Patent ID: 8594172

Claim:
An apparatus comprising: a first circuit configured to receive a signal, wherein low frequency content of said signal is attenuated due to high pass filtering by a medium carrying said signal and a coupling; and a second circuit configured to automatically set a gain of a baseline wander correction loop to restore said low frequency content in said signal based upon a sample taken from a first point in a signal pathway of said first circuit, wherein said low frequency content in said signal is restored by adding a feedback signal generated by said second circuit to a second point in the signal pathway of said first circuit, said second circuit comprises (i) a first low pass filter, (ii) a second low pass filter, (iii) a multiplier, and (iv) a gain adaptation circuit, said first low pass filter and said second low pass filter are configured to generate a first baseline wander correction signal and a second baseline wander correction signal respectively, in response to said sample taken from said first point in said signal pathway of said first circuit, said multiplier is configured to generate said feedback signal by scaling said second baseline wander correction signal based upon said gain of said baseline wander correction loop, and said gain adaptation circuit is configured to set said gain of said baseline wander correction loop in response to said first baseline wander correction signal and an error signal.