一般的に共振系を推定する場合,動作の安定性からFIRフィルタが用いられる.しかし,非常に多くのタップ数を必要とするため，多大な計算量を要する．そこで，本論文ではFIRフィルタに安定性を考慮したIIRフィルタが直列接続された構造を共振系を模擬する構造として同定する手法を提案する．適応フィルタには，FIRフィルタに巡回型フィルタまたは再帰型ラティスフィルタが直列接続された構造の2種類を用いて性帝比較を行う．さらに，再帰型ラティスフィルタの係数感度が低いため，未知系が高次になっても安定に動作すると考えられる．%A FIR filter generally is used from the stability of the movement,when resonated system is estimated. But, the great amount of calculation is needed. Because very many taps are necessary for the FIR filter. So, The technique to identify the unknown system which imitated system resonated is proposed by this thesis. This unknown system is the structure that non-recursive type is connected to recursive type in series. Two kinds of the adaptation digital niters are used, when it identify unknown system. One is the structure that IIR filter is connected to FIR filter and the other is the structure that recursive lattice filter is connected to FIR filter. Then, performance compares both the adaptation digital filters. Even if unknown system becomes the high degree, it can think that it works in the stability. Because the coefficient sensitivity of recursive lattice filter is poor.
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