Filtering device for recording electrophysiological signals

A switchable filter device for use in a system for recording intracardiac electrophysiological signals at intracardiac locations, the filter device comprising:

• a plurality of recording channels, the recording channels comprising at least one ablation recording channel, wherein each recording channel has a patient side terminal at a patient interface and a corresponding recording side terminal at a recording device interface;
• wherein
• the filter device further comprises a detection device configured for monitoring for a transient interference signal and providing a control signal indicative of a status of the transient interference signal;
• and
• each recording channel comprises a first signal path with a first frequency dependent transmission characteristic having a first pass band, a second signal path with a second frequency dependent transmission characteristic different from the first frequency dependent transmission characteristic, the second frequency dependent transmission characteristic having a second pass band overlapping the first pass band, and switching devices operable to switch between the first signal path and the second signal path in response to the control signal, wherein switching from the circuit configuration of the second signal path to the circuit configuration of the first signal path is performed with a switching delay.