| 摘要 |
The noise cancellation system comprises an input 40, 41, 42 for receiving a digital signal; a digital filter 44 having at least a high pass filter characteristic receiving the digital signal and generating a filter output signal; and an amplitude detector 60 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 cutoff frequency thereof. |
