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Class signal is TSTOOL's main class. Objects of this type model real world signals. A signal does not only store the pure sample values, it holds much more information like axes, units of sample values or the axes units, and even more descriptive information like labels, command lines and a processing history.
The majority of functions in the tstoolbox take a signal as input argument and return a processed signal as output. This allows for combining or chaining of several processing steps in order to get the desired output.