Control of a muffler based on H/sub 2/ control theory

The problems of noise and echo-sound inside or outside the room are increasing recently. The solutions of these problems are indispensable in order to keep our comfortable life. In this paper, we have tried to control the sound at the exit of a pipe using H/sub 2/ control theory. And, the pipe controlled by H/sub 2/ control theory and the muffler not controlled are compared. As a result, we have confirmed the effect better than the muffler when using the pipe by H/sub 2/ control.