Method and apparatus for DC compensation

摘要

A DC compensation module for suppressing the DC content of a signal containing a periodic sequence comprises a signal transport path (10), a signal compensation path (13) and a combination unit (11). The signal transport path (10) transfers the signal from the input of the module to an input on the combination unit (11). The signal compensation path (13) is coupled to another input on the combination unit (11), and is provided with a low pass filter (14; 17) filtering a signal transferred via the signal compensation path (13). The low pass filter (14; 17) of the signal compensation path (13) is provided with a notch (20) at a frequency corresponding to the period of the periodic signal. The combination unit (11) supplies a signal in response to the difference between the signals received from the signal transport path (10) and from the signal compensation path (13).