An apparatus includes analog-to-digital conversion (ADC)circuitry, digital processing logic, and digital-to-analogconversion (DAC) circuitry. The ADC circuitry is coupled todigitize multiple analog input signals so as to generatedigital samples. The digital processing logic is configured toextract, from the digital samples, one or more first digitalsignals corresponding to a first selected subset of the analoginput signals, and one or more second digital signalscorresponding to a second selected subset of the analog inputsignals. The digital processing logic is further configured tooutput the one or more first digital signals to a digitalmedical instrument. The DAC circuitry is coupled to convert theone or more second digital signal into one or more analogoutput signals, and to output the one or more analog outputsignals to an analog medical instrument.
