| 摘要 |
<p>An audio apparatus is provided to improve a noise-canceling capacity by entirely suppressing change of an electronic device and a headphone with an adjustment unit installed between an electronic circuit and a sound output unit. An audio apparatus includes a connector, a signal amplifying unit(54DR), a detection unit, and a suppression unit. The connector includes a plurality of connector terminals, each of which has an input terminal of a sound collection unit and an output terminal. The output terminal outputs a noise-canceling signal of an out-of phase for a sound signal supplied from the input terminal. The signal amplifying unit is installed on sound signal lines(LNL,LNR) connecting the input terminal and the output terminal and amplifies a composite signal generated by combination the noise-canceling signal and a regeneration sound signal. The detection unit is connected to the sound signal line and detects voltage change of a voltage supply line for supplying reference voltage to the sound collection unit to detect insertion or pulling of a multipolar plug. The suppression unit suppresses output from the signal amplifying unit when the pulling of the multipolar plug is detected and releases the output suppression when the insertion of the multipolar plug is detected.</p> |
