Dual dolby* b-type noise reduction circuit/ automatic music search/ with differential outputs and mute<br>Dual dolby* b-type noise reduction circuit, automatic music search,with differential outputs and mute(带差分输出和静音的双路杜比b类型降噪电路及自动音乐搜<br>Dual dolby* b-type noise reduction circuit, automatic music search, with differential outputs and mute<br>