Multipoint control method is method of playing sound in any direction. Although this method can reduce the sound pressure outside the target direction, there is not significant degradation in speech quality. Therefore, there is a problem of leaking of the contents of speech. As the measures, signal decomposition method such as random vector decomposition or noise-driven decomposition is proposed. However, these methods are incompatible with keeping speech quality of the target direction and low-articulation of speech in the outside of target direction. In this paper, we propose the residual decomposition method and achieve sound reproduction in the limited area by keeping quality of the target direction and low-articulation in the outside of the target direction.%音を任意の方向に再生する多点制御法は，目的方向外で音圧を低減させることが出来るが，音質に関しては大きな劣化がないため，音声内容が漏洩してしまう可能性がある.その対策としてランダムベクトル分解法ゃノィズ駆動分解法などの信号分解手法が提案されている.しかし，この両手法は目的方向での音質維持と目的方向外での低明瞭度化の両立が困難であるという課題があった.そこで本報告では，音声の残差信号分解法を提案し，目的方向での音質維持と目的方向外での低明瞭度化により音のエリァ再生を実現する.
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