System and method for filtering electrophysiological signals

A method of filtering an electrophysiological signal, comprising:

• acquiring a signal indicative of electrophysiological activity;
• inputting the signal indicative of electrophysiological activity to signal processing hardware, and, using the signal processing hardware:
• applying a wavelet transform to transform the acquired signal into the wavelet domain;
• applying a wavelet filter to separate the transformed signal into a hard component and a soft component;
• applying a notch filter to the soft component;
• and
• combining the hard component and the filtered soft component into an output signal.

A method of filtering an electrophysiological signal, comprising:

• acquiring a signal indicative of electrophysiological activity;
• inputting the signal indicative of electrophysiological activity to signal processing hardware, and, using the signal processing hardware:
• applying a wavelet transform to transform the acquired signal into the wavelet domain;
• applying a wavelet filter to extract a soft component from the transformed signal;
• applying a filter to the soft component to isolate an interference signal;
• and
• producing an output signal comprising the acquired signal filtered to eliminate the interference signal.

A method of filtering an electrophysiological signal, the method comprising:

• acquiring a signal indicative of electrical activity in cardiac tissue;
• inputting the signal indicative of electrical activity in cardiac tissue to signal processing hardware, and, using the signal processing hardware:
• applying a wavelet transform to transform the acquired signal into the wavelet domain;
• applying a wavelet filter to extract a soft component from the transformed signal;
• applying a filter to the soft component to extract an interference signal;
• adjusting the interference signal to be in phase with the acquired signal;
• and
• subtracting the adjusted interference signal from the acquired signal to produce an output signal.

A system for filtering an electrophysiological signal, comprising:

• a signal acquisition device configured to acquire a signal indicative of electrophysiological activity;
• a wavelet transformation processor that transforms the acquired signal into the wavelet domain;
• a first filtering processor that extracts a soft component from the transformed signal;
• a second filtering processor that isolates an interference signal;
• and
• a signal reconstruction processor that produces an output signal comprising the acquired signal filtered to eliminate the interference signal.