Class and some supporting functions for representing and manipulating
system functions.
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Cascade(sf1,
sf2)
Returns:
SystemFunction representing the cascade of
sf1 and sf2
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FeedforwardAdd(sf1,
sf2)
Returns:
SystemFunction representing the sum of sf1
and sf2; this models the situation when the two
component systems have the same input and the output of the whole
system is the sum of the outputs of the components. |
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FeedforwardSubtract(sf1,
sf2)
Returns:
SystemFunction representing the difference of
sf1 and sf2; this models the situation when
the two component systems have the same input and the output of the
whole system is the output of the first component minus the output of
the second component. |
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FeedbackSubtract(sf1,
sf2=None)
Returns:
SystemFunction representing the result of feeding the
output of sf1 back, with (optionally) sf2
on the feedback path, subtracting it from the input, and feeding the
resulting signal into sf1. |
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FeedbackAdd(sf1,
sf2=None)
Returns:
SystemFunction representing the result of feeding the
output of sf1 back, with (optionally) sf2
on the feedback path, adding it to the input, and feeding the
resulting signal into sf1. |
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Sum(sf1,
sf2)
Returns:
SystemFunction representing the system that sums the
outputs of the two systems |
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Gain(k)
Returns:
SystemFunction representing a system that multiplies the
input signal by k. |
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R()
Returns:
SystemFunction representing a system that delays the
input signal by one step. |
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periodOfPole(p)
Returns:
period = 2 pi / phase of pole or None (if phase is 0) |
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complexPolar(p)
Returns:
polar representation as a pair of r, theta |
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