Abstract
In an ordinary active noise control (ANC), an error microphone is settled in the control area but it can be an obstacle of human movement. We proposed Virtual Microphone System (VMS) that an error signal can be obtained from the error microphone settled out of the control area. We applied VMS to Active Sound Shielding and succeeded in the reduction of the noise. The effect of the reduction is approximately 16.4dB. We measured the sound pressure distribution in the control area and analyzed the acquired data in the octave band of 125Hz to 2kHz. From the measurement, an enough control effect was obtained in frequency bands of 250, 500, 1k and 2kHz.
