| 摘要 |
An apparatus for filtering radio frequency interference in a signal transmitted on a twisted-pair communication channel such as an ADSL transmission line. The apparatus comprises a filter adapted to be selectively engaged in-line with the communication channel by a switch or switches when the differential mode noise in any predetermined frequency sub-band exceeds a threshold noise level, or the sum of the sub-band noise signals exceeds a wide-band threshold noise value. When the filter is not engaged, it is isolated from the communication channel by a bypass switch or pair of bypass switches.
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