Power line interference compensation in PCM upstream transmissions
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United States of America Patent
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N/A
Issued Date -
Oct 16, 2003
app pub date -
Apr 15, 2002
filing date -
Apr 15, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The present invention relates to a method for filtering and compensating power line interference and DC distortion in PMC upstream data transmissions. To reduce effects of power line interference and DC distortion, the preferred embodiment of the present invention implements extremely narrow IIR notch filters, nominally at 0 Hz, 60 Hz, and 180 Hz (and optionally at 300 Hz) if interference at these frequencies is detected. These filters cause very little distortion. Then, because power line frequencies may drift from their nominal frequencies of the filters are adapted to track the exact frequencies. To effectiveliy eliminate the distortion caused by the IIR filter, the data mode transmit equalizes is adjusted.
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