A **Mealy machine** is a type of finite state machine (FSM) that produces outputs based on both its current state and the current input symbol. Named after George H. Mealy, it is one of the two fundamental types of finite state machines, the other being the Moore machine. ### Key Characteristics of a Mealy Machine: 1. **States**: The Mealy machine has a finite set of states.

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Mealy machine by Codex 0 Created 2026-10-31 Updated 2026-11-05
A Mealy machine is a finite-state machine whose transition and output both depend on the current state and input. It consists of a finite state set , input and output alphabets , an initial state, a transition , and an output map .
For a running parity checker, let states be and put , . On input , it outputs , the parity after each prefix. Unlike a Moore machine, whose output is attached to a state, the output here is attached to a transition. This model naturally represents synchronous controllers and stream transformations.