抄録
A feedback control has an advantage in that it doesn't need a reference microphone. However, an usual feedback control system isn't obtained a control effect at an evaluating point apart from a control source. Nakashima et al proposed the feedback control system which can rise an output from a control source. It's called the distant control system in this paper. The effectiveness of this system has confirmed in numerical calculation that controlling at an evaluating point. Accordingly, when we actually confirmed the effectiveness of this system through the experiment, it improved a control effect 1.9 dB than usual at the evaluating point located 200mm from an error microphone. Besides, to expand the control area, we apply the distant control system to the multi channel control. A crosstalk canceller is introduced to the system for preventing a deterioration of a control effect due to a crosstalk. As a result of the measurment in the control area, we confirmed that the control area was expanded by the multi channel control.
