| 摘要 |
<p>There is provided a noise cancellation system, comprising: an input, for receiving a digital signal; a digital filter, having at least a high pass filter characteristic, for receiving the digital signal and generating a filter output signal; and an amplitude detector, for generating a detection signal based on an amplitude of a representation of said filter output signal, wherein the detection signal is applied to the digital filter to control a cut- off frequency thereof.</p> |
