div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: · 2010-10-08 · • The AMBIENT NOISE CONTROL CIRCUIT ANC functions like high and low filters to cut down background noise it is especially valuable when recording voice • src=https:reader033fdocumentsinreader033viewer20220417135e4940706acc1d22da22f797html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv