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In this report, improvement in sound insulation of a ventilation opening by using the Active Noise Control(ANC) technology, which in general has excellent performance in the control of lower frequency... noise, is considered. Firstly, model experiments are conducted in order to confirm the quantitative performance of ANC against a ventilation opening. The results show that ANC can insulate about 30 dB from steady noise in one-third-octave band with center frequency of 500 Hz passing through a ventilation opening. Then a practical effect is measured to verify the ability to control noise in an actual experimental house. As a result, it is found that the sound insulation by ANC is also effective in ventilation openings of actual houses.show more
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jaud010_p065