| 摘要 |
Medical monitoring apparatus to be used in an environment including electrical supply lines of a particular line frequency, for monitoring a particular body activity and for producing an electrical output signal corresponding to the monitored body activity includes: a first filter network connected to receive the electrical output signal and tuned to the line frequency for rejecting the line frequency component of the electrical output signal; a second filter network connected to receive the output of the first filter network and also tuned to the line frequency for rejecting the line frequency component of the electrical output signal; and a high impedance coupling between the first and second filter networks.
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