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Chapter 9. Parameters and States

Authors: Joseph T. Buck
Other Contributors: Neil Smyth
A State is a data structure associated with a block, used to remember data values from one invocation to the next. For example, the gain of an automatic gain controller is a state. A state need not be dynamic; for instance, the gain of fixed amplifier is a state. A parameter is the initial value of a state. A State actually has two values: the initial value, which is always a character string, and a current value, whose type is different for each derived class of State: integer for IntState, an array of real values for FloatArrayState, etc. In addition, states have attributes, which represent logical properties the state either has or does not have.

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