| 摘要 |
<p>In the present specification, disclosed are a method and a system which includes a depletion mode switch which transmits an audio signal from an input terminal to an output terminal in a low impedance state if power is lower than a threshold value and blocks the audio signal from the output terminal to the input terminal in a high impedance state if the power is higher than the threshold value and a noise canceling circuit which receives the audio signal from the input terminal and supplies a modulated audio signal to the output terminal if the power is higher than the threshold value. [Reference numerals] (110) Depletion mode switch;(111) Charge pump & control;(115) Noise canceling circuit</p> |
