Preamplifier and filter were used for cancellation of respiratory ECG, body interference.
利用前置放大器和滤波器有效滤除掉呼吸，心电，人体等干扰。
In this paper, the preamplifier circuit and the methods of anti-interference used for the portable ECG monitor were introduced. In this circuit, single power supply was be used.
本文介绍了在一种新型便携式心电监护仪器中是如何采用单极性供电方式实现前置放大电路。
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