Physiological measurement device, system and method

A physiological measurement device comprising:

• multiple input channels configured to obtain multiple measurement signals (si) acquired from a subject;
• a recorder configured to filter the multiple measurement signals (si) by use of a digital filter and calculate multiple vector signals (yi) from the multiple filtered measurement signals, wherein a vector signal represents a differential signal and is calculated by forming a linear combination of at least two filtered measurement signals;
• a stimulator configured to generate one or more stimulation signals (wk) for electrically stimulating tissue of the subject;
• multiple output channels configured to output the multiple vector signals (yi) and the one or more stimulation signals (wk);
• and
• a processor configured to determine adjusted filter coefficients of the digital filter during or after the generation and output of the one or more stimulation signals (wk) based on the current filter coefficients, the one or more stimulation signals (wk) and the multiple measurement signals (si) acquired while the one or more stimulation signals (wk) are outputted for stimulation,
• wherein the digital filter is configured to filter the multiple measurement signals, after the adjusted filter coefficients have been determined, by use of the adjusted filter coefficients.