The LPC analysis conducted on each of the time sequences of four articulatory parameters, two for the tongue and two for the mandible and lips, produces the respective autoregressive linear system. These are the dynamical models of articulation in this study. Their structures are examined with change of mode of utterance, such as word utterances and a sentence utterance. Then, the input pulses to drive each linear system are searched for from view point of devising a rule synthesis of the parameter. The search finds more efficient sequences of the pulses than AR residual pulses which is the basic criterion adopted in this study. A scrutiny of the planer plot of the driving pulses for the word utterances differentiate even tense-lax pairs, /t/-/d/ and /s/-/z/.