at least one data sample immediately preceding the local extremum approaches the local extremum from a first direction and at least one data sample immediately succeeding the local extremum recedes from the local extremum toward the first direction;
• difference monitoring circuitry configured to determine a difference between the local extremum and the series of data samples subsequent to and receding from the local extremum toward the first direction;
• comparator circuitry configured to compare the difference to a predefined threshold;
• and
• extremum data recorder circuitry configured to write extremum data into storage when the difference exceeds the predefined threshold.