Arithmetics
The following arithmetic operations are supported:
Symbol 
Name 


Addition 

Subtraction 

Multiplication 

Division 

Exponentiation 
These operations are used as ordinary arithmetical operators:
signal_1 + signal_2
In addition, the following arithmetic operations are supported:
 signal.log()
Calculate the natural logarithm of the signal.
 signal.exp()
Apply the exponential function to the signal.
For each value in the original signal, the result is calculated as the base of the natural logarithm, e ≈ 2.71, raised to the power of the original value.
 signal.abs()
Calculate the absolute values of the signal.
 signal.sign()
Calculate the sign of the signal values.
For each value in the original signal, the sign is +1 if the original value is positive, 1 if the original value is negative, and 0 if the original value is 0.