1.This technique develops multifunction caps for industryagriculture. The cap is comfortable to wear, not like ear-plugs. 
2.We have developed both digitalanalog based ANC techniques. Broadband noise cancellation can be up to 3kHz.
3.The virtual sensing technique can move the quiet zone to the ear, not at the error microphone. The band-selecting technique helps to cancel the noise but k

1. Both our analogdigital based ANC techniques can cancel broadband noise up to 3kHz, which outperforms with the brand leading companies like Bose, Sony3M.
2. Bandselecting function can decide the frequency band to be cancelednot to be canceled. So, we can cancel noise but keep voice.
3.Virtual sensing technique can move the quiet zone to the ear but not like usual ANC cases at erro

The proposed technique can be applied to industryagriculture to protect worker＇sfarmer＇s hearing. In the future, we can consider to integrate our technique with earphoneheadrest.