An apparatus, method, and system for providing dc offset reduction in a communications channel include two or more feedback loops to generate dc offset correction signals, which in turn are combined with an input analog signal and a processed digital signal thereby reducing dc offset. Each feedback loop may include an adaptive filter. At least one feedback loop may be responsive to an error signal that represents the difference between the delayed input of a first detector, and its output. Further, the dc offset correction signal, partially delayed, may be added to the error signal, thereby improving the response time of the dc offset correction loop.

 
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< Testing the electrical continuity of the connecting cables for a recorder of physiological signals, in particular a holter recorder of ECG signals

< Efficient methods for filtering to avoid inter-symbol interference and processing digital signals having large frequency guard bands

> Demodulation apparatus

> Electrophysiology mapping system

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