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Counts

Counts (also known as ring down counts) are the number of positive threshold crossings of a burst signal.

Parameters

Name	Description	Unit	Limits
threshold	Threshold amplitude	Same unit as signal	(0, $\mathrm{\infty }$)

References

• DIN EN 1330-9
• https://www.nde-ed.org/NDETechniques/AcousticEmission/AE_SignalFeatures.xhtml

Code

INFO

The following snippet is written in a generic and unoptimized manner. The code aims to be comprehensible to programmers familiar with various programming languages and may not represent the most efficient or idiomatic Python practices. Please refer to implementations for optimized implementations in different programming languages.

code.py

import numpy as np


def counts(signal: np.ndarray, threshold: float) -> int:
    if len(signal) == 0:
        return 0
    result = 0
    was_above_threshold = signal[0] >= threshold
    for value in signal[1:]:
        is_above_threshold = value >= threshold
        if not was_above_threshold and is_above_threshold:
            result += 1
        was_above_threshold = is_above_threshold
    return result

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