A system (100; 500) for acquiring an electrical signal, said system comprising: a plurality of electrodes (102; 502), each being configured to acquire an electrode signal; a plurality of signal quality detectors (104; 504), each signal quality detector (104; 504) being associated with at least a pair of electrodes (102; 502) among the plurality of electrodes (102; 502), wherein each detector (104; 504) is configured to detect a signal based on input from the pair of electrodes (102; 502) and each detector (104; 504) comprises an analog-to-digital converter, which is configured to provide a digital representation of the detected signal, wherein the digital representation has a first resolution; a signal selection logic (110; 510), which is configured to receive the digital representations determined by the detectors (104; 504) and is configured to determine at least one quality measure of each of the digital representations for selecting a pair of electrodes (102; 502) for signal acquisition and output a control signal; a multiplexer (112, 122; 512, 532), which is connected to each of the plurality of electrodes (102; 502) and which is configured to select a pair of electrodes (102; 502) for signal acquisition based on the control signal from the signal selection logic (110; 510); and a signal processing unit (114, 124; 514), which is configured to receive the selected signal from the multiplexer (112, 122; 512, 532) based on the selected pair of electrodes (102; 502) and which is configured to perform analog-to-digital conversion on the selected signal and thereby to provide a digital representation of the selected signal, characterised in that the digital representation has a second resolution, which is higher than the first resolution. a plurality of electrodes (102; 502), each being configured to acquire an electrode signal; a plurality of signal quality detectors (104; 504), each signal quality detector (104; 504) being associated with at least a pair of electrodes (102; 502) among the plurality of electrodes (102; 502), wherein each detector (104; 504) is configured to detect a signal based on input from the pair of electrodes (102; 502) and each detector (104; 504) comprises an analog-to-digital converter, which is configured to provide a digital representation of the detected signal, wherein the digital representation has a first resolution; a signal selection logic (110; 510), which is configured to receive the digital representations determined by the detectors (104; 504) and is configured to determine at least one quality measure of each of the digital representations for selecting a pair of electrodes (102; 502) for signal acquisition and output a control signal; a multiplexer (112, 122; 512, 532), which is connected to each of the plurality of electrodes (102; 502) and which is configured to select a pair of electrodes (102; 502) for signal acquisition based on the control signal from the signal selection logic (110; 510); and a signal processing unit (114, 124; 514), which is configured to receive the selected signal from the multiplexer (112, 122; 512, 532) based on the selected pair of electrodes (102; 502) and which is configured to perform analog-to-digital conversion on the selected signal and thereby to provide a digital representation of the selected signal, characterised in that the digital representation has a second resolution, which is higher than the first resolution.