| 摘要 |
Apparatus and method for removing coherent noise from an electrical signal, such as powerline noise, and operating in real time. An operational amplifier with digital filter and a low pass filter in the feedback loop, with the digital filter providing a feedback signal corresponding to the coherent noise in the absence of the desired signal. In the preferred embodiment, an integrating type digital filter with digital memory, and alternative embodiments with condenser memory. |
