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Antiphase sound generator
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High-speed airflow noise preventing microphone device
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Primary propagation sound erasing microphone apparatus
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Silent wall surface of tunnel
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Reflector type silencing pipe
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Active noise elimination controller of directly emitted noise
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Speaker enclosure and speaker for active control of diffraction sound
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Foot-eliminate filter circuit
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Apparatus for reducing rotation noise
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Noise removing appliance
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Muffling device
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Double reflection sound absorbing plate
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Acoustic door
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Method for reducing high-speed air flow sound for high-speed traveling vehicle
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Amplitude/phase adjustment device
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Active narrow directivity speaker system
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